JP2022080416A - Airbag and airbag device - Google Patents

Abstract

To provide an airbag which can deploy smoothly to the front side of an occupant and enables improvement of restraint performance after deployment.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 expand to reduce a distance between the pair of side expansion parts 22A, 22B and an occupant D seated on the seat 60 after deployment of the rear expansion part 21 and the side expansion parts 22A, 22B.SELECTED DRAWING: Figure 1

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

In the conventional airbag that protects the occupant's head in all directions, the airbag is deployed from the headrest and seat back to the front side of the vehicle. It is desirable that the clearance (gap) with the occupant is large. On the other hand, regarding the restraint of the occupants, it is desirable that the clearance between the airbag and the occupants after deployment is small. Therefore, the interposition and restraint of the airbag are contradictory, and it is desired to make them compatible with each other.

It is an object of the present disclosure to provide an airbag and an airbag device that can be smoothly deployed to the front side of an occupant and can also improve the restraint after deployment.

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 that expands to reduce the distance between the pair of lateral expansion portions and the occupant seated in the seat after the rear expansion portions and the lateral expansion portions are deployed. , Equipped with.

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 be smoothly deployed to the front side of an occupant and can also improve the restraint after deployment.

Perspective view of the airbag device according to the first 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. Top view of the outer panel that makes up the airbag The figure which shows the 1st stage of the bag deployment procedure by the airbag device which concerns on 1st Embodiment The figure which shows the 2nd stage of the airbag deployment procedure by the airbag device which concerns on 1st Embodiment The figure which shows the 3rd stage of the airbag deployment procedure by the airbag device which concerns on 1st Embodiment The figure which shows the 4th stage of the airbag deployment procedure by the airbag apparatus which concerns on 1st Embodiment. The figure which shows the 5th stage of the airbag deployment procedure by the airbag apparatus which concerns on 1st Embodiment. The figure which shows the 6th stage of the airbag deployment procedure by the airbag apparatus which concerns on 1st Embodiment. The figure which shows the 7th stage of the airbag deployment procedure by the airbag apparatus which concerns on 1st Embodiment. First modification of the sub-bag deployment timing control method Second modification of the sub-bag deployment timing control method Third modification of the sub-bag deployment timing control method Perspective view of the airbag device according to the second 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 the schematic configuration of the airbag in FIGS. 17 to 19 in a plan view. BB sectional view in FIG. 20 The figure which shows the 5th stage of the airbag deployment procedure by the airbag apparatus which concerns on 2nd Embodiment The figure which shows the 6th stage of the airbag deployment procedure by the airbag apparatus which concerns on 2nd Embodiment The figure which shows the 7th stage of the airbag deployment procedure by the airbag apparatus which concerns on 2nd Embodiment First modification of the sub-bag deployment timing control method Second modification of the sub-bag deployment timing control method Third modification of the sub-bag deployment timing control method

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 Embodiment]
The first embodiment will be described with reference to FIGS. 1 to 17.

The configuration of the airbag device 10 according to the first 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 first 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 first embodiment, the sub-bags 23A and 23B do not yet expand during the deployment of the rear expansion portion 21 and the lateral expansion portions 22A and 22B. Therefore, 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 on the front side 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 first 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.

FIG. 6 is a plan view of the outer panel 51 constituting the airbag 20. The inner panel 52 is also symmetrically configured with the outer panel 51 in the left-right direction of the drawing.

The outer panel 51 and the inner panel 52 are overlapped and sewn along the outer peripheral sewing line 56 of the peripheral portion to form an integral bag body. In the panel view shown in FIG. 6, the outer panel 51 and the inner panel 52 have a rear expansion portion 21 arranged in the center, and laterally expand on both sides of the rear expansion portion 21 in the width direction (horizontal direction in FIG. 6). The portions 22A and 22B are arranged so as to be slightly inclined downward. Then, the sub-bags 23A and 23B are arranged from the positions of the outer end portions in the width direction of the lateral expansion portions 22A and 22B and the lower ends toward the center side. As shown in FIG. 4, the outer panel 51 forms an outer surface facing outward when the airbag 20 is deployed, and the inner panel 52 forms an inner surface facing the central head H side when the airbag 20 is deployed.

Between the rear expansion portion 21 and the side expansion portions 22A and 22B, circularly sewn portions 55A and 55B sewn in an oval shape are provided at substantially the center in the vertical direction, and the outer panel 51 and the inner panel are provided. It is joined to 52. Since the bending of the bag body is promoted by these circularly sewn portions 55A and 55B, the rear bending portions 74A and 74B are formed. Further, the capacity of the airbag 20 can be reduced by partially joining the outer panel 51 and the inner panel 52 with the circularly sewn portions 55A and 55B.

A pair of circular stitch patches 55C and 55D are provided along the front-rear direction at the substantially central portion of the lateral expansion portions 22A and 22B in the height direction. In the circular stitch patches 55C and 55D, circular patches are arranged on the outside of the outer panel 51 and the inner panel 52, and these patches are sewn between the outer panel 51 and the inner panel 52 to sew between the outer panel 51 and the inner panel 52. It is joined to the panel 52. The circular stitch patches 55C and 55D can reinforce the sewn portion by arranging the patch on the outside.

In the lateral expansion portions 22A and 22B, a pair of circular stitch patches 55C and 55D provided along the front-rear direction are sewn in a straight line along the front-rear direction, whereby the lateral expansion portions 22A and 22B are sewn. The gas flow path of the airbag 20 is divided into two in the height direction, and the thickness of the airbag 20 when expanded is regulated. Further, in the lateral expansion portions 22A and 22B, the circular stitch patches 55C and 55D are also provided on the lower side of the pair of circular stitch patches 55C and 55D described above on the rear side in the front-rear direction. That is, a region in which the two circular stitch patches 55C and 55D are provided is formed in the height direction. In this region, the thickness of the airbag 20 when expanded is further suppressed as compared with other regions.

Sewing lines 76A and 76B are provided along the vertical direction at the outer end portions of the lateral expansion portions 22A and 22B in the width direction, and these sewing lines 76A and 76B are joined to each other to form a central joint portion 76. To.

The procedure for deploying the airbag 20 by the airbag device 10 of the first embodiment will be described with reference to FIGS. 7 to 13. 7 to 13 are diagrams showing the first to seventh stages of the procedure for deploying the airbag 20 by the airbag device 10 according to the first embodiment, respectively.

First, in the first stage shown in FIG. 7, that is, in normal times (when the airbag device 10 is not operated), the airbag 20 is folded and stored in the accommodating portion 40 in the seat back. Then, when an impact equal to or higher than a predetermined threshold value is received due to a vehicle collision or the like, the inflator 30 is operated by the ECU, and gas is started to be supplied from the inflator 30 to the airbag 20.

In the second stage shown in FIG. 8, when the gas starts to be supplied from the inflator 30, the gas is first supplied to the upper bellows folding portion 72 and starts to expand. The bellows folding portion 72 breaks the surface of the seat back 62 while expanding the bellows shape, advances to the rear side of the seat, and begins to expand to the upper side and the rear side of the seat.

In the third stage shown in FIG. 9, the posterior expansion portion 21 is formed when the deployment of the bellows folding portion 72 is completed. After that, when gas starts to be supplied to the roll folding portion 71, the roll folding portion 71 begins to expand in order to expand from the rolled state. At this time, due to the expansion force generated by the expansion, the roll folding portion 71 receives a reaction force from the rear expansion portion 21 developed on the back surface side of the seat to the front side and the upper side of the vehicle. Due to this reaction force, the roll folding portion 71 expands diagonally upward so as to get over the headrest 63. That is, the rear expansion portion 21 that expands first functions as a base for promoting the expansion direction of the roll folding portion 71 forward. Further, since the roll folding portion 71 is wound upward, it rotates downward and unfolds. As the roll folding portion 71 further expands, the lateral expanding portions 22A and 22B begin to expand. The lateral expansion portions 22A and 22B expand upward, and the remaining portion of the roll folding portion 71 expands forward along the ceiling of the vehicle.

In the fourth stage shown in FIG. 10, rear portions of the lateral expansion portions 22A and 22B are formed from the roll folding portion 71 to cover the side of the head H of the occupant D. At this time, the remaining portion of the roll folding portion 71 advances forward from the head H, and the crown portions 29A and 29B of the lateral expansion portions 22A and 22B hit the ceiling and face upward due to the reaction force from the ceiling. The deployment direction is switched downward, and it begins to deploy downward from the vehicle ceiling.

In the fifth stage shown in FIG. 11, the front portions of the lateral expansion portions 22A and 22B are formed from the roll folding portion 71, and also cover the front portion of the head H of the occupant D. At this time, since the sub-bags 23A and 23B arranged at the tips of the front portions of the lateral expansion portions 22A and 22B have not yet expanded, the lateral expansion portions 22A and 22B are shown by arrows A in FIG. The clearance (gap) between the front portion and the head H of the occupant D is large. As a result, the airbag 20 can be easily deployed to the front side of the head H of the occupant D, and can easily cover the head D.

In the sixth stage shown in FIG. 12, the front portions of the lateral expansion portions 22A and 22B expand further downward, and when the deployment of the lateral expansion portions 22A and 22B is completed, the occupant D is omnidirectional in the front-rear and left-right directions. An airbag 20 is formed to cover the air bag 20. At this time, the sub-bags 23A and 23B are arranged at the position in front of the chest of the occupant D, but because of the initial stage of expansion, as shown by the arrow B in FIG. 12, the front parts of the lateral expansion portions 22A and 22B and the occupant are still present. There is a clearance (gap) between D and the head H, and the sub-bags 23A and 23B can easily descend to the position in front of the occupant's chest. After the lateral expansion portions 22A and 22B are deployed, the sub-bags 23A and 23B begin to expand, and as shown by the arrow C in FIG. 12, the sub-bags 23A and 23B expand in the direction of the chest of the occupant D and with the occupant D. Clearance is reduced.

Further, in the present embodiment, as described above, the pair of sub-bags 23A and 23B are communicated with each other by the communication holes 24 at the lower portions of the lateral expansion portions 22A and 22B when the expansion is completed, respectively. Therefore, after the lateral expansion portions 22A and 22B are deployed, sufficient gas is supplied to the lower portion of the lateral expansion portions 22A and 22B farthest from the gas supply source, and the lower portions of the lateral expansion portions 22A and 22B become. After sufficiently expanding, gas starts to be supplied to the sub-bags 23A and 23B from the lateral expansion portions 22A and 22B through the communication holes 24. As a result, the time difference between the expansion timings of the sub-bags 23A and 23B can be made larger than that of the lateral expansion portions 22A and 22B, and the delay can be surely delayed.

Then, in the seventh stage shown in FIG. 13, the deployment of the sub-bags 23A and 23B is completed, and the clearance between the occupant D and the chest is almost eliminated.

The first to third modification of the deployment timing control method of the subbags 23A and 23B will be described with reference to FIGS. 14 to 16. 14 to 16 correspond to the side sectional views of FIG.

In the first modification shown in FIG. 14, the communication hole 24 is closed with a pressure valve 27 that breaks at a predetermined pressure. The pressure valve 27 is broken by the internal pressure of the lateral expansion portions 22A and 22B that rises with the expansion of the lateral expansion portions 22A and 22B. As a result, the communication hole 24 is opened, and gas is supplied to the sub-bags 23A and 23B. With this configuration, it is possible to control the sub-bags 23A and 23B to expand after the lateral expansion portions 22A and 22B are deployed.

In the second modification shown in FIG. 15, the opening of the communication hole 24 is covered with the tube 28 inflatable by gas supply deflated, and the communication hole 24 is closed by suturing with the tearim 31. By supplying gas to the tube 28 to inflate the tube 28, the teame 31 is broken. As a result, the tube 28 is separated from the opening of the communication hole 24, the communication hole 24 is opened, and gas is supplied to the sub-bags 23A and 23B. With this configuration, it is possible to control the sub-bags 23A and 23B to expand after the lateral expansion portions 22A and 22B are deployed.

In the third modification shown in FIG. 16, a second inflator 32 different from the inflator 30 that supplies gas to the airbag 20 is provided, and the sub-bags 23A and 23B are expanded by the gas supplied from the second inflator 32. Take a configuration to make it. In this case, the sub-bags 23A and 23B do not communicate with the lateral expansion portions 22A and 22B. The second inflator 32 is installed in the seat 60 like the inflator 30, and is communicated with the sub-bags 23A and 23B by the supply path 33. In this configuration, by delaying the operation timing of the second inflator 32 from that of the inflator 30, it is possible to control the sub-bags 23A and 23B to expand after the lateral expansion portions 22A and 22B are deployed.

[Second Embodiment]
The second embodiment will be described with reference to FIGS. 17 to 27.

The configuration of the airbag device 100 according to the second embodiment will be described with reference to FIGS. 17 to 21. FIG. 17 is a perspective view of the airbag device 100 according to the second embodiment when the airbag is deployed. FIG. 18 is a side view of the airbag device 100 shown in FIG. FIG. 19 is a front view of the airbag device 100 shown in FIG. FIG. 20 is a schematic view showing a schematic configuration of the airbag 200 in FIGS. 17 to 19 in a plan view. FIG. 21 is a cross-sectional view taken along the line BB in FIG. 17 to 21 correspond to FIGS. 1 to 5 of the first embodiment.

As shown in FIGS. 17 to 21, in the airbag device 100 of the second embodiment, the sub-bag 210 of the airbag 200 is provided between the rear expansion portion 21 and the seat 60 (headrest 63). It is different from the first embodiment.

As shown in FIG. 21, the sub-bag 210 communicates with the lower part of the rear expansion portion 21 when the expansion is completed. The sub-bag 210 extends vertically from the lower end of the rear expansion portion 21 to at least the upper end position of the headrest 63. Further, as shown in FIG. 20, the sub-bag 210 extends at least over the width of the headrest 63 in the left-right width direction. As a result, the sub-bag 210 and the rear expansion portion 21 are doubly arranged behind the headrest 63.

The sub-bag 210 may be communicated with at least the rear expansion portion 21, and the communication position may be other than the lower part of the rear expansion portion 21.

After deploying the rear expansion portions 21 and the side expansion portions 22A and 22B, the sub-bag 210 expands so as to reduce the distance between the pair of side expansion portions 22A and 22B and the occupant D seated in the seat 60. More specifically, as shown in FIG. 21, it has a communication hole 211 that communicates between the sub-bag 210 and the rear expansion portion 21, and the sub-bag is expanded after the rear expansion portion 21 is expanded by adjusting the area of the communication hole 211. The 210 is controlled to inflate.

Similar to the first embodiment, the airbag device 100 of the second embodiment also includes such a sub-bag 210, so that the sub-bag 210 is provided during the deployment of the rear expansion portion 21 and the side expansion portions 22A and 22B. Is not yet inflated, so the clearance between the airbag 200 and the occupant D can be increased. As a result, during the deployment of the airbag 200, the airbag 200 can be prevented from interfering with the occupant D, and the airbag 200 can be easily interposed in front of the occupant D. Therefore, the airbag 200 can be smoothly placed on the front side of the occupant D. Can be expanded to. Further, as the sub-bag 210 expands on the rear side of the occupant D after the rear expansion portion 21 and the lateral expansion portions 22A and 22B are deployed, the clearance between the airbag 200 and the occupant D is increased after the airbag 200 is deployed. Can be made smaller. As a result, the airbag 200 can restrain the occupant D at an earlier timing, and the restraint property can be improved. Therefore, the airbag device 100 of the second embodiment can smoothly deploy the airbag 200 toward the front side of the occupant D, and can improve the restraint of the airbag 200 after deployment.

The procedure for deploying the airbag 200 by the airbag device 100 of the second embodiment will be described with reference to FIGS. 22 to 24. 22 to 24 are diagrams showing the fifth to seventh stages of the procedure for deploying the airbag 200 by the airbag device 100 according to the second embodiment, respectively. Since the first to fourth steps are the same as those of the first embodiment (FIGS. 7 to 10), the description thereof will be omitted.

In the fifth stage shown in FIG. 22, the front portions of the lateral expansion portions 22A and 22B are formed to cover the front portion of the head H of the occupant D. At this time, since the sub-bag 210 arranged between the rear expansion portion 21 and the seat 60 has not yet expanded, the front portions of the lateral expansion portions 22A and 22B and the occupant as shown by the arrow E in FIG. 22. The clearance (gap) between D and the head H is large. As a result, the airbag 200 can be easily deployed to the front side of the head H of the occupant D, and can easily cover the head D.

In the sixth stage shown in FIG. 23, the front portions of the lateral expansion portions 22A and 22B expand further downward, and when the deployment of the lateral expansion portions 22A and 22B is completed, the occupant D is omnidirectional in the front-rear and left-right directions. An airbag 20 is formed to cover the air bag 20. At this time, since the sub-bag 210 is in the initial stage of expansion, as shown by the arrow F in FIG. 23, there is still a clearance (gap) between the front portions of the lateral expansion portions 22A and 22B and the head H of the occupant D. be.

In the seventh stage shown in FIG. 24, the sub-bag 210 begins to expand after the lateral expansion portions 22A and 22B are expanded, and the sub-bag 210 expands rearward as shown by an arrow G in FIG. 24. As a result, as shown by the arrow H, the entire airbag 200 is moved rearward, the front portions of the lateral expansion portions 22A and 22B approach the occupant D side, and the front portions of the lateral expansion portions 22A and 22B. And the clearance between the occupant D and the occupant D are reduced. When the deployment of the sub-bag 210 is completed, the clearance with the chest of the occupant D is almost eliminated as shown in FIG. 24.

The first to third modification of the deployment timing control method of the subbag 210 will be described with reference to FIGS. 25 to 27. 25-27 correspond to the side sectional views of FIG.

In the first modification shown in FIG. 25, the communication hole 211 is closed with a pressure valve 212 that breaks at a predetermined pressure. The pressure valve 212 is broken by the pressure inside the rear expansion portion 21 that has increased with the expansion of the rear expansion portion 21. As a result, the communication hole 211 is opened and gas is supplied to the sub-bag 210. With this configuration, it is possible to control the sub-bag 210 to expand after the rear expansion portion 21 is deployed.

In the second modification shown in FIG. 26, the opening of the communication hole 211 is covered with the tube 213 inflatable by gas supply deflated, and the communication hole 211 is closed by suturing with the tearim 214. By supplying gas to the tube 213 to inflate the tube 213, the tearham 214 is broken. As a result, the tube 213 is separated from the opening of the communication hole 211 to open the communication hole 211, and gas is supplied to the sub-bag 210. With this configuration, it is possible to control the sub-bag 210 to expand after the rear expansion portion 21 is deployed.

In the third modification shown in FIG. 27, a second inflator 215 different from the inflator 30 that supplies gas to the airbag 200 is provided, and the sub-bag 210 is expanded by the gas supplied from the second inflator 215. Take. In this case, the sub-bag 210 does not communicate with the rear expansion portion 21. The second inflator 215 is installed in the seat 60 and communicates with the sub-bag 210 in the same manner as the inflator 30, for example. In this configuration, the operation timing of the second inflator 215 is delayed from that of the inflator 30, so that the sub-bag 210 can be controlled to expand after the rear expansion portion 21 is deployed.

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 provided 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.

10,100 Airbag device 20,200 Airbag 21 Rear expansion part 22A, 22B Lateral expansion part 23A, 23B, 210 Subbag 24, 211 Communication hole 27, 212 Pressure valve 28, 213 Tube 31, 214 Tear seam 30 Inflator 32 215 Second inflator 60 Seat D Crew

Claims (16)

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 that expands to reduce the distance between the pair of lateral expansion portions and the occupant seated in the seat after the rear expansion portion and the lateral expansion portion are deployed.
Equipped with an airbag. The sub-bag is provided on the center side of the seat and in front of the seat from the lateral expansion portion.
The airbag according to claim 1. The sub-bag communicates with the lower part of the lateral expansion portion when expansion is completed.
The airbag according to claim 2. The sub-bag extends from the lower end of the lateral expansion to at least the height in front of the occupant's chest.
The airbag according to claim 2 or 3. It has a communication hole that communicates between the sub-bag and the lateral expansion portion.
By adjusting the area of the communication hole, the sub-bag is controlled to expand after the expansion of the lateral expansion portion.
The airbag according to any one of claims 2 to 4. It has a communication hole that communicates between the sub-bag and the lateral expansion portion.
By closing the communication hole with a pressure valve that breaks at a predetermined pressure, and opening the communication hole by breaking the pressure valve due to the internal pressure of the lateral expansion portion that expands and rises. The sub-bag is controlled to inflate after the lateral inflatable portion is deployed.
The airbag according to any one of claims 2 to 4. It has a communication hole that communicates between the sub-bag and the lateral expansion portion.
The opening of the communication hole is covered with the inflatable tube deflated by the gas supply, and the communication hole is closed by suturing with a tea mesh.
By supplying gas to the tube to inflate the tube, the teame is broken, the tube is separated from the opening, and the communication hole is opened, so that the subbag is expanded after the lateral expansion portion is expanded. Is controlled to swell,
The airbag according to any one of claims 2 to 4. It has a second inflator that is separate from the inflator that supplies gas to the airbag.
By expanding the sub-bag with the gas supplied from the second inflator, the sub-bag is controlled to expand after the expansion of the lateral expansion portion.
The airbag according to any one of claims 2 to 4. In the panel view of the airbag, the rear expansion portion is arranged in the center, the lateral expansion portions are arranged inclined on both sides in the width direction of the rear expansion portion, and the lateral expansion portions are arranged from the end to the center. The sub-bag is placed facing the side,
The airbag according to any one of claims 2 to 7. The sub-bag is provided between the rear inflatable portion and the seat.
The airbag according to claim 1. The sub-bag communicates with the lower part of the rear expansion portion when expansion is completed.
The airbag according to claim 10. It has a communication hole that communicates between the sub-bag and the rear expansion portion.
By adjusting the area of the communication hole, the sub-bag is controlled to expand after the rear expansion portion is expanded.
The airbag according to claim 10 or 11. It has a communication hole that communicates between the sub-bag and the rear expansion portion.
The communication hole is closed with a pressure valve that breaks at a predetermined pressure, and the pressure valve breaks due to the internal pressure of the rear expansion portion that expands and rises to open the communication hole, thereby opening the communication hole. The sub-bag is controlled to inflate after the expansion of the inflatable portion.
The airbag according to claim 10 or 11. It has a communication hole that communicates between the sub-bag and the rear expansion portion.
The opening of the communication hole is covered with the inflatable tube deflated by the gas supply, and the communication hole is closed by suturing with a tea mesh.
By supplying gas to the tube and inflating the tube, the teame is broken and the tube is separated from the opening to open the communication hole, so that the sub-bag is released after the rear expansion portion is expanded. Controlled to inflate,
The airbag according to claim 10 or 11. It has a second inflator that is separate from the inflator that supplies gas to the airbag.
By expanding the sub-bag with the gas supplied from the second inflator, the sub-bag is controlled to expand after the rear expansion portion is expanded.
The airbag according to claim 10 or 11. Inflator and
The airbag according to any one of claims 1 to 15, which is developed by the gas supplied from the inflator, and the airbag.
An airbag device equipped with.

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