JP7184590B2 - side airbag device - Google Patents

Description

The present invention relates to a side airbag device. More specifically, the present invention relates to a side airbag device that inflates and deploys in the event of a side collision of a vehicle such as an automobile to protect an occupant.

In order to protect the side of the occupant from the side wall of the vehicle that intrudes into the vehicle in the event of a side collision, the side airbag device is inflated by introducing gas into the side airbag. It is a device that deploys to the side.

For example, Patent Document 1 discloses a side airbag designed to efficiently move an occupant to the inside of a vehicle by an inflated portion of an airbag in response to an impact during a side collision of the vehicle, thereby improving occupant protection performance. A bag device is disclosed. In this side airbag device, a dividing member that divides the inflatable portion of the airbag into an upstream inflatable portion and a downstream inflatable portion is provided with a pressure regulating valve that regulates or permits the flow of gas. In the event of a side collision of the vehicle, when gas is generated from the inflator arranged in the upstream inflation portion, only the upstream inflation portion is inflated because the pressure regulating valve is closed, and the rear portion of the airbag is put into a high pressure state. At the initial stage of inflation and deployment of the airbag, the rear portion of the airbag protects the back (rear portion of the torso), which is a relatively strong portion of the torso of the occupant. It is designed to withstand the impact from Thereafter, the upstream inflation portion is crushed to open the pressure regulating valve, thereby allowing gas to flow from the upstream inflation portion (rear portion of the airbag) to the downstream inflation portion (front portion of the airbag), The downstream expansion section also expands to protect the entire torso of the occupant.

JP 2013-159304 A

Considering actual collision accidents, when the side collision speed of the vehicle is high and the collision energy is large, the impact from the side wall of the vehicle cannot be completely absorbed by the initial expansion and deployment of the airbags, and the internal pressure of the airbags is maintained for a long time. had to be raised to On the other hand, in the side airbag device described in Patent Document 1, at the initial stage of inflation and deployment of the airbag, the internal pressure of only the rear portion (upstream inflation portion) of the airbag is increased to protect the occupant's back. Was. However, as the inflation and deployment of the airbag progresses further, the internal pressure of the front portion (downstream inflation portion) of the airbag increases to absorb the impact from the vehicle side wall. There was a concern that the reaction force from the crushed airbag would be applied to the chest (the front part of the torso), which is a vulnerable part, and that the occupant would not be properly protected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned current situation. It is an object of the present invention to provide a side airbag device capable of adequate protection.

One aspect of the present invention includes an inflator that generates gas, and a vehicle side wall side of an occupant seated on the vehicle seat by the gas when the inflator is activated. a side airbag that inflates and deploys to protect the sides of the occupant, the side airbag includes an outer bag and the inflator, and the seat back extends behind the outer bag. an inner bag arranged along a direction, wherein the outer bag is provided with a vent hole communicating with the outside, the inner bag is provided with a gas flow hole communicating with the outer bag, In the side airbag device, the gas flow hole is provided at a position that is closed by the outer bag when the side airbag in an inflated and deployed state is crushed between the occupant and the side wall of the vehicle. .

ADVANTAGE OF THE INVENTION According to the present invention, in the event of a side collision of a vehicle, even if the side collision speed of the vehicle is high and the collision energy is large, the side air can appropriately protect the occupant without applying a large impact to the occupant's chest. A bag device can be provided.

1A and 1B are schematic diagrams showing a state of the side airbag device before inflation and deployment of the side airbag device of Embodiment 1, where (a) shows the state seen from the side, and (b) shows the state seen from above. . FIG. 4 is a schematic diagram showing the initial state of restraining the occupant by the side airbag of the side airbag device of Embodiment 1, where (a) shows the state viewed from the side, and (b) shows the state viewed from above. . It is a cross-sectional schematic diagram showing a portion corresponding to the line segment in FIG. shows a cross section of the part where FIG. 4 is a schematic plan view showing a base fabric constituting the outer base fabric in FIGS. 2 and 3; FIG. 4 is a schematic plan view showing a base fabric constituting the inner base fabric in FIGS. 2 and 3; FIG. 4 is a schematic diagram showing the state of the side airbag device of Embodiment 1 in the middle stage of restraining the occupant by the side airbag, (a) showing the state viewed from the side, and (b) showing the state viewed from above. . FIG. 6A is a schematic cross-sectional view showing a portion corresponding to the line segment in FIG. 6A, where (a) shows a cross section of a portion corresponding to the line segment A3-A4, and (b) corresponds to the line segment B3-B4. shows a cross section of the part where 2A is a schematic diagram showing a state of restraining an occupant by a side airbag in a side airbag device of Modification 1 of Embodiment 1, FIG. -B2, and (b) shows a cross section of a portion corresponding to line segment B3-B4 in FIG. FIG. 2A is a schematic diagram showing an occupant restraint state by a side airbag in a side airbag device of Modification 2 of Embodiment 1, and FIG. -B2, and (b) shows a cross section of a portion corresponding to line segment B3-B4 in FIG. FIG. 4 is a schematic diagram showing the state of the side airbag device of Embodiment 1 in the latter stage of restraining the occupant by the side airbag, where (a) shows the state seen from the side, and (b) shows the state seen from above. . FIG. 8 is a schematic diagram showing the initial state of restraining the occupant by the side airbag of the side airbag device of Embodiment 2, where (a) shows the state seen from the side and (b) shows the state seen from above. . FIG. 11(a) is a schematic cross-sectional view showing a portion corresponding to a line segment in FIG. 11(a), (a) showing a cross section of a portion corresponding to the line segment A1-A2, and (b) corresponding to the line segment B1-B2. shows a cross section of the part where FIG. 13 is a schematic plan view showing the partition-like base fabric in FIGS. 11 and 12; FIG. 10 is a schematic diagram showing the state of the side airbag device of Embodiment 2 in the middle stage of restraining the occupant by the side airbag, where (a) shows the state seen from the side and (b) shows the state seen from above. . FIG. 14 is a schematic cross-sectional view showing a portion corresponding to the line segment in FIG. 14(a), (a) showing the cross section of the portion corresponding to the line segment A3-A4, and (b) corresponding to the line segment B3-B4. shows a cross section of the part where FIG. 8A is a schematic diagram showing the state of the side airbag device of Embodiment 2 in the latter stage of restraining the occupant by the side airbag, (a) showing the state seen from the side, and (b) showing the state seen from above. . FIG. 11 is a schematic diagram showing a middle-term state of restraining an occupant by a side airbag when a WS50-type internationally standardized side impact dummy is seated on a vehicle seat with respect to the side airbag device of Embodiment 3; FIG. 12 is a schematic diagram showing a middle stage of restraining the occupant by the side airbag when the WS5 internationally standardized side impact dummy is seated on the vehicle seat with respect to the side airbag device of Embodiment 3; FIG. 10 is a schematic diagram for explaining preferred positions of gas adjustment holes and gas circulation holes in the side airbag device of Embodiment 3; FIG. 19 is a schematic cross-sectional view showing a portion corresponding to a line segment A3-A4 in FIGS. 17 and 18;

[Embodiment 1]
The side airbag device of Embodiment 1 will be described below with reference to the drawings, focusing on the inflation and deployment behavior of the side airbag. Descriptions of directions in this specification are based on the vehicle, unless otherwise specified. indicates the upward direction of the vehicle, "downward" indicates the downward direction of the vehicle, and "lateral" indicates the outward direction in the width direction of the vehicle. Further, an arrow FR appropriately shown in each figure indicates the front direction of the vehicle, an arrow UP indicates the upward direction of the vehicle, and an arrow OUT indicates the outward direction in the width direction of the vehicle. It should be noted that members arranged inside the vehicle seat are illustrated in a state in which the vehicle seat is seen through.

(Before expansion and deployment)
1A and 1B are schematic diagrams showing the state of the side airbag device before inflation and deployment of the side airbag device according to the first embodiment, FIG. state.

As shown in FIGS. 1(a) and 1(b), the side airbag device 1 is attached to the side portion (the side portion on the side of the side wall 50 of the vehicle) of the seat back (backrest portion) 31 of the vehicle seat 30. .

As the vehicle seat 30, for example, a driver's seat and a passenger's seat of a vehicle are assumed.

In this embodiment, an internationally standardized side impact dummy (World-SID: World Side Impact Dummy) 40 is seated on the vehicle seat 30 . The seating posture of the internationally standardized side impact dummy 40 is currently stipulated by the side impact test method (ECE R95) adopted in Japan and Europe, or the side impact test method (FMVSS214) adopted in the United States. is. The position and size of the side airbag 20 at the time of inflation and deployment are the chest 41, upper arm 42, shoulder 43, abdomen 44, back 45, and 45 of the internationally standardized side impact dummy 40 as shown in FIG. It is set according to the position of the waist 46 . The internationally standardized side impact dummy 40 is hereinafter referred to as "occupant 40".

The vehicle side wall 50 is not particularly limited as long as it is a portion of the vehicle body positioned to the side of the occupant 40 seated on the vehicle seat 30, and includes a side door, a pillar, a side window, and the like.

As shown in FIG. 1(a), the side airbag device 1 has a bag-like side airbag 20 folded to be inflatable and deployable, and an inflator 10 arranged inside the side airbag 20. ing.

Before being inflated and deployed, the side airbag 20 is fixed in a folded state to the side portion of the side frame 33 located on the side portion of the seat back 31, and is covered with the skin 32 of the seat back 31 together with the cushion pad 34 for storage. It is

The inflator 10 is a cylindrical (columnar) gas generator, and is arranged along the extending direction (height direction) of the seat back 31 . A pair of bolts 11 protrude from the upper and lower portions of the inflator 10 and pass through the side airbag 20 . The inflator 10 is attached to the side frame 33 of the seat back 31 by such a pair of bolts 11. As shown in FIG.

The inflator 10 is activated during a side collision of the vehicle. Specifically, first, when a collision detection sensor mounted on the vehicle detects a side collision of the vehicle, an ECU (Engine Control Unit) calculates the signal sent from the collision detection sensor and determines the level of the collision. . When the determined collision level corresponds to the case of inflating the side airbag 20, the inflator 10 is ignited and gas is generated by a chemical reaction due to combustion. As a result, gas generated from the inflator 10 is introduced into the side airbag 20 .

The type of the inflator 10 is not particularly limited, and includes, for example, a pyro-type inflator using gas generated by burning a gas generating agent, a stored type inflator using compressed gas, and a gas generated by burning a gas generating agent. and a hybrid inflator using a mixed gas of air and compressed gas.

(Early stage of occupant restraint)
2A and 2B are schematic diagrams showing the initial state of restraining the occupant by the side airbag in the side airbag device of Embodiment 1, where (a) shows the state viewed from the side, and (b) shows the state viewed from above. state. FIG. 3 is a schematic cross-sectional view showing a portion corresponding to the line segment in FIG. - shows a cross-section of the part corresponding to B2.

When the vehicle side-collides with an obstacle 60 (for example, another vehicle) and the inflator 10 is activated, the gas generated by the inflator 10 is introduced into the side airbag 20, and the side airbag 20 is unfolded. It expands while he is. When the skin 32 of the seat back 31 is ruptured by the force applied from the inflated side airbag 20, the side airbag 20 moves toward the vehicle side wall 50 of the occupant 40 as shown in FIGS. Inflate and deploy (full deployment). 2(a) and 2(b) schematically show the state after 5 to 15 ms from the start of operation of the inflator 10. FIG.

Here, the side airbag 20 includes an outer bag 21, an inner bag 23 that encloses the inflator 10 and is arranged in the rear portion of the outer bag 21 along the extending direction (height direction) of the seat back 31, have. The outer bag 21 is provided with a vent hole 22 communicating with the outside. The inner bag 23 is provided with a gas flow hole 24 that communicates with the outer bag 21 . The outer bag 21 and the inner bag 23 are folded together and fixed to the side portion of the side frame 33 located on the side portion of the seat back 31 before being inflated and deployed.

In the present embodiment, since the side airbag 20 has the configuration described above, when the vehicle collides with the obstacle 60 from the side and the inflator 10 is activated, the gas generated from the inflator 10 is released into the inner bag 23 first. , and the inner bag 23 expands while being unfolded. At the same time, gas is introduced into the outer bag 21 through the gas flow holes 24 provided in the inner bag 23, and the outer bag 21 expands while being unfolded. When the skin 32 of the seat back 31 is torn by the force applied from the inflated outer bag 21, the space between the occupant 40 seated on the vehicle seat 30 and the vehicle side wall 50 deformed and displaced toward the occupant 40 due to the side collision, That is, the side airbag 20 is inflated and deployed toward the vehicle side wall 50 of the occupant 40 . As a result, as shown in FIGS. 2A and 2B, the inflated and deployed side airbag 20 is arranged so as to overlap the sides of the chest 41 and back 45 of the occupant 40 (sides on the vehicle side wall 50 side). , protect the sides of the occupant 40 .

At the initial stage of occupant restraint by the side airbag 20 as described above (the period from the initial stage of inflation and deployment of the side airbag 20 to full deployment), the inner bag 23 is arranged behind the outer bag 21, so the inflation The thickness of the expanded outer bag 21 in the vehicle width direction becomes larger than the thickness of the inflated inner bag 23 in the vehicle width direction. Therefore, as shown in FIG. 3B, a gap is formed between the gas flow hole 24 provided in the inner bag 23 and the outer bag 21, and gas flows smoothly from the inner bag 23 to the outer bag 21. The outer bag 21 can be inflated and deployed without delay. Thus, in the early stage of occupant restraint, the entire torso (chest 41, back 45, etc.) of the occupant 40 is protected by the soft outer bag 21, which does not increase the internal pressure too much due to expansion while being unfolded.

When the outer bag 21 is inflated and deployed, the gas generated by the inflator 10 is introduced into the outer bag 21 from the inner bag 23 through the gas flow holes 24 , while the gas inside the outer bag 21 is released from the vent holes 22 . It is discharged outside. Therefore, the amount of gas introduced into the outer bag 21 is made larger than the amount of gas discharged from the outer bag 21, and from the viewpoint of reliably inflating and deploying the outer bag 21, as shown in FIG. , it is preferable that the opening area of the gas communication hole 24 is larger than the opening area of the vent hole 22 .

As shown in FIGS. 3(a) and 3(b) (FIG. 2(a)), the outer bag 21 is composed of an outer base cloth 25A. The outer base fabric 25A is formed in a bag shape by joining the base fabrics 25a, 25b, and 25c as shown in FIG. FIG. 4 is a schematic plan view showing a base fabric that constitutes the outer base fabric in FIGS. The outer base fabric 25A may be formed into a bag shape by folding one base fabric in two and joining the outer periphery of the folded fabric.

As shown in FIGS. 3(a) and 3(b) (FIG. 2(a)), the inner bag 23 is composed of an inner base cloth 25B. The inner base cloth 25B is formed into a bag shape by folding the base cloth 25d shown in FIG. . FIG. 5 is a schematic plan view showing a base fabric that constitutes the inner base fabric in FIGS. The inner base fabric 25B may be formed into a bag shape by joining the outer peripheries of a plurality of base fabrics.

As shown in FIGS. 3(a) and 3(b) (FIG. 2(a)), the inner bag 23 is arranged inside the outer bag 21, and the end portion (peripheral portion) thereof constitutes the outer bag 21. It is composed of a bag-shaped inner base fabric 25B that is joined together with a part of the end portion (peripheral portion) of 25A. Specifically, as shown in FIGS. 4 and 5, a part of the end portion of the outer base fabric 25A composed of the base fabrics 25a, 25b, and 25c and the end of the inner base fabric 25B composed of the base fabric 25d The joint portion 27a (a part of the outer peripheral joint portion 26a and the outer peripheral joint portion 26b) is formed so that the mark X1 and the mark Y1 overlap, the mark X2 and the mark Y2 overlap, and the mark X3 and the mark Y3 overlap. (also serves as a joint). As a result, a state is obtained in which the inner bag 23 is arranged in the rear portion within the outer bag 21 . The outer peripheral joint portion 26a and the joint portion 27a define the shape of the outer edge of the outer bag 21 when it is inflated and deployed. The peripheral joint portion 26b and the joint portion 27a define the shape of the outer edge of the inner bag 23 when it is inflated and deployed.

As the base fabrics 25a, 25b, 25c, and 25d, for example, fabrics woven with threads such as nylon 66 and polyethylene terephthalate (PET) are used. The surfaces of the base fabrics 25a, 25b, 25c, and 25d may be coated with an inorganic material such as silicon in order to improve heat resistance and airtightness.

A joining method for forming the outer bag 21 and the inner bag 23 is not particularly limited, and examples thereof include sewing, adhesion, welding, and combinations thereof.

(Occupant restraint middle term)
6A and 6B are schematic diagrams showing the state of the side airbag device of Embodiment 1 in the middle stage of restraining the occupant by the side airbag, where (a) shows the state viewed from the side, and (b) shows the state viewed from above. state. FIG. 7 is a schematic cross-sectional view showing a portion corresponding to the line segment in FIG. - shows a cross-section of the part corresponding to B4. 6(a) and 6(b) schematically show the state 15 to 25 ms after the start of operation of the inflator 10. FIG.

When the amount of displacement of the vehicle side wall 50 due to a side collision increases and the distance between the occupant 40 and the vehicle side wall 50 becomes narrower than in the state shown in FIG. The outer bag 21 of the side airbag 20 is crushed between the occupant 40 and the side wall 50 of the vehicle. At this time, as shown in FIG. 7B, the crushed outer bag 21 closes the gas flow hole 24 provided in the inner bag 23 . As a result, the outflow of gas from the inner bag 23 to the outer bag 21 is blocked, so the internal pressure of the inner bag 23 is maintained high. On the other hand, since the outer bag 21 is provided with the vent hole 22 communicating with the outside, the gas in the outer bag 21 is discharged to the outside through the vent hole 22 when the outer bag 21 is crushed. As a result, the outer bag 21 is in a soft state with an appropriately adjusted internal pressure.

Therefore, in the middle period of restraining the occupant by the side airbag 20 as described above, an internal pressure difference is generated between the inner bag 23 and the outer bag 21, and a relatively fragile portion of the torso of the occupant 40 is affected. A certain chest 41 is protected by the outer bag 21 in a soft state, while the back 45, which is a relatively strong part of the torso of the occupant 40, is protected by the inner bag 23 whose internal pressure is kept high. . At this time, as shown in FIG. 6A, the inner bag 23 is arranged along the extending direction (height direction) of the seat back 31, that is, along the back 45 of the occupant 40. The back 45 can be reliably protected.

The gas flow hole 24 is positioned to be blocked by the outer bag 21 when the inflated and deployed side airbag 20 (outer bag 21) is crushed between the occupant 40 and the vehicle side wall 50 after a side collision of the vehicle. is provided in Here, the "position blocked by the outer bag 21" in the inner bag 23 means that the side airbag 20 ( It refers to a position in the inner bag 23 that contacts the outer bag 21 when the outer bag 21) is crushed, for example, the front portion 28 of the inner bag 23 (the front portion of the outer bag 21) as shown in FIG. 7(b). It refers to a position other than the part facing the part). The timing at which the gas flow hole 24 is closed by the outer bag 21 is, for example, 15 ms after the start of operation of the inflator 10 .

As shown in FIGS. 6(a) and 7(b), the gas flow hole 24 is preferably provided in the central portion or rearward of the central portion in the front-rear direction of the inner bag 23. As shown in FIGS. As a result, when the outer bag 21 is crushed, the gas circulation holes 24 are likely to come into contact with the outer bag 21 , so that the gas circulation holes 24 can be efficiently blocked by the outer bag 21 . Here, the closer the position of the gas circulation hole 24 is to the central portion of the inner bag 23, the more gas flows from the inner bag 23 to the outer bag 21 at the initial stage of occupant restraint (before the gas circulation hole 24 is blocked by the outer bag 21). As a result, the outer bag 21 is inflated and deployed more quickly toward the vehicle side wall 50 of the occupant 40 , so that the occupant 40 can be reliably protected by the outer bag 21 . On the other hand, the closer the position of the gas circulation hole 24 is to the rear part of the inner bag 23, the easier it is for the gas circulation hole 24 to come into contact with the outer bag 21 when the outer bag 21 is crushed during the middle stage of restraining the occupant. The outer bag 21 can more efficiently block the gas flow holes 24 .

As shown in FIGS. 6( a ) and 7 ( b ), it is preferable that the gas flow hole 24 is provided in the lower portion of the inner bag 23 . As a result, the gas flow hole 24 is provided in the vicinity of the waist portion 46 (including the side surface of the back portion 45 (the side surface on the vehicle side wall 50 side)) of the torso portion of the occupant 40 whose position is difficult to change depending on the body shape. When the outer bag 21 is crushed, the gas flow hole 24 can be reliably closed by the outer bag 21 regardless of the body shape of the occupant 40 .

As shown in FIG. 7(b), it is preferable that the gas flow hole 24 is provided on the inner bag 23 on the occupant 40 side. Since the degree of crushing of the outer bag 21 by the occupant 40 does not easily change depending on the position, when the gas circulation hole 24 is provided in the inner bag 23 on the side of the occupant 40, the gas circulation hole 24 is sufficiently close to the outer bag 21. can be contacted. Therefore, the outer bag 21 can reliably block the gas flow hole 24 .

As a modified example 1 of the present embodiment, the gas flow hole 24 may be provided on the inner bag 23 on the vehicle side wall 50 side. 8A and 8B are schematic diagrams showing an occupant restraining state by the side airbag in the side airbag device of Modification 1 of Embodiment 1. FIG. 6(b) shows a cross section of a portion corresponding to line segment B3-B4 in FIG. 6(a) in the middle stage of occupant restraint. The surface of the vehicle side wall 50 facing the occupant 40 may have unevenness, and depending on the degree of unevenness, the degree of crushing of the outer bag 21 by the vehicle side wall 50 may vary greatly depending on the position. However, if the position of the gas circulation hole 24 is adjusted to face the flat portion (less uneven portion) of the vehicle side wall 50 when the outer bag 21 is crushed, the gas can be circulated as in this modified example. Even if the hole 24 is provided on the vehicle side wall 50 side of the inner bag 23, the gas flow hole 24 can be reliably closed by the outer bag 21 during the middle period of restraining the occupant.

A plurality of gas flow holes 24 may be provided. As a result, the amount of gas flowing from the inner bag 23 to the outer bag 21 increases at the initial stage of restraint of the occupant, and as a result, the outer bag 21 inflates and deploys more quickly toward the vehicle side wall 50 of the occupant 40. The occupant 40 can be reliably protected.

For example, as a modification 2 of the present embodiment, the gas flow holes 24 may be provided on both the occupant 40 side and the vehicle side wall 50 side of the inner bag 23 . 9A and 9B are schematic diagrams showing an occupant restraining state by the side airbag in the side airbag device of Modification 2 of Embodiment 1. FIG. 6(b) shows a cross section of a portion corresponding to line segment B3-B4 in FIG. 6(a) in the middle stage of occupant restraint. In this modified example as well, the gas flow hole 24 can be blocked by the outer bag 21 during the middle period of restraining the occupant. The opening area of the gas circulation hole 24 provided on the occupant 40 side of the inner bag 23 and the opening area of the gas circulation hole 24 provided on the vehicle side wall 50 side of the inner bag 23 may be the same. can be different.

Although the shape of the gas flow hole 24 is not particularly limited, it is preferably circular as shown in FIG. 6(a).

(Occupant restraint latter half)
10A and 10B are schematic diagrams showing the state of the side airbag device of Embodiment 1 in the latter stage of restraining the occupant by the side airbag, where FIG. state. 10(a) and 10(b) schematically show the state 40 ms after the start of operation of the inflator 10. FIG.

When the amount of displacement of the vehicle side wall 50 due to the side collision further increases and the distance between the occupant 40 and the vehicle side wall 50 becomes narrower than the state shown in FIG. 21 is further crushed between the occupant 40 and the vehicle sidewall 50 . At this time as well, the gas flow hole 24 remains blocked by the crushed outer bag 21, as in the middle period of restraining the occupant. Therefore, since the outflow of gas from the inner bag 23 to the outer bag 21 continues to be blocked, the internal pressure of the inner bag 23 is maintained high. On the other hand, when the outer bag 21 is more crushed than the state shown in FIG. 6B, the gas inside the outer bag 21 is further discharged to the outside through the vent holes 22, so the outer bag 21 maintains its soft state. .

Therefore, even in the latter period of restraining the occupant by the side airbags 20 as described above, an internal pressure difference is generated between the inner bag 23 and the outer bag 21 as in the middle period of restraining the occupant. While the chest 41, which is a relatively fragile portion of the occupant 40, is protected by the outer bag 21 in a soft state, the back 45, which is a relatively strong portion of the torso of the occupant 40, is maintained at a high internal pressure. It is protected by the inner bag 23.

As described above, according to the present embodiment, in the process in which the side airbag 20 restrains the occupant 40 in the event of a side collision of the vehicle, the gas flow holes 24 provided in the inner bag 23 are crushed. Therefore, the internal pressure of the inner bag 23 is kept high for a long period of time. Therefore, even if the side collision speed of the vehicle is high and the collision energy is large, the impact from the side wall 50 of the vehicle can be absorbed by the side airbag 20 (in particular, the inner bag 23). On the other hand, since the inner bag 23 is arranged along the extending direction (height direction) of the seat back 31, that is, along the back 45 of the occupant 40, the side airbag 20 (inner bag 23) The reaction force is received by the back 45 which is a relatively strong part of the torso of the occupant 40 . Therefore, a large impact is not applied to the chest 41, which is a relatively fragile portion of the torso of the occupant 40, and the occupant 40 is appropriately protected.

As for the other components of the side airbag device 1, the same components as those of conventionally known side airbag devices can be appropriately used.

[Embodiment 2]
The side airbag device of Embodiment 2 will be described below with reference to the drawings, focusing on the inflation and deployment behavior of the side airbag. The side airbag device of Embodiment 2 is the same as the side airbag device of Embodiment 1 except for the configuration of the inner bag, and thus overlapping descriptions will be omitted as appropriate.

(Before expansion and deployment)
The state before inflation and deployment of the side airbag 20 is the same as the state already described with reference to FIG.

(Early stage of occupant restraint)
11A and 11B are schematic diagrams showing the initial state of restraining the occupant by the side airbag in the side airbag device of Embodiment 2, where (a) shows the state viewed from the side, and (b) shows the state viewed from above. state. FIG. 12 is a schematic cross-sectional view showing a portion corresponding to the line segment in FIG. - shows a cross-section of the part corresponding to B2.

When the vehicle side-collides with an obstacle 60 (for example, another vehicle) and the inflator 10 is activated, the gas generated by the inflator 10 is introduced into the side airbag 20, and the side airbag 20 is unfolded. It expands while he is. When the skin 32 of the seat back 31 is torn by the force applied from the inflated side airbag 20, the side airbag 20 moves toward the vehicle side wall 50 of the occupant 40 as shown in FIGS. Inflate and deploy (full deployment). Thus, in the early stage of occupant restraint, the entire torso (chest 41, back 45, etc.) of the occupant 40 is protected by the soft outer bag 21, which does not increase the internal pressure too much due to expansion while being unfolded.

As shown in FIGS. 12(a) and 12(b) (FIG. 11(a)), the outer bag 21 is composed of an outer base fabric 25A. The outer base fabric 25A is formed in a bag shape by joining the base fabrics 25a, 25b, and 25c as shown in FIG. The outer base fabric 25A may be formed into a bag shape by folding one base fabric in two and joining the outer periphery of the folded fabric.

As shown in FIGS. 12(a) and 12(b) (FIG. 11(a)), the inner bag 23 separates a portion of the outer base fabric 25A forming the outer bag 21 from the interior of the outer bag 21. It consists of a partition-like base fabric 29 joined to the outer base fabric 25A and a base fabric constituting an area surrounded by. Specifically, the partition wall-shaped base fabric 29 as shown in FIG. It is joined at a joint portion 27b to a portion other than the portion. FIG. 13 is a schematic plan view showing the partition-like base fabric in FIGS. 11 and 12. FIG. Here, the end portion (peripheral portion) of the partition-like base cloth 29 other than the end portion 29a and the part of the end portion of the outer base cloth 25A composed of the base cloths 25a, 25b, and 25c are marked X2 and the mark X2. Y4 overlaps, and the mark X3 and the mark Y5 overlap each other, and are joined at the outer peripheral joint portion 26b (which also serves as a part of the outer peripheral joint portion 26a). As described above, the inner bag 23 made of the base fabric forming the area surrounded by the part of the base fabrics 25a and 25b forming the outer base fabric 25A and the partition-like base fabric 29 is obtained.

As the partition-like base fabric 29, for example, a fabric woven with threads such as nylon 66 and polyethylene terephthalate (PET) is used. The partition-like base fabric 29 may be coated with an inorganic material such as silicon in order to improve heat resistance and airtightness.

(Occupant restraint middle term)
14A and 14B are schematic diagrams showing the state of the side airbag device of Embodiment 2 in the middle stage of restraining the occupant by the side airbag, where (a) shows the state viewed from the side, and (b) shows the state viewed from above. state. FIG. 15 is a schematic cross-sectional view showing a portion corresponding to the line segment in FIG. - shows a cross-section of the part corresponding to B4.

When the amount of displacement of the vehicle side wall 50 due to the side collision increases and the distance between the occupant 40 and the vehicle side wall 50 becomes narrower than in the state shown in FIG. 11(b), as shown in FIG. The outer bag 21 of the side airbag 20 is crushed between the occupant 40 and the side wall 50 of the vehicle. At this time, as shown in FIG. 15(b), the crushed outer bag 21 closes the gas flow hole 24 provided in the inner bag 23. Then, as shown in FIG. As a result, the outflow of gas from the inner bag 23 to the outer bag 21 is blocked, so the internal pressure of the inner bag 23 is maintained high. On the other hand, since the outer bag 21 is provided with the vent hole 22 communicating with the outside, the gas in the outer bag 21 is discharged to the outside through the vent hole 22 when the outer bag 21 is crushed. As a result, the outer bag 21 is in a soft state with an appropriately adjusted internal pressure.

Therefore, in the middle period of restraining the occupant by the side airbag 20 as described above, an internal pressure difference is generated between the inner bag 23 and the outer bag 21, and a relatively fragile portion of the torso of the occupant 40 is affected. A certain chest 41 is protected by the outer bag 21 in a soft state, while the back 45, which is a relatively strong part of the torso of the occupant 40, is protected by the inner bag 23 whose internal pressure is kept high. . At this time, as shown in FIG. 14A, the inner bag 23 is arranged along the extending direction (height direction) of the seat back 31, that is, along the back 45 of the occupant 40. The back 45 can be reliably protected.

As shown in FIG. 15(b), the gas flow hole 24 is preferably provided on the inner bag 23 on the occupant 40 side. The gas flow hole 24 may be provided on the vehicle side wall 50 side of the inner bag 23 , or may be provided on both the occupant 40 side and the vehicle side wall 50 side of the inner bag 23 .

(Occupant restraint latter half)
16A and 16B are schematic diagrams showing the state of the side airbag device of Embodiment 2 in the latter stage of restraining the occupant by the side airbag, where (a) shows the state viewed from the side, and (b) shows the state viewed from above. state.

When the amount of displacement of the vehicle side wall 50 due to the side collision further increases and the distance between the occupant 40 and the vehicle side wall 50 becomes narrower than the state shown in FIG. 21 is further crushed between the occupant 40 and the vehicle sidewall 50 . At this time as well, the gas flow hole 24 remains blocked by the crushed outer bag 21, as in the middle period of restraining the occupant. Therefore, since the outflow of gas from the inner bag 23 to the outer bag 21 continues to be blocked, the internal pressure of the inner bag 23 is maintained high. On the other hand, when the outer bag 21 is more crushed than the state shown in FIG. 14(b), the gas inside the outer bag 21 is further discharged to the outside through the vent holes 22, so the outer bag 21 maintains its soft state. .

Therefore, even in the latter period of restraining the occupant by the side airbags 20 as described above, an internal pressure difference is generated between the inner bag 23 and the outer bag 21 as in the middle period of restraining the occupant. While the chest 41, which is a relatively fragile portion of the occupant 40, is protected by the outer bag 21 in a soft state, the back 45, which is a relatively strong portion of the torso of the occupant 40, is maintained at a high internal pressure. It is protected by the inner bag 23.

As described above, according to the present embodiment as well, in the process in which the side airbag 20 restrains the occupant 40 in the event of a side collision of the vehicle, the gas flow holes 24 provided in the inner bag 23 are displaced by the crushed outer bag 21. Since it is closed, the internal pressure of the inner bag 23 is maintained high for a long period of time. Therefore, even if the side collision speed of the vehicle is high and the collision energy is large, the impact from the side wall 50 of the vehicle can be absorbed by the side airbag 20 (in particular, the inner bag 23). On the other hand, since the inner bag 23 is arranged along the extending direction (height direction) of the seat back 31, that is, along the back 45 of the occupant 40, the side airbag 20 (inner bag 23) The reaction force is received by the back 45 which is a relatively strong part of the torso of the occupant 40 . Therefore, a large impact is not applied to the chest 41, which is a relatively fragile portion of the torso of the occupant 40, and the occupant 40 is appropriately protected.

[Embodiment 3]
A side airbag device of Embodiment 3 will be described below with reference to the drawings. The side airbag device of Embodiment 3 is the same as the side airbag device of Embodiment 1 except for the configuration of the inner bag, and thus overlapping descriptions will be omitted as appropriate.

So far, the case where the internationally standardized side impact dummy sits on the vehicle seat 30 as the occupant 40 has been described. In some cases, the vehicle seat 30 is seated, and in other cases, a WS5-type internationally standardized side collision dummy simulating a small-sized passenger is seated on the vehicle seat 30 . FIG. 17 is a schematic diagram of the side airbag device of Embodiment 3, showing the intermediate state of restraining the occupant by the side airbag when the WS50 internationally standardized side impact dummy is seated on the vehicle seat. FIG. 18 is a schematic diagram of the side airbag device of Embodiment 3, showing a middle state of restraining the occupant by the side airbag when the WS5 internationally standardized side impact dummy is seated on the vehicle seat. 17 and 18 show a side view of the side airbag device of Embodiment 3. FIG.

During the middle period of occupant restraint by the side airbags 20 (the same applies to the latter period of occupant restraint), the crushed outer bag 21 closes the gas flow hole 24 provided in the inner bag 23 as described above. As a result, the outflow of gas from the inner bag 23 to the outer bag 21 is blocked, so the internal pressure of the inner bag 23 is maintained high. Therefore, as shown in FIGS. 17 and 18, in each of the WS50 type internationally unified side collision dummy 40A and the WS5 type internationally unified side collision dummy 40B, the back portion 45, which is a relatively strong portion of the torso portion 47, is , are protected by an inner bag 23 whose internal pressure is kept high. In this case, even if the size of the inner bag 23 is suitable for the back portion 45 of the WS50 type internationally standardized side impact dummy 40A, it may be too large for the back portion 45 of the WS5 type internationally standardized side impact dummy 40B. As a result, in the WS5 internationally standardized side collision dummy 40B, the chest 41, which is a relatively weak portion of the torso 47, may also be protected by the inner bag 23.

On the other hand, in this embodiment, as shown in FIGS. 17 and 18, the inner bag 23 is further provided with a gas adjustment hole 70 communicating with the outer bag 21 in addition to the gas communication hole 24 . The gas flow hole 24 and the gas adjustment hole 70 are provided on the occupant side of the inner bag 23 (in this embodiment, on the side of the WS50 internationally unified side collision dummy 40A or the WS5 internationally unified side collision dummy 40B side). ing.

The gas adjustment hole 70 is positioned above the gas communication hole 24 . It is preferable that the gas flow hole 24 is provided in the lower portion of the inner bag 23 and the gas adjustment hole 70 is provided in the upper portion of the inner bag 23 . Here, the “lower portion of the inner bag 23” refers to a portion below the central portion of the inner bag 23 in the vertical direction. The “upper portion of the inner bag 23” refers to a portion above the central portion of the inner bag 23 in the vertical direction.

More specifically, as shown in FIGS. 17 and 18, the gas flow hole 24 overlaps the waist 46 when the WS50 internationally standardized side impact dummy 40A is seated on the vehicle seat 30, and the WS5 type. It is preferable that the internationally standardized side collision dummy 40B is provided at a position overlapping with the waist 46 when the vehicle seat 30 is seated. As a result, regardless of the occupant's body type, specifically, even a standard occupant such as the WS50 internationally standardized side impact dummy 40A and a small sized occupant such as the WS5 internationally standardized side impact dummy 40B Even so, the gas circulation hole 24 is reliably closed by the crushed outer bag 21 .

As shown in FIGS. 17 and 18, the gas adjustment hole 70 overlaps the shoulder portion 43 of the WS50 type internationally standardized side impact dummy 40A when seated on the vehicle seat 30, and also overlaps with the WS5 type internationally standardized side impact dummy 40A. It is preferable that the collision dummy 40B is provided at a position that does not overlap with the shoulder portion 43 when the vehicle seat 30 is seated.

As a result, when an occupant of a standard physique such as the WS50 internationally standardized side impact dummy 40A (or an occupant of a larger physique) sits on the vehicle seat 30, the gas adjustment hole 70 is opened in the same manner as the gas flow hole 24. It is closed by the crushed outer bag 21, and the internal pressure of the inner bag 23 is kept high. Therefore, the back 45 is protected by the inner bag 23 whose internal pressure is kept high for a standard body type occupant such as the WS50 type internationally standardized side impact dummy 40A (or an occupant of a larger body type).

On the other hand, when a small-sized occupant such as the WS5 type internationally standardized side collision dummy 40B sits on the vehicle seat 30, unlike the gas flow hole 24, the gas adjustment hole 70 is closed by the crushed outer bag 21. do not have. Therefore, the gas in the inner bag 23 flows out into the outer bag 21 through the gas adjustment hole 70, and as a result, the inner bag 23 is in a soft state with an appropriately adjusted internal pressure. Therefore, even if the inner bag 23 overlaps the chest 41, the chest 41 is protected by the soft inner bag 23 for a small occupant such as the WS5-type international side collision dummy 40B.

As described above, according to the present embodiment, the internal pressure of the side airbag 20, particularly the inner bag 23, can be appropriately adjusted by the gas adjustment hole 70 according to the body shape of the seated occupant. adequately protected.

A preferred location for the gas adjustment hole 70 is specifically shown in FIG. FIG. 19 is a schematic diagram for explaining preferred positions of gas adjustment holes and gas circulation holes in the side airbag device of Embodiment 3. FIG. FIG. 19 shows a side view of the side airbag device of the third embodiment. As shown in FIG. 19, first, when the WS50 internationally standardized side impact dummy 40A is seated on the vehicle seat 30, the rotation center of the thigh 48 is set to a first point P1 (also called a "hip point"). ), and the center of the connection point between the shoulder portion 43 and the trunk portion 47 is defined as a second point P2. Next, the first point P1 is the origin, the direction from the first point P1 to the second point P2 is the positive direction, and the first straight line (also called "torso line") is the Y axis. , and the second straight line with the forward direction of the WS50 type internationally unified side impact dummy 40A as the positive direction is defined as the X axis. In such two-dimensional coordinates, the gas adjustment hole 70 has a rectangular inner region with four points (90, 469), (56, 399), (-107, 452), and (-60, 546) as vertices. It is preferable to overlap with

A preferred location for the gas flow holes 24 is also specifically shown in FIG. As shown in FIG. 19, first, when the WS50 type internationally standardized side impact dummy 40A is seated on the vehicle seat 30, the rotation center of the thigh 48 is set to the first point P1, the shoulder 43 and the torso. The center of the connection point of 47 is defined as a second point P2. Next, the first point P1 is the origin, the direction from the first point P1 to the second point P2 is the positive direction, and the first straight line is the Y axis. A two-dimensional coordinate (X, Y) (unit: mm) is defined with a second straight line whose positive direction is the forward direction of the unified side impact dummy 40A as the X axis. In such two-dimensional coordinates, the gas flow hole 24 is a square with four points (66, 63), (45, -73), (-159, -2), and (-139, 167) as vertices. It preferably overlaps with the inner region.

As shown in FIGS. 17 and 18, it is preferable that the opening area of the gas adjustment hole 70 is equal to or less than the opening area of the gas communication hole 24 . As a result, the internal pressure of the inner bag 23 can be easily adjusted by the gas adjustment hole 70 appropriately according to the body shape of the seated occupant.

Although the shape of the gas adjustment hole 70 is not particularly limited, it is preferably circular as shown in FIGS.

As shown in FIGS. 17 and 18, in the inner bag 23, the base fabric 25d may be joined at the joining portion 27c. As a result, a portion of the inner bag 23 is provided with a non-inflatable portion. Therefore, as shown in FIG. 20, the inner bag 23 protects the thighs 48 of the occupant (in this embodiment, the WS50 internationally standardized side impact dummy 40A or the WS5 internationally standardized side impact dummy 40B). Even if the shape of the inner bag 23 expands from the upper portion toward the lower portion, the provision of the non-inflatable portion in the central portion of the inner bag 23 prevents it from overlapping near the chest 41 of the occupant. , the occupant's chest 41 can be easily protected only by the outer bag 21 in a soft state. FIG. 20 is a schematic cross-sectional view showing a portion corresponding to line segment A3-A4 in FIGS.

The present invention is not limited to the contents described in the above embodiments. Each configuration described in the embodiments may be appropriately deleted, added, changed, or combined without departing from the gist of the present invention.

1: Side airbag device 10: Inflator 11: Bolt 20: Side airbag 21: Outer bag 22: Vent hole 23: Inner bag 24: Gas distribution hole 25A: Outer base cloth 25B: Inner base cloth 25a, 25b, 25c, 25d: base fabrics 26a, 26b: outer joints 27a, 27b, 27c: joints 28: front portion of inner bag 29: partition-like base fabric 29a: edge of partition-like base fabric 30: vehicle seat 31: seat back (backrest)
32: skin 33: side frame 34: cushion pad 40: occupant (international standard side collision dummy)
40A: WS50 type internationally unified side collision dummy 40B: WS5 type internationally unified side collision dummy 41: Chest 42: Upper arm 43: Shoulder 44: Abdomen 45: Back 46: Waist 47: Torso 48: Thigh 50 : Vehicle side wall 60: Obstacle 70: Gas adjustment hole P1: First point (rotation center of thigh)
P2: Second point (center of joint of shoulder and torso)
X1, X2, X3, X4, X5, X6, X7, Y1, Y2, Y3, Y4, Y5: Markers

Claims (13)

an inflator that generates gas;
The side is folded and stored in the side portion of the seat back of the vehicle seat, and is inflated and deployed toward the vehicle side wall side of the occupant seated on the vehicle seat by the gas when the inflator is actuated to protect the side portion of the occupant. an airbag;
The side airbag includes an outer bag and an inner bag that encloses the inflator and is arranged in the rear portion of the outer bag along the extending direction of the seat back,
The outer bag is provided with a vent hole communicating with the outside,
The inner bag is provided with a gas flow hole communicating with the outer bag,
The gas flow hole is provided at a position where it is closed by the outer bag when the side airbag in an inflated and deployed state is crushed between the occupant and the side wall of the vehicle ,
The inner bag is further provided with a gas adjustment hole that can be closed by the outer bag when the inflated and deployed side airbag is crushed between the occupant and the side wall of the vehicle. A side airbag device characterized by : The side airbag device according to claim 1,
A side airbag device according to claim 1, wherein the gas flow hole is provided in a central portion or rearward of the central portion in the front-rear direction of the inner bag. The side airbag device according to claim 1 or 2,
A side airbag device, wherein the gas flow hole is provided on the passenger side of the inner bag. The side airbag device according to any one of claims 1 to 3,
A side airbag device, wherein the gas flow hole is provided in a lower portion of the inner bag. The side airbag device according to any one of claims 1 to 4,
The inner bag is arranged in the outer bag, and is composed of a bag-shaped inner base fabric whose end is joined together with a part of the end of the outer base fabric that constitutes the outer bag. side airbag device. The side airbag device according to any one of claims 1 to 4,
The inner bag is a base that constitutes an area surrounded by a portion of the outer base fabric that constitutes the outer bag and a partition wall-shaped base fabric that is joined to the outer base fabric so as to partition the interior of the outer bag. A side airbag device characterized by being made of cloth. The side airbag device according to any one of claims 1 to 6,
the gas adjustment hole communicates with the outer bag,
The gas flow hole and the gas adjustment hole are provided on the occupant side of the inner bag,
The side airbag device, wherein the gas adjustment hole is located above the gas circulation hole. The side airbag device according to claim 7,
The gas flow hole is provided in a lower portion of the inner bag,
A side airbag device, wherein the gas adjustment hole is provided in an upper portion of the inner bag. The side airbag device according to claim 7 or 8,
The side airbag device, wherein the opening area of the gas adjustment hole is equal to or less than the opening area of the gas circulation hole. an inflator that generates gas;
The side is folded and stored in the side portion of the seat back of the vehicle seat, and is inflated and deployed toward the vehicle side wall side of the occupant seated on the vehicle seat by the gas when the inflator is actuated to protect the side portion of the occupant. an airbag;
The side airbag includes an outer bag and an inner bag that encloses the inflator and is arranged in the rear portion of the outer bag along the extending direction of the seat back,
The outer bag is provided with a vent hole communicating with the outside,
The inner bag is provided with a gas flow hole communicating with the outer bag,
The gas flow hole is provided at a position where it is closed by the outer bag when the side airbag in an inflated and deployed state is crushed between the occupant and the side wall of the vehicle,
When the side airbag device is viewed from the side, the gas flow hole overlaps the waist of the WS50 internationally standardized side impact dummy seated on the vehicle seat, and the WS5 internationally standardized lateral A side airbag device, wherein the collision dummy is provided at a position overlapping with the waist of the vehicle seat when the collision dummy is seated on the vehicle seat. an inflator that generates gas;
The side is folded and stored in the side portion of the seat back of the vehicle seat, and is inflated and deployed toward the vehicle side wall side of the occupant seated on the vehicle seat by the gas when the inflator is actuated to protect the side portion of the occupant. an airbag;
The side airbag includes an outer bag and an inner bag that encloses the inflator and is arranged in the rear portion of the outer bag along the extending direction of the seat back,
The outer bag is provided with a vent hole communicating with the outside,
The inner bag is provided with a gas flow hole and a gas adjustment hole communicating with the outer bag,
The gas flow hole is provided at a position where it is closed by the outer bag when the side airbag in an inflated and deployed state is crushed between the occupant and the side wall of the vehicle,
The gas flow hole and the gas adjustment hole are provided on the occupant side of the inner bag,
The gas adjustment hole is positioned above the gas flow hole,
When the side airbag device is viewed from the side, the gas adjustment hole overlaps the shoulder of the WS50 internationally standardized side impact dummy seated on the vehicle seat, and the WS5 internationally standardized A side airbag device, wherein the side impact dummy is provided at a position that does not overlap with a shoulder portion of the vehicle seat when the dummy is seated. an inflator that generates gas;
The side is folded and stored in the side portion of the seat back of the vehicle seat, and is inflated and deployed toward the vehicle side wall side of the occupant seated on the vehicle seat by the gas when the inflator is actuated to protect the side portion of the occupant. an airbag;
The side airbag includes an outer bag and an inner bag that encloses the inflator and is arranged in the rear portion of the outer bag along the extending direction of the seat back,
The outer bag is provided with a vent hole communicating with the outside,
The inner bag is provided with a gas flow hole and a gas adjustment hole communicating with the outer bag,
The gas flow hole is provided at a position where it is closed by the outer bag when the side airbag in an inflated and deployed state is crushed between the occupant and the side wall of the vehicle,
The gas flow hole and the gas adjustment hole are provided on the occupant side of the inner bag,
The gas adjustment hole is positioned above the gas flow hole,
When the WS50 type internationally standardized side impact dummy is seated on the vehicle seat, the rotation center of the thigh is assumed to be the first point, and the center of the connection point between the shoulder and torso is assumed to be the second point. When the side airbag device is viewed from the side, the first straight line with the first point as the origin and the direction from the first point to the second point as the positive direction is the Y-axis. , two-dimensional coordinates (X, Y) (unit: mm), the gas regulation hole overlaps with the interior area of a square with four points (90,469), (56,399), (−107,452), (−60,546) as vertices. A side airbag device characterized by: an inflator that generates gas;
The side is folded and stored in the side portion of the seat back of the vehicle seat, and is inflated and deployed toward the vehicle side wall side of the occupant seated on the vehicle seat by the gas when the inflator is actuated to protect the side portion of the occupant. an airbag;
The side airbag includes an outer bag and an inner bag that encloses the inflator and is arranged in the rear portion of the outer bag along the extending direction of the seat back,
The outer bag is provided with a vent hole communicating with the outside,
The inner bag is provided with a gas flow hole communicating with the outer bag,
The gas flow hole is provided at a position where it is closed by the outer bag when the side airbag in an inflated and deployed state is crushed between the occupant and the side wall of the vehicle,
When the WS50 type internationally standardized side impact dummy is seated on the vehicle seat, the rotation center of the thigh is assumed to be the first point, and the center of the connection point between the shoulder and torso is assumed to be the second point. When the side airbag device is viewed from the side, the first straight line with the first point as the origin and the direction from the first point to the second point as the positive direction is the Y-axis. , two-dimensional coordinates (X, Y) (unit: mm), the gas flow hole is a quadrangular inner region with four points (66, 63), (45, -73), (-159, -2), (-139, 167) as vertices. A side airbag device characterized by overlapping with.

Images