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 preferably used in an inflatable safety system of an automatic vehicle. More specifically, an airbag gas generator characterized by an internal structure of a housing and an airbag device using the same. Regarding.

【0002】

[Previous technology]

The airbag system installed in various vehicles including automobiles supports the occupant with an airbag (bag body) that is rapidly expanded by gas when the vehicle collides at high speed, and the occupant due to inertia. The purpose is to prevent injuries by colliding with hard parts inside the vehicle such as the steering wheel and front glass. Such an airbag system usually consists of a gas generator that operates in the event of a vehicle collision to release gas, and an airbag that introduces and expands the gas.

【0003】

Like gas generators for driver's seats, passenger seats, or side bumps, this gas generator requires different amounts of generated gas depending on its location (or application), and the entire housing. The shape is also different.

【0004】

Of these, the gas generator arranged on the passenger seat side has conventionally had a cylindrical shape whose housing shape is long in the axial direction, and the working gas for expanding the airbag generated in the housing is the peripheral wall thereof. Those discharged from the openings of a plurality of gas outlets formed in the housing are widely used.

【0005】

Further, the amount of working gas generated to inflate the airbag is generally adjusted by the amount of gas generating means housed in the housing. In such a case, even if the amount of gas generating means housed in the housing is slightly different, if the same member can be used, the ease of manufacturing can be improved and the manufacturing cost can be reduced.

【0006】

Further, since the gas generating agent contained in the combustion chamber is ignited and burned by the operation of the ignition means, depending on the shape of the combustion chamber, all the gas generating agents contained in the combustion chamber may be ignited and burned. May require high power ignition means. For example, in a cylindrical combustion chamber that is long in the axial direction, when the ignition means is arranged at the end in the axial direction, in order to burn the gas generating agent contained in the other end side by the ignition means. , A high-power ignition means capable of emitting a flame or the like to the end thereof is required. However, since such a high-power ignition means is relatively expensive, it is not preferable from the viewpoint of reducing the manufacturing cost of the gas generator.

【0007】

[Problems to be Solved by the Invention]

Therefore, the present invention solves the above-mentioned conventional problems, has a simple structure, is easy to manufacture, and can reduce the manufacturing cost, but can change the capacity of the gas generator, and further ignites a normal output. Provided is a gas generator for an airbag that can reliably ignite and burn a gas generator even by means.

【0008】

[Means for solving problems]

The gas generator for an airbag of the present invention is formed so that a combustion chamber accommodating a gas generating means and a filter means accommodating chamber accommodating a filter means are axially adjacent to each other and communicate with each other in a housing. The combustion chamber and the filter means accommodating chamber are characterized in that they are separated by a partition member having a through hole. As a result, even if no moisture-proof means is provided between the two chambers, the moisture-proof of the gas generating means can be embodied by closing the gas discharge port.

【0009】

That is, the gas generator for an airbag of the present invention includes an ignition means operated by an impact and a gas generating means ignited and burned by the ignition means in a tubular housing longer in the axial direction than the radial direction. A combustion chamber for accommodating gas generating means and a filter means accommodating chamber for accommodating filter means are provided in the housing of the airbag gas generator so as to be adjacent and communicate with each other in the axial direction. The combustion chamber that accommodates the gas generating means is an airbag gas generator that is partitioned from the filter means accommodating chamber side by a partition member provided with a through hole.

【0010】

The partition member has a function of preventing the gas generating means housed in the combustion chamber from moving into the filter means housed chamber. However, this partition member does not have a function of adjusting the internal pressure in the combustion chamber communicating with the filter means accommodating chamber. The adjustment of the combustion pressure in the housing is adjusted exclusively by the opening area of the gas outlet formed in the housing. Therefore, the partition member used for such a purpose has a through hole smaller than that of the gas generating means housed in the combustion chamber, and the total area of the opening is the total area of the opening of the gas discharge port. Is formed larger than. The total area of the openings of the partition member is preferably 1.5 times or more the total area of the openings of the gas discharge port. In the present specification, the total area of the openings of the partition member means the total area of the openings of all the through holes formed in the partition member, and the total area of the openings of the gas discharge port is formed in the housing. It is the sum of the opening areas of the gas outlets.

【0011】

This partition member needs to have sufficient strength to withstand the internal pressure of the combustion chamber (internal pressure of the combustion chamber at the time of combustion of the gas generating means) communicating with the filter means accommodating chamber. In order to secure such strength, for example, it may be formed in a curved shape so as to be convex toward the combustion chamber side. The partition member formed in such a shape is less likely to be deformed by the combustion pressure of the gas generating means in the combustion chamber.

【0012】

Since the plurality of through holes formed in the partition member are not closed by sealing tape or the like, the combustion chamber and the filter means accommodating chamber are formed so as to always communicate with each other. On the other hand, the tubular housing is formed with a gas discharge port for introducing the working gas generated in the housing into the airbag (bag body). Therefore, for example, if the gas discharge port is closed with a sealing tape or the like, the combustion chamber accommodating the gas generating means can be moisture-proofed by the sealing tape that closes the gas discharge port. In this case, it is possible to prevent moisture from the gas generating agent in the housing and the combustion chamber and prevent rust from the internal metal member without further providing a sealing mechanism in the combustion chamber. That is, by simplifying the sealing mechanism in the combustion chamber, a gas generator with further reduced manufacturing cost is realized. Further, the amount of working gas for inflating the airbag is usually adjusted according to the amount of gas generating agent contained in the combustion chamber. Therefore, if the capacity of the gas generator can be appropriately changed according to the required amount of working gas generated, the gas generator for airbags can adjust the amount of gas generated in a wide range by the same gas generator. Is realized. However, even if the capacity of the gas generating agent changes, it is necessary to reliably ignite and burn by the ignition means, and it is desirable to prevent the gas generating agent from moving to prevent damage due to vibration.

【0013】

Therefore, in the present invention, an inward flange-shaped plate member that supports the gas generating agent is arranged in the combustion chamber provided in the tubular housing, and the gas generating agent in the combustion chamber is pressed and / / by the plate member. Alternatively, an airbag gas generator that is to be held is also provided. By arranging the plate member so as to be slidable in the axial direction of the housing, the amount of the gas generating agent accommodated can be adjusted. For example, this plate member can be formed so as to be fitted inside the combustion chamber and function to press the gas generating means housed in the combustion chamber against the filter means accommodating chamber side, that is, the partition member side. As a result, even when the accommodating amount of the gas generating agent is slightly changed, the gas generating agent in the combustion chamber is fixed by the plate member and the partition member, and damage due to vibration can be prevented.

【0014】

In the present invention, in order to obtain a gas generator that reliably ignites and burns the gas generator by the ignition means even if the capacity of the gas generator is changed, a plurality of fires are transmitted to the combustion chamber and the peripheral wall. It is desirable to dispose of a fire transmission tube with holes formed in it.

【0015】

That is, it is an airbag gas generator in which an ignition means operated by an impact and a gas generating means ignited and burned by the ignition means are housed in a tubular housing longer in the axial direction than the radial direction. In the housing, a combustion chamber for accommodating the gas generating means and a filter means accommodating chamber for accommodating the filter means are provided adjacent in the axial direction, and a plurality of combustion chambers are provided on the peripheral wall in the combustion chamber. An air bag containing a fire-transmitting tube in which a fire-transmitting hole is formed, and the fire-transmitting tube extends in the axial direction of the housing, and an end thereof is connected to an ignition means accommodation chamber in which the ignition means is housed. Use as a gas generator.

【0016】

The fire transmission tube extends axially along the housing and its end is connected to the ignition means containment chamber in which the ignition means is housed. When the gas generating agent is supported by the plate member, the fire transmitting tube can be formed so as to project into the accommodation space of the gas generating means through the central opening of the plate member, and is formed in the fire transmitting tube. It is preferable that a part or all of the plurality of fire holes are in the accommodation space of the gas generating means. As a result, the flame or the like generated by the operation of the ignition means is ejected into the combustion chamber from the fire transmission hole through the fire transmission tube without being blocked by the plate member, and the gas generating agent in the combustion chamber is surely ignited. Can be burned.

【0017】

In particular, in the gas generator of the present invention, since the combustion chamber and the filter means are formed adjacent to each other in the axial direction of the housing, the distance in the length direction of the combustion chamber can be shortened. This makes it possible to simplify the ignition means as compared with the case where, for example, a tubular filter is arranged in the housing and a combustion chamber is provided inside the gas generator. That is, when a combustion chamber is provided in the filter means, the combustion chamber is formed long in the axial direction. Therefore, in order to ignite and burn the gas generating agent contained in the end of the combustion chamber, the ignition means is used. It becomes a complicated and expensive ignition system (ignition means) using an explosive wire or the like by increasing the amount of the combustion charge constituting the above. However, if the combustion chamber and the filter means accommodating chamber are arranged in this way, the distance in the length direction of the combustion chamber can be shortened, and the gas generating means can be ignited and burned even by the usual ignition means. Can be done.

【0018】

The tubular housing forming the outer container of the gas generator can be composed of a tubular diffuser shell having a plurality of gas outlets on the peripheral wall and a closure shell that closes the openings at both ends of the peripheral wall portion. The plurality of gas outlets formed on the peripheral wall of the diffuser shell are formed within a range in which the filter means accommodating chamber described later is provided. Further, the closure shell that closes the opening on the combustion chamber side of the diffuser shell can be composed of an annular portion and a tubular portion that protrudes outward in the axial direction of the housing, and the ignition means is housed inside the tubular portion. be able to. When the housing is configured in this way, the diffuser shell only needs to form a gas outlet on the peripheral wall of the metal straight tube, and the manufacturing cost can be reduced. Further, if the ignition means is housed in the tubular portion protruding to the outside of the housing, the maximum space can be secured in the combustion chamber.

【0019】

In the filter means accommodating chamber, a filter means for cooling the combustion gas generated by the combustion of the gas generating means can be arranged. This filter means is arranged in the housing for the purpose of cooling and / or purifying the combustion gas generated by the combustion of the gas generating means. For example, a filter for purifying a conventionally used combustion gas. In addition to using a coolant for cooling the generated combustion gas, a wire mesh made of an appropriate material may be used as an annular laminate, and a compression-molded laminated wire mesh filter or the like can also be used. This filter means can be formed as a double structure having different pressure losses on the inside and the outside, and can also have a function of protecting the filter means on the inside and a function of suppressing swelling of the filter means on the outside. .. Further, the wire net formed by using such a wire rod is not limited to the wire net formed by using an expanded metal, and a tubular one formed by using an expanded metal can also be used as a filter means. The filter means can also suppress its swelling by supporting the outer periphery thereof with an outer layer made of a laminated wire mesh body, a perforated cylindrical body, an annular belt body, or the like.

【0020】

It is desirable that the filter means is arranged after securing a gap having a predetermined width between the filter means and the inner peripheral surface of the housing. By forming a gap between the outer peripheral surface of the filter means and the inner peripheral surface of the housing, when the combustion gas passes through the filter means, the gas concentrates and passes through the portion of the filter means near the gas discharge port. And realize the full use of the filter means.

【0021】

Therefore, in the present invention, in order to secure a gap between the inner peripheral surface of the housing and arrange the filter means, the tubular diffuser shell having a plurality of gas discharge ports on the peripheral wall and the openings at both ends of the peripheral wall are closed. The housing is composed of the closure shell, and the closure shell that closes the opening on the side of the filter means accommodating chamber also provides a gas generator that supports and fixes the filter means. Such a gas generator may include, for example, an annular portion connecting the closure shell to the opening edge of the diffuser shell, a circular portion protruding from the annular portion toward the filter means accommodating chamber, and a protrusion protruding from the annular portion to the outside of the housing. It is composed of a screw portion to be formed, and the circular portion thereof can be formed so as to abut and support the inner peripheral surface of the filter means. Further, on the combustion chamber side of the filter means, when a filter support member in which the inner peripheral wall of the annular portion is projected into the hollow portion of the filter means and the outer peripheral wall is internally fitted in the housing is arranged, the inside of the filter means support member. The peripheral wall and the circular portion of the diffuser shell can support the inner peripheral surface of the filter means.

【0022】

As a gas generating means housed in the combustion chamber, an inorganic azide that has been widely used in the past, for example, an azide-based gas generating agent based on sodium azide (sodium azide), and a non-azidated gas that is not based on inorganic azide are generated. Agents can be used. However, in consideration of safety, a non-azide gas generating agent is desirable.

【0023】

The above-mentioned gas generator for an airbag is housed in a module case together with an airbag (bag body) that expands by introducing gas generated by the gas generator, and becomes an airbag device. In this airbag device, the gas generator operates in conjunction with the shock sensor detecting the shock, and the combustion gas is discharged from the gas discharge port of the housing. This combustion gas flows into the airbag, which causes the airbag to break through the module cover and bulge, forming a shock-absorbing cushion between the rigid structure in the vehicle and the occupant.

【0024】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the gas generator for an airbag of the present invention will be described based on the embodiment shown in the drawings. "Embodiment 1" FIG. 1 is a vertical sectional view showing a first embodiment of the gas generator for an airbag of the present invention. In the gas generator shown in this embodiment, the combustion chamber and the filter means accommodating chamber are axially adjacent to each other and communicate with each other, and the gas generating means in the combustion chamber is supported by a plate member and further transmitted to the combustion chamber. An airbag gas generator with a protruding fire tube.

【0025】

In this gas generator, a housing 3 is formed by coupling and integrating a cylindrical diffuser shell 1 having a gas discharge port 4 and a closure shell 2 that closes an end opening of the diffuser shell 1. In the housing 3, a combustion chamber 5 for accommodating the gas generating agent 7 and a filter means accommodating chamber 6 for accommodating the tubular filter means 15 are provided adjacent to each other in the axial direction.

【0026】

The combustion chamber 5 formed at the end of the housing 3 is separated from the filter means accommodating chamber 6 by a partition member. In the present embodiment, the baffle member 10 that is convexly curved toward the combustion chamber side is used as the partition member. This baffle member 10 has a function of preventing the gas generating agent 7 from moving to the filter means accommodating chamber side 6, and sends the working gas generated by the combustion of the gas generating agent 7 to the filter means accommodating chamber 6. A plurality of through holes 11 that communicate the combustion chamber 5 and the filter means accommodating chamber 6 are formed. In the present embodiment, since the through hole 11 is not closed by the sealing tape 17 or the like, the combustion chamber 5 and the filter means accommodating chamber 6 are always in communication with each other. Then, moisture-proofing of the gas generating agent 7 housed in the combustion chamber 5 and rust-proofing of the internal metal member are performed only by sealing the plurality of gas discharge ports 4 formed on the peripheral wall of the tubular housing 3. Therefore, the sealing mechanism on the combustion chamber 5 side can be simplified. However, if the purpose is not necessarily to simplify the sealing mechanism, for example, a gas generator in which the combustion chamber is partitioned from the filter means accommodating chamber by a baffle member, a gas generator that presses and holds a gas generator by a plate member, and / or In the gas generator in which the fire transmission tube protrudes into the combustion chamber, it is naturally possible to close the through hole of the baffle member with a sealing tape that bursts due to the combustion of the gas generator. In this case, combustion The chamber and the filter means accommodating chamber will be formed so as to be communicable. That is, in the present invention, if necessary, the combustion chamber and the filter means accommodating chamber may always be communicated with each other, or may be formed as being communicated with each other by combustion of a gas generating agent.

【0027】

A perforated cylindrical gas generator 7 is housed in the combustion chamber 5, and the gas generator 7 is supported between the inward flange-shaped plate member 18 and the baffle member 10. As a result, the movement of the gas generating agent 7 is prevented, and it is possible to avoid a situation in which the gas generating agent 7 is damaged due to vibration or the like. In the present embodiment, the peripheral wall portion 19 of the plate member 18 is internally fitted in the combustion chamber 5, and the flange portion 20 connected to the peripheral wall portion 19 supports the gas generating agent 7. Since the plate member 18 can slide in the three-axis directions of the housing, the movement of the gas generating agent 7 can be reliably prevented even when the accommodating amount of the gas generating agent 7 changes.

【0028】

The baffle member 10 having the through hole 11 supports the gas generating agent 7 housed in the combustion chamber 5 and prevents the gas generating agent 7 from moving into the filter means house 6. Further, this baffle member does not have a function of adjusting the combustion internal pressure in the first combustion chamber 5. Therefore, the inner diameter of the through hole 11 is adjusted to be smaller than that of the first gas generating agent 7, and the total area of the opening thereof is adjusted to be larger than the total area of the opening of the gas discharge port 4.

【0029】

The diffuser shell 1 forming a part of the housing 3 is formed by using a cylindrical straight tube, and a plurality of gas outlets 4 are formed on the peripheral wall in the range where the filter means accommodating chamber 6 is provided. There is. The gas outlet 4 is closed with a sealing tape 17 made of aluminum for the purpose of preventing moisture. Further, the gas discharge port 4 has a function of adjusting the internal pressure of the housing 3 when the gas generating agent 7 is burned, and the total area of the opening thereof is the gas generating agent 7 housed in each combustion chamber 5. It is determined based on the characteristics.

【0030】

The closure shell 2a that closes the opening on the filter means accommodating chamber 6 side of the diffuser shell 1 has an annular portion 21 connected to the opening edge of the diffuser shell 1 and a circular portion 22 protruding from the annular portion 21 toward the filter means accommodating chamber 6 side. And a screw portion 23 protruding outward in the axial direction of the housing 3 from the annular portion 21. The circular portion 22 is adjusted to a size that allows it to come into contact with the inner peripheral surface of the filter means 15, and serves to support the filter means 15. The gas generator can be attached to the module case by combining the threaded portion 23 with a nut (not shown).

【0031】

On the other hand, the closure shell 2b that closes the opening on the combustion chamber 5 side of the diffuser shell 1 is integrally connected to the annular portion 21b connected to the opening end of the diffuser shell 1 and the central opening of the annular portion 21b, and is the shaft of the housing 3. It is composed of a tubular portion 24 that projects outward in the direction. In the internal space of the tubular portion 24, an ignition means composed of an igniter 13 housed in the igniter 13 collar and a propellant 14 ignited and burned by the igniter 13 is housed. Since the peripheral edge of the annular portion 21b is formed so as to project outward in the radial direction of the diffuser shell 1, it can function as a flange portion when the gas generator is attached to the module.

【0032】

The tubular portion of the closure shell 2 is closed by a cap member 25 connected to the end of the fire transmission tube 8. The fire transmission tube 8 connected to the cap member 25 is formed with a plurality of fire transmission holes 9 on the peripheral wall, and the internal space thereof communicates with the inside of the tubular portion 24 of the closure shell 2, that is, the space in which the ignition means is housed. doing. The fire transmission tube 8 projects into the combustion chamber 5 through the central opening of the inward flange-shaped plate member 18 that supports the gas generating agent 7, and the fire transmission hole 9 formed in the peripheral wall thereof is formed. It is formed so as to exist in the combustion chamber 5. As a result, the flame generated by the operation of the ignition means is ejected from the fire transmission hole 9 into the combustion chamber 5 through the fire transmission tube 8. Further, the plate member 18 is fitted inside the housing 3 and is slidable in the length direction of the housing 3, but the plate is formed according to the amount of the gas generating agent 7 contained in the combustion chamber 5. Even when the position of the member 18 is changed, the gas generating agent 7 can be reliably ignited and burned by the flame ejected from the fire transmission hole 9. In the present embodiment, the fire transmission tube 8 is blocked by a stopper 29 on the tip side (that is, the filter means accommodating chamber 6 side) of the portion where the fire transmission hole is formed. This stopper 29 eliminates wasted space when the ignition charge is ignited by blocking the internal space of the fire transmission tube 8 in a range not related to the fire transmission hole 9, and raises the pressure in the space in which the ignition means is housed. It functions to improve the ignitability of the igniter 14.

【0033】

A cylindrical filter means 15 is housed in the filter means storage chamber 6. In the present embodiment, an expanded metal formed by winding it in multiple layers is used. In addition, as the filter means 15, it is also possible to use a coolant filter formed by using a laminated wire mesh body and having both a cooling effect of combustion gas and a collecting function of combustion residuals. The end of the combustion chamber 5 side of the filter means 15 is supported and fixed to the filter means support member 12, and the other end is supported and fixed by the circular portion 22 of the closure shell 2b that closes the opening on the filter means accommodating chamber 6 side. Has been done. As a result, the filter means 15 has a gap 16 having a predetermined width between the outer peripheral surface thereof and the inner peripheral surface of the housing. In the present embodiment, the filter means support member 12 has an inner peripheral wall 26 that is internally fitted in the central opening of the filter means 15 and an outer peripheral that extends to the side opposite to the inner peripheral wall and is internally fitted in the inner peripheral surface of the housing 3. It is composed of a wall 27 and an annular portion 28 connecting the inner peripheral wall and the outer peripheral wall. The filter means support member 12 is fixed in the housing 3 by an embossing structure or press fitting provided in the housing 3. The gap 16 secured between the outer peripheral surface of the filter means 15 and the inner peripheral surface of the housing 3 functions as a gas flow path, and when the combustion gas passes through the filter means 15, it concentrates near the gas discharge port 4. To avoid.

【0034】

In the operation of this gas generator, when the igniter 13 is activated and the igniter 14 is ignited and burned, the flame is ejected from the igniter hole 9 into the combustion chamber 5 through the igniter tube 8. As a result, the gas generating agent 7 in the combustion chamber 5 ignites and burns to generate a working gas, and this gas flows into the filter means accommodating chamber 6 through the through hole 11 of the baffle member 10. After that, the working gas is purified and cooled while passing through the filter means 15, breaks the sealing tape 17 that closes the gas discharge port 4, and is discharged from the gas discharge port 4. Embodiment 2 FIG. 2 shows an embodiment of the airbag device of the present invention in the case where a gas generator using an electrically ignitable ignition means is included.

【0035】

This airbag device consists of a gas generator 200, an impact sensor 201, a control unit 202, a module case 203, and an airbag 204. The gas generator 200 uses the gas generator described with reference to FIG. 1, and its operating performance is adjusted so as not to give an impact to the occupants as much as possible in the initial stage of gas generator operation. ing.

【0036】

The impact sensor 201 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.

【0037】

The control unit 202 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 201 exceeds a certain value, the control unit 202 starts the calculation, and when the calculation result exceeds a certain value, the operation signal is output to the igniter 13 of the gas generator 200.

【0038】

The module case 203 is made of, for example, polyurethane and includes a module cover 205. The airbag 204 and the gas generator 200 are housed in the module case 203 to form a pad module. This pad module is usually mounted on the steering wheel 207 when mounted on the driver's side of the vehicle.

【0039】

The airbag 204 is made of nylon (for example, nylon 66), polyester, or the like, and the bag mouth 206 surrounds the gas outlet of the gas generator and is fixed to the flange of the gas generator in a folded state. ..

【0040】

When the semiconductor type acceleration sensor 201 senses an impact at the time of a vehicle collision, the signal is sent to the control unit 202, and when the impact signal from the sensor exceeds a certain value, the control unit 202 starts the calculation. When the calculated result exceeds a certain value, an operation signal is output to the igniter 13 of the gas generator 200. As a result, the igniter 12 operates to ignite the gas generating agent, and the gas generating agent burns to generate gas. This gas is ejected into the airbag 204, which causes the airbag to break through the module cover 205 and bulge, forming a shock-absorbing cushion between the steering wheel 207 and the occupant.

【0041】

[Effect of the invention]

According to the present invention, although the structure is simple and easy to manufacture, the capacity of the gas generator can be changed, and the gas generator can be reliably ignited and burned even by an ignition means having a normal output. It becomes a gas generator for airbags that can be made to. In particular, by simplifying the sealing mechanism in the combustion chamber, a gas generator for airbags with further reduced manufacturing costs is provided.

【0042】

Further, in the gas generator including the structure in which the fire transmission tube and the plate member are combined, the amount of the gas generator contained in the combustion chamber can be appropriately changed, and the gas generator that can be used for general purposes can be generated. A vessel is provided.

[Simple explanation of drawings]

[Figure 1]

The cross-sectional view along the length direction which shows one Embodiment of the gas generator for an airbag of this invention.

[Figure 2]

The block diagram of the airbag device of this invention.

[Explanation of symbols]

1 Diffuser shell 2 closure shell 3 housing 4 Gas outlet 5 Combustion chamber 6 Filter means containment room 7 Gas generator 8 Fire transmission tube 10 Baffle member 12 Filter means support member 13 igniter 15 Filter means 17 Seal tape 18 Plate member