Airbag for a motor vehicle

The present invention relates to an automobile airbag according to the preceding portion (preamble) of claim 1.

Such a known airbag can be filled with gas to protect the occupant, and has an airbag cover composed of two cover portions facing each other in the state before the airbag is expanded. In order to exhaust gas from the airbag cover when the airbag is inflated or after it is inflated, an exhaust port is provided on one of the two cover parts, and the two cover parts are joined so as to be openable. A joining means for suppressing the outflow of gas from the exhaust port is provided. The joining means is configured to interact with the airbag cover when the airbag is inflated to open the joining so that gas can flow out of the exhaust port.

<p> Therefore, an object of the present invention is to improve the configuration of the above-mentioned type of airbag with respect to the opening of the exhaust port in the expansion process.</p>

<p> This problem is solved by an airbag having the characteristics according to claim 1 of the present invention. According to it, the two covers each form an airbag layer and are joined to each other to form an airbag cover, which is configured to move in a direction away from each other when the airbag is inflated, and the airbag. By moving the layers in a direction away from each other, a force is applied to the bonding means, and the bonding between the airbag layers is opened.</p><p> By configuring the two airbag layers of the airbag cover to be openly joined by the joining means, the gas exhaust from the airbag (opening timing of the exhaust port) is openly joined to the two airbag layers. It is advantageous because it can be controlled by the relative position of the part. Further, the opening timing of the exhaust port (when the joining means is opened, and in some cases, when the joining means is destroyed) can be controlled by the rigidity of the joining means itself. For example, when the joining means is a tear stitch, the rigidity is determined by the length of the tear stitch, the stitch material, and the cross section of the stitch material.</p><p> If openable joints are located between the airbag layers of the airbag cover, for example, in the area of the airbag cover that unfolds early when the airbag expands, the joints are also air. Since the bag layers are opened at an early stage by moving in a direction away from each other, the exhaust port is also opened at an early stage.</p><p> However, if the open joint between the airbag layers is located in the area of the airbag cover that unfolds later when the airbag expands, then the open joint between the two airbag layers is as described above. The exhaust port also opens with a relative delay compared to the case where it is in a proper position. This allows the airbag, or more precisely, the airbag cover, to be positioned quickly and efficiently.</p><p> However, it is also possible to join two or more cover portions of the airbag covers facing each other, that is, the airbag layers, by a joining means, particularly a tear stitch. For example, the airbag layers are folded in multiple layers to form a plurality of cover portions of airbag covers that are opposed to each other or are continuously arranged, and these are joined by a joining means (for example, a tear stitch). It is also possible.</p><p> The open joint between the two airbag layers formed by the joining means preferably extends at least partially along the exhaust vent (per flat spread state of the two airbag layers). In this case, the joint extends at least partially along the exhaust port from the outer edge of the airbag cover.</p><p> In one aspect of the invention, the joining means secures the airbag layers to each other so that the two airbag layers constitute at least a first chamber of the airbag cover and an adjacent second chamber. Therefore, in order to inflate the airbag, it is preferable that the airbag is configured to be filled with gas through the first chamber, and the exhaust port is provided in the second chamber.</p><p> The first chamber is preferably configured to have a capacity greater than that of the second chamber. The capacity of the first chamber relative to the capacity of the second chamber also makes it possible to control the timing of opening the joint, that is, opening the exhaust port. The larger the capacity of the first chamber relative to the second chamber, the more force is applied to the joining means to open the two airbag layers by filling the first chamber, resulting in a second chamber with an exhaust port. The time required to open becomes longer.</p><p> In an embodiment of the present invention, the openable joint formed by the joining means has a discontinuity, and upon expansion, the gas in the first chamber is already in the first chamber before the joint is opened. It is configured so that it can flow into the two chambers and flow out of the airbag through the exhaust port. At this time, it is preferable that the joining means is formed so that the amount of gas flowing out from the exhaust port per unit time during expansion is considerably increased after the joint is opened as compared with before the joint is opened. ..</p><p> In another embodiment, an openable joint formed by the joining means between the airbag layers separates the first and second chambers so that the gas in the first chamber is released before the joint is opened. , It is configured so that it does not flow into the second chamber and flow out from the exhaust port.</p><p> The two airbag layers of the airbag cover are preferably joined to each other via their respective outer peripheral edges. The second chamber preferably has a part of each of the outer edges of the first airbag layer and the second airbag layer. The airbag layer is preferably composed of a fabric, yarn or film-like material of a predetermined area and is sewn, bonded or welded.</p><p> The joining means for openly joining between the airbag layers of the airbag cover is composed of at least two material regions that are openly joined to each other. When a predetermined force that applies pretension in opposite directions acts on the material regions, the material regions are separated from each other, the joints are opened, and in some cases, the second chamber is disassembled. ..</p><p> Such areas can be configured, among other things, as portions of integrally formed tear seams or adhesives (eg, silicon). In the pre-airbag expansion state, such a tear seam joins the opposing airbag layer and, in some cases, a cover element to cover the exhaust port to the first airbag layer, thus providing air. As the bag expands (in this case, both airbag layers are pressed away from each other), the force that tears the tear stitches, that is, the two parts (material regions) of the tear stitches that are joined together. The separating force is applied to the tear seam and the joint of the airbag layer is opened.</p><p> The at least one tear seam is preferably configured to surround the exhaust vent at least partially (with the two airbag layers spread flat). It is preferred that at least one tear seam extends each free end to the outer edge of the airbag cover formed by the peripheral edges of the two overlapping airbag layers.</p><p> In another embodiment of the invention, the joining means is composed of two tear stitches, each extending from the outer edge of the airbag cover and forming an acute angle with each other. In this case, the two tear seams are crossable with each other and the second chamber formed by joining the two airbag layers by the tear seams is configured to be completely separated from the first chamber. ing. Alternatively, the two tear stitches can be arranged relative to each other so that a gap is formed between the ends of the tear stitches facing each other. In this case, the gas in the first chamber can already flow into the second chamber through the gap and flow out of the airbag from the exhaust port before the joint formed by the tear seam is opened. Become.</p><p> In another aspect of the invention, the joining means is formed by two tear stitches extending from the outer edge of the airbag cover and tear stitches extending in a direction intersecting these two tear stitches. ing. In this case as well, the chamber is configured to be gastight (airtight) before the joint is opened, or the second chamber is joined to the first chamber in a gas-communicated state. As such, it is possible to cross the tear stitches extending in the intersecting direction with one or both of the other two tear stitches.</p><p> The exhaust port provided in the second chamber is preferably formed in the first airbag layer.</p><p> In the embodiment of the present invention, a cover element covering the exhaust port is provided. The exhaust vent closed by the cover element, i.e. the covered exhaust vent, does not have to be completely gas permeable. Rather, it is important that when the exhaust port is open, many times more gas flows out of the airbag than when it is closed.</p><p> Further, the joining means preferably joins the cover element and the airbag layer so as to be openly joined so that the cover element comes into contact with the exhaust port. In this case, since the joining means is configured to open the cover element when the airbag is expanded, the exhaust port is opened by opening the openable joint, and the gas can flow out from the exhaust port. To. That is, the joining means joins the two airbag layers to each other (in some cases, with the exhaust port provided in the chamber) and joins the cover element to the first airbag layer, so that when expanded, 2 When a predetermined force is applied to the joining means by moving the two airbag layers in a direction away from each other, the openable joining between the cover element and the first airbag layer is opened.</p><p> Since the cover element is preferably configured to shield the exhaust port from the external space around the airbag cover, the cover element is placed in the edge region of the exhaust port or in the first air bag layer provided with the exhaust port. As long as it is properly attached, it is preferable to configure the cover element to be lifted away from the exhaust port by pressurizing the cover element with the gas flowing out of the internal space when the airbag is inflated.</p><p> In one aspect of the invention, the cover element is permanently joined to the first airbag layer via another joining means, such as a seam, and is further openable joining means (eg, tear stitching). Since it is attached to the first airbag layer through the eye), the cover element remains outside the exhaust port even after the open joint of the two airbag layers is opened by the joining means (tear stitch). It is just pushed out and still covers the exhaust port.</p><p> In other words, when the junction between the two airbag layers is opened, the cover element is pressurized with gas from the first position to close the exhaust, where the gas passes through the exhaust and from the airbag cover. It is configured to be moved to a second position that is relative to the exhaust port so that it can flow out into the external space surrounding the airbag cover.</p><p> For this reason, it is preferable that the first region of the cover element is in close contact with the edge region of the exhaust port that defines the exhaust port at the first position. This causes the exhaust vents to be sufficiently closed so that only a small amount of gas will flow out of the airbag cover through the exhaust vents closed as described above.</p><p> However, in the second position, the cover element is curved in a direction away from the exhaust port, and the bulge of the cover element causes the first region of the cover element to be spaced from the exhaust port to create an external space in front of the exhaust port. It is preferably configured to be arranged in.</p><p> Since the cover element in close contact with the edge region of the exhaust port is configured to form the above-mentioned bulge in the second position, the cover element makes the cover element in the first region in the first position. It has at least one crease that divides it into a second region connected to the first region. Therefore, when the cover element is in the first position, the crease is secured to the first airbag layer by joining means so that the first region of the cover element is in close contact with the edge region of the exhaust port, and the first area of the cover element. The two regions are arranged as an intermediate layer between the first region of the cover element and the first airbag layer.</p><p> As the airbag expands (after the joining means is opened), when the cover element is pressurized with gas as described above, the first region of the cover element is lifted from the edge region of the exhaust port. Leave. At this time, the folds of the cover element are unfolded, and the above-mentioned bulge is formed on the cover element. By providing the crease, the material of the cover element necessary for forming the bulge portion is supplied. Of course, a plurality of creases may be provided on the cover element.</p><p> The cover element has a joint, particularly an outer peripheral edge that is permanently (fixed) joined to the first airbag layer by a seam. Therefore, the joint is partially recessed so that the cover element and the first airbag layer form an edge region of the opening formed between the cover element and the first airbag layer, respectively. It is composed continuously. Therefore, the gas flowing out from the exhaust port (when the joining means is open) can flow out to the external space of the airbag cover through the opening. However, when the cover element is in the first position, the two edge regions are in contact with each other.</p><p> In the embodiment of the present invention, the cover element is configured in a triangular shape. For this reason, it is preferable that the cover element has two outer edges extending in the longitudinal direction adjacent to each other, and the cover element is attached to the first airbag layer via the outer edge portion. The two edges are preferably provided at right angles. The remaining third longitudinally extending edge or edge region connected to the two adjacent edges of the cover element is not joined to the first airbag layer and thus has the above-mentioned opening. Is formed between the cover element and the first airbag layer. For this reason, the crease that the cover element has at the first position preferably extends along one of the two adjacent edges and is parallel to the edges. In this case, the crease extends to the edge region of the cover element that defines the opening.</p><p> In another aspect of the invention, the cover element is configured in strips, in which case the cover element is preferably attached to the first airbag layer via two opposing edges. For this reason, the strip-shaped cover element, together with the first airbag layer, forms two opposing openings defined by the edge region of the cover element and the region of the first airbag layer facing the edge region, respectively. doing. Thus, the crease is formed along one of two opposing edges that attach the strip cover element to the first airbag layer.</p><p> It is preferred that at least one tear stitch is applied over the entire cover layer, with the tear stitches overlapping each other in the pre-expansion state, i.e. two airbag layers of the airbag cover. And the cover element are pierced.</p><p> Further, it is preferable to join the first region of the cover element to the second region of the cover element in order to fix the spatial position of at least one crease of the cover element by such a tear seam.</p><p> The cover element is particularly preferably configured as a flexible cover layer made of an airbag fabric (which may be the same as the fabric used for the airbag cover).</p><p> In the embodiment of the present invention, an exhaust port for exhausting gas from the airbag cover is also provided in the second airbag layer. It is preferable that such an exhaust port is arranged to face the exhaust port provided in the first airbag layer jointly (per state in which the two airbag layers are spread flat). If a plurality of exhaust ports are provided in the first airbag layer, the exhaust ports are optionally provided in the second chamber and, in some cases, further covered by a cover element.</p><p> The first airbag layer preferably constitutes an impact surface for the occupant to which the protected occupant jumps in while holding the gas (protected occupant?). The airbag is preferably configured as a driver airbag, a passenger airbag, and a side airbag.</p><p> The features and advantages of the present invention will be clarified by the following description of the drawings showing embodiments of the present invention.</p>

FIG. 1 shows an airbag G spread flat on a plane having a first airbag layer 1 and a second airbag layer 2. The two airbag layers 1 and 2 have outer peripheral edges 1a and 2a, respectively, and are preferably along the outer peripheral edges 1a and 2a of the two airbag layers 1 and 2 via the outer peripheral edges. They are joined together via an extending seam 30. In this way, the two airbag layers 1 and 2 constitute the airbag cover H of the airbag G that can be filled with gas. In FIG. 1, the second airbag layer 2 is covered with the first airbag layer 1 and is not visible.

The airbag cover H can be filled with gas by a gas generator (not shown). For this purpose, the gas generator is arranged in the internal space of the airbag G surrounded by the airbag cover H so that the outgassing by the gas generator is directly limited to the inside of the airbag cover H. It is configured. Further, the gas generator can be joined to the inlet of the airbag cover H via a suitable pipeline. Further, the gas generator can be projected from the inlet of the airbag cover H into the internal space of the airbag cover H. Preferably, the airbag G is composed of flexible airbag fibers, but it can also be formed of a film-like material having a fixed area.

The airbag cover H is provided with an exhaust port O in the first airbag layer 1, and gas can flow out from the airbag cover H through the exhaust port (open state). As a result, the energy absorption action of the airbag G when the protected occupant jumps into the inflated airbag G is improved.

The airbag cover H is divided into a first chamber K and a smaller second chamber K'by two tear seams V that join the two airbag layers 1 and 2 to each other. The tear seam V (with the airbag cover H flattened) has ends 53 and 54, respectively, from the outer edge 40 of the airbag cover H formed by the two edges 1a and 2a. It is stretched to form an acute angle. The exhaust port O is formed in the second chamber K'.

In order to inflate the airbag G, the gas is discharged into the internal space of the airbag cover H surrounded by the first chamber K. As a result, the gas pressure generated in the first chamber K presses the first airbag layer 1 and the second airbag layer 2 in a direction in which they are separated from each other, and the force that finally destroys the tear stitch V is the tear stitch. Acts on V. As a result, the separation between the first chamber K and the second chamber K'formed by the tear seam V is opened, and the gas released into the first chamber K passes through the exhaust port O and the airbag cover H. Can be discharged from.

FIG. 2 is an example of modification of the airbag G shown in FIG. In this case, the difference from FIG. 1 is that the chamber K'having the exhaust port O is separated from the adjacent first chamber K by a continuous tear seam V. The tear seam has ends 53 and 54, respectively, and extends from the outer edge 40 of the (flatly spread) airbag cover H to surround the exhaust port O.

FIG. 3 is another modification of the flattened airbag G shown in FIG. In this case, the difference from FIG. 1 is that two adjacent exhaust ports O are provided in the first airbag layer 1. Further, the difference from FIG. 1 is that the second chamber K'is separated from the first chamber K by three tear seams V that join the two airbag layers 1 and 2 to each other, and the two exhaust ports O. Is formed in the second chamber K'. Since two of the three tear seams V extend from the outer edge 40 of the airbag cover H and extend to both sides of the exhaust port O, the two exhaust ports O have edges between the tear seams V. It is arranged along the part 40. The third tear stitch V extends in the direction intersecting the two tear stitches V extending from the outer edge 40 as shown in FIG. 2, and the two exhaust ports O extend in the intersecting direction. It is located between the eye V and the edge 40.

Since the tear seams V extending in the intersecting direction are spaced apart from the other two tear seams V, the two chambers K and K'are before the tear seams V are split. Are already joined to each other in a gas-connected state. That is, the gas released into the first chamber K can leak from the tear seam V into the second chamber K'. The gas that has flowed into the second chamber K'when the airbag G is expanded flows out from the airbag cover H through the exhaust port O.

After the joint between the two airbag layers 1 and 2 is opened, that is, after the tear seam V is dehiscenced, the second chamber K'is gone and a given (significant) large amount of gas is exhausted. It can flow out from the airbag cover H through O.

4 to 6 show the exhaust port O as shown in FIG. 1 for airbags of various shapes. The exhaust port O having the above structure for time-controlling the exhaust of gas from the airbag cover H is all the airbags G formed by joining the two airbag layers 1 and 2 along the outer circumference. It can be used for and is advantageous.

FIG. 4 shows the airbag G as a driver airbag in a flatly spread state. The airbag G is composed of a circular first airbag layer 1 and a second airbag layer 2 jointly formed, and the airbag layers 1 and 2 are formed along the outer peripheral edges 1a and 2a by the seams 30. An airbag cover H that is joined to each other and can be filled with gas is configured. In FIG. 4, the second airbag layer 2 is covered with the first airbag layer 1 and is not visible.

Exhaust ports O are formed in the first airbag layer 1 at the two opposite portions of the outer peripheral edge portion 40 of the airbag cover H, respectively. Since the first airbag layer 1 is arranged on the side opposite to the protected driver in the vehicle-mounted state of the airbag G, the driver is not directly exposed to the high-temperature gas exhausted from the exhaust port O. ..

In order to control the opening of the two exhaust ports O for a time, the exhaust ports O are symmetrically arranged on the airbag cover H and are provided in the second chamber K'as shown in FIG.

FIG. 5 shows a head-side airbag G configured to extend from the passenger compartment in the unfolded (expanded) state, which is the front window side of the vehicle body side, that is, between the A pillar and the C pillar. Has been done. In the deployed state, the airbag G has a second chamber K'of the type shown in FIG. 1 with an exhaust port O in the region along the A pillar, and the air extending adjacent to the C pillar. In the rearmost region of the airbag cover H of the bag G, there is another second chamber K'of the species shown in FIG.

Finally, FIG. 6 shows a head-chest side airbag having a first airbag layer 1 and a second airbag layer 2 joined at the outer circumference to the first airbag layer 1 via a seam 30. A schematic plan view of airbag G is shown. The first airbag layer 1 and the second airbag layer 2 constitute an airbag cover H of an airbag G that can be filled with gas. The airbag cover H is composed of a head chamber 51 that protects the occupant's head and a chest chamber 52 that is configured to protect the occupant's chest area and is connected to the head chamber 51.

The airbag G is configured to deploy from the backrest of the seat, with the head chamber 51 located above the chest chamber 52 along the vertical axle. Therefore, both chambers 51 and 52 extend along the lateral axis of the vehicle between the side of the vehicle body and the occupant to be protected. In this case, the first airbag layer 1 is arranged so as to face the vehicle body. In order to control the exhaust of the airbag G, the chest chamber 52 is provided with an exhaust port O, which is the first airbag layer 1, that is, the airbag cover H, in order to protect the occupant from the high temperature gas. It is formed on the edge 40 of the. The exhaust port O is separated from the airbag cover H, i.e. from the first chamber K, by a tear seam V as shown in FIG.

FIG. 7 shows another embodiment together with FIG. The difference from FIGS. 1 to 6 is that the airbag cover H is not divided into chambers by the tear seam V, and further, it covers the exhaust port O formed in the first airbag layer 1. The cover element A of is provided.

With the airbag cover H shown in FIG. 7 spread flat, the first airbag layer 1 of the airbag cover H intersects the expansion surface of the airbag cover H and the second air of the airbag cover H. Facing the bag layer 2, the second airbag layer 2 is separated from the first airbag layer 1 except for the edge 40 by the expansion of the airbag G, that is, the expansion of the airbag cover H caused by the expansion.

The separation between the two opposing airbag layers 1 and 2 is readily available to control the opening of the exhaust port O, as described below. For this purpose, the exhaust port O is shielded from the external space surrounding the airbag cover H by a cover layer which is basically a triangular cover element A. Therefore, the cover element A has two edges 17, 18 extending longitudinally adjacent to each other, preferably intersecting each other. Further, the cover element A is fixedly joined to the first airbag layer 1 of the airbag cover H via the edges 17 and 18, respectively, by seams 14.

Cover element A further has an edge region 15 connecting the two edges 17, 18 to each other. The edge region 15 is not joined to the first airbag layer 1 of the airbag cover H, but defines an opening O'along with the facing region 16 of the first airbag layer 1. Therefore, the gas in the internal space of the airbag cover H flows out from the exhaust port O (unless the cover element A is in contact with the exhaust port O in a sealed manner) and covers the exhaust port O. When it hits A, it is deflected by the cover element A and flows out from the opening O'to the external space surrounding the airbag cover H.

In order to allow the cover element A covering the exhaust port O to be separated from the exhaust port O, the cover element A has a second region in which the cover element A is connected to the first region 10 and the first region 10. A crease that divides into 12 is provided along one edge 17.

In order to close the exhaust port O, the first region 10 is in contact with the edge region 11 surrounding the exhaust port O in a sealed manner. In this regard, the first region 10 of the cover element A is folded over the second region 12 of the cover element A, and the first region 10 of the cover element A is the airbag cover H having the exhaust port O. The second region 12 which is in close contact with the first airbag layer 1 and extends along the exhaust port O forms an intermediate layer. In order to fix the first position of such a cover element A before the expansion of the airbag G, the cover element A and the first airbag layer 1 are joined, and the first airbag layer 1 and the second airbag are joined. A tear seam V that joins the layer 2 is provided on the cover element A. Further, the tear seam V joins the first region 10 and the second region 12 of the cover element A, and the space position of the crease 20 is fixed with respect to the exhaust port O, that is, the cover element A. The first region 10 of the above is fixed so as to be in close contact with the edge region 11 that defines the exhaust port O and close the exhaust port O.

When the airbag cover H is filled with gas, the two airbag layers 1 and 2 of the airbag cover H are pushed apart from each other, so that a force is applied to the tear seam V and the tear seam V is destroyed. .. As a result, the first region 10 of the cover element A is pushed away from the edge region 11 of the exhaust port O by the gas flow from the internal space of the airbag cover H toward the first region 10 of the cover element A. At this time, the first region 10 which was in close contact was curved due to the provision of the crease 20, and the opening O'which was closed at the first position by the two edge regions 15 and 16. To open. The gas that has flowed out from the exhaust port O can flow out from the opening O'toward the external space of the airbag cover H.

By stabilizing the relative spatial positions of the two airbag layers 1 and 2 by the joining means V, the airbag cover H is the airbag G without basically impairing the opening reproducibility of the exhaust port O. It is possible to fold it arbitrarily before it expands. In the embodiment shown in FIGS. 7 and 8, the exhaust port O is formed in the vicinity of the outer peripheral edge portion 1a of the first airbag layer 1. Thus, if the gas generator is a rotationally symmetric driver airbag (see Figure 4) that is typically centered with respect to the two airbag layers 1 and 2, the airbag cover H will be the first. Since the central portion expands toward the edges 1a and 2a, the opening of the exhaust port O can be relatively delayed.

FIG. 9 is an example of modification of the cover layer A shown in FIGS. 7 and 8. The difference from FIG. 7 or FIG. 8 is that the cover layer A is formed in a strip shape (rectangle) instead of a triangle. The strip-shaped cover layer A is joined to the first airbag layer 1 via two opposing edges 117,118 on both sides of the exhaust port O, and has two opposing edge regions 15,115 in the direction along the edges 117,118. Have. The edge regions 15,115, along with the opposing edge regions 16,116, define two opposing openings O'. As a result, the gas exhausted from the exhaust port O flows out from the two openings O'in two directions opposite to each other through the cover element A and the first airbag layer 1. The crease 20 and the tear seam V are formed along one of the two edges 117, 118 of the cover layer A.

FIG. 10 shows the type of airbag G shown in FIG. 6, together with FIGS. 11 to 13. The chest chamber 52, i.e., the first airbag layer 1 adjacent to the outer edge 40 of the airbag cover H, is formed with two exhaust ports O covered by the cover element A of the type shown in FIGS. 7 and 8. Has been done.

Two exhaust ports P are also formed adjacent to each other in the second airbag layer 2. When the airbag cover H is spread flat, the two exhaust ports O formed in the first airbag layer 1 are arranged so as to match the exhaust ports P formed in the second airbag layer 2, respectively. There is.

The cover element A provided on the first airbag layer 1 functions to close the exhaust port O and protects the occupant facing the first airbag layer 1. That is, the outflow direction of the gas flowing out from the exhaust port O is deflected by the cover layer A so that the high temperature gas flow flowing out from the airbag cover H does not hit the occupant. Since the second airbag layer 2 of the airbag cover H is located on the opposite side of the occupant in the gas holding state, it is necessary to provide the cover element A in the second airbag layer 2 in order to cover the exhaust port P. There is no.

Further, by providing the exhaust port P in the second airbag layer 2, the first and second airbag layers 1 and 2 can be configured as common parts, so that the airbag G can be easily manufactured.

Further, the airbag G shown in FIGS. 10 to 13 is different from the airbag G shown in FIGS. 7 and 8 in that another tear stitch V is provided on the cover layer A. A second chamber K'of the type shown in FIG. 1 is formed along the edge 18 that forms an acute angle with the fissure V and has exhaust ports O and P. The difference from FIG. 1 is that the two tear seams V do not intersect and form a gap between the free ends 61, 62 opposite the edge 40, ie the two airbag layers 1, The point is that a discontinuity is formed at the openable joint between the two. The gas released into the first chamber K already flows out into the second chamber K'through the gap before the tear seam V is dehiscenced, and passes through the exhaust ports O and P to cover the airbag. It is said that it can be discharged from H.

When the airbag G is inflated, the airbag cover H is inflated, and as a result, the tear seam V is dehiscenced, so that the second chamber K'is fully opened and the cover element A is opened. Is pressurized by the outflowing gas and moves to a curved second position. As a result, the amount of gas flowing out from the exhaust ports O and P per unit time increases considerably.

<u style="single">In the present invention, "the airbag according to any one of claims 1 to 3, wherein the joining means (V) has the two airbag layers (1, 2) as the airbag cover (H). ), The airbag is characterized in that the two airbag layers (1, 2) are joined so as to form the first chamber (K) and the adjacent second chamber (K'). " (Aspect 1) can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to the first aspect, wherein the airbag (G) is configured to be filled with gas through the first chamber (K). (Aspect 2) can be adopted.</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 1 or 2, the exhaust port (O) is formed in the second chamber (K'), and the space between the airbag layers (1, 2) is formed. An aspect (aspect 3) of an airbag characterized in that the outflow of gas from the exhaust port (O) to the outside of the airbag (G) is prevented or restricted by the openable joint of the airbag. ..</u><u style="single">Further, in the present invention, "the airbag according to any one of the first to third aspects, wherein the first chamber (K) has a larger volume than the second chamber (K'). The aspect of "bag" (aspect 4) can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of the first to fourth aspects, the openable joint formed by the joint means (V) has a discontinuous portion, and the gas is released. Before opening the joint, the first chamber (K) can flow out of the airbag (G) from the exhaust port (O) through the second chamber (K'). An aspect (aspect 5) of "an airbag characterized by being configured" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of claims 1 to 3 and the above aspects 1 to 5, wherein the openable joint portion formed by the joint means (V) is in an expanded state. The amount of gas flowing out from the exhaust port (O) per unit time is configured to increase by a predetermined amount after the joint is opened, as compared with before the joint is opened. The aspect of "bag" (aspect 6) can be adopted.</u><u style="single">Further, in the present invention, "the air bag according to any one of the first aspect or the first aspect 2 to 6 according to the first aspect, and the openable joint portion formed by the joining means (V). Is configured to separate the first chamber (K) and the second chamber (K') so that gas does not flow out of the exhaust port (O) before opening the joint. The aspect (aspect 7) of "an airbag characterized by the above" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 1, claims 4 and 5, wherein the second chamber (K') is the first and second airbag layers (1, 2). ) The airbag characterized by having a part of each of the outer edge portions (1a, 2a) (Aspect 8) can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of claims 1 to 7 and the above aspects 1 to 8, wherein the joining means (V) joins the two airbag layers (1, 2). It is composed of at least one tear seam, and the tear seam is configured to tear by applying a predetermined force so that the joint portion of the two airbag layers (1, 2) is opened. , The airbag is characterized in that, in a state where the two airbag layers (1, 2) are spread flat, the at least one tear seam at least partially surrounds the exhaust port (O). " Aspects (Aspect 9) can be taken.</u><u style="single">Further, in the present invention, "the airbag according to claim 1, claim 3, or aspect 9, wherein at least one tear seam has two free ends (53,54) of the airbag. An aspect (aspect 10) of an airbag characterized in that it extends to the outer edge portion (40) of the bag cover (H) can be adopted.</u>

<u style="single">Further, in the present invention, "the airbag according to claim 1 or 3, wherein the joining means (V) extends from the outer edge portion (40) of the airbag cover (H), and has an acute angle with each other. An aspect (aspect 11) of "an airbag characterized in that it is composed of two tear stitches formed" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to claim 1 or 3, wherein the joining means (V) includes two tear stitches extending from the outer edge portion (40) of the airbag cover, and the said. An aspect (aspect 12) of "an airbag characterized in that it is composed of the two tear stitches extending from the outer edge portion (40) and one tear stitch extending in a direction intersecting the two tear stitches" can be adopted. ..</u><u style="single">Further, in the present invention, "the airbag according to any one of claims 1 to 8 and aspects 1 to 12 is provided with a cover element (A) covering the exhaust port (O), and the joint is provided. In the means (V), the cover element (A) and the first airbag layer (1) are openly joined so that the cover element (A) abuts on the exhaust port (O). The joining means (V) is configured to open the cover element (A) when the airbag (G) expands, and opens the exhaust port (O) by opening the openable joint. The open joint between the cover element (A) and the first airbag layer (1) is configured such that gas can flow out from the exhaust port (O), and the two airbag layers ( An aspect of "an airbag characterized in that 1, 2) is moved in a direction away from each other when the airbag (G) is expanded, so that the airbag (V) is released when a predetermined force is applied to the joining means (V)." Aspect 13) can be adopted.</u><u style="single">Further, in the present invention, "in the airbag according to the thirteenth aspect, the cover element (A) covers the exhaust port (O) in a thin layer before expansion, so that the cover element (A) ) Can adopt the aspect (aspect 14) of "an airbag characterized in that it is pressurized with a gas when the airbag (G) is expanded".</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 13 or 14, the cover element (A) is configured to deflect the outflow direction of the gas discharged from the exhaust port (O). An aspect (aspect 15) of "an airbag characterized by being in the air" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 13 to 15, wherein the cover element (A) is pressurized with a gas after the cover element (A) is opened. From the first position for closing the exhaust port (O), the gas is arranged with respect to the exhaust port (O) so that the gas can flow out from the airbag (G) through the exhaust port (O). An aspect (aspect 16) of "an airbag characterized in that it is configured to be moved to two positions" can be adopted.</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 16, the cover element (A) is the exhaust in which the first region (10) defines the exhaust port (O) in the first position. An aspect (aspect 17) of "an airbag characterized in contact with the edge region (11) of the mouth (O)" can be adopted.</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 16 or 17, the cover element (A) has the first region (10) of the cover element (A) at the second position. An aspect (aspect 18) of "an airbag characterized by having a bulge so as to be arranged in front of the exhaust port (O) at a distance from the exhaust port (O)" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to the aspect 18 is characterized in that the cover element (A) has a crease (20) for forming the bulge portion at the first position. It is possible to adopt the aspect (aspect 19) of "airbag to be used".</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 19, at the first position, the cover element (A) is formed into the first region (10) and the first region by the crease (20). An aspect (aspect 20) of "an airbag characterized by being divided into a second region (12) connected to (10)" can be adopted.</u>

<u style="single">Further, in the present invention, "when the airbag according to any one of the 16th to 20th aspects is in the first position before the cover element (A) is opened, the crease (20) is formed. The first region (10) is fixed to the first airbag layer (1) by the joining means (V) so as to be in close contact with the edge region (11) of the exhaust port (O). The two regions (12) can adopt an aspect (aspect 21) of "an airbag characterized in that it is arranged between the first region (10) and the first airbag layer (1)".</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 13 to 21, wherein the cover element (A) is the first airbag layer (1st airbag layer) by another joining means (14), particularly a seam. An aspect (aspect 22) of "an airbag characterized by having an outer peripheral edge portion (13) joined to 1) can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 16 to 21 or the said aspect 22 and formed by the other joining means (14) has a discontinuous portion. The cover layer (A) and the airbag layer (1) are respectively configured to form edge regions (15, 16) of the opening (O'), and the cover element (A) is the cover element (A). When in the first position, the two edge regions (15, 16) may be in contact with each other in an "airbag" aspect (aspect 23).</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 23, the joint portion formed by the other joint means (14) has another discontinuity and is in contact with the cover element (A). The first airbag layer (1) is configured to form another edge region (115,116) of another opening (O'), respectively, and the cover element (A) is in the first position. In some cases, the "airbag" aspect (aspect 24), wherein the two separate edge regions (115,116) are in contact with each other can be taken.</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 24, the opening (O') and the other opening (O') are in a state in which the airbag cover (H) is spread flat. Therefore, an aspect (aspect 25) of "airbags characterized in that they are aligned with each other" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 22 to 25, wherein the other joining means (14) is an edge portion of the cover element (A) extending in two longitudinal directions. An aspect (aspect 26) of "an airbag characterized in that the cover element (A) is joined to the first airbag layer (1) via (17,18; 117,118)" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of the aspect 26, the aspect 19, or the aspect 20 to 25 according to the aspect 19, and the crease (20) is the two edges. An aspect (aspect 27) of "an airbag characterized in extending along one of (17,18; 117,118)" can be taken.</u><u style="single">Further, in the present invention, "the airbag according to the aspect 26 or 27, characterized in that the two longitudinally extending edges (17, 18) of the cover element (A) are adjacent to each other. (Aspect 28) can be adopted.</u><u style="single">Further, in the present invention, the aspect of "the airbag according to any one of the above aspects 13 to 28, wherein the cover element (A) is formed in a triangular shape" ( Aspect 29) can be adopted.</u><u style="single">Further, in the present invention, "in the airbag according to the aspect 26 or 27, the two longitudinally extending edges (117, 118) of the cover element (A) are arranged so as to face each other. An aspect (aspect 30) of "an airbag characterized by the above" can be adopted.</u>

<u style="single">Further, in the present invention, it is referred to as "an airbag according to any one of the above aspects 13 to 27 or the said aspect 30 in which the cover element (A) is formed in a band shape". Aspects (Aspect 31) can be taken.</u><u style="single">Further, in the present invention, "claim 1, or any one of claims 8 according to claim 1, said aspects 1 to 12, or said aspect 13 or said aspect 14 to 31 according to said aspect 13". Aspect (aspect 32) of the airbag described, wherein the at least one tear stitch (V) is applied from above the cover element (A).</u><u style="single">Further, in the present invention, "in the airbag according to any one of the above aspects 17 to 21 or the said aspect 32, the tear seam (V) is the second region (12) of the cover element (A). ) To fix the first region (10), which is an embodiment (aspect 33).</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 13 to 33, wherein the cover element (A) is particularly made of an airbag fabric so as to have flexibility. An aspect (aspect 34) of "an airbag characterized by the above" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to claim 8 or any one of the aspects 13 to 34 according to claim 8, wherein the second airbag layer (2) has (the above 2). (For a state in which one airbag layer (1, 2) is spread flat) An exhaust port (P) is formed so as to be combined with the exhaust port (O) provided in the first airbag layer (1). A mode (aspect 35) of "characterized airbag" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of claims 1 to 8 and aspects 1 to 35, wherein the airbag cover (H) is provided on the first airbag layer (1). An aspect (aspect 36) of "an airbag characterized by having another exhaust port (O) formed in the first airbag layer (1) adjacent to the exhaust port (O)" can be adopted. ..</u><u style="single">Further, in the present invention, "the airbag according to any one of the above aspects 36 and 13, or the said aspect 14 to 35 with reference to the said aspect 13, and the cover element (A) is the said first (1) An aspect (aspect 37) of "an airbag characterized in that it is configured to cover the other exhaust port (O) formed in the airbag layer (1)" can be adopted.</u><u style="single">Further, in the present invention, "the airbag according to any one of claims 1 to 8 and aspects 1 to 37, wherein the first airbag layer (1) constitutes an impact surface for a protected occupant. It is possible to adopt an aspect (aspect 38) of "an airbag characterized by the above".</u><u style="single">Further, in the present invention, "the airbag according to any one of claims 1 to 8 and the above aspects 1 to 38, wherein the airbag is a driver airbag, a passenger seat airbag and a side airbag. An aspect (aspect 39) of "an airbag characterized by being configured as either" can be adopted.</u>

<figref num="1">FIG. 6 is a schematic and fragmentary plan view showing a flattened airbag with an exhaust area closed by a tear seam.</figref><figref num="2">It is a schematic and fragmentary plan view which shows the modification example of the airbag shown in FIG.</figref><figref num="3">FIG. 3 is a schematic and fragmentary plan view showing another example of modification of the airbag shown in FIG.</figref><figref num="4">FIG. 3 is a schematic plan view showing an airbag as a driver airbag having two exhaust ports of the type shown in FIG.</figref><figref num="5">It is a schematic plan view which shows the airbag as a head side airbag which has two exhaust ports of the kind shown in FIG.</figref><figref num="6">FIG. 5 is a schematic plan view showing an airbag as a head-chest side airbag having two exhaust ports as shown in FIG.</figref><figref num="7">FIG. 6 is a schematic and fragmentary plan view showing a flattened airbag with an exhaust port covered by a cover layer, which is a cover element.</figref><figref num="8">It is a fragment perspective view which shows the airbag shown in FIG. 1 which has a curved cover element which opens an exhaust port.</figref><figref num="9">It is a schematic and fragmentary plan view which shows the modification example of the airbag shown in FIG. 7 or FIG.</figref><figref num="10">A plane showing the first airbag layer (impact surface) of a flattened airbag of the type shown in FIG. 6 having an exhaust port formed in the chamber of the airbag cover and covered with a cover element. It is a figure. In this case, the chambers are formed by the area of the airbag cover and are joined together by tear seams.</figref><figref num="11">It is a detailed view of the figure shown in FIG.</figref><figref num="12">It is a rear view of the airbag shown in FIG.</figref><figref num="13">It is a detailed view of the figure shown in FIG.</figref>