JP2022080415A - Airbag and airbag device - Google Patents

Abstract

To provide an airbag which enables an occupant to be escaped or rescued easily after restraint of the occupant is completed.SOLUTION: An airbag 20 includes: a rear expansion part 21 which deploys to the back surface side of a seat 60; a pair of side expansion parts 22A, 22B which extend forward from both sides of the rear expansion part 21 in a seat width direction and are connected with each other at the front side of the seat 60; and sub bags 23A, 23B which are provided from the side expansion parts 22A, 22B to the center side of the seat 60 and the front side of the seat 60. Exhaust vents 27 are provided on facing surfaces between the sub bags 23A, 23B and the side expansion parts 22A, 22B.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to airbags and airbag devices.

Conventionally, a method has been proposed in which an airbag is deployed from the headrest or seat back of a vehicle seat, and the airbag protects all directions of the head of an occupant seated in the seat (for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2017-03373

Conventional airbags that protect the occupant's head in all directions maintain bag pressure for a long time compared to front airbags and side airbags because the airbag is deployed toward the front of the vehicle from the headrest and seat back. It is a structure to do. It is desirable that the clearance (gap) between the airbag and the occupant is small at the time of occupant restraint, but it is preferable that this clearance can be increased in order to facilitate the escape and rescue of the occupant after the occupant restraint is completed.

It is an object of the present disclosure to provide an airbag and an airbag device capable of facilitating the escape and rescue of an occupant after the completion of occupant restraint.

The airbag according to one aspect of the embodiment of the present invention extends forward from both sides in the seat width direction of the rear expansion portion developed on the rear side of the seat and the rear expansion portion, and is connected to each other in front of the seat. A pair of lateral expansion portions and a sub-bag provided from the lateral expansion portion to the center of the seat and in front of the seat are provided, and an exhaust port is provided on a facing surface between the sub-bag and the lateral expansion portion. Is provided.

Similarly, the airbag device according to one aspect of the embodiment of the present invention includes an inflator and the above-mentioned airbag developed by a gas supplied from the inflator.

According to the present disclosure, it is possible to provide an airbag and an airbag device that can easily escape or rescue an occupant after the occupant restraint is completed.

Perspective view of the airbag device according to the embodiment when the airbag is deployed. Side view of the airbag device shown in FIG. Front view of the airbag device shown in FIG. Schematic diagram showing a schematic configuration of the airbag in FIGS. 1 to 3 in a plan view. AA cross-sectional view in FIG. Schematic diagram showing the behavior of the sub-bag after occupant restraint

Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as possible in the drawings, and duplicate description is omitted.

In the following description, the x-direction, y-direction, and z-direction shown in the drawings are perpendicular to each other. The x direction is the front-rear direction of the vehicle, the x-positive direction side is the front of the vehicle, and the x-negative direction side is the rear of the vehicle. The y direction is the width direction of the vehicle, the positive direction side of the vehicle is the right side of the vehicle, and the negative direction side of the vehicle is the left side of the vehicle. The z direction is the vertical direction, the z positive direction side is upward, and the z negative direction side is downward.

First, the configuration of the airbag device 10 according to the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of the airbag device 10 according to the embodiment when the airbag is deployed. FIG. 2 is a side view of the airbag device 10 shown in FIG. FIG. 3 is a front view of the airbag device 10 shown in FIG. FIG. 4 is a schematic view showing a schematic configuration of the airbag 20 in FIGS. 1 to 3 in a plan view. FIG. 5 is a cross-sectional view taken along the line AA in FIG.

As shown in FIGS. 1 to 5, the airbag device 10 is mounted on the seat 60 of the vehicle. The seat 60 includes a seat portion 61 on which the occupant D sits, a seat back 62 having a lower end connected to the rear end of the seat portion 61, and a headrest 63 provided at the upper end of the seat back 62. A frame 64 is arranged inside the seat back 62. Although not shown in FIGS. 1 to 3, the seat 60 is also equipped with general elements such as a seat belt, a tongue, a buckle, and a retractor, which are mounted on a vehicle seat.

Further, in the present embodiment, the front seat on the right side of the vehicle is exemplified as the seat 60 on which the airbag device 10 is mounted. In this case, the y positive direction side is the outside of the vehicle, and the y negative direction side is the inside of the vehicle.

The airbag device 10 protects the occupant D from collisions in all directions in the front, rear, left, and right directions by the deployed airbag 20 with the occupant D seated in the seat 60. The airbag 20 covers the periphery of the headrest 63 of the seat 60 and the head H of the occupant D seated in the seat 60, and is formed in a cylindrical shape with upper and lower openings.

1 to 5 show a state in which a crash test dummy is seated on the seat portion 61 of the seat 60 as a model of the occupant D to be protected. The dummy doll is, for example, AM50 (50th percentile of an American adult male) of WorldSID (World Side Impact Dummy). This dummy doll is seated in a standard sitting posture (normal state) defined by the collision test method, and the seat 60 is located at a reference setting position corresponding to the sitting posture. The head H of the dummy doll has its face facing the front of the vehicle (the front side of the seat 60).

The airbag device 10 includes an airbag 20, an inflator 30, and an accommodating portion 40.

The airbag 20 is configured as a cylindrical integrated bag body that is expanded and deployed so as to cover the head H of the occupant D from the front and both left and right sides. More specifically, the airbag 20 has a rear expansion portion 21, a pair of side expansion portions 22A and 22B, and a pair of sub-bags 23A and 23B.

The rear expansion portion 21 is deployed at a position behind the headrest 63 so as to face the headrest 63 and the seat back 62. As shown in FIG. 4, the rear expansion portion 21 is connected to the rear side ends of the pair of lateral expansion portions 22A and 22B via the rear bending portions 74A and 74B at the ends on both sides in the y direction. .. The rear bending portions 74A and 74B are bent substantially at right angles to the x positive direction side, and as shown in FIGS. 1, 2 and 4, the pair of lateral expanding portions 22A and 22B extend forward from the rear expanding portion 21. ..

The pair of lateral expansion portions 22A and 22B are arranged on the left and right sides of the head H of the occupant D, respectively. The pair of lateral expansion portions 22A and 22B are formed to have a longer vertical dimension on the front side with respect to the rear side and a longer dimension on the lower side. The length on the front side is substantially the same as the vertical dimension from above the head H of the occupant D to the position in front of the chest.

Further, as shown in FIGS. 1 to 3, the crown portions 29A and 29B protruding upward from the other portions are provided on the upper portions of the pair of lateral expansion portions 22A and 22B, respectively. The crown portions 29A and 29B are formed at a height that allows contact with the ceiling of the passenger compartment.

As shown in FIGS. 3 and 4, the pair of lateral expansion portions 22A and 22B are joined to each other along the z direction by the central joint portion 76 at a substantially central position in the y direction. As a result, the occupant D is arranged side by side in front of the head H, and the front of the head H can be completely closed.

In this way, the airbag 20 is a donut that surrounds all directions of the head H of the occupant D in the front-rear direction and the left-right direction by joining both ends of the integral bag body by joint stitching by the central joint portion 76. It is formed in a shape.

Further, in the pair of lateral expansion portions 22A and 22B, by arranging the central joint portion 76 in the center in the width direction, as shown in FIG. 4, the lateral expansion portions 22A and 22B of the side expansion portions 22A and 22B are viewed from the occupant D side. A front recess 26 recessed forward is formed in a substantially central portion in the y direction. The front recess 26 extends in the z direction over the range of the central joint 76. Since the front recess 26 is provided on the inner surface of the lateral expansion portions 22A and 22B, the contact surface of the inner surface of the lateral expansion portions 22A and 22B with respect to the head H is widened, and the facing angles are also diversified. The direction in which the airbag 20 can absorb the impact can be increased on the front side of the vehicle, and the occupant D can be protected from a collision in a wider direction.

The upper end positions of the pair of lateral expansion portions 22A and 22B may be above the crown portion of the head H of the occupant D. Further, the lower end position is provided so as to cover the chest of the occupant D in the present embodiment, but may be at least a position capable of covering the head H of the occupant D, as shown in FIGS. 1 to 5. It may be shorter than the dimensions of the present embodiment shown.

The pair of sub-bags 23A and 23B are provided on the center side of the seat 60 and the front side of the seat 60 from the lateral expansion portions 22A and 22B, respectively. As shown in FIG. 5, the pair of sub-bags 23A and 23B communicate with the lower portions of the lateral expansion portions 22A and 22B when expansion is completed, respectively. The sub-bags 23A and 23B extend from the lower ends of the lateral expansion portions 22A and 22B to a height at least in front of the chest of the occupant D. As a result, the pair of sub-bags 23A and 23B are arranged side by side in the y direction behind the lateral expansion portions 22A and 22B, and are arranged in parallel with the front portion of the lateral expansion portions 22A and 22B. The front portions of the direction expansion portions 22A and 22B and the sub-bags 23A and 23B are doubly arranged in front of the chest of the occupant D.

The sub-bags 23A and 23B may be communicated with at least the lateral expansion portions 22A and 22B, and the communication position may be other than the lower part of the lateral expansion portions 22A and 22B. Further, the upper end positions of the sub-bags 23A and 23B at the time of expansion may be above the height to the front of the chest of the occupant D (for example, a position above the head H of the occupant D). However, if the upper end positions of the sub-bags 23A and 23B are fastened to the front of the chest and the vertical dimensions of the sub-bags 23A and 23B are shortened as in the present embodiment, the deployment time of the sub-bags 23A and 23B is shortened. It is advantageous to be able to do it.

As shown in FIG. 5, in the airbag 20, the inflator 30 is attached to the inflator insertion port 25 of the rear expansion portion 21, and gas from the inflator 30 is supplied. In the airbag 20, a gas flow path is formed in the order of the rear expansion portion 21 to one side expansion portion 22A and one subbag 23A, and the rear expansion portion 21 to the other side expansion portion 22B and the other. Gas flow paths are formed in the order of the subbag 23B.

The sub-bags 23A and 23B expand so as to reduce the distance between the pair of lateral expansion portions 22A and 22B and the occupant D seated in the seat 60 after the rear expansion portions 21 and the lateral expansion portions 22A and 22B are deployed. do. More specifically, as shown in FIG. 5, it has a communication hole 24 that communicates between the subbags 23A and 23B and the lateral expansion portions 22A and 22B, and the lateral expansion portion is adjusted by adjusting the area of the communication hole 24. The sub-bags 23A and 23B are controlled to inflate after the 22A and 22B are deployed.

The term "after the rear expansion portion 21 and the lateral expansion portions 22A and 22B have been expanded" is not limited to the time when the rear expansion portion 21 and the side expansion portions 22A and 22B are completely expanded and the expansion is completed, for example, gas supply. However, when the lateral expansion portions 22A and 22B descend in front of the occupant D, or even if the airbag 20 has not completely descended in front of the occupant D, the restraining surface of the airbag 20 is the occupant D. It also includes timing prior to full expansion, such as when confirmation of prior placement is obtained (eg, when the tips of the lateral expansions 22A, 22B move forward from the head H of occupant D).

By providing such sub-bags 23A and 23B in the airbag device 10 of the present embodiment, the sub-bags 23A and 23B do not yet expand during the deployment of the rear expansion portion 21 and the side expansion portions 22A and 22B. , The clearance between the airbag 20 and the occupant D can be increased. As a result, during the deployment of the airbag 20, the airbag 20 is less likely to interfere with the occupant D, and the airbag 20 can be easily interposed in front of the occupant D. Therefore, the airbag 20 is smoothly placed in front of the occupant D. Can be expanded to. Further, since the sub-bags 23A and 23B expand on the front side of the occupant D after the rear expansion portions 21 and the lateral expansion portions 22A and 22B are deployed, the clearance between the airbag 20 and the occupant D is increased after the airbag 20 is deployed. Can be made smaller. As a result, the airbag 20 can restrain the occupant D at an earlier timing, and the restraint property can be improved. Therefore, the airbag device 10 of the present embodiment can smoothly deploy the airbag 20 toward the front side of the occupant D, and can improve the restraint of the airbag 20 after deployment.

Next, the configurations of the sub-bags 23A and 23B in the airbag 20 according to the present embodiment will be further described with reference to FIG. 6 in addition to FIG. FIG. 5 also shows the behavior of the sub-bags 23A and 23B when the occupant is restrained. FIG. 6 is a schematic view showing the behavior of the sub-bags 23A and 23B after the occupant is restrained.

As shown in FIGS. 5 and 6, an exhaust vent 27 (exhaust port) is provided on the facing surface between the subbags 23A and 23B and the lateral expansion portions 22A and 22B. The exhaust vent 27 is an opening for discharging the gas in the airbag 20 to the outside.

In the present embodiment, the sub-bags 23A and 23B are communicated with the lower part of the lateral expansion portions 22A and 22B when the expansion is completed by the communication hole 24. On the other hand, the portion of the sub-bags 23A and 23B above the communication hole 24 is not fixed to the lateral expansion portions 22A and 22B. That is, since only the lower end portions of the sub-bags 23A and 23B are fixed to the lateral expansion portions 22A and 22B, as shown in FIG. 6, in a state where no external force is applied, the side expansion portions 22A and 22B. On the other hand, it is possible to tilt the seat 60 side with the lower end as the center of rotation.

The exhaust vent 27 is provided above the communication position (the vertical height position of the communication hole 24) between the sub-bags 23A and 23B and the lateral expansion portions 22A and 22B. The exhaust vent 27 is provided on the surfaces of the sub-bags 23A and 23B among the above-mentioned facing surfaces.

As shown in FIG. 5, when the expansion of the airbag 20 is completed and the occupant D is restrained, the occupant D moves forward as shown by the arrow A, thereby contacting the sub-bags 23A and 23B. The airbag 20 restrains the occupant D. At this time, since the sub-bags 23A and 23B are pressed forward by the occupant D, the facing surfaces of the sub-bags 23A and 23B and the lateral expansion portions 22A and 22B are in close contact with each other. Therefore, the exhaust vent 27 provided on the facing surface is in a state of being sealed by the lateral expansion portions 22A and 22B.

After that, when the restraint of the occupant D by the airbag 20 is completed, the occupant D moves away from the airbag 20 and moves backward as shown by the arrow B in FIG. At this time, since the sub-bags 23A and 23B do not receive the pressing force from the occupant D, they tilt backward due to the reaction as shown by the arrow C. As a result, the contact between the front surfaces of the sub-bags 23A and 23B and the inner peripheral surfaces of the lateral expansion portions 22A and 22B is weakened. As a result, the exhaust vent 27 is opened, and gas is discharged from the sub-bags 23A and 23B as shown by the arrow D.

When the gas discharge starts, the airbag 20 starts to shrink in order from the sub-bags 23A and 23B. As a result, the clearance (gap) between the airbag 20 and the occupant D is widened, and it becomes easy to escape or rescue the occupant D after the occupant restraint is completed.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, a shape, and the like are not limited to those exemplified, and can be appropriately changed. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

The exhaust vent 27 may be provided on the facing surface between the subbags 23A and 23B and the side expansion portions 22A and 22B, and may be provided on the surface of the side expansion portions 22A and 22B.

The installation position of the exhaust vent 27 is not limited to the upper part in the vertical direction, and is arbitrary as long as it is sealed during restraint and can be opened when the sub-bags 23A and 23B are separated from the lateral expansion portions 22A and 22B after the restraint is completed. The position is fine.

10 Airbag device 20 Airbag 21 Rear expansion part 22A, 22B Side expansion part 23A, 23B Subbag 24 Communication hole 27 Exhaust vent (exhaust port)
30 Inflator 60 Seat D Crew

Claims (4)

The rear expansion part that expands to the back side of the seat,
A pair of lateral expansion portions extending forward from both sides in the seat width direction of the rear expansion portion and interconnected in front of the seat.
A sub-bag provided on the center side of the seat and in front of the seat from the lateral expansion portion,
Equipped with
An exhaust port is provided on the facing surface between the sub-bag and the lateral expansion portion.
Airbag. The sub-bag is communicated with the lower part of the lateral expansion portion when the expansion is completed.
The exhaust port is provided above the communication position between the sub-bag and the lateral expansion portion.
The airbag according to claim 1. The exhaust port is provided in the sub-bag.
The airbag according to claim 1 or 2. Inflator and
The airbag according to any one of claims 1 to 3, which is developed by the gas supplied from the inflator, and the airbag.
An airbag device equipped with.

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