Gas generator for air bag and air bag device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an airbag gas generator for enhancing protection of a driver and an occupant, including protection against a side collision, and an airbag device using the gas generator for an automobile or the like.

【0002】

[Conventional technology]

Conventional airbag gas generators have a relatively complex structure, such as a cast housing in which an internal ignition chamber, a combustion chamber and a filter chamber are defined by an integrally formed and / or welded internal partition. Further, filters formed of coolant structures, such as heat conductive materials, often require structural complexity as described above to withstand the temperatures and pressures generated within these gas generating structures.

【0003】

Many such conventional gas generators use gas generators based on azide compounds, such as sodium azide-based materials, but they have relatively high burning rates and undesired levels of toxicity. However, it is accompanied by combustion products such as mist and ash.

【0004】

Therefore, in the prior art, there is a need for a simpler gas generator structure, for example having an internal chamber formed of a metal sheet and partially formed by an improved coolant / filter structure and burning. Utilizing non-azid gas generators that can regulate speed, amount of gas generated, internal pressure and internal temperature, increase the efficiency of airbag gas generators, while reducing size and price, and unwanted mist and Those with a reduced amount of combustion products such as ash have been desired.

【0005】

Gas generating materials based on azide compounds (eg NaN₃/ CuO) is 70kg / cm²It has a relatively high linear combustion rate of about 45 to 50 mm / sec under the pressure of. Due to this relatively high linear combustion rate, azide compound-based gas generating materials, even in the form of relatively large pellets or disc-shaped pieces with excellent shape retention performance, for example, driver airbag gas generators. When used in, it can satisfy the required characteristic of complete combustion time of 40-60 ms.

【0006】

Non-adid gas generating materials have evolved due to their superiority in terms of environmental impact and occupant safety. However, such materials generally have a linear burning rate of less than 30 mm / sec. Assuming that the linear burning rate is about 20 mm / sec and the gas generating material is produced in the form of pellets with a diameter of 2 mm or disks with a thickness of 2 mm, the burning time is about 100 ms, which is 40 ms. It cannot satisfy the desired burning time of ~ 60 ms. When the linear burning rate to obtain the desired burning time is about 20 mm / sec, the diameter of the pellets of material or the thickness of the disc needs to be about 1 mm. When the linear combustion rate is less than 10 mm / sec, the disk of gas generating material needs to have a thickness of 0.5 mm or less. Therefore, it is practically impossible to produce a gas generating material in the form of pellets or disks that are industrially stable and can withstand the vibrations of automobiles for a long time. Therefore, it has been difficult to provide an airbag gas generator that meets the desired performance requirements.

【0007】

As a conventional gas generator, there is one disclosed in Japanese Patent Application Laid-Open No. 7-47911. This is shown in FIG. In this gas generator, an upper shell 40 having a large number of gas outlets 49 on the outer peripheral wall and an outer peripheral edge of the lower shell 41 are joined by electron beam welding to form an internal accommodation space, and the central portion of the accommodation space. The ignition chamber 42 is formed in the ignition chamber 42, and the combustion chamber 43 is concentrically formed on the outer periphery of the ignition chamber 42. The squib 44 is housed in the ignition chamber 42, and the gas generating agent 45 and the filter 46 are housed in the combustion chamber 43. The cylinder 47 integrated with the upper shell 40 and the cylinder 48 integrated with the lower shell 41 are screwed and fixed to each other. The filter 46 cools the combustion gas and collects the combustion residue while the combustion gas generated by the combustion of the gas generating agent 45 passes through the filter 46. The outer peripheral surface of the filter 46 is in contact with the inner peripheral surfaces of the upper and lower shells 40 and 41.

【0008】

[Problems to be Solved by the Invention]

In the conventional gas generator, since the outer peripheral surface of the filter 46 is in contact with the inner peripheral surfaces of the upper and lower shells 40 and 41, the combustion gas entering the filter 46 proceeds toward the gas outlet 49 and is filtered. There is a risk of exiting without passing through the area A at the lower end and the area B at the upper end. Therefore, there are problems such as effective use of the filter and effective cooling / purification of the combustion gas cannot be achieved.

【0009】

As another example, the coolant of a gas generator consists of, for example, a strip of wire mesh wound in multiple cylinders, and the combustion gas is generated while the combustion gas generated in the combustion chamber of the gas generator passes therethrough. In addition to cooling the gas, it also collects relatively large combustion residues. Figure 12 shows an example of a gas generator with coolant similar to that shown in Zander et al., US Pat. No. 4,902,036. The gas generator includes a housing 231 having a gas outlet 230, an ignition means accommodating chamber 232 defined in the center of the housing 231 and a combustion defined outside the ignition means accommodating chamber 232. It has a chamber 233 and a coolant / filter chamber 234 defined outside the combustion chamber 233. An ignition means, that is, an igniter 235 and a igniter 236 are arranged in the ignition means accommodation chamber 232, and a canister 238 filled with a gas generating agent 237 ignited by the ignition means to generate gas is provided in the combustion chamber 233. The coolant / filter chamber 234 is provided with a coolant 239 that cools the combustion gas generated in the combustion chamber 233 and a filter 240 that purifies the combustion gas. The combustion chamber 233 is defined by a cup-shaped combustor cup 243 having a combustion gas outlet 244 and a central hole 245 at the bottom, and the coolant / filter chamber 234 is divided into an upper chamber and a lower chamber by a retainer 242. The filter 240 is arranged in the upper chamber, and the coolant 239 is arranged in the lower chamber.

【0010】

Then, when the sensor (not shown) detects an impact, the signal is sent to the igniter 235 to operate the igniter 235, which ignites the propellant 236 to generate a high-temperature and high-pressure flame. This flame passes through the opening 241 and breaks through the wall of the canister 238 and ignites the gas generating agent 237 inside. As a result, the gas generating agent 237 burns to generate gas, which is ejected from the ejection port 244 of the convertor cup 243, cooled while passing through the coolant 239, and a relatively large combustion residue is collected. Further, the remaining combustion residue is collected while passing through the filter 240, and the cooled and purified gas flows into the airbag (not shown) through the gas outlet 230. This causes the airbag to inflate to form a cushion between the occupant and the rigid structure, protecting the occupant from impact.

【0011】

Conventional coolants still have problems in effectively collecting fine combustion residues due to their simple void structure. Therefore, a filter is required separately from the coolant. Further, in the conventional coolant, since the pressure loss is small (the gas permeability is good), it is difficult to define a pressure chamber, for example, a combustion chamber by the coolant. Therefore, a combustion chamber defining member, for example, the above-mentioned convertor cup, conversion ring, etc. is required separately from the coolant.

【0012】

Therefore, in the conventional gas generator provided with the coolant, the number of parts is increased and the diameter of the gas generator is increased, which results in an increase in size and weight of the gas generator.

【0013】

Further, in the conventional coolant, since the bulk density (the value obtained by dividing the mass of the molded body or the like by the bulk volume) is small, it is difficult to define the pressure chamber with the coolant, and the shape retention strength of the coolant is high. It is small and therefore easily deformed when subjected to gas pressure, and the deformation of the coolant adversely affects the collection of combustion residues.

【0014】

An airbag device mounted on an automobile for the purpose of protecting an occupant from the impact of a collision is composed of a sensor, a control unit, a pad module, and the like. The pad module is attached to the steering wheel, for example, and is mainly composed of a module cover, an airbag, and a gas generator. The gas generator is a housing, an ignition means arranged in the housing, a gas generating means ignited by the ignition means to generate combustion gas, and a gas generating means arranged around the gas generating means. It is equipped with a coolant filter that cools the combustion gas and collects the combustion residue while the combustion gas passes through. Then, the ignition means is activated by the impact, which causes the gas generating means to burn and generate high-temperature and high-pressure gas. The generated gas is cooled and purified by a coolant filter, and the cooled and purified gas is ejected into the airbag (bag body). This causes the airbag to break through the module cover and form a cushion between the bulging steering wheel and the occupant to absorb the impact.

【0015】

It is an essential requirement that the pad module of the airbag device be large enough not to interfere with normal operation. Therefore, it is desirable that the gas generator included in the pad module be as small and lightweight as possible. There is a strong demand for the gas generator housing to be as thin as possible in order to achieve miniaturization and weight reduction of the gas generator.

【0016】

When the housing of the gas generator is made thin, the housing of the gas generator is deformed by the pressure of the combustion gas when the gas generator is operated, and the coolant filter in the housing comes into contact with the end face of the coolant filter. A gap is created between the inner surfaces of the housing, and there is a risk of causing a so-called short path problem in which the combustion gas escapes through the gap without passing through the coolant filter. If a short pass occurs, uncooled and unpurified gas may be ejected into the airbag and the airbag may be damaged.

【0017】

An object of the present invention is to provide a novel gas generator structure for an airbag that solves the problems of the prior art.

【0018】

Another object of the present invention is to provide an improved airbag gas generator structure using a coolant / filter that demarcates the outer boundary of the combustion chamber in a gas generator containing a gas generator.

【0019】

Another object of the present invention is to provide an improved and relatively simple airbag gas generator structure utilizing a non-azid gas generator.

【0020】

Yet another object of the present invention is an improved and relatively simple airbag gas generator structure using a non-azid gas generator and partitioning the outer boundary of the combustion chamber within the gas generator containing the non-azid gas generator. Is to provide an improved coolant / filter structure.

【0021】

Yet another object of the present invention is an improved and relatively simple airbag gas generator structure, an internal coolant / filter that partitions the outer periphery of the combustion chamber inside the outer housing of the structure and the outer housing thereof. It is to provide those that include an improved combination of structures.

【0022】

Yet another object of the present invention is to provide an airbag gas generator structure and system for drivers, occupants, and side collisions using the structures, elements and / or gas generators of the present invention. ..

【0023】

[Means for solving problems]

The gas generator for an airbag of the present invention has a housing having a plurality of gas outlets, an ignition means disposed in the housing, and a combustion gas ignited by the ignition means disposed in the housing. The filter means includes a gas generating means for generating the gas and a filter means for defining a combustion chamber accommodating the gas generating means to cool the combustion gas and collect the combustion residue, and the outer periphery of the filter means is the housing. It is arranged so as to face the inner surface of the outer peripheral wall of the above and form a gap between the two, and the gap forms a gas passage necessary for the combustion gas to pass through the entire surface of the filter means. ..

【0024】

Then, it is preferable to include a gas passage securing means for securing the gas passage when the gas generator is operated.

【0025】

One preferred embodiment of the housing is a circular portion having no machined hole, a peripheral wall portion formed on the outer peripheral portion of the circular portion and having the gas discharge port, and a radial outer side at the tip portion of the peripheral wall portion. A diffuser shell having a flange portion extending to the surface, a space formed with the diffuser shell, a circular portion, a central hole formed in the central portion of the circular portion, and a peripheral wall formed in the outer peripheral portion of the circular portion. It comprises a closure shell having a portion and a flange portion extending radially outward at the tip of the peripheral wall portion, and the ignition means is arranged in a central hole of the closure shell.

【0026】

In addition, another preferred embodiment of the housing comprises a cylindrical portion having the gas discharge port and side wall portions disposed at both ends of the cylindrical portion, and the ignition means is any of the both side wall portions. It is arranged on one side.

【0027】

The gas passage securing means preferably comprises a deterrent means for suppressing the swelling of the filter means.

【0028】

The deterrent means may be composed of a perforated cylindrical body fitted to the outer peripheral surface of the filter means, or may be composed of a wire mesh layer or a belt-shaped deterrent layer formed on the outside of the filter means.

【0029】

The gap preferably has a size of 1.0 to 4.0 mm.

【0030】

Further, it is preferable that the filter means is made of a cylindrical laminated wire mesh body, and the gas generating means is housed in the inner space of the wire mesh body.

【0031】

In this gas generator, the gap formed between the filter means and the outer peripheral wall of the housing functions as a gas passage, and the presence of this gas passage allows the combustion gas to pass through the entire area of the filter means and toward the gas passage. As a result, effective use of filter means and effective cooling / purification of combustion gas are achieved. The cooled and purified combustion gas reaches the gas outlet of the housing through the gas passage. A more preferable size of this gap is 1.0 to 3.0 mm. This gap basically means between the outer periphery of the filter means and the inner surface of the outer peripheral wall of the housing, but when the filter means is provided with the deterrent means, it means between the outer periphery of the deterrent means and the inner surface of the outer peripheral wall of the housing. ..

【0032】

The housing can consist of a diffuser shell and a closure shell. The diffuser shell and closure shell are each made of stainless steel plate with a thickness of 1.2 to 3.0 mm and can have an outer diameter of 45 to 75 mm. In this gas generator, it is preferable to have a flange at least on the diffuser shell side. Since this flange is located below the support member that fixes the pad module including the gas generator, there is no risk of harm to the airbag side, that is, the occupant side even if the welded portion is damaged. The diffuser shell and closure shell can be joined by various welding methods such as electron beam welding, laser welding, TIG welding, and projection welding. Regarding the material of the diffuser shell and the closure shell, a nickel-plated steel plate may be used instead of the stainless steel plate. The gas outlet of the diffuser shell has a diameter of 1.5 to 4.5 mm, and a total of 16 to 24 can be arranged in the circumferential direction. Further, it is preferable that the total height of the housing (the height from the upper surface of the diffuser shell to the bottom surface of the closure shell) is 25 to 40 mm.

【0033】

The gas generator for an airbag of the present invention has a housing having a plurality of gas outlets, an ignition means arranged in the housing, and a combustion gas ignited by the ignition means arranged in the housing. Between the gas generating means that generates the gas, the filter means that is arranged around the gas generating means and that cools the combustion gas and collects the combustion residue, and the end face of the filter means and the inner surface of the housing that abuts the end face thereof. The short pass preventing means for preventing the short pass of the combustion gas of the above is included.

【0034】

The short pass preventing means may be composed of a plate member including a circular portion that closes the end opening of the filter means and a peripheral wall portion that is integrally formed with the circular portion and abuts on the inner peripheral surface of the filter means. preferable.

【0035】

The plate member may have a central hole in its circular portion that fits into the outer peripheral wall of the ignition means accommodating chamber for accommodating the ignition means.

【0036】

One preferred embodiment of the housing is a circular portion having no machined hole, a peripheral wall portion formed on the outer peripheral portion of the circular portion and having the gas discharge port, and a radial outer side at the tip portion of the peripheral wall portion. A diffuser shell having a flange portion extending to the surface, a space formed with the diffuser shell, a circular portion, a central hole formed in the central portion of the circular portion, and a peripheral wall formed in the outer peripheral portion of the circular portion. It comprises a closure shell having a portion and a flange portion extending radially outward at the tip of the peripheral wall portion, and the ignition means is arranged in a central hole of the closure shell.

【0037】

In addition, another preferred embodiment of the housing comprises a cylindrical portion having the gas discharge port and side wall portions disposed at both ends of the cylindrical portion, and the ignition means is any of the both side wall portions. It is arranged on one side.

【0038】

In one preferred embodiment of the present invention, an inner peripheral surface of the housing that is inclined with respect to the central axis of the gas generator is formed between the outer peripheral wall of the housing and the filter means.

【0039】

Further, in one preferred embodiment of the present invention, at least one end face of the filter means is fixed to the inner surface of the housing by welding.

【0040】

The short pass preventing means can be made of a plate member, and the plate member is composed of a circular portion and a peripheral wall portion integrally with the circular portion. The circular portion closes the end opening of the filter means, and the peripheral wall portion abuts on the inner peripheral surface of the filter means. When the housing is deformed in the vertical direction under the pressure of the combustion gas, the circular portion also moves in the vertical direction due to the gas pressure, and at this time, the peripheral wall portion slides on the inner peripheral surface of the filter means. Alternatively, when the plate member is made of a ductile thin plate, when the housing is deformed by the pressure of combustion gas, the circular portion and the peripheral wall portion are also deformed and are in close contact with the inner surface of the housing and the inner peripheral surface of the filter means. To do. In this way, even if a gap is generated between the end surface of the filter means and the inner surface of the housing due to the deformation of the housing, the short path is prevented by the plate member.

【0041】

The plate member has a central hole in its circular portion, and the central hole can be fitted to the outer peripheral wall of the ignition means accommodating chamber accommodating the ignition means. As a result, the plate member is fixed to the outer peripheral wall, and this plate member can also function as a positioning member of the filter means.

【0042】

As the positioning means of the filter means, an inner peripheral surface of the housing inclined with respect to the central axis of the gas generator can be formed between the outer peripheral wall of the housing and the filter means. The inner peripheral surface forms a mortar-shaped surface around the filter means to prevent the filter means from moving in the radial direction.

【0043】

The plate member can be arranged at both ends of the filter means, or can be arranged at either end. When it is arranged only on one end, the end surface of the filter means on the side where the plate member is not arranged can be fixed to the inner surface of the housing by welding in order to prevent a short pass.

【0044】

The plate member can be press-molded from a stainless steel plate or steel plate having a thickness of 0.5 to 1.0 mm.

【0045】

A gap can be formed between the filter means and the outer peripheral wall of the housing, and the gap can form a gas passage around the filter means. Due to the presence of this gas passage, the combustion gas travels toward the gas passage and passes through the entire area of the filter means, whereby effective utilization of the filter means and effective cooling / purification of the combustion gas are achieved.

【0046】

The filter means can also have a double structure having a layer made of laminated wire mesh on the inside or outside thereof. The inner layer can have a filter means protection function that protects the filter means against the flame of the ignition means ejected toward the filter means and the combustion gas of the gas generating means ignited and burned by the flame. Further, the outer layer can function as a deterrent means for suppressing the swelling of the filter means so that the filter means does not bulge due to the gas pressure and close the gap when the gas generator is operated.

【0047】

The gas generator for an airbag of the present invention comprises a housing composed of a diffuser shell formed by press-molding a metal plate and having a gas discharge port, a closure shell formed by press-molding a metal plate and having a central hole, and a pipe. A central cylinder member in the housing, which is arranged concentrically with the central hole to form a hollow chamber for ignition means, and a combustion chamber for gas generating means, which is arranged so as to surround the central cylinder member, are defined and a flow rate of 100 l at room temperature. / min / cm²0.3 × 10^-2~1.5×10^-2kg / cm²It includes a coolant / filter that has a pressure loss of the above and is responsible for cooling the combustion gas and collecting the combustion residue, and introduces the gas generated in the combustion chamber by the impact into the airbag to protect the occupants from the impact. ..

【0048】

One preferred embodiment of the gas generator of the present invention includes a diffuser shell, a closure shell, a central tubular member, and coolant. These four components are manufactured separately. That is, the diffuser shell and closure shell are made by press forming a plate, the central tubular member is preferably a tube made by rolling and welding the plate into a tubular shape, and the coolant / filter is preferably a flat wire mesh. Are stacked in the radial direction and compression-molded in the radial direction and the axial direction.

【0049】

The shape of the diffuser shell is simplified by separating the central tubular portion, which was conventionally integrally formed with the circular portion of the diffuser shell. Further, by separating the central cylinder portion, the volume of the central cylinder portion can be freely changed as needed separately from the diffuser shell. The central cylinder member can be manufactured independently at low cost by using, for example, the UO press method. Such welded pipes can be UO-pressed (including the process of forming a plate into a U-shape, then O-shaped and welding the seams) or electronic resistance welding (wrapping the plate around a cylinder and applying pressure to the seams). It can be made by (including the process of welding seams with resistance heat through electric current).

【0050】

By molding the diffuser shell and the closure shell by press working, the diffuser shell and the closure shell can be easily manufactured, and the manufacturing cost can be reduced.

【0051】

Another aspect of the gas generator structure is located in the center of the housing, omitting the central cylinder by using an ignition can attached to the closure shell in the combustion chamber partitioned by the coolant / filter and housing. As used herein, a coolant / filter refers to a coolant / filter structure or apparatus for better describing the dual function of cooling and filtering the gas, preferably generated by a non-adid gas generating agent. It is a thing.

【0052】

In a preferred embodiment, the pressure loss through the coolant / filter structure is preferably a flow rate of 100 l / min / cm at room temperature.²0.5 x 10^-2~1.2×10^-2kg / cm²And. More preferably, the flow rate is 100 l / min / cm at room temperature.²0.7 × 10^-2~0.9×10^-2kg / cm²And.

【0053】

NQ / Sr (NO) is a suitable solid gas generating means for this gas generator.₃)₂There is a pellet gas generator consisting of / CMC. This is NQ (nitroguanidine) 32.4% by weight, Sr (NO)₃)₂It is a mixture of 57.6% by weight (strontium nitrate) and 10% by weight of CMC (carboxymethyl cellulose). NQ acts as fuel and Sr (NO)₃)₂Acts as an oxidant, and CMC acts as a binder.

【0054】

The solid gas generator is preferably 70 kg / cm²It has a linear combustion rate of 5 to 30 mm / sec under the pressure of 5 to 15 mm / sec, more preferably 5 to 15 mm / sec.

【0055】

The diffuser shell and closure shell are made of stainless steel plate with a thickness of 1.2 to 3.0 mm, respectively. The diffuser shell has an outer diameter of 45 to 75 mm, and the closure shell has an outer diameter of 45 to 75 mm. It is preferable that a gap of 1.0 to 4.0 mm is formed between the outer peripheral wall formed by the shell and the coolant / filter.

【0056】

The diffuser shell and closure shell can form the housing of the gas generator and can be provided with mounting flanges on at least one of them. The diffuser shell and the closure shell can be joined by various welding methods such as plasma welding, friction welding, projection welding, electron beam welding, laser welding, and TIG welding. Regarding the material of the diffuser shell and the closure shell, a nickel-plated steel plate may be used instead of the stainless steel plate. In the gap formed between the outer peripheral wall formed by the diffuser shell and the closure shell and the coolant / filter, the gas cooled and purified through the coolant / filter passes through the coolant / filter to the gas outlet of the diffuser shell. It functions as a gas flow path to reach.

【0057】

The gas outlet of the diffuser shell has a diameter of 2.0 to 5.0 mm, and a total of 12 to 24 can be arranged in the circumferential direction.

【0058】

The central cylinder member of the electrically operated gas generator consists of a tube obtained by rolling and welding a stainless steel plate having a thickness of 1.2 to 3.0 mm into a tubular shape, and can have an outer diameter of 17 to 22 mm. In a mechanically operated gas generator, the central cylinder plate has a thickness of 1.5 to 7.5 mm and an outer diameter of 19 to 30 mm.

【0059】

The central tubular member also preferably has a diameter of 1.5 to 3.0 mm and a total of 6 to 9 through holes arranged in the circumferential direction. The through holes are arranged in two rows in a staggered pattern, one row can consist of three through holes with a diameter of 1.5 mm and the other row can consist of three through holes with a diameter of 2.5 mm. The central cylinder member forms a hollow chamber for ignition means, and the hollow chamber accommodates the ignition means composed of an igniter and a gunpowder. The through hole is a hole from which the flame of this explosive is ejected. The central cylinder member has a female screw engraved on the inner peripheral portion thereof, a male screw is engraved on the outer peripheral portion of the igniter, and the ignition means is fixed to the central cylinder member by screwing the igniter into the central cylinder member. Can be done. Alternatively, the central cylinder member has a crimped portion at one end, and the ignition means can be fixed to the central cylinder member by crimping the crimped portion. In addition, it can be fixed by welding. Examples of the method of fixing the central cylinder member to the diffuser shell include friction welding, projection welding, laser welding, arc welding, and electron beam welding.

【0060】

The coolant / filter is preferably formed by stacking flat wire meshes in the radial direction and compressing them in the radial and axial directions. The coolant / filter thus formed has a complicated void structure and has an excellent collection effect. In that way, an integrated coolant / filter that has both a cooling function and a collecting function can be realized. In a preferred embodiment, the coolant / filter at room temperature and flow rate is 100 l / min / cm.²Under the conditions of 0.3 × 10^-2~1.5×10^-2kg / cm²Has a pressure loss of.

【0061】

More specifically, a flat-knit stainless steel wire mesh is formed into a cylindrical body, and one end of the cylindrical body is repeatedly bent outward to form an annular laminated body, and the laminated body is compression-molded in a mold. This allows the coolant / filter to be formed. Alternatively, a flat-knit stainless steel wire mesh is formed into a cylindrical body, the cylindrical body is pressed in the radial direction to form a plate body, and the plate body is wound in multiple cylinders to form a laminated body. A coolant / filter can also be formed by compression molding this laminate in a mold. As the stainless steel that is the material of the wire mesh, SUS304, SUS310S, SUS316 (JIS standard symbol) and the like can be used. SUS304 (18Cr-8Ni-0.06C) exhibits excellent corrosion resistance as an austenitic stainless steel.

【0062】

The coolant / filter can also have a double structure consisting of a wire mesh with a wire diameter of 0.3 to 0.5 mm and an inner layer of a wire mesh with a wire diameter of 0.5 to 0.6 mm and a thickness of 1.5 to 2.0 mm. The inner layer has a coolant / filter protection function that protects the coolant / filter against the flame of the igniter ejected toward the coolant / filter and the combustion gas of the gas generating agent ignited and burned by this flame.

【0063】

The coolant / filter can have an outer diameter of 55-65 mm, an inner diameter of 45-55 mm, and a height of 26-32 mm, i.e. a thickness of 5-10 mm. Otherwise it can have an outer diameter of 40-65 mm, an inner diameter of 30-55 mm, and a height of 19-37.6 mm. Further, it is preferable that the coolant / filter has a coolant / filter support member that prevents its movement. This coolant / filter support member has a flameproof plate portion that is arranged to face the flame through hole of the igniter drilled in the central cylinder member and covers the inner peripheral surface of the coolant / filter. This flameproof plate part has a coolant / filter protection function that protects the coolant / filter against the flame ejected toward the coolant / filter, and changes the direction of the flame so that the flame can sufficiently turn to the gas generating agent. It has a combustion promoting function. The coolant / filter support member also has a short pass prevention function for preventing a short pass of combustion gas between the inner surface of the housing and the end face of the coolant / filter. The coolant / filter support member can be formed of a stainless steel plate or steel plate having a thickness of 0.5 to 1.0 mm. Further, the flameproof plate portion may be arranged as a flameproof plate separate from the support member in contact with the inner peripheral surface of the coolant / filter or at a distance from the inner peripheral surface.

【0064】

It is preferable that the gas outlet of the diffuser shell is closed with an aluminum tape having a width of 2 to 3.5 times its diameter in order to prevent moisture from entering the housing from the outside. The application of the aluminum sealing tape can be performed by using an adhesive aluminum tape or an adhesive, preferably a hot melt adhesive which can be melted by heating to ensure adhesion.

【0065】

A cushion of gas generating agent can be arranged in the combustion chamber. The cushion is made of stainless steel wire mesh and is fixed to a support plate, which has bends on its inner and outer circumferences, and the elasticity of the bends between the central cylinder member and the coolant / filter. It is preferable to be fixed to. If the cushion is made of stainless steel wire mesh, this cushion can also function as coolant. The cushion can also be formed from silicone foam.

【0066】

The total height of the housing is preferably 30 to 35 mm.

【0067】

The coolant / filter has a predetermined wire diameter and a predetermined bulk density. The correct setting of wire diameter and bulk density can also capture the combustion residue of the combustion gas, which can sufficiently increase the shape retention strength of the coolant / filter. In this way, the coolant / filter can be reduced in thickness by preventing the coolant / filter from being deformed by the combustion pressure and ensuring the normal function of catching the combustion stain residue. This bulk density is preferably 3.5-4.5 g / cm³However, when the wire diameter is 0.3 to 0.6 mm, it is 3.0 to 5.0 g / cm.³Can be.

【0068】

Instead of metal mesh, sintered metal can be used to form coolant / filter means. Coolants / filters can also be made from metal and ceramic composites or foamed metals.

【0069】

There are several other coolant / filter aspects, but they are described in detail with the drawings.

【0070】

The present invention can also be utilized in aluminum housings as described in US Pat. No. 5,466,420. In this case, a housing having a thickness of 2 to 4 mm is formed by means other than press forming, and the diffuser shell is bonded to the closure shell by friction welding.

【0071】

The airbag gas generator of the present invention includes the following: the gas generator of the present invention as described above, the impact sensor that detects an impact and outputs the detection signal, and the gas generation that inputs the detection signal. It is an airbag device including a control unit that outputs an operation signal to the ignition means of the device, an airbag that expands by introducing gas generated by the gas generator, and a module case that houses the airbag. The present invention makes it possible to form the housing with a relatively thin material by preventing the gas from deforming the housing and, as a result, bypassing both end faces of the coolant / filter. The present invention provides a combination of a coolant / filter and a collaborative baffle that works with it to prevent a short path as described above and bypass from the coolant / filter. This will be described in more detail in the detailed description of the drawings. Without such a protective structure, unfiltered combustion residues will come out of the gas generator and damage the combined bag. All the structures provided are for driver, occupant and side collision gas generators.

【0072】

Next, the parameters of the housing suitable for the non-azido gas generator will be described.

【0073】

To accommodate the relatively slow burning rates of many non-azid gas generators (less than 30 mm / sec), and to ensure that the gas generator burns completely in the appropriate amount of time for drivers, occupants, and side collisions. Adjust the A / At ratio to ensure. A is the total surface area of the gas generator and At is the total area of the gas outlet holes in the diffuser shell of the gas generator.

【0074】

For driver airbag gas generators, the preferred amount of non-azid gas generator is on the order of 20 to 50 g. In the passenger seat (so-called passenger seat), the preferred amount of non-adid gas generating agent is more than 40 to 190 g. For side collisions, it weighs more than 10 to 25g. This combustion parameter is further enhanced by adjusting the particle size of the non-azido gas generator, which will be described in more detail below. Other parameters to adjust are the internal volume in the gas generator housing and the amount of gas generating agent, which are also detailed below.

【0075】

In addition, the optimization of gas flow is the same as the total area At of the gas discharge holes of the diffuser, with the radial (annular) cross-sectional area St of the specified gas passage or space between the coolant / filter and the end wall of the housing. It can be achieved by controlling it to be larger than or equal to. This ratio St / At is preferably in the range of 1 to 10, more preferably in the range of 2 to 5.

【0076】

In order to maintain the annular cross-sectional area of this gas passage or space, the coolant / filter is provided with an outer perforated cylindrical stiffener that defines the inner wall of the gas passage and the coolant / filter under the pressure of the generated gas. Prevents expansion into that passage. Other suitable peripheral wall support layers may also be provided for this purpose.

【0077】

The coolant / filter structure of the present invention regulates the amount of solid particles in the gas ejected from the diffuser pores to less than 2 g. Preferably, it is less than 0.7 g rather than less than 1 g.

【0078】

In addition, the ratio of the total area At of the diffuser holes to the capacity of the generated gas remains greater than the desired index, and the maximum pressure range in gas generator housings with capacities of 130 cc or less is 100 to 300 kg / cm²Depending on the size and number of Diffeser holes (70 kg / cm) to be maintained²Area At is adjusted (for non-azid gas generators with a linear combustion rate of 30 mm / sec or less under pressure). At a housing volume of 120cc, the total area of the gas outlets is preferably 1.13 cm.²Is.

【0079】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

【0080】

FIG. 1 is a cross-sectional view of the gas generator for an airbag of the present invention. The gas generator includes a housing 3 consisting of a diffuser shell 1 and a closure shell 2, a central tubular member 4 in the housing 3, and a coolant / filter 5 arranged around the central tubular member 4. There is.

【0081】

The diffuser shell 1 is formed by molding a stainless steel plate by pressing, and 20 gas discharge ports 7 having a diameter of 3 mm are arranged at equal intervals in the circumferential direction on the peripheral wall portion 6 of the diffuser shell 1 in this embodiment. The diffuser shell 1 has an inwardly recessed recess 9 in the center of the circular portion 8, and the recess 9 sandwiches the igniter container 10 together with the igniter 18 constituting the igniter. The closure shell 2 is formed by molding a stainless steel plate by pressing, and has a central hole 12 in the central portion thereof. The central cylinder member 4 is arranged concentrically with the central hole 12, and one end side end surface 34 of the central cylinder member 4 is in contact with the inner surface 35 of the closure shell. The closure shell 2 also has a mounting flange portion 14 at the tip of its peripheral wall portion 13. The diffuser shell 1 and the closure shell 2 are fitted to each other at each peripheral wall portion, laser welding 15 is performed at this fitting portion, and the two are joined to form a housing 3.

【0082】

The central cylinder member 4 is made of a stainless steel pipe with both ends open, and a female screw 32 is cut on one end side thereof. The other end side of the central cylinder member 4 is fixed to the circular portion 8 of the diffuser shell so as to surround the recess 9 by inert gas arc welding. A hollow chamber for an igniter, that is, an igniter accommodating chamber 17 for accommodating the igniter is formed inside the central cylinder member 4. The igniter comprises an igniter 18 that operates by a signal from a sensor (not shown) and a gunpowder container 10 filled with a gunpowder ignited by the igniter 18. A male screw 36 is cut on the outer peripheral surface of the igniter 18, and the male screw 36 is screwed with the female screw 32 of the central cylinder member, and the igniter 18 is screwed to the central cylinder member 4. The collar portion 37 provided in the igniter 18 has a function of preventing screws from loosening. The igniter 18 is provided with an O-ring 20 in its outer peripheral groove, and the O-ring 20 serves as a seal for the ignition means accommodating chamber 17. The central tubular member 4 also has two rows of through-hole rows 21 arranged in a staggered manner on the other end side. In the case of this embodiment, of the two rows, one row is composed of three through holes having a diameter of 1.5 mm, and the other row is composed of three through holes having a diameter of 2.5 mm.

【0083】

Some preferred parameters of the diffuser and closure shells 1 and 2 and the central tubular member 4 are as follows.

【0084】

The diffuser shell and closure shell are made of stainless steel plate with a thickness of 1.2 to 2.0 mm, respectively. The diffuser shell has an outer diameter of 65 to 70 mm, and the closure shell has an outer diameter of 65 to 75 mm. It is preferable that a gap of 1.0 to 4.0 mm is formed between the outer peripheral wall formed by the shell and the coolant / filter.

【0085】

The gas outlet of the diffuser shell has a diameter of 2.0 to 5.0 mm, and a total of 16 to 24 can be arranged in the circumferential direction.

【0086】

The central cylinder member is made of a tube obtained by rolling and welding a stainless steel plate having a thickness of 1.2 to 3.0 mm into a tubular shape, and can have an outer diameter of 17 to 20 mm.

【0087】

The central tubular member also preferably has a diameter of 1.5 to 3.0 mm and a total of 6 to 9 through holes arranged in the circumferential direction.

【0088】

These through holes are arranged in two rows in a staggered pattern, one row can consist of three through holes with a diameter of 1.5 mm and the other row can consist of three through holes with a diameter of 2.5 mm.

【0089】

Further, the central tubular member 4 preferably has different dimensions depending on the use of the electric or mechanical sensor. In the mechanical type, the thickness of the cylinder wall is 1.5 to 7.5 mm and the outer diameter is 19 to 30 mm, and in the electric type, the thickness of the cylinder wall is 1.2 to 3.0 mm and the outer diameter is 17 to 22 mm.

【0090】

The coolant / filter 5 is arranged so as to surround the central cylinder member 4, and together with the housing, defines an annular chamber, that is, a combustion chamber 22 for gas generating means around the central cylinder member 4. This coolant / filter 5 is made by stacking stainless steel flat braided wire mesh in the radial direction and compressing it in the radial and axial directions, and is 3.0 to 5.0 g / cm.³Has a bulk density. A preferred molding method for this coolant / filter 5 will be described with reference to the drawings. First, a stainless steel wire having a wire diameter of 0.3 to 0.6 mm is flat-knitted to form a cylindrical body 60 as shown in FIG. Next, one end 61 of the cylindrical body 60 is bent outward as shown in FIG. 3, and this is repeatedly bent to form an annular laminated body 62. The number of bends is determined in consideration of the wire diameter of the wire and the thickness of the coolant. Finally, this laminate 62 is placed in a mold (not shown) and has a bulk density of 3.0 to 5.0 g / cm.³The coolant / filter 5 as shown in FIG. 4 is obtained by compressing in the mold in the radial and axial directions so as to be.

【0091】

The coolant / filter of the present invention is formed by stacking a flat wire mesh having a wire diameter of 0.3 to 0.6 mm in a tubular shape in the radial direction and compression molding in the radial direction and the axial direction. This coolant / filter, which is formed by laminating wire mesh having such a stitch structure in the radial direction and compression molding, has a complicated void structure and has an excellent collecting effect. Therefore, the present coolant / filter can have a collecting function as a filter in addition to the original cooling function, and according to the present invention, therefore, a coolant / filter having both a cooling function and a collecting function. Body type coolant / filter can be realized.

【0092】

Another molding method for the coolant / filter 5 will be described with reference to FIGS. 5 and 6. After forming the cylindrical body 60 as shown in FIG. 2, the cylindrical body 60 is pressed in the radial direction to form the plate body 64 as shown in FIG. As shown in FIG. 6, this plate body 64 is wound in multiple cylinders to form a laminated body 65, and the laminated body 65 is compressed in the radial direction and the axial direction in the mold to form the coolant 5. it can.

【0093】

The coolant / filter 5 thus formed has a shape 63 in which loop-shaped stitches are crushed in each layer, and the layers are formed in the radial direction. Therefore, the void structure of the coolant becomes complicated, and this coolant has an excellent collecting effect.

【0094】

As shown in FIG. 11, the flat knitting is formed by knitting a metal wire, and all the stitches are pulled out in one direction to form a loop, and have a void structure.

【0095】

Using the above molding method, the flow rate is 100 l / min / cm at room temperature.²0.3 × 10^-2~1.5×10^-2kg / cm²This coolant / filter can be compression molded to have a pressure loss of.

【0096】

A double-structured coolant can be produced by inserting another laminate inside the laminate 65 and compression molding. Another laminate can consist of, for example, a plate 64 as shown in FIG. 5 made of a wire mesh having a wire diameter of 0.5 mm, which is wound about twice as shown in FIG.

【0097】

This coolant / filter 5 has a function of defining a combustion chamber 22, cooling the combustion gas generated in the combustion chamber, and collecting the combustion residue. The ring body 23 is mounted on the outside of the coolant / filter 5 and has many passage holes on the entire peripheral wall to reinforce the coolant / filter 5. These are shown in Figure 1.

【0098】

Further describing FIG. 1, an inclined portion 67 is formed in the circumferential direction so as to surround the circular portion 8 of the diffuser shell. Further, an inclined portion 69 is similarly formed in the circumferential direction so as to surround the annular portion 68 of the closure shell. These inclined portions 67 and 69 function as means for preventing the movement of the coolant / filter 5, and also function as a means for forming a gap between the outer peripheral walls 6 and 13 of the housing and the ring body 23 of the coolant / filter. ing.

【0099】

A pellet-shaped gas generating agent 25 and a cushion 26 of the gas generating agent 25 are arranged in the combustion chamber 22. The ring-shaped cushion 26 is formed of stainless steel wire mesh and is fixed to the support plate 24. This cushion 26 also serves as a coolant. The ring-shaped support plate 24 is made of a stainless steel plate, and has a bent portion 66 on the inner peripheral portion and the outer peripheral portion thereof, and is fixed between the central cylinder member 4 and the coolant 5 by the elasticity of the bent portion 66.

【0100】

A gap is formed between the outer peripheral walls 6 and 13 of the housing and the ring body 23 of the coolant / filter. In this gap 28, the gas that has passed through the coolant / filter 5 and is cooled and purified is the gas of the diffuser shell. It functions as a gas flow path leading to the discharge port 7. Further, in order to prevent environmental moisture from entering the housing 3, the gas discharge port 7 of the diffuser shell is blocked by the aluminum sealing tape 29.

【0101】

In this gas generator configured in this way, when a sensor (not shown) detects an impact, the signal is sent to the igniter 18 to operate the igniter 18, thereby transmitting the powder in the explosive charge container 10. The gunpowder ignites and produces a hot flame. This flame is ejected from the through hole row 21 and ignites the gas generating agent 25 in the combustion chamber 22. As a result, the gas generating agent burns to generate high-temperature and high-pressure gas, and this combustion gas is cooled by the cushion 26 and the combustion residue is collected, and further cooled while passing through the coolant / filter 5 and the combustion residue. Is collected. The cooled and purified combustion gas passes through the through hole of the perforated ring body 23, passes through the gap 28, breaks through the wall of the aluminum sealing tape 29, and is ejected from the gas outlet 7, inside the airbag (not shown). Inflow to. This causes the airbag to inflate to form a cushion between the occupant and the rigid structure, protecting the occupant from impact.

【0102】

FIG. 8 shows an example of an airbag device having the gas generator of the present invention. This airbag device consists of a gas generator 80, an impact sensor 81, a control unit 82, a module case 83, and an airbag 84.

【0103】

As the gas generator 80, the gas generator described with reference to FIG. 1 is used.

【0104】

The impact sensor 81 can consist of, for example, a semiconductor accelerometer. In this semiconductor type acceleration sensor, four semiconductor strain gauges are formed on a beam of a silicon substrate that bends when acceleration is applied, and these semiconductor strain gauges are bridge-connected. When acceleration is applied, the beam bends and strain is generated on the surface. The resistance of the semiconductor strain gauge changes due to this strain, and the resistance change is detected as a voltage signal proportional to the acceleration.

【0105】

The control unit 82 includes an ignition determination circuit, and a signal from the semiconductor type acceleration sensor is input to the ignition determination circuit. When the impact signal from the sensor exceeds a certain value, the control unit 82 starts the calculation, and when the calculation result exceeds a certain value, the operation signal is output to the igniter 18 of the gas generator 80.

【0106】

The module case 83 is made of, for example, polyurethane and includes a module cover 85. The airbag 84 and the gas generator 80 are housed in the module case 83 to form a pad module, and the pad module is attached to the steering wheel 87 of an automobile.

【0107】

The airbag 84 is made of nylon (for example, nylon 66), polyester, or the like, and the bag opening 86 surrounds the gas discharge port 7 of the gas generator and is fixed to the flange portion 14 of the gas generator in a folded state. ing.

【0108】

When the semiconductor accelerometer 81 detects an impact during a vehicle collision, the signal is sent to the control unit 82, and when the impact signal from the sensor exceeds a certain value, the control unit 82 starts calculation and the calculation result. When a certain value is exceeded, an operation signal is output to the igniter 18 of the gas generator 80. As a result, the igniter 18 operates to ignite the gas generating agent, and the gas generating agent burns to generate gas. This gas is ejected into the airbag 84, which causes the airbag to break through the module cover 85 and bulge, forming a shock-absorbing cushion between the steering wheel 87 and the occupant.

【0109】

FIG. 7 shows another example of the gas generator of the present invention. This gas generator differs in the shape of the diffuser shell and closure shell from those in Figure 1. That is, the diffuser shell 1'and the closure shell 2'have flange portions 30 and 31, respectively, and these flange portions 30 and 31 are overlapped and welded. Further, the closure shell 2'has a bent portion 72 in which the edge of the central hole is bent in the axial direction, and the central hole 12'is formed by the inner peripheral surface of the bent portion 72. Further, the diffuser shell 1'has a dish-shaped circular portion 8'due to the configuration of the inclined portion 70 extending in the circumferential direction, and this dish-shaped circular portion 8'fulfills the function of positioning the central tubular member 4'. ..

【0110】

One end of the central tubular member 4'projects to the outside of the closure shell 2', and a crimped portion 16 is formed at the protruding end. An outward flange 33 is formed on the other end side, and the outward flange 33 is brought into contact with the bottom of the dish-shaped circular portion 8'of the diffuser shell, and a projection is formed between the outward flange 33 and the circular portion 8'. Welded and the central tubular member 4'is fixed to the diffuser shell 1'. The central tubular member 4'also has a row of through hole rows 21'on the other end side. In the case of this embodiment, six through holes having a diameter of 2.5 mm are arranged in the circumferential direction. The through-hole row 21'is closed by the aluminum tape 74, and the central tubular member 4'is directly filled with the explosive agent 75. After the central tubular member 4'is positioned at its bottom by the countersunk circular portion 8'and fixed to the diffuser shell 1', the central hole 12'of the closure shell is inserted through the central tubular member 4'and then with the closure shell. The diffuser shell and closure shell are joined to the central cylinder member. The ring-shaped plate member 76, which is elastically fitted to the central cylinder member 4', functions as a welding protection plate. A step 71 for the igniter 18'is formed on one end side of the central cylinder member 4'. The igniter 18'is inserted into the central cylinder member 4'and locked to the step portion 71 after being filled with the explosive charge 75. After that, it is fixed to the housing 3'by crimping the crimped portion 16 of the central cylinder member.

【0111】

The coolant / filter 5'has a coolant / filter support member 38 that prevents its movement. The coolant / filter support member 38 is formed by press-molding a stainless steel plate having a thickness of about 1 mm, and is arranged around the outward flange 33 of the central cylinder member and abuts on the inclined portion 70, and the annular portion 39 and the annular portion 39. It has a flameproof plate portion 60 that bends against the other. The flameproof plate portion 60 is arranged to face the flame through hole of the ignition means drilled in the central cylinder member, that is, the through hole row 21', and covers the inner peripheral surface 61 of the coolant / filter 5'. There is. The flameproof plate portion 60 has a coolant protection function that protects the coolant against the flame ejected toward the coolant / filter 5', and combustion that changes the direction of the flame so that the flame sufficiently turns to the gas generating agent. It has a promoting function. As a means for preventing the movement of the coolant / filter, in addition to the inclined portions 67 and 69 (FIG. 1) and the coolant / filter support member 38, the upper and lower corners 73 of the housing or one of the corners 73 may be inside. A protrusion may be formed to project to abut the coolant 5', thereby blocking the movement of the coolant / filter 5'. Further, the porous ring body 23 provided in the coolant / filter 5 of FIG. 1 is not always necessary, and in the case of the coolant / filter 5'of this embodiment, such a thing is not provided.

【0112】

In this gas generator configured in this way, when a sensor (not shown) detects an impact, the signal is sent to the igniter 18'to activate the igniter 18', which ignites the propellant 75. To generate a high temperature flame. This flame breaks through the wall of the aluminum tape 74 and erupts from the through hole row 21'and enters the combustion chamber 22' defined by the coolant / filter 5'. The flame entering the combustion chamber 22'ignites the gas generating agent 25'near the through hole row 21', and the flameproof plate portion 60 bends the course to ignite the gas generating agent in the lower part of the combustion chamber. As a result, the gas generator burns to generate a high-temperature, high-pressure gas, and this combustion gas passes through the coolant / filter 5', is cooled while passing through the coolant / filter 5', and the combustion residue is collected. The cooled and purified combustion gas flows into the airbag (not shown) through the gas flow path 28', the gas discharge port 7', and so on. This inflates the airbag and forms a cushion between the occupant and the rigid structure to protect the occupant from impact.

【0113】

FIG. 10 shows an example of applying an example of the coolant / filter of the present invention to an airbag gas generator. The gas generator includes a housing 113 composed of a diffuser shell 111 and a closure shell 112, a central cylinder member 114 arranged in a central portion of the housing 113, and a coolant arranged surrounding the central cylinder member 114. / Contains filter 104.

【0114】

The diffuser shell 111 is formed by molding a stainless steel plate by pressing, and a plurality of gas discharge ports 107 are arranged at equal intervals in the circumferential direction on the peripheral wall portion 106 thereof. The diffuser shell 111 also has a dish-shaped circular portion 108 due to the configuration of the inclined portion 70 extending in the circumferential direction, and the dish-shaped circular portion 108 serves a function of positioning the central tubular member 114. The closure shell 112 is formed by molding a stainless steel plate by pressing, and has a hole in the center thereof, and the hole edge of the hole is bent outward in the axial direction to form a bent portion 172. The central hole 115 is formed by the inner peripheral surface of the portion 172.

【0115】

The central cylinder member 114 is made of a stainless steel pipe, one end of which protrudes to the outside of the closure shell 112, and a crimped portion 116 is formed at the protruding end. An outward flange 133 is formed on the other end side, and the outward flange 133 is brought into contact with the bottom of the dish-shaped circular portion 108 of the diffuser shell, and projection welding is performed between the outward flange 133 and the circular portion 108. The central tubular member 114 is fixed to the diffuser shell 111. The central tubular member 114 also has one row of through-hole rows 121 on the other end side.

【0116】

An ignition means accommodating chamber 117 for accommodating the ignition means is formed inside the central cylinder member 114. The ignition means includes an igniter 118 that is activated by a signal from a sensor (not shown) and a gunpowder 175 that is ignited by the igniter 118. The through-hole row 121 is closed with aluminum sealing tape 174, and the central tubular member 114 is directly filled with the explosive 175.

【0117】

After the central tubular member 114 is positioned at the bottom of the dish-shaped circular portion 108 and fixed to the diffuser shell 111, the central hole 115 of the closure shell is inserted through the central tubular member 114, and the flange portion 130 of the diffuser shell and the closure shell are inserted. The flange portion 131 of the above is overlapped, and then the closure shell and the diffuser shell, and the closure shell and the central cylinder member are joined. The ring-shaped plate member 176, which is elastically fitted to the central cylinder member 114, functions as a welding protection plate. A step portion 171 for the igniter 118 is formed on one end side of the central cylinder member 114, and the igniter 118 is inserted into the central cylinder member 114 and locked to the step portion 171 after being filled with the gunpowder 175. Will be done. After that, it is fixed to the housing 113 by crimping the crimped portion 116 of the central cylinder member.

【0118】

The coolant / filter 104 is arranged so as to surround the central cylinder member 114, and together with the housing 113, defines an annular chamber, that is, a combustion chamber 122, around the central cylinder member 114. The combustion chamber 122 is filled with a pellet-shaped gas generating agent 125. The coolant / filter 104 includes a coolant / filter support member 138 that prevents its movement. The coolant / filter support member 138 is formed by press-molding a stainless steel plate, is arranged so as to surround the outward flange 133 of the central cylinder member, and bends with respect to the annular portion 139 that abuts on the inclined portion 170 and the annular portion 139. It has a flameproof plate portion 160. The flameproof plate portion 160 is arranged to face the through hole row 121 and covers the inner peripheral surface 161 of the coolant / filter 104. The flameproof plate portion 160 protects the coolant / filter against the flame ejected toward the coolant / filter 104, and changes the direction of the flame so that the flame sufficiently turns to the gas generating agent.

【0119】

A gap 128 is formed between the outer peripheral walls 106 and 109 of the housing and the coolant / filter 104. In this gap 128, the gas that has passed through the coolant / filter 104 and is cooled and purified is discharged from the diffuser shell. Functions as a gas flow path to 107. Further, in order to prevent moisture from entering the housing 113 from the outside, the gas discharge port 107 of the diffuser shell is blocked by the aluminum tape 129.

【0120】

In the gas generator configured in this way, when a sensor (not shown) senses an impact, the signal is sent to the igniter 118 to activate the igniter 118, which ignites the propellant 175 and causes a high temperature. Generate a flame of. This flame breaks through the wall of the aluminum tape 174 and erupts from the through-hole row 121 and enters the combustion chamber 122 defined by the coolant / filter 104. The flame entering the combustion chamber 122 ignites the gas generating agent 125 near the through-hole row 121, and the flameproof plate portion 160 bends the course to ignite the gas generating agent in the lower part of the combustion chamber. As a result, the gas generator burns to generate high-temperature and high-pressure gas. The coolant / filter 104 acts to maintain the pressure of the combustion gas generated in the combustion chamber at a value desirable for the normal combustion of the gas generating agent. This combustion gas passes through the coolant / filter 104, and during that time, it is cooled by the cooling function of the coolant / filter, and the combustion residue is collected by the collecting function of the coolant / filter. It flows into an airbag (not shown) through a gas flow path 128, a gas discharge port 107, and so on. This inflates the airbag and forms a cushion between the occupant and the rigid structure to protect the occupant from impact.

【0121】

FIG. 13 is a partially enlarged view of a diagram similar to FIG. 10 in which another example of the coolant / filter of the present invention is applied to an airbag gas generator.

【0122】

The coolant / filter 104'is arranged around the gas generating agent 125 and defines an annular chamber, that is, a combustion chamber 122, around the central tubular member 114. The coolant / filter 104'is formed by stacking stainless steel flat knitted wire mesh in the radial direction and compressing the wire mesh in the radial direction and the axial direction. The coolant / filter 104'is shaped like a crushed looped stitch in each layer, which forms a layer in the radial direction. Therefore, the void structure of the coolant / filter becomes complicated, and this coolant has an excellent collecting effect. An outer layer 129 made of laminated wire mesh is formed on the outside of the coolant / filter 104'. The outer layer 129 functions as a deterrent means for suppressing the swelling of the coolant / filter and cooling so that the coolant / filter 104'does not swell due to the gas pressure and block the gap 128 when the gas generator is operated. It also has a function. The coolant / filter 104'defines the combustion chamber 122, cools the combustion gas generated in the combustion chamber, and collects the combustion residue. Instead of the outer layer 129, a wire or belt means may be used to surround the coolant / filter 104'. When the wire or belt means is located at the joint portion of both flange portions, the change in the annular cross-sectional area of the gap 128 is minimized.

【0123】

The deterrent means for suppressing the swelling of the coolant / filter can be composed of a porous cylinder. Examples of perforated cylinders are shown in FIGS. 14 and 15. This porous cylinder has inner peripheral surfaces 330, 331 that fit into the outer peripheral surface of the coolant / filter, and has a large number of through holes 334, 335 that are uniformly arranged throughout the peripheral wall portions 332, 333. .. The through hole 334 is composed of a small diameter round hole, and the through hole 335 is composed of a large diameter square hole. These swelling deterrents do not affect the pressure loss of the coolant / filter 104'. That is, they have a smaller pressure drop than the coolant / filter means.

【0124】

FIG. 16 is a cross-sectional view of another example of the airbag gas generator of the present invention. This gas generator is ignited and burned by a housing 403 composed of a diffuser shell 401 and a closure shell 402, an ignition means arranged in a storage space in the housing 403, that is, an igniter 404 and a igniter 405. A gas generating means for generating gas, that is, a solid gas generating agent 406, and a filtering means that defines a combustion chamber 428 that houses the gas generating agent 406 together with the housing 403, that is, a coolant / filter 407, and the coolant / filter 407. It includes a gap 409 formed between the inner peripheral walls 408 of the housing 403.

【0125】

The diffuser shell 401 is formed by molding a stainless steel plate by pressing, and extends outward in the radial direction to the circular portion 412, the peripheral wall portion 410 formed on the outer peripheral portion of the circular portion 412, and the tip portion of the peripheral wall portion 410. It has a flange portion 419 to be formed. In this embodiment, 18 gas discharge ports 411 having a diameter of 3 mm are arranged at equal intervals in the circumferential direction on the peripheral wall portion 410. The diffuser shell 401 has a protruding circular portion 413 formed in the central portion of the circular portion 412 by a step, and the protruding circular portion 413 imparts rigidity to the housing, particularly the ceiling portion thereof, and also accommodates the housing space. The volume is increasing. A gunpowder container 453 for accommodating the gunpowder 405 is sandwiched between the protruding circular portion 413 and the igniter 404.

【0126】

The closure shell 402 is formed by molding a stainless steel plate by pressing, and has a circular portion 430, a central hole 415 formed in the central portion of the circular portion 430, and a peripheral wall portion 447 formed in the outer peripheral portion of the circular portion 430. A flange portion 420 extending outward in the radial direction is provided at the tip of the peripheral wall portion 447. The central hole 415 has an axially bent portion 414 at the edge portion thereof. The central cylinder member 416 is arranged by fitting into the central hole 415, and the end surface 417 on one end side of the central cylinder member 416 is flush with the end surface 418 of the bent portion 414.

【0127】

The diffuser shell 401 and the closure shell 402 have flange portions 419 and 420, respectively, and these flange portions 419 and 420 are overlapped to form laser welding 421, and both are joined to form a housing 403.

【0128】

Further, the flange portion 419 of the diffuser shell has a mounting portion 410A to the mounting bracket of the pad module as shown in FIG. The mounting portions 410A are arranged at 90 degree intervals in the peripheral direction and have screw holes 410B. The outline of the flange 420 on the closure shell is shown by the dotted line.

【0129】

The central cylinder member 416 is made of a stainless steel pipe with both ends open, and the other end side is fixed to the protruding circular portion 413 of the diffuser shell by electron beam welding 422. An ignition means accommodating chamber 423 is formed inside the central cylinder member 416, and an igniter 404 operated by a signal from a sensor (not shown) and the igniter 404 are ignited in the ignition means accommodating chamber 423. A igniter container 453 filled with the igniter 405 is arranged. The central cylinder member 416 has a holding member 424 for an igniter, and the holding member 424 has an inward flange portion 425 that regulates the axial movement of the igniter 404, and the inside of the central cylinder member 416 to which the igniter is fitted. It is composed of a peripheral wall portion 426 fixed to the peripheral surface and a caulking portion 427 that fixes the igniter in the axial direction between the inward flange portion 425 by caulking. The central tubular member 416 also has a through hole 454 on the other end side. In the case of this embodiment, six through holes having a diameter of 2.5 mm are arranged at equal intervals in the circumferential direction.

【0130】

The central tubular member 416 is composed of a tube obtained by rolling and welding a stainless steel plate having a thickness of 1.2 to 2.0 mm into a tubular shape, and can have an outer diameter of 17 to 20 mm. Such welded pipes are either the UO press method (the plate is formed into a U shape, then formed into an O shape, and the seams are welded) or the electric current pipe method (the plate is formed into a circular shape and pressure is applied to the seams). In addition, it can be formed by passing a large current and welding with resistance heat).

【0131】

The coolant / filter 407 is arranged so as to surround the gas generating agent 406 and defines an annular chamber, that is, a combustion chamber 428, around the central tubular member 416. The coolant / filter 407 is formed by stacking stainless steel flat knitted wire mesh in the radial direction and compressing the wire mesh in the radial direction and the axial direction. The coolant / filter 407 is shaped like a crushed looped stitch in each layer, which forms a layer in the radial direction. Therefore, the void structure of the coolant / filter becomes complicated, and this coolant / filter has an excellent collection effect. An outer layer 429 made of laminated wire mesh is formed on the outside of the coolant / filter 407. The outer layer 429 functions as a deterrent means for suppressing the swelling of the coolant / filter so that the coolant / filter 407 does not swell due to the gas pressure and block the narrow gap 409 when the gas generator is operated. The coolant / filter 407 defines the combustion chamber 428, cools the combustion gas generated in the combustion chamber, and collects the combustion residue. Instead of the outer layer 429, the coolant / filter 407 may be surrounded by a wire or belt means. When the wire or belt means is located at the joint portion of both flange portions, the change in cross-sectional area of the gas passage due to the gap is minimized.

【0132】

The deterrent means for suppressing the swelling of the coolant / filter can be configured from the perforated cylinder described above with respect to FIGS. 14 and 15.

【0133】

Further explaining FIG. 16, an inclined portion 431 is formed in the circumferential direction surrounding the circular portion 430 of the closure shell, and the inclined portion 431 functions as a movement blocking means for preventing the movement of the coolant / filter 407 and also serves as a housing. It also functions as a means of forming a gap 409 between the outer wall 408 and the coolant / filter 407.

【0134】

The combustion chamber 428 is provided with a solid gas generator 406, a movement blocking means for blocking the movement of the coolant / filter 407, that is, a coolant / filter support member 432, and a plate member 433. The gas generating agent 406 has a hollow cylindrical body, and because of this shape, combustion occurs on the outer surface and the inner surface, and has the advantage that the surface area of the entire gas generating agent does not change much as the combustion progresses. The coolant / filter support member 432 is formed integrally with the flameproof plate portion 434 which is arranged to face the flame through hole 454 of the ignition means and covers the inner peripheral surface of the coolant / filter 407 and the flameproof plate portion 434. It is composed of a circular portion 436 having a central hole 435 that fits into the central tubular member 416. The flameproof plate part 434 has a coolant / filter protection function that protects the coolant / filter against the flame ejected toward the coolant / filter 407, and changes the direction of the flame so that the flame can sufficiently rotate to the gas generating agent 406. Has a combustion promoting function. In addition, this coolant / filter support member 432 functions as a coolant / filter positioning when assembling the gas generator, and a short path of combustion gas between the inner surface 437 of the housing and the coolant / filter end surface 438 when the gas generator is operated. It also has a short path prevention function to prevent. Such a gap can be formed by the internal pressure of the combustion gas that hits the inner wall of the inflator housing. The plate member 433 has a thickness of 0.5 to 1. It is made of 0 mm stainless steel plate and is integrally formed with a central hole 439 that fits into the central cylinder member 416, a circular portion 450 that comes into contact with the filling gas generating agent and suppresses the movement of the gas generating agent, and this circular portion 450. It consists of a peripheral wall portion 451 that abuts on the inner peripheral surface of the coolant / filter 407. The plate member 433 is sandwiched between the central cylinder member 416 and the coolant / filter 407 by an elastic force to prevent a short path of combustion gas at the end surface of the coolant / filter opposite to the end surface 438. The plate member 433 also functions as a welding protection plate during welding.

【0135】

A gap 409 is formed between the outer wall 408 of the housing and the outer layer 429 of the coolant / filter. This gap 409 forms a gas passage with an annular radial cross section around the coolant / filter 407. In the case of this embodiment, the radial cross-sectional area of the gas passage is constant, but for example, the radial cross-sectional area of the gas passage increases as the coolant / filter is formed in a conical shape and approaches the gas discharge port 411. You can also do it. In this case, the radial cross-sectional area of the gas passage can take an average value. Further, instead of the inclined portion 431, a protrusion that abuts on the outer peripheral wall 408 of the housing is provided at the end of the coolant / filter 407, and the protrusion prevents the movement of the coolant / filter 407. It can also have the function of forming a gap between the outer wall 8 and the coolant / filter 407. The area St in the radial cross section of the gas passage is larger than the total At of the opening areas S of each gas discharge port 411 of the diffuser shell. Due to the presence of the gas passage around the coolant / filter, the combustion gas travels toward the gas passage and the combustion gas passes through the entire area of the coolant / filter, which enables effective use of the coolant / filter and effective cooling of the combustion gas. Purification is achieved. The cooled and purified combustion gas reaches the gas discharge port 411 of the diffuser shell through the gas passage 409.

【0136】

The aluminum tape 452 blocks the gas outlet 411 of the diffuser shell to prevent moisture from entering the housing 403 from the outside.

【0137】

In this gas generator configured in this way, when an impact is detected by a sensor (not shown), the signal is sent to the igniter 404 to activate the igniter 404, which causes transmission in the explosive charge container 453. The gunpowder 405 ignites and produces a hot flame. This flame is ejected from the through hole 454 and ignites the gas generating agent 406 near the through hole 454, and at the same time, the course is bent by the flameproof plate portion 434 to ignite the gas generating agent in the lower part of the combustion chamber. This causes the gas generator to burn to produce high temperature, high pressure gas, which passes through the entire area of the coolant / filter 407, during which it is effectively cooled and the combustion residue is collected and cooled. -The purified combustion gas passes through the gas passage (gap 409), breaks through the wall of the aluminum tape 452, is ejected from the gas outlet 411, and flows into the airbag (not shown). This inflates the airbag and forms a cushion between the occupant and the rigid structure to protect the occupant from impact.

【0138】

When assembling the gas generator of FIG. 16, the diffuser shell 401 is joined with the central cylinder member 416 and its protruding circular portion 413 at the bottom, the plate member 432 is fitted on the central cylinder member 416, and the coolant / filter 407 To position the coolant / filter 407 on the outside of the peripheral wall of the plate member 432, fill the inside of the coolant / filter with the solid gas generator 406, and dispose the plate member 433 on the gas generator 406. .. Next, the central hole 415 of the closure shell is placed on the central cylinder member 416 so that the flange portion 420 of the closure shell and the flange portion 419 of the diffuser shell overlap. The overlapped flanges are laser welded at 421 and 444 to weld the diffuser shell 401 and closure shell 402 together, and the closure shell 402 and central cylinder member 416 together. As a final step, the explosive charge container 453 and the igniter 404 are inserted into the central tubular member 416, and then the igniter holding member 412 is crimped to secure them.

【0139】

FIG. 17 is a cross-sectional view of an airbag gas generator according to another embodiment of the present invention. This gas generator consists of a housing 463 consisting of a diffuser shell 461 and a closure shell 462, an igniter 464 arranged in the accommodation space inside the housing 463, and a solid ignited by the igniter 464 to generate combustion gas. A gas generator 466, a coolant / filter 467 that defines a combustion chamber 484 that houses the gas generator 466, and a gap 469 formed between the coolant / filter 467 and the outer peripheral wall 468 of the housing 463. Includes.

【0140】

The diffuser shell 461 is formed by molding a stainless steel plate by pressing, and has a circular portion 478 and a peripheral wall portion 476 formed on the outer peripheral portion thereof. A plurality of gas discharge ports 477 are arranged at equal intervals in the circumferential direction on the peripheral wall portion 476. The diffuser shell 461 has a plurality of radial ribs 479 radially arranged in its circular portion 478. These rib-shaped bodies 479 give rigidity to the circular portion 478 of the diffuser shell, thereby preventing the circular portion 478 forming the ceiling portion of the housing from being deformed by gas pressure.

【0141】

Further, as shown in FIG. 22, these rib-shaped reinforcing bodies 479 give rigidity to the housing, particularly the diffuser shell circular portion 478 forming the ceiling portion thereof, thereby preventing the housing from being deformed by gas pressure. As shown in FIG. 22, the flange portion 486 of the diffuser shell has a mounting portion 497 to the mounting bracket of the pad module. The mounting portions 497 are arranged at 90 degree intervals in the circumferential direction of the flange portion 486, and have mounting holes 476B for screw bolts.

【0142】

The closure shell 462 is formed by molding a stainless steel plate by pressing, and has a circular portion 471 and a peripheral wall portion 472 formed on the outer peripheral portion thereof. A concave portion 473 is formed in the central portion of the circular portion 471, and a central hole 474 is formed in the central portion of the concave portion 473. The central hole 474 has an axially bent portion 475 at the edge portion thereof, and the bent portion 475 is engaged with an inner peripheral surface 481 to which the body portion 480 of the igniter is fitted and a flange portion 482 of the igniter. It has an end face 483 to stop. A relatively large sealing surface is secured on the inner peripheral surface 481 of the axially bent portion 475. In order to ensure airtightness, a sealing material can be filled between the body portion 480 of the igniter and the inner peripheral surface 481, and welding can be performed between the flange portion 482 and the end surface 483 of the igniter. The end face 483 to which the flange 482 of the igniter is locked prevents the igniter 464 from coming out due to the gas pressure in the combustion chamber 484. The recess 473 imparts rigidity to the circular portion 471 of the closure shell and positions the bottom surface 485 of the connector of the igniter inside the outer surface of the circular portion 471.

【0143】

The diffuser shell 461 has a flange portion 486 extending radially outward at the tip of the peripheral wall portion 476, and the closure shell 462 also has a flange portion 487 extending radially outward to the tip of the peripheral wall portion 472. have. These flange portions 486 and 487 are overlapped at substantially the center position in the axial direction of the housing to perform laser welding 488, and the diffuser shell 461 and the closure shell 462 are joined to each other. These flange portions 486 and 487 give rigidity to the outer peripheral wall of the housing and prevent deformation of the housing due to gas pressure.

【0144】

The igniter 464 consists of a conventional electric igniter that is actuated by a signal from a sensor (not shown). An electric igniter is preferable to a mechanical igniter because it does not include a mechanical mechanism, has a simple structure, and is compact and lightweight. This igniter 464 (output: 300 to 1500 psi in a 10 cc sealed pressure vessel) is not accompanied by something similar to the explosive charge container 453 in FIG. This is due to the good ignitability and combustibility of the gas generating agent 466.

【0145】

That is, the gas combustion agent 466 has a decomposition ignition temperature of 330 ° C or lower and a combustion temperature of 2000 ° K or higher. The gas generating agent 466 has a hollow cylindrical body, and because of this shape, combustion occurs on the outer surface and the inner surface, and has the advantage that the surface area of the entire gas generating agent does not change much as the combustion progresses.

【0146】

The coolant / filter 467 is located concentrically with the central hole 474 and defines the combustion chamber 484 with the housing 463. The coolant / filter 467 is formed by stacking stainless steel flat knitted wire mesh in the radial direction and compressing the wire mesh in the radial direction and the axial direction. The coolant / filter 467 defines the combustion chamber 484, cools the combustion gas generated in the combustion chamber, and collects the combustion residue. An outer layer 489 made of a laminated wire mesh is formed on the outside of the coolant / filter 467. This outer layer 489 reinforces the coolant / filter and prevents swelling.

【0147】

An inclined portion 490 is formed in the circumferential direction surrounding the circular portion 471 of the closure shell, and this inclined portion 490 functions as a means for preventing the positioning or movement of the coolant / filter 467, as well as the outer peripheral wall 468 of the housing and the outer peripheral wall 468. It also functions as a means of forming a gap 469 between the outer layers 489 of the coolant / filter.

【0148】

A solid gas generator 466 and a plate member 491 are arranged in the combustion chamber 484. The gas generating agent 466 is directly filled in the space of the combustion chamber and is arranged adjacent to the igniter 464 and is a circular plate member that closes the opening between one side end of the coolant / filter 467 and the shell portion 478. Its movement is regulated by Part 492. The plate member 491 has a circular portion 492 and a peripheral wall portion 493 integrated with the circular portion 492 that abuts on the inner peripheral surface of one side end of the coolant / filter 467 to cover the inner peripheral surface. There is. The plate member 491 prevents a short path of combustion gas between the one side end surface 494 of the coolant / filter and the inner surface of the diffuser shell circular portion 478. When the plate member 491 is provided to prevent short pass, the coolant / filter may be fixed to the housing only on the opposite end face 495.

【0149】

A gap 469 is formed between the outer peripheral wall 468 of the housing and the outer layer 489 of the coolant / filter, and the gap 469 forms a gas passage having an annular radial cross section around the coolant / filter 467. Similar to the gas generator shown in FIG. 16, the area in the radial cross section of the gas passage is larger than the total opening area of each gas discharge port 477 of the diffuser shell. The spacer 489 provided around the coolant / filter allows the combustion gas to pass through the entire area of the coolant / filter 467 toward the gas passage 469, thereby improving the flow uniformity and of the coolant / filter 467. Effective utilization and effective cooling and purification of combustion gas are achieved. The cooled and purified combustion gas reaches the gas outlet 477 of the diffuser shell through the gas passage 469. Aluminum tape 496 blocks the diffuser shell gas outlet 477 from the inside of the housing to prevent moisture from entering the housing 463 from the outside.

【0150】

When assembling this gas generator, the closure shell 462 is placed with the circular portion 471 of the closure shell at the bottom, and the igniter 464 is arranged in the central hole 474 thereof. Next, the coolant / filter 467 is arranged, the solid gas generating agent 466 is filled inside the coolant / filter 467, and the plate member 491 is further arranged therein. Finally, the flange portion 486 of the diffuser shell is placed over the flange portion 487 of the closure shell, laser welding 488 is performed, and the diffuser shell 461 and the closure shell 462 are joined.

【0151】

In this gas generator configured in this way, when a sensor (not shown) detects an impact, the signal is sent to the igniter 464 to operate the igniter 464, thereby generating gas in the combustion chamber 484. Ignite agent 466. As a result, the gas generator burns to generate high-temperature and high-pressure gas, and this combustion gas enters the coolant / filter 467 from the entire region of the coolant / filter 467, and is cooled and burned while passing through the coolant / filter 467. The residue is collected. The cooled and purified combustion gas passes through the gas passage formed by the gap 469, breaks through the wall of the aluminum tape 496, is ejected from the gas outlet 477, and flows into the airbag (not shown). This causes the airbag to inflate to form a cushion between the occupant and the rigid structure, protecting the occupant from impact.

【0152】

In the embodiment of FIGS. 16 and 17, the diffuser shell and the closure shell together form the housing of the airbag gas generator, and the diffuser shell and the closure shell are each made of stainless steel having a thickness of 1.2 to 3.0 mm. It is made of steel and can have an outer diameter of 45 to 75 mm, or more preferably 50 to 70 mm. The diffuser shell and closure shell can be joined by various welding methods such as electron beam welding, laser welding, TIG welding, and projection welding. Regarding the material of the diffuser shell and the closure shell, a nickel-plated steel plate may be used instead of the stainless steel plate. The gas outlet of the diffuser shell has a diameter of 1.5 to 4.5 mm, and a total of 16 to 24 can be arranged in the circumferential direction. Further, it is preferable that the total height of the housing (the height from the upper surface of the diffuser shell to the bottom surface of the closure shell) is 25 to 40 mm.

【0153】

FIG. 18 shows another example of an airbag gas generator similar to that of FIG. 16 and shows an example of casting the diffuser shell 401'and closure shell 402' using an aluminum alloy. The diffuser shell 401 has a circular portion 412 , a central tubular portion 416 formed integrally with the circular portion 412 , a peripheral wall portion 410 formed on the outer peripheral portion of the circular portion 412 , and a radial outer side at the tip portion thereof. It has a flange portion 419'extending to. Further, the closure shell 402 includes a circular portion 430 , a central hole 415 formed in the central portion thereof, a peripheral wall portion 447 formed on the outer peripheral portion of the circular portion 430 , and the peripheral wall portion 447 . It has a flange portion 420'extending radially outward at the tip portion of the. The central hole 415'fits the outer periphery of the central tubular portion 416', the flange portion 419'of the diffuser shell and the flange portion 420' of the closure shell are overlapped, laser welding is performed 421', and the diffuser shell and the closure shell are formed. Are joined to form housing 403'.

【0154】

Similar to the gas generator shown in FIG. 16, the gas generator of this embodiment is also defined by a combustion chamber 428'with coolant / filter 407'in it and a central cylinder member 416' projecting from the diffuser shell 401'. Includes ignition means containment chamber 423'. A gap 409'is provided between the coolant / filter 407' and the housing. The same members as those in FIG. 16 have the same reference numerals, and their description will be omitted.

【0155】

In the airbag gas generator shown in FIG. 18, the closure shell is laser welded to the diffuser shell to form a housing. At the same time, friction welding can also be used in place of laser welding, as disclosed in US Pat. No. 5,466,420.

【0156】

FIG. 19 shows another example of an airbag gas generator similar to that shown in FIG. 17, where the diffuser shell 461'and closure shell 462' are cast by casting using an aluminum alloy. The diffuser shell 461 has a circular portion 478 , a peripheral wall portion 476 formed on the outer peripheral portion thereof, and a flange portion 486 extending outward in the radial direction at the tip portion thereof. The closure shell 462 has a circular portion 471 , a peripheral wall portion 472 formed on the outer peripheral portion thereof, and a flange portion 487 extending radially outward at the tip portion thereof. A central hole 474'is formed in the central portion of the circular portion 471'. The body portion 480 of the igniter 464 is fitted into the central hole 474', and the flange portion 482 of the igniter 464 is locked to the inner surface 497 of the closure shell circular portion 471'. The flange portion 486'of the diffuser shell and the flange portion 487' of the closure shell are overlapped to form a laser weld 488', and the diffuser shell 461'and the closure shell 462' are joined to each other to form a housing 463'. The same members as those in FIG. 17 are designated by the same reference numerals, and the description thereof will be omitted.

【0157】

FIG. 20 is a cross-sectional view of the gas generator of the present invention suitable for the passenger seat airbag device. The gas generator of FIG. 20 has a plurality of gas outlets 500 arranged in the circumferential direction and the axial direction. It has a cylindrical portion 501 having a housing 504, and a housing 504 composed of side wall portions 502 and 503 arranged at both ends of the cylindrical portion 501. A fire transmission tube 505 is arranged in the center of the housing 504, and a large number of disc-shaped gas generating agents 506 are juxtaposed on the outer surface of the fire transmission tube 505, and further surround them to provide a coolant / filter. 507 is arranged. An ignition means composed of a gunpowder 508 and an igniter 509 is arranged on one side wall portion 502, and the ignition means is housed in a fire transmission tube 505. A fixing screw bolt 510 is fixed to the other side wall portion 503. The fire transmission tube 505 has a large number of openings 511 from which the flame of the explosive agent 508 is ejected, and these openings 511 are uniformly dispersed and bored in the tube wall of the fire transmission tube. Aluminum tape 524 is fixed to the inner surface of the housing 504 at least in the area where the discharge port 500 is bored. The aluminum tape 524 airtightly closes the discharge port 500 so that moisture outside the discharge port 500 does not enter the housing.

【0158】

A plate member 512 is arranged at the right end of the drawing of the coolant / filter 507, and a plate member 513 is arranged at the left end of the coolant / filter 507. The plate member 512 includes a circular portion 515 that closes the opening 514 at the right end of the coolant / filter 507, and a peripheral wall portion 517 that is integrally formed with the circular portion 515 and abuts on the inner peripheral surface 516 of the coolant / filter. .. The circular portion 515 has a central hole 518 that fits into the outer peripheral surface of the fire transmission tube 505. Further, the plate member 513 also has a circular portion 521, a peripheral wall portion 522, and a central hole 523, which are configured in the same manner as the plate member 512. These plate members 512 and 513 are fixed to the fire transmission tube 505 in terms of radial movement, function as a positioning means for the coolant / filter 507 when assembling the gas generator, and the coolant / filter 507 is moved by vehicle vibration or the like. It functions as a movement blocking means for preventing movement, and also functions as a short path preventing means for preventing a short path of combustion gas between the inner surface 519 of the housing and the coolant / filter end face 520 when the gas generator is activated.

【0159】

A gap 525 is formed between the cylindrical portion 501 of the housing and the coolant / filter 507. This gap 525 forms a gas passage with an annular radial cross section around the coolant / filter 507. The area St in the radial cross section of this gas passage is made larger than the total At of the opening areas S of each gas discharge port 500 in the cylindrical portion. The presence of this gap 525 allows the combustion gas to pass through the entire area of the coolant towards the gas passage, thereby achieving effective use of the coolant and effective cooling and purification of the combustion gas. The cooled and purified combustion gas reaches the gas discharge port 500 of the cylindrical portion through the gas passage.

【0160】

When the sensor senses an impact, the signal is sent to the igniter 509 to activate the igniter 509, which ignites the propellant 508 and produces a hot flame. This flame erupts from the opening 511 of the fire transmission tube 505. The ejected flame ignites the gas generating agent 506 in the opening region. As a result, the gas generating agent 506 burns to generate high-temperature and high-pressure combustion gas. This combustion gas passes through the entire area of the coolant / filter 507, during which it is effectively cooled and combustion residues are collected, and the cooled and purified combustion gas passes through the gas passage (gap 525) and aluminum. It breaks through the wall of the tape 524, ejects from the gas outlet 500, and flows into the airbag (not shown). This inflates the airbag and forms a cushion between the occupant and the rigid structure to protect the occupant from impact.

【0161】

In the gas generators of FIGS. 16 and 17, for example, when the total surface area of the solid gas generator 406 is A and the total surface area of the opening area of each gas discharge port 411 of the diffuser shell is At, the ratio of A to At. The value of A / At is A / At = 100 to 300 for 20 to 50 g of gas generating agent. By setting this surface area ratio, the combustion rate of the gas generator is adjusted to a rate suitable for the driver's airbag, and the gas generator provided in the gas generator is guaranteed to burn completely within a desired time. ..

【0162】

In the gas generator for airbags shown in FIG. 20, for example, when the total surface area of each solid gas generator 506 is A and the total surface area of the opening area of each gas discharge port 500 of the cylindrical portion is At, the gas generator. For 40 to 120 g, the value of the ratio of A to At, A / At, is set to A / At = 80 to 240. By setting this surface area ratio, the combustion speed of the gas generator is adjusted to a speed suitable for the passenger seat airbag, and the gas generator provided in the gas generator can be completely burned within a desired time. On the other hand, the appropriate ratio for side collision airbags is 250 to 3600 with 10 to 25 g of gas generating agent, despite the same structure.

【0163】

FIG. 35 shows a configuration diagram of an airbag device suitable for placement on the passenger seat side. In the airbag device shown in this figure, a gas generator 80 "and an airbag 84" suitable for a passenger seat airbag device are housed in a module case 83 ", and the gas generator 80" is further controlled. The impact sensor 81 "is connected via the unit 82". The airbag device shown in this figure is housed in a dashboard (not shown) on the passenger seat side.

【0164】

The gas generator 80 "in FIG. 35, which shows one of the preferred embodiments of the present invention, particularly indicates an electrically ignitable gas generator such as the gas generator described with reference to FIG. However, in addition, if this gas generator is a gas generator that is long in the axial direction and has gas outlets in the circumferential direction and the axial direction, the mechanical ignition type gas using a mechanical sensor is used. It may be a generator.

【0165】

The airbag 84 "is made of nylon (for example, nylon 66), polyester, or the like and is formed in a size sufficient to ensure the safety of the passenger on the passenger side. The airbag 84" is the bag mouth thereof. Is attached to the opening side of the module case 83 "and is housed in the module case 83" in a folded state.

【0166】

The module case 83 "is formed using, for example, polyurethane or the like to a size capable of accommodating at least the gas generator 80" and the airbag 84 ", and the airbag 84" is formed in the module case 83 ". A pad module is configured by accommodating the gas generator 80 ", and this pad module is installed in the dashboard on the passenger side of the automobile.

【0167】

The impact sensor 81 "and the control unit 82" in the drawings are the same as those used for the airbag device suitable for placement on the driver's side as described with reference to FIG.

【0168】

In this airbag device, the control unit 82 "starts the calculation by the signal from the shock sensor 81" that senses the shock at the time of the collision of the automobile, and the gas generator 80 "is operated according to the calculation result to burn the combustion gas. The combustion gas ejected by the operation of this gas generator 80 "flows into the airbag 84", which causes the airbag 84 "to bulge out of the module case 83" and between the dashboard and the occupants. Form a cushion that absorbs shock.

【0169】

FIG. 23 shows a mechanically ignited gas generator that uses a mechanical sensor to detect an impact, and is particularly suitable for placement on the driver's side.

【0170】

In the mechanical ignition type gas generator shown in this figure, a diffuser shell 501 having a plurality of gas outlets 511 in the circumferential direction and a closure shell 502 having a central hole 513 are joined to form a housing. Both shells can be joined by various welding methods such as plasma welding, friction welding, projection welding, electron beam welding, laser welding, and TIG welding. The inside of the housing is defined by two or more chambers by a tubular partition wall 503 arranged concentrically with the central hole 513, and the inside of the partition wall 503 is the ignition device accommodating chamber 504 and the outside is the combustion chamber 505. .. An igniter including a transmission 508 and a mechanical sensor 550 is housed in the ignition chamber 504, and the combustion chamber 505 is described based on other drawings (FIGS. 1,7,10,16). The gas generator 506, the coolant / filter 507, the coolant support member 509, the ring body 510, the plate member 512, and other members suitable for operating the gas generator are appropriately accommodated. Further, an appropriately suitable structure such as a gap 514 secured on the outside of the coolant / filter 507 can be adopted.

【0171】

In the gas generator shown in FIG. 23, the ignition device that ignites the gas generator 506 includes, for example, as shown in FIG. 24, a mechanical sensor 550 that detects an impact exclusively by a mechanical mechanism and fires a firing pin 551. It consists of a detonator 515 that ignites and burns when it is pierced by a firing pin 551 emitted from the mechanical sensor 550, and a transmission 508 that ignites and burns with the flame that the detonator 515 burns and burns the gas generator 506. can do. The ignition device in FIG. 24 is housed in the ignition device storage chamber 504 of the housing, and a detonator piece 516 that houses and fixes the detonator 515 is arranged between the explosive agent 508 and the mechanical sensor 550. The detonator piece 516 is fixed to the partition wall 503 by disposing the detonator 515 on the shaft core of the housing. The mechanical sensor 550 is arranged in the ignition device accommodating chamber 504 so that the firing pin 551, which is fired when the sensor 550 detects an impact, can pierce the detonator 515. The detonator piece 516 is provided with a through hole 517 that communicates a place where the detonator 515 is housed and a place where the explosive agent 508 is housed, and a seal is formed in one or both of the through holes 517. It can be closed by attaching tape (not shown). Further, the opening of the portion where the detonator 515 is housed can also be closed by attaching a sealing tape to prevent the detonator 515 from absorbing moisture.

【0172】

As a mechanical sensor 550 that detects an impact by the above-mentioned exclusively mechanical mechanism and fires a firing pin 551, for example, as shown in FIG. 25, a single firing pin 551 is attached to the cam surface 554 of the trigger 553 by a coil spring 552. By pressing, a recessed portion 555 adjacent to the cam surface 554 is cut out so that the trigger 553 and the firing pin 551 are disengaged, and a ball 557 is further arranged in the cylinder 556 to form the ball 557. A mechanical sensor 550 in which the arm portion 560 of the spring holder 559 pressed upward in the drawing by the coil spring 558 is locked. When the mechanical sensor 550 senses an impact, the ball 557 moves downward in the cylinder 556, and the spring holder 559 moves downward in the drawing via the arm portion 560. As a result, the trigger 553 rotates, the cam surface 554 of the trigger 553 is disengaged from the firing pin 551, and the firing pin 551 pops out through the recessed portion 555 by the force of the coil spring 552 and hits the detonator 515. ing. Since this mechanical sensor 550 requires only one piercing mechanism for the firing pin 551, the structure is simplified, and the volume and weight are reduced as compared with the mechanical sensor having two firing pins.

【0173】

FIG. 32 shows an airbag device using a mechanically ignited gas generator 380'. The airbag device shown in this figure includes a mechanical ignition type gas generator 380'described with reference to FIG. 23 and an airbag 384'in a module case 383'.

【0174】

Module case 383'is made of, for example, polyurethane and includes module cover 385'. An airbag 384'and a gas generator 380' are housed in the module case 383' to form a pad module, which is attached to the steering wheel 387' of an automobile.

【0175】

The airbag 384'is made of nylon (for example, nylon 66), polyester, etc., and its bag mouth surrounds the gas discharge port 307' of the gas generator, and in a folded state, it is attached to the flange portion 314' of the gas generator. It is fixed.

【0176】

In the case of the airbag device using the mechanical ignition type gas generator 380'as the gas generator as described above, unlike the airbag device using the electric ignition type gas generator as shown in FIG. 8, the impact Since the impact sensor that detects the above and the control unit that manages the operation of the gas generator are not required, the arrangement and wiring of these are not required. In this airbag device, the mechanical sensor 381'housed in the gas generator 380' senses the impact at the time of a vehicle collision, so that the gas generator 380' is activated and its gas discharge port 307' Combustion gas is ejected from. This gas flows into the airbag 384', which causes the airbag to break through the module cover 385' and bulge, forming a shock-absorbing cushion between the steering wheel 387' and the occupant.

【0177】

FIG. 26 shows an airbag gas generator with a perforated basket 650 between the gas generator 606 and the coolant / filter 607. In this gas generator, a diffuser shell 601 having a plurality of gas outlets 611 and a closure shell 602 having a central hole 613 are joined by various welding methods to form a housing. The inside of the housing is defined by two or more chambers by a substantially cylindrical partition wall 603 arranged concentrically with the central hole 613, and the inside of the partition wall 603 is the ignition device accommodating chamber 604 and the outside is the combustion chamber 605. An ignition device including the igniter 608 and the mechanical sensor 612 described based on other drawings (FIGS. 23 to 25) is housed in the ignition device storage chamber 604, and the combustion chamber 605 is shown in FIG. In addition to the perforated basket 650 shown in 27 and 28, the gas generator 606, coolant / filter 607, coolant support member 609, ring body described based on other drawings (FIGS. 1, 7, 10, 16). Suitable structures such as 610, plate member 616, and other suitable members for operating the gas generator are appropriately accommodated, and a gap 614 secured outside the coolant / filter 607 can be appropriately adopted.

【0178】

The perforated basket 650 has a substantially cylindrical shape, and a plurality of through holes 651 are formed in the peripheral wall surface 652 in the circumferential direction and the axial direction. The through holes 651 can be formed regularly or irregularly at predetermined intervals, and the size of the through holes 651 can be freely adjusted within a range that does not interfere with the passage of the generated gas. Can be done. The perforated basket 650 is arranged between the gas generating agent 606 and the coolant / filter 607, and is provided from the entire exposed portion of the coolant / filter 607, that is, from the flameproof plate portion 615 of the coolant support member 609. Also covers the bottom. The flameproof plate portion 615 has a height of 8 to 15 mm and extends, for example, at least 2 mm below the lowest through hole in the bulkhead to prevent flames from the through hole in the bulkhead from contacting the coolant / filter 607. .. Further, the perforated basket 650 is formed to have the same shaft core length as the coolant / filter 607 or slightly shorter than that, and is arranged outside the flameproof plate portion 615 of the coolant support member 609. It is also possible to superimpose the filter 607 and the flameproof plate portion 615 of the coolant support member 609.

【0179】

Note that FIG. 26 shows an example in which the perforated basket 650 is used for the mechanical ignition type gas generator using the mechanical sensor 612. The perforated basket 650 is shown in FIGS. 1, 7, and 10. It can also be applied to electrically ignitable gas generators such as those shown in 16, 17, and 19.

【0180】

The gas generator for an airbag shown in FIG. 29 has a diffuser shell 601'having a gas outlet 611' and a closure shell 602' having a central hole 613', similar to the gas generator for an airbag shown in FIG. The inside of the joined housing is defined by the partition 603'into two chambers, the igniter accommodating chamber 604'and the combustion chamber 605', and the inside of the igniter accommodating chamber 604'is described with reference to FIG. An igniter containing an explosive 608'and a mechanical sensor 612' is housed, and in the combustion chamber 605', in addition to the perforated baskets shown in FIGS. 30 and 31, the gas generator 606 described in other drawings. ', Coolant / filter 607', ring body 610', plate member 609', and other members suitable for operating the gas generator are appropriately accommodated. Further, a suitable structure such as the coolant / filter 607'the gap 614 secured on the outside' can be adopted as appropriate. The perforated basket 650'can be made of stainless steel, aluminum, carbon steel, etc.

【0181】

In this embodiment, the perforated basket 650'disposed between the gas generator 606'and the coolant / filter 607' is a perforated basket used in the airbag gas generator shown in FIG. The shape is different from that of the 2650, and as shown in FIGS. 30 and 31, a substantially flat circular lid 653'is integrally formed at the upper end opening of the cylindrical peripheral wall 652' in which a plurality of through holes 651' are formed. ing. The lid 653'can be shaped to be complementary to the inner surface of the circular portion 616' at the top of the housing in which the perforated basket 650'is located. In particular, in the gas generator shown in this embodiment, since the diffuser shell 601'is provided with the cylindrical partition wall 603'that defines the ignition device storage chamber 604', the perforated basket 650' The lid portion 653'is formed with an opening 654' having a size for inserting the partition wall 603'in the center thereof.

【0182】

In the perforated basket 650'in this embodiment, the through hole 651'formed in the peripheral wall 652'is removed from the portion corresponding to the radial direction of the through hole 651' formed in the partition wall 652'. It is formed. That is, the basket 650'can protect the coolant / filter 607' from the flame caused by the combustion of the explosive 608' ejected from the through hole 617' of the partition 603', and further change the direction of the flame to make the combustion chamber 605'. The through hole 651'formed in the peripheral wall 652' of the perforated basket 650' ejects from the through hole 617' of the partition 603' so that it can sufficiently turn to the gas generating agent 606 in the'. It is formed by removing the part where the flame from the combustion of the explosive 608'is hit. Desirably, the through holes 651'of the peripheral wall 652'are formed at predetermined intervals below the place where the flame due to the combustion of the explosive agent 608' is ejected. As a result, above the perforated basket 650', more specifically above where the through hole 651' is formed, from the flame from the combustion of the explosive 608'sprayed towards the coolant / filter 607'. It will have a coolant / filter protection function to protect the coolant / filter 607'and a combustion promotion function to change the direction of the flame so that the flame can sufficiently turn to the gas generating agent 606'. The size of the through hole 651'formed in the perforated basket 650'can be appropriately adjusted in the same manner as in the perforated basket shown in FIGS. 26 to 28.

【0183】

Note that FIG. 29 shows an example in which a perforated basket is used for a mechanical ignition type gas generator using the mechanical sensor 612'. This perforated basket is shown in FIGS. 1, 7, 10, It can also be applied to electrically ignited gas generators such as those shown in 16, 17 and 19.

【0184】

The airbag gas generator shown in FIG. 33 is characterized in that the coolant / filter 750 housed in the housing is formed of two or more layers. This gas generator has a partition wall 703 in a housing formed by joining a diffuser shell 701 having a gas outlet 711 and a closure shell 702 having a central hole 713. An igniter containing the igniter 708 and the mechanical sensor 715 described in FIG. 23 is housed in the igniter storage chamber 704, and the combustion chamber 705 contains the igniter as shown in FIG. In addition to the coolant / filter 750 formed by the above layers, the gas generator 706, the coolant support member 709, the ring body 710, the plate member 712, and other members suitable for operating the gas generator as described in other figures are appropriately selected. Contain. Further, an appropriately suitable structure such as a gap 714 secured on the outside of the coolant / filter 750 can be adopted.

【0185】

In the coolant / filter 750 formed of the two or more layers, for example, the inner layer 751 and the outer layer 752 that are overlapped in the radial direction can be formed with different densities or materials. When the inner layer 751 and the outer layer 752 form a coolant / filter 750 with different densities, the inner layer 751 is formed by a wire mesh having a coarse void structure, and the outer layer is formed by a wire mesh having a fine void structure. The 752 can be formed by combining the two layers in the radial direction. As the wire mesh having a fine void structure used for the inner layer 751, a wire mesh formed by compression molding an annular wire mesh laminate in a mold can be used.

【0186】

In this embodiment, FIG. 33 shows an example in which the coolant / filter having the above configuration is housed in a mechanical ignition type gas generator using the mechanical sensor 715, but in addition, FIGS. 1,7,10,16 are shown. The coolant / filter having the above configuration can also be applied to an electrically ignitable gas generator as shown in 17, 19.

【0187】

The airbag gas generator shown in FIG. 36 is similar to the gas generator shown in FIG. 26, with the perforated basket shown in FIGS. 37 and 38 between the gas generator 806 and the coolant / filter 807. It is a gas generator to which 850 is applied. However, the gas generator shown in FIG. 36 is different from the gas generator shown in FIG. 26, and uses a perforated basket 850 as an electrically ignitable gas generator.

【0188】

In this gas generator, a diffuser shell 801 having a plurality of gas outlets 811 and a closure shell 802 having a central hole 813 are joined by one of various welding methods to form a housing. The inside of the housing is defined into two chambers by a substantially cylindrical partition wall 803 arranged concentrically with the central hole 813, and the inside of the partition wall 803 is the ignition device accommodating chamber 804 and the outside is the combustion chamber 805. Then, in the igniter storage chamber 804, an igniter including the gunpowder 808 and the igniter 812 described based on other drawings is housed. In the combustion chamber 805, in addition to the perforated basket 850 as shown in FIGS. 37 and 38, gas generator 806, coolant / filter 807, coolant support member 809, ring body 810, plate member 816, and other gas generation Suitable members for operating the vessel are housed. Further, a gap 814 can be provided on the outside of the coolant / filter 807.

【0189】

The perforated basket 850 has a substantially cylindrical shape, and a plurality of through holes 851 are formed in the peripheral wall surface 852 in the circumferential direction and the axial direction. The through holes 851 can be formed regularly or irregularly at predetermined intervals, and the size of the through holes 851 can be freely adjusted within a range that does not interfere with the passage of the generated gas. Can be done. The perforated basket 850 is arranged between the gas generating agent 806 and the coolant / filter 807, and is provided from the entire exposed portion of the coolant / filter 807, that is, from the flameproof plate portion 815 of the coolant support member 809. Also covers the bottom. Further, the perforated basket 850 is formed to have the same shaft core length as the coolant / filter 807 or slightly shorter than that, and is arranged outside the flameproof plate portion 815 of the coolant support member 809. It is also possible to superimpose the filter 807 and the flameproof plate portion 815 of the coolant support member 809.

【0190】

The perforated basket 850 can also be applied to a mechanically ignited gas generator as shown in FIG.

【0191】

The airbag gas generator shown in FIG. 39 is similar to the gas generator shown in FIG. 29, with the perfo shown in FIGS. 40 and 41 between the gas generator 806'and the coolant / filter 807'. It is a gas generator to which the rated basket 850'is applied. However, the gas generator shown in FIG. 39 is different from the gas generator shown in FIG. 29, and in particular, the perforated basket 850'is used for the electrically ignitable gas generator.

【0192】

Further, this gas generator is inside a housing formed by joining a diffuser shell 801'having a gas discharge port 811' and a combustion shell 802' having a central hole 813', similar to the gas generator for an airbag shown in FIG. Is defined as two chambers, an igniter storage chamber 804'and a combustion chamber 805', with a partition 803', and the igniter storage chamber 804' is ignited with the igniter 808'described based on other drawings. An igniter including a vessel 812'is housed, and in the combustion chamber 805', in addition to the perforated basket shown in FIGS. 40 and 41, a gas generator 806', a coolant / filter 807', and a ring body 810' , Plate member 809', and other members suitable for operating the gas generator are appropriately accommodated. It is also possible to provide a gap 814'outside the coolant / filter 807'.

【0193】

In this embodiment, the perforated basket 850'disposed between the gas generator 806'and the coolant / filter 807' is a perforated basket used in the airbag gas generator shown in FIG. The shape is different from that of the 850, and as shown in FIGS. 40 and 41, a substantially flat circular lid 853'is integrally formed at the upper end opening of the cylindrical peripheral wall 852' in which a plurality of through holes 851' are formed. Has been done. The lid 853'can be shaped to be complementary to the inner surface of the circular portion 816' at the top of the housing in which the perforated basket 850'is located. In particular, in the gas generator shown in this embodiment, since the diffuser shell 801'is provided with the cylindrical partition wall 803'that defines the ignition device accommodation chamber 804', the perforated basket 850' The lid 853'is formed with an opening 854' having a size for inserting the partition wall 803'in the center thereof.

【0194】

In the perforated basket 850'in this embodiment, the through hole 851' formed in the peripheral wall 852'is removed from the portion corresponding to the radial direction of the through hole 851' formed in the partition wall 852'. It is formed. That is, the basket 850'can protect the coolant / filter 807' from the flame caused by the combustion of the explosive agent 808' ejected from the through hole 817' of the partition 803', and further change the direction of the flame to make the combustion chamber 805. The through hole 851'formed in the peripheral wall 852' of the perforated basket 850'is ejected from the through hole 817' of the partition 803' so that it can sufficiently turn to the gas generating agent 806 in the'. It is formed by removing the part where the flame from the combustion of the explosive 808'is hit. Desirably, the through holes 851'of the peripheral wall 852'are formed at predetermined intervals below the place where the flame due to the combustion of the explosive agent 808' is ejected. As a result, above the perforated basket 850', more specifically above where the through hole 851' is formed, from the flames from the combustion of the explosive 808'sprayed towards the coolant / filter 807'. It will have a coolant / filter protection function to protect the coolant / filter 807'and a combustion promotion function to change the direction of the flame so that the flame can sufficiently turn to the gas generating agent 806'. The size of the through hole 851'formed in the perforated basket 850'can be appropriately adjusted in the same manner as in the perforated baskets of FIGS. 37 and 38.

【0195】

The perforated basket 850'can also be applied to a mechanically ignited gas generator as shown in FIG. 29.

【0196】

The airbag gas generator shown in FIG. 42, like the airbag gas generator shown in FIG. 33, has the coolant / filter 750'contained in the housing formed of two or more layers. It is a feature. However, the gas generator shown in FIG. 42 is different from the gas generator shown in FIG. 33, and in particular, the electrically ignitable gas generator uses a coolant / filter 750' consisting of two or more layers.

【0197】

This gas generator has a partition 703'in the housing formed by joining a diffuser shell 701' having a gas outlet 711' and a closure shell 702' having a central hole 713', and an igniter accommodating chamber 704'. It is defined as two chambers with a combustion chamber 705', and the igniter containing the igniter 708' and the igniter 715' described based on other drawings is housed in the igniter accommodating chamber 704'and burned. In the chamber 705', in addition to the coolant / filter 750' formed of two or more layers as shown in Fig. F2, the gas generator 706', the coolant support member 709', the ring body 710', the plate member 712', Other suitable members for operating the gas generator are appropriately housed. Also, a gap 714'can be provided on the outside of the coolant / filter 750'. In the coolant / filter 750'formed by the two or more layers, for example, the inner layer 751'and the outer layer 752' that are overlapped in the radial direction can be formed with different densities or materials. When the inner layer 751'and the outer layer 752' form a coolant / filter 750' with different densities, the inner layer 751'is formed with a wire mesh having a coarse void structure, and the void structure is made finer. The outer layer 752'can be formed with and the two layers combined in the radial direction. As the wire mesh having a roughened void structure used for the inner layer 751', for example, an annular wire mesh laminate described based on other drawings (FIGS. 2 to 6) is compression-molded in a mold. Can be used.

【0198】

The perforated basket 850'can also be applied to a mechanically ignited gas generator as shown in FIG. 33.

【0199】

Next, the non-azido gas generator will be described.

【0200】

The conventional azide gas generator has a decomposition start temperature of 350 ° C and a combustion temperature of 1500K, and ignition is unstable only with a normal igniter, and even if it ignites, it is sufficient to satisfy the performance of the gas generator. It did not burn, so it was ignited with a igniter (B / KNO).₃) Was ignited, and the gas generator was ignited and burned with the energy of the gunpowder. As a gas generator for this gas generator for airbags, non-azide gas is generated as a gas generator with excellent ignitability and combustibility with a decomposition start temperature of 330 ° C or less and a combustion temperature of 2000 ° K or more. It has been found that the use of agents can eliminate the need for previously required fire-fighting agents. The decomposition start temperature is preferably 310 ° C. or lower.

【0201】

As the non-azide gas generator used in this gas generator, various conventionally proposed agents can be used. For example, nitrogen-containing organic compounds such as tetrazole, triazole, or metal salts thereof and oxygen-containing oxidizing agents such as alkali metal nitrate as main components, triaminoguanidine nitrate, carbohydrazide, nitroguanidine, etc. as fuel and nitrogen. Known sources include nitrates, chlorates, and perchlorates of alkali metals or alkaline earth metals as oxidants, all of which can be used as gas generators in the present invention. However, the present invention is not limited to these, and is appropriately selected according to the requirements of combustion rate, non-toxicity and combustion temperature. The gas generating agent is used in an appropriate shape such as a pellet shape, a wafer shape, a hollow columnar shape, a porous body, or a disk shape.

【0202】

When the gas generator is ignited by an igniter, the larger the surface area of the gas generator, the easier the ignition. Therefore, the gas generator is preferably a hollow cylinder, a porous body, or the like.

【0203】

The internal volume of the housing of the gas generator is more preferably 65 to 115 cc, but may be 60 to 130 cc. The filling weight of the solid gas generating agent is preferably 30 to 40 g for the driver's side airbag, but may be 20 to 50 g.

【0204】

Non-azide gas generator is 70Kg / cm²It has a linear combustion speed of 5 to 30 mm / sec under the pressure of, and when constructing a gas generator for automobile airbags using this gas generating agent, 40 to 60 msec for driver airbags and for passenger seats. It is necessary to burn all the gas generating agent in 50 to 80 msec for airbags and 5 to 15 msec for side collision airbags. Therefore, in order to adjust the combustion of the gas generating agent, when the total surface area of each gas generating agent is A and the total opening area of each gas outlet of the diffuser shell is At, the value of the ratio of A and At. Appropriate settings are made for A / At. That is, this ratio A / At is set as follows: 20-50 g of gas generator for driver airbags, A / At = 100-300, 40 for passenger airbags. ~ 120g of gas generator, A / At = 80 ~ 240, for side airbags, 10 ~ 25g of gas generator, A / At = 250 ~ 3600 When the A / At ratio exceeds the maximum value of each airbag, the pressure inside the gas generator for the airbag becomes excessive, resulting in the combustion rate of the gas generating material becoming too high. If the ratio is smaller than the minimum value, the pressure in the airbag gas generator does not rise sufficiently, resulting in the combustion speed becoming too low. In either case, the combustion time is out of the desired range, and an airbag gas generator with such a combustion time cannot be used.

【0205】

In order to achieve complete combustion in a desired combustion time, the thickness distance with the smallest thickness of the thick portion in one shape of the gas generating agent is preferably 0.01 to 2.5 mm, preferably 0.01 to 1.0 mm. Is even more preferable.

【0206】

[Example]

Hereinafter, using the four types of gas generating agents shown in Table 1, the gas generating agents were ignited by an igniter without using a propellant, and the results shown in Table 2 were obtained. The igniter used was a Zpp (mixture of zirconium / potassium perchlorate) with an output of 1250 psi. The composition ratio is a weight ratio. NQ is a high specific gravity nitroguanidine.

【0207】

[table 1]

<img file="JPP3229840B2_D0001.tif" />【0208】

[Table 2]

<img file="JPP3229840B2_D0002.tif" />【0209】

In Example 1 of the present invention and Example 2 of the present invention, the gas generating agent was ignited by the igniter without using the explosive.

【0210】

In Comparative Example 1, the decomposition start temperature was high and the combustion temperature was too low, so that the ignition did not occur without the explosive.

【0211】

In Comparative Example 2, although the decomposition start temperature was low, the combustion temperature was low, so that the ignition did not occur without the explosive.

【0212】

It is desirable to limit the amount of combustion particles (combustion residue) discharged with the gas from the (diffuser) outlet of the gas generator housing. This is because such particles tend to burn airbags attached to gas generators. The optimum range of particles does not exceed 2g. The combustion temperature of the gas itself is not a critical factor in preventing airbag damage.

【0213】

In the coolant / filter of the present invention, the amount of combustion residue contained in the normal amount of gas generated by the combustion of the gas generator during operation of the gas generator is 2 g or less, preferably 1 g or less, and particularly preferably 0.7 g or less. Must have a function. Here, the amount of gas generated is naturally different from the normal amount of gas generated depending on the application, but for example, in the case of a gas generator for an airbag for the driver's seat of an automobile, it is 0.5 to 1.5 mol, and for the airbag for the passenger seat. If it is a gas generator, it is 1.5 to 5 mol. In the gas generator for airbags of the present invention, the amount of combustion residue contained in the generated gas must be limited to the above-mentioned predetermined value regardless of the amount of generated gas.

【0214】

However, in this respect, the required number of moles of gas is reduced by the higher combustion temperature of the gas generated by the non-azid gas generator and the higher expansion of the gas associated with it. As a result, less gas generator is required and smaller gas generators are possible.

【0215】

The bulk density of such coolant / filter is 3.0-5.0 g / cm.³, Preferably 3.5 ~ 4.5g / cm³Is.

【0216】

As the material of the wire mesh, for example, stainless steel can be used, and as the stainless steel, for example, SUS304, SUS310S, SUS316 (JIS standard symbol) and the like can be used. SUS304 (18Cr-8Ni-0.06C) exhibits excellent corrosion resistance as an austenitic stainless steel.

【0217】

A reinforcing ring body having a large number of through holes in the entire peripheral wall can be fitted to both the outer side and / or the inner side of the filter, but this is not always necessary.

【0218】

The gas generator (inflator) of the present invention uses a non-azide nitrogen-containing organic compound. This non-azide gas generating agent is composed of at least a nitrogen-containing organic compound, an oxidizing agent, and a slag forming agent, and when the gas generating agent is a molded product having a predetermined shape, a binder can also be blended.

【0219】

Examples of the nitrogen-containing organic compound include one or more mixtures selected from the group consisting of triazole derivatives, tetrazole derivatives, guanidine derivatives, azodicarboxylic amide derivatives, and hydrazine derivatives.

【0220】

Specific examples of these are 5-oxo-1,2,4-triazole, tetrazole, 5-aminotetrazole, 5,5'-bi-1H-tetrazole, guanidine, nitroguanidine, cyanoguanidine, triaminoguanidine nitrate, nitrate. Examples thereof include guanidine, guanidine carbonate, biuret, azodicarboxylic amide, carbohydrazide, carbohydrazide nitrate complex, dihydrazide oxalate, and hydrazine nitrate complex. Of these, nitroguanidine and cyanoguanidine are preferable, and nitroguanidine is the most preferable compound because it has a small number of carbon atoms in the molecule. Nitroguanidines include acicular crystalline low specific gravity nitroguanidines and massive crystalline high specific gravity nitroguanidines, both of which can be used, but due to safety and ease of handling during production in the presence of a small amount of water, high specific gravity nitro The use of guanidine is more preferred.

【0221】

The concentration of the compound varies depending on the number of carbon elements, hydrogen elements and other oxidized elements in the molecular formula, but is usually used in the range of 25 to 60% by weight, preferably in the range of 30 to 40% by weight. .. The absolute value varies depending on the type of oxidizing agent used, but if it is greater than the theoretical amount of complete oxidation, the trace CO concentration in the generated gas will increase, and if it is below the theoretical amount of complete oxidation, the trace NOx concentration in the generated gas will increase. .. The range in which the optimum balance between the two is maintained is most preferable.

【0222】

Various oxidants can be used, but an oxidant selected from at least one nitrate containing a cation selected from an alkali metal or an alkaline earth metal is used. The amount varies depending on the type and amount of the gas-generating compound used, but is used in the range of 40 to 65% by weight, and particularly preferably in the range of 45 to 60% by weight in relation to the above CO and NOx concentrations.

【0223】

In addition, oxidizing agents such as nitrite and perchlorate, which are widely used in the air bag inflator field, can also be used, but the number of oxygen in the nitrite molecule is reduced compared to nitrate, or fine powder that is easily released to the outside of the bag. Nitrate is preferable from the viewpoint of reducing the formation of mist.

【0224】

The function of the slag forming agent is to change from liquid to solid in order to avoid releasing the oxide of alkali metal or alkaline earth metal generated by decomposition of the oxidant component in the gas generating agent composition to the outside of the inflator as mist. Change to allow the coolant / filter to better stop them in the combustion chamber. The coolant / filter captures and cools a mixture of slug-forming agent and granular residue to a particle size that does not allow the coolant / filter to pass through thereafter. It is this interaction that eliminates the demand for traditional filter structures.

【0225】

It is possible to select an optimized slag forming agent according to the difference in metal composition. Examples of this slag forming agent include naturally occurring clays mainly composed of aminosilicates such as bentonite and kaolin, artificial clays such as synthetic mica, synthetic kaolinite and synthetic smectite, and hydrous magnesium silicate minerals. A slag-forming agent selected from at least one of these can be used. Acid clay can be mentioned as a preferable slag forming agent.

【0226】

For example, the viscosity and melting point of the oxide mixture in the three-component system of calcium oxide generated from calcium nitrate, aluminum oxide and silicon oxide, which are the main components in clay, are in the range of 1350 ° C to 1550 ° C depending on their composition ratios. The viscosity changes from 3.1 poise to about 1000 poise, and the melting point changes from 1350 ° C to 1450 ° C depending on the composition. Utilizing these properties, it is possible to exhibit the slag forming ability according to the mixed composition ratio of the gas generating agent composition.

【0227】

The amount of the slag-forming agent used can be varied in the range of 1 to 20% by weight, but is preferably in the range of 3 to 7% by weight. If it is too large, the linear combustion rate will be lowered and the gas generation efficiency will be lowered, and if it is too small, the slag forming ability cannot be sufficiently exhibited.

【0228】

The binder is a component necessary for obtaining a molded body of a desired gas generating agent composition, and if it exhibits viscosity in the presence of water, a solvent, etc., and does not significantly adversely affect the combustion behavior of the composition. Any can be used. Examples of such a binder include polysaccharide derivatives such as metal salts of carboxymethyl cellulose, hydroxyethyl cellulose, cellulose acetate, cellulose propionate, cellulose acetate butyrate, nitrocellulose, and starch, but they are safe in production and easy to handle. A water-soluble binder is preferable. The metal salt of carboxymethyl cellulose, especially the sodium salt, is the most preferred example.

【0229】

The amount of the binder used can be in the range of 3 to 12% by weight, more preferably in the range of 4 to 12% by weight. In terms of quantity, the fracture strength of the molded product becomes stronger on the larger side, but the larger the amount, the greater the number of carbon elements and hydrogen elements in the composition, and the trace amount of CO gas, which is an incomplete combustion product of carbon elements. It is not preferable because the concentration of hydrogen is increased and the quality of the generated gas is deteriorated. In particular, when the amount exceeds 12% by weight, it is necessary to increase the relative abundance ratio of the oxidizing agent, and the relative ratio of the gas generating compound decreases, which makes it difficult to establish a practical inflator system.

【0230】

Furthermore, as a side effect of the sodium salt of carboxymethyl cellulose, the presence of a micro-mixed state of the molecular order of sodium nitrate generated by the metal exchange reaction with the nitrate during the production of the molded product using water causes the nitrate as an oxidant, particularly It has the effect of shifting the decomposition temperature of strontium nitrate, which has a high decomposition temperature, to a lower temperature side and improving combustibility.

【0231】

Therefore, a preferred gas generating agent composition used in carrying out the present invention is (a) Approximately 25-60% by weight, preferably 30-40% by weight of nitroguanidine (b) Approximately 40-65% by weight, preferably 45-65% by weight of oxidant (c) Approximately 1-20% by weight, preferably 3-7% by weight slag forming agent (d) Approximately 3-12% by weight, preferably 4-12% by weight binder A gas generating agent composition comprising the above, and a particularly preferable composition is (a) Approximately 30-40% by weight nitroguanidine (b) Approximately 40-65% by weight strontium nitrate (c) Approximately 3 to 7% by weight of acid clay and (d) Approximately 4-12% by weight sodium salt of carboxymethyl cellulose It is a gas generating agent composition consisting of.

【0232】

Thus, according to the present invention (a) Approximately 25-60% by weight nitroguanidine (b) Approximately 40-65% by weight of oxidizing agent (c) Approximately 1 to 20% by weight of slag forming agent (d) Approximately 3-12% by weight binder A gas generating agent molded body for an airbag is provided.

【0233】

As the nitrogen-containing organic compound, dicyandiamide is also preferably used.

【0234】

The amount of the nitrogen-containing organic compound used in the gas generating agent composition varies depending on the number and molecular weight of the elements constituting the nitrogen-containing compound used, the combination with the oxidizing agent and other additives, but the addition of the oxidizing agent and other additives. The oxygen balance in combination with the agent is most preferably near zero, but the optimum composition molded product can be obtained by adjusting the oxygen balance to the positive side or the negative side according to the above-mentioned generated concentrations of trace CO and NOx. For example, when dicyandiamide is used, the amount thereof is preferably in the range of 8 to 20% by weight.

【0235】

As the oxygen-containing oxidizing agent used in the present invention, an oxidizing agent known in the field of gas generating agent for airbags can be used, but basically, the residual component becomes a liquid or gas state, and the coolant and the cooling agent and It is preferable to use an oxidizing agent having a property of producing a refractory substance so that the thermal load on the filter agent can be reduced.

【0236】

For example, potassium nitrate is an oxidizing agent generally used in gas generators, but the main residual component during combustion is potassium oxide or potassium carbonate, and potassium oxide is potassium peroxide and metallic potassium at about 350 ° C. Further, potassium peroxide has a melting point of 763 ° C and becomes a liquid or gaseous state in the gas generator operating state, which is not preferable in consideration of the thermal load on the above-mentioned coolant and filter agent.

【0237】

Strontium nitrate is mentioned as an oxidizing agent preferably used in the present invention. The main residual component during combustion of strontium nitrate is strontium oxide with a melting point of 2430 ° C, which is almost solid even in the gas generator operating state.

【0238】

The amount of the oxidizing agent used in the present invention is not particularly limited as long as the amount of the oxidizing agent is sufficient to completely burn the nitrogen-containing organic compound, and can be appropriately changed in order to control the linear combustion rate and the calorific value. On the other hand, when strontium nitrate is used as the oxidizing agent, it is preferably 11.5 to 55% by weight.

【0239】

One of the preferred gas generating agent compositions of the present invention is 8 to 20% by weight of dicyandiamide, 11.5 to 55% by weight of strontium nitrate, 24.5 to 80% by weight of copper oxide, and 0.5 to 8% of sodium salt of carboxymethyl cellulose. The present invention contains 8 to 20% by weight of dicyandiamide, 11.5 to 55% by weight of strontium nitrate, 24.5 to 80% by weight of copper oxide, and 0.5 to 8% by weight of sodium salt of carboxymethyl cellulose. It also provides a gas generating agent composition containing.

【0240】

Nitroguanidine, Sr (NO)₃)₂, Carboxymethyl cellulose and acid clay, nitroguanidine: Sr (NO)₃)₂The non-azido solid gas generator contained in the composition weight ratio of: carboxymethyl cellulose: acid clay = 35.4: 49.6: 10: 5 is operated in the tank in the gas generator for airbags of the present invention to generate gas. .. The generated gas discharged from the gas generator is housed in a tank, and then the inside of the tank is washed with acetone to obtain a combustion residue contained in the gas discharged from the gas discharge port, and the combustion residue in the gas is obtained. The amount was measured.

【0241】

As a result, the amount of generated gas discharged from the discharge port of the gas generator was 1 mol, which contained 0.3 g of combustion residue. The airbag gas generator of the present invention for the passenger seat had a similar test, and the amount of gas generated was 4 mol, which contained 0.6 g of combustion residue. Both tests produced less than 2 g of particles, which results prevent airbag particle damage.

【0242】

In carrying out the present invention, the following additional operating parameters have been found.

【0243】

In order for the present inventors to stably burn the non-azide gas generator, the maximum pressure in the gas generator is at least 100 kg / cm.²What is needed, and the maximum internal pressure of the gas generator is 300 kg / cm²It was found that the gas generator does not become small and lightweight because the container (housing) is required to have excessive strength.

【0244】

However, it is not necessary to control the pressure with a rupture disc, etc. for such a maximum internal pressure, and in a small container (internal volume within 120 cc), the maximum internal pressure is 100 to 300 kg / cm.², Total area of opening / gas generation amount 0.50 ~ 2.50cm²It was found that if it is / mol, an output curve suitable for airbag deployment can be obtained.

【0245】

That is, in the present invention, the gas generator is housed inside the housing, and the gas is provided with a plurality of openings for controlling the combustion of the gas generator in the direction in which the gas generated from the gas generator passes through the airbag. In the generator, the total area of the opening with respect to the amount of gas generated by the gas generator is 0.50 to 2.50 cm.²/ mol, maximum internal pressure when operating gas generator is 100 ~ 300kg / cm²Provided is a gas generator for an airbag, which is characterized by the above.

【0246】

In carrying out the present invention, it is preferable that the opening has a circular equivalent diameter of 3 to 4.5 mm. Here, the circle-equivalent diameter is not the diameter but the circle-equivalent diameter because the opening may have a shape that can be approximated to a circle as well as a circle. This is the diameter when a perfect circle has the same area as each opening. If the equivalent circle diameter of the opening is less than 2 mm, the total area of the opening / gas generation amount is 2.50 cm.²Even if it is less than / mol, airbag parts existing at the outlet of the opening, for example, an airbag if the opening is the gas outlet of the diffuser of the housing, and a filter if the opening is the partition wall of the combustion chamber inside the housing. Damage the coolant, etc. Further, if the number of openings is increased to prevent this, the number of holes becomes too large, which increases the processing cost.

【0247】

In the present invention, a small container with an internal volume of 120 cc or less has a maximum internal pressure of 100 to 300 kg / cm.², Preferably 130-180kg / cm², Total opening area / gas generation amount 0.50 ~ 2.50cm²/ mol, preferably 1.00 to 1.50 cm²A non-azide gas generating agent is selected so as to be controlled to / mol, and the pore size and number of openings are determined. This makes it possible to obtain an output curve suitable for airbag deployment. The total area of the openings is determined by (1 hole area) x (number). Therefore, considering the damage to the bag, the hole diameter is determined, and therefore the number is also determined.

【0248】

In the gas generator of the present invention, a gas generator is housed therein, and a plurality of openings for controlling the combustion of the gas generator in the direction in which the gas from the gas generator passes are provided in the housing of the generator and the plurality of openings for controlling the combustion of the gas generator. / Alternatively, it may be formed on a partition wall in the housing (hereinafter, simply referred to as a partition wall in the housing) in the direction in which the gas generated from the gas generator passes through the airbag. The opening has a size corresponding to a circular area having an inner diameter of 3 to 4.5 mm, and is either a housing, a partition wall in the housing, or both the housing and the partition wall in the housing. In addition, it is desirable that a total of 12 to 20 pieces are formed in the circumferential direction. In the present invention, the maximum internal pressure during operation in the gas generator is regulated by an opening provided in either the housing or a partition wall in the housing, or an opening provided in both the housing and the partition wall in the housing. To. For example, when openings are provided in both the housing and the partition wall in the housing, and the internal pressure of the housing is regulated by either the opening of the housing or the partition wall in the housing, the other opening further regulates the internal pressure. It can be formed as appropriate within a range that does not mean that.

【0249】

The openings through which the generated gas passes can be arranged in a row or in a staggered manner in the circumferential direction of the housing and / or the partition wall in the housing.

【0250】

The housing is formed by casting and forging, and a diffuser shell having an opening for discharging gas (hereinafter referred to as a gas discharge port) and a closure shell having a central hole are press-molded, and these are variously formed. It can be formed by welding by a welding method such as plasma welding, friction welding, projection welding, electron beam welding, laser welding, and tig welding. The housing has a gas outlet. The press-formed housing can be easily manufactured and the manufacturing cost can be reduced. The diffuser shell and the closure shell can be formed, for example, by using stainless steel plates having a thickness of 1.2 to 2.0 mm, respectively, with the outer diameter of the diffuser shell being 65 to 70 mm and the outer diameter of the closure shell being 65 to 75 mm. Instead of the stainless steel plate, a steel plate plated with nickel may be used. It is preferable to form a mounting flange on the housing and to form a gap of 1.0 to 4.0 mm that functions as a gas flow path between the outer peripheral wall of the housing and the coolant. The total height of the housing is preferably 30 to 35 mm.

【0251】

The partition wall divides the inside of the housing into two or more chambers, and is appropriately formed in the housing as needed. However, in the present invention, the partition wall provided with a plurality of openings for controlling the combustion of the gas generating agent is a partition wall in the direction in which the gas generated in the combustion chamber of the gas generating agent passes. Such partition walls include, for example, a partition wall arranged between the gas generating agent storage chamber in the housing and the coolant / filter, as well as a combustion ring. This conversion ring is arranged in a housing so as to surround the combustion chamber, and a large number of openings for controlling the maximum internal pressure during combustion of the gas generating agent are provided on the peripheral wall thereof.

【0252】

The partition wall may be a partition wall in which a tubular member is housed in the housing and the peripheral wall thereof is used as the partition wall. The tubular member can be formed, for example, by using a welded pipe obtained by rolling and welding a stainless steel plate having a thickness of 1.2 to 2.0 mm into a tubular shape. Even when a tubular member is used to form a partition wall, an opening is formed in the tubular member.

【0253】

When it is necessary to prevent the ingress of outside air (moisture), it is desirable to attach a sealing tape having a width of 2 to 3.5 times the hole diameter to the above opening. This sealing tape closes the opening exclusively for the purpose of preventing moisture, does not cause any obstacle when the generated gas passes through the opening, and does not regulate the internal pressure of the housing at all. Therefore, in the present invention, it is sufficient that the thickness of the sealing tape is sufficient to prevent the ingress of moisture. For example, when an aluminum tape is used as the sealing tape, the thickness of the tape is sufficient. By setting the size to 25 μm or more, it is possible to prevent the ingress of moisture from the tape surface. However, in the present invention, the maximum internal pressure in the housing is regulated exclusively by the total area of the openings in order to quickly start up the gas generator. Therefore, when the thickness of the aluminum tape is 80 μm or more, the gas generator Even if the ejected gas is generated by the combustion of the air bag, the aluminum tape is hard to burst and it takes time for the aluminum tape to burst, so the start-up operation of the airbag device is delayed and the intended purpose is achieved. It may not be possible. Therefore, when aluminum tape is used as a sealing tape, the tape thickness is preferably 25 to 80 μm.

【0254】

[Effect of the invention]

In the gas generator of the present invention, the coolant / filter is preferably formed with a swelling suppressing means on the outer peripheral portion, and a gap is secured between the filter of the gas generator and the housing when the gas generator is operated. By retaining a void between the coolant / filter and the housing, the combustion gas passes through the entire area of the coolant / filter structure, achieving effective use of the coolant / filter and effective cooling and purification of the combustion gas.

【0255】

Since the gas generator of the present invention is configured as described above, the combustion gas passes through the entire region of the coolant / filter structure, whereby the effective use of the coolant / filter and the effect of the combustion gas are achieved. Cooling and purification is achieved.

【0256】

Further, the gas generator of the present invention includes the short-pass preventing means configured as described above, whereby the short-pass of the combustion gas is always prevented, and all the combustion gas passes through the filter means. The more effectively cooled and purified combustion gas is always obtained, thus ensuring the normal deployment of the airbag at all times.

【0257】

In the gas generator of the present invention, the outer shell container is molded by press working, which can be manufactured inexpensively and easily, while avoiding molding by costly forging, which is advantageous in terms of cost and manufacturing. .. That is, by molding the diffuser shell and the closure shell by pressing, the manufacturing cost can be reduced and the diffuser shell and the closure shell can be easily manufactured.

【0258】

The shape of the diffuser shell is simplified by separating the central tubular member, which was conventionally integrally formed with the circular portion of the diffuser shell. Further, by separating the central cylinder member, the volume of the central cylinder member can be freely changed as needed separately from the diffuser shell. The central cylinder member can be manufactured independently at low cost by using, for example, the UO press method.

【0259】

The coolant / filter provided in this gas generator has the function of defining the combustion chamber and the function of collecting combustion residue in addition to the original cooling function, so it was provided separately from the conventional coolant. The combustion chamber partition member and the filter can be abolished. As a result, the number of parts is reduced and the diameter of the gas generator is reduced, and as a result, a compact and lightweight gas generator can be realized.

【0260】

In the airbag device equipped with this gas generator, the number of parts of the gas generator is reduced and the diameter of the gas generator is reduced, so that a compact and lightweight airbag device can be realized.

【0261】

Since the coolant / filter structure of the present invention is configured as described above, even fine combustion residues can be effectively collected. That is, since this coolant / filter has an excellent collecting function in addition to the original cooling function, it is possible to eliminate the filter that was conventionally required separately from the coolant.

【0262】

Therefore, in the gas generator provided with the coolant / filter device of the present invention, the number of parts is reduced and the diameter of the gas generator is reduced, and as a result, the gas generator can be made smaller and lighter.

【0263】

The coolant / filter device having a predetermined bulk density has a significantly increased shape retention strength, which avoids deformation due to gas pressure, thus ensuring the normal combustion residue collection function of the coolant and / or filter device. , And its thinning is achieved.

【0264】

The perforated basket protects the surface of the coolant / filter from melting without affecting the pressure in the inflator. In addition, the perforated basket prevents direct contact of the coolant / filter and gas generator pellets and also prevents the generator from rubbing against the coolant / filter due to vibration.

【0265】

The flame prevention member or flame prevention plate of the perforated basket is arranged so as to face the row of through holes in the separation plate, and shields the inner peripheral surface of the coolant / filter from the flame ejected toward the coolant / filter. Further, the ejected flame is biased so that the flame sufficiently reaches the gas generating agent. Further, by forming the flame-preventing portion and the perforated portion as one unit, the manufacturing process can be reduced and the element for connecting the perforated portion to the flame-preventing portion can be removed.

【0266】

The gas generator of the present invention can eliminate the conventionally required explosive, and the diameter of the gas generator is smaller than that of the conventional gas generator having a three-chamber configuration, so that gas is generated. It is possible to reduce the size and weight of the vessel. Further, in the gas generator having a single chamber structure in which the igniter / combustion chamber of the present invention has no partition for the explosive and the igniter is surrounded by the gas generator, the diffuser shell and closure forming the housing are formed. The shape of the shell is simplified, which facilitates the manufacture of the gas generator, which is also advantageous in terms of cost.

【0267】

By detecting the impact of a collision with a mechanical sensor installed in the airbag inflator of the present invention, an electric shock sensor, an electronic control unit, and an instrument connecting the sensor and the control unit are not required, thereby making electricity. It is possible to make the airbag device more compact and lighter in weight as compared with the airbag device that is specifically operated.

【0268】

The airbag inflator of the present invention can be operated by sensing the impact of a collision, either electric or mechanical.

【0269】

The gas generator of the present invention uses a gas generator, particularly a non-azide gas generator, and controls the pore diameter of the opening and the total area of the opening / the amount of gas generated in the direction in which the generated gas passes through the airbag. As a result, the gas generating agent can be stably burned without using a rupture disc, and an output curve suitable for airbag deployment can be obtained in a small container. Therefore, it is advantageous when the gas generator for airbags is made smaller and lighter.

【0270】

In particular, the gas generator for airbags of the present invention uses a non-azide gas generator composition containing a nitrogen-containing organic compound, an oxidizing agent, and acidic clay as essential components, and has a bulk density of 3.0 to 5.0. g / cm³By using the above filter, even if a liquid combustion residue is generated by combustion of the gas generator, slag is generated and can be filtered by the filter in the gas generator of the present invention. As a result, the minimum amount of combustion residue passes through the filter member, and damage to the airbag can be eliminated.

【0271】

The airbag device using the gas generator for an airbag of the present invention is an airbag device used for protecting the human body mounted on an automobile, an aircraft, etc., so that the airbag is not damaged by combustion residue. It is useful.

【0272】

The gas generator of the present invention can completely burn the gas generator provided in the gas generator within a desired time by the various structures described above.

【0273】

In the gas generator of the present invention, the configuration of the flange portion in the above embodiment prevents the housing from being deformed when the gas generator is operated, and therefore, the normal combustion of the gas generating means and the normal combustion of the combustion gas are prevented. A small and lightweight gas generator can be realized by guaranteeing the flow and thinning the housing.

【0274】

Further, the flange portion provided on the diffuser shell can avoid the risk of harm to the airbag side, that is, the occupant side even if the welded portion is damaged.

【0275】

By molding the diffuser shell and the closure shell by pressing, the manufacturing cost can be reduced and the diffuser shell and the closure shell can be easily manufactured.

【0276】

By providing both or one of the rib-shaped reinforcing body and the reinforcing step portion on both or one of the circular portion of the diffuser shell and the circular portion of the closure shell, the housing when the gas generator is operated, particularly the circular portion thereof. Deformation is blocked. As a result, a short path of the combustion gas is prevented between the inner surface of the circular portion and the end surface of the filter means, and the normal deployment of the airbag is always ensured.

【0277】

Although the present invention has been described above, it is clear that this can be modified in many ways. Such modifications do not deviate from the spirit and scope of the invention, and modifications that are obvious to those skilled in the art are within the scope of the claims.

[Simple explanation of drawings]

[Figure 1]

It is a vertical sectional view of the gas generator for an airbag of this invention.

[Figure 2]

It is a perspective view of the cylindrical wire mesh used in the process of manufacturing the coolant / filter of this invention.

[Fig. 3]

It is a schematic explanatory view which forms the cylindrical wire mesh of FIG. 2 in a coolant / filter.

[Fig. 4]

It is a vertical cross-sectional schematic diagram of the coolant / filter structure manufactured by this invention.

[Fig. 5]

It is a schematic diagram of the flat plate member formed from the cylindrical wire mesh compressed in the radial direction.

[Fig. 6]

It is a schematic explanatory view of the multi-layered cylindrical wire mesh formed by winding the flat plate member of FIG.

[Fig. 7]

It is a vertical sectional view of another example of the gas generator for an airbag of this invention.

[Fig. 8]

It is the schematic of the airbag apparatus of this invention which incorporated the gas generator for an airbag as shown in FIGS. 1 and 2 .

[Fig. 9]

It is a vertical sectional view of the conventional gas generator for an airbag.

[Fig. 10]

FIG. 5 is a vertical cross-sectional view of another example of an airbag gas generator of the present invention comprising the coolant / filter of the present invention.

[Fig. 11]

It is a diagram which shows the state of the flat braided wire mesh for the coolant / filter of this invention.

[Fig. 12]

It is a partial sectional view of the gas generator for an airbag provided with a conventional coolant / filter.

[Fig. 13]

It is a partial sectional view of the gas generator for an airbag of this invention provided with the coolant / filter of another example of this invention.

[Fig. 14]

FIG. 3 is a vertical cross-sectional view showing an example of an element that prevents the coolant / filter of FIG. 13 from being deformed and expanded outward.

[Fig. 15]

FIG. 3 is a vertical cross-sectional view showing another example of an element that prevents the coolant / filter of FIG. 13 from being deformed and expanded outward.

[Fig. 16]

FIG. 5 is a vertical cross-sectional view of another example of an airbag gas generator of the present invention showing an additional detailed structure.

[Fig. 17]

It is a vertical sectional view which shows the gas generator for an airbag of still another example of this invention.

[Fig. 18]

It is a partial vertical sectional view of another example of the gas generator for an airbag of this invention.

[Fig. 19]

It is a partial vertical sectional view of still another example of the gas generator for an airbag of this invention.

[Fig. 20]

It is a vertical sectional view of the gas generator for an airbag of this invention which is suitable for an airbag device for a passenger seat.

[Fig. 21]

It is a top view of the gas generator for an airbag of FIG.

[Fig. 22]

It is a top view of the gas generator for an airbag of FIG.

[Fig. 23]

It is a partial vertical sectional view of another example of the gas generator for an airbag of this invention.

[Fig. 24]

It is a vertical sectional view of the gas generator for an airbag of FIG. 23.

[Fig. 25]

It is a vertical sectional view of the mechanical sensor in the gas generator for an airbag of FIG. 23.

[Fig. 26]

It is a partial vertical sectional view of still another example of the gas generator for an airbag of this invention.

[Fig. 27]

It is a schematic perspective view of the perforated basket in the gas generator for an airbag of FIG. 26.

[Fig. 28]

FIG. 26 is a schematic vertical sectional view of a perforated basket in the gas generator for an airbag of FIG. 26.

[Fig. 29]

It is a partial vertical sectional view of another example of the gas generator for an airbag of this invention.

[Fig. 30]

It is a schematic perspective view of the perforated basket in the gas generator for an airbag of FIG. 29.

[Fig. 31]

FIG. 26 is a schematic vertical sectional view of a perforated basket in the gas generator for an airbag of FIG. 26.

[Fig. 32]

It is the schematic of the airbag apparatus of this invention which incorporated the gas generator for an airbag as shown in FIG.

[Fig. 33]

It is a vertical sectional view of still another example of the gas generator for an airbag of this invention.

[Fig. 34]

FIG. 3 is an exploded perspective view of a coolant / filter in the airbag gas generator of FIG. 33.

[Fig. 35]

It is the schematic of the airbag apparatus of this invention which incorporated the gas generator for an airbag as shown in FIG.

[Fig. 36]

It is a vertical sectional view of still another example of the gas generator for an airbag of this invention.

[Fig. 37]

It is a schematic perspective view of the perforated basket in the gas generator for an airbag of FIG. 36.

[Fig. 38]

FIG. 36 is a schematic vertical sectional view of a perforated basket in the gas generator for an airbag of FIG. 36.

[Fig. 39]

It is a vertical sectional view of still another example of the gas generator for an airbag of this invention.

[Fig. 40]

It is a schematic perspective view of the perforated basket in the gas generator for an airbag of FIG. 39.

[Fig. 41]

FIG. 3 is a schematic vertical cross-sectional view of a perforated basket in the gas generator for an airbag of FIG. 39.

[Fig. 42]

It is a vertical sectional view of still another example of the gas generator for an airbag of this invention.

[Fig. 43]

FIG. 4 is an exploded perspective view of a coolant / filter in the gas generator for an airbag of FIG. 42.

[Explanation of symbols]

1 Diffuser shell 2 closure shell 3 housing 4 Central cylinder member 5 Coolant / filter 7 Gas outlet 18 igniter 25 Gas generator 60 cylinder 62 Laminate 64 board 81 Impact sensor 82 Control unit 83 Module case 334 Through hole 409 gap 410A mounting part 411 Gas outlet 488 laser welding 500 gas outlet 504 housing 506 Gas generator 507 Coolant / filter 509 igniter 525 gap 750 coolant / filter 751 Inner layer 752 outer layer 1550 mechanical sensor 1515 detonator 2650 Perforated basket