Air bag device

Abstract

To provide an air bag device capable of easily reducing a curvature radius of a recess formed in a lower wall of an air bag.SOLUTION: An air bag device 10 includes an air bag 50 having a rear wall part 50a that receives an occupant M when inflation is completed, an upper wall part 50b extending along a windshield 8 of a vehicle 1, and a lower wall part 50c facing the upper wall part 50b in a vertical direction and having a recess 50c1 that is recessed upward. The air bag 50 has: an upstream chamber 50x to which inflation gas is supplied from an inflator 14 through an opening 50h; and a downstream chamber 50y that is sewn and connected to the upstream chamber 50x and to which inflation gas is supplied from the upstream chamber 50x through a communication opening 50j. The recess 50c1 is formed by an outer peripheral part of the upstream chamber 50x and an outer peripheral part of the downstream chamber 50y.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an airbag device mounted in a vehicle. [Background technology]

[0002] An airbag device for protecting an occupant has been conventionally mounted on the instrument panel of a vehicle. The airbag device includes an airbag and an inflator that supplies inflation gas to the airbag. In response to a vehicle collision or the like, the airbag is supplied with inflation gas from the inflator, which causes the airbag to change from a folded state to an inflated state, and in the inflated state, it receives and protects the occupant.

[0003] Patent Document 1 also describes a configuration in which a recess that is recessed upward is provided on the lower wall of the airbag, so that when the airbag is fully inflated, a monitor that is attached to the instrument panel of the vehicle and displays images fits into the recess, preventing interference between the airbag and the monitor that would hinder the deployment of the airbag. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-7892 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the configuration described in Patent Document 1, since the airbag is configured with one chamber, the radius of curvature of the recess is likely to be large due to the sewing work. If the radius of curvature of the recess is large like this, when a vehicle-side component mounted on the vehicle, such as a monitor, is present around the recess, a gap is likely to be generated between the inner wall of the recess and the vehicle-side component. Also, when no vehicle-side component is present, a gap is likely to be generated between the two opposing inner walls that constitute the recess. In order to improve the protection performance of the occupant, it is desirable to have a configuration that makes these gaps as small as possible so that the airbag can easily obtain a reaction force from the monitor and the inner wall that constitutes the recess.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an airbag device that can easily reduce the radius of curvature of a recess formed in a lower wall portion of the airbag. [Means for solving the problem]

[0007] A representative configuration of an airbag device according to the present invention for solving the above problems is an airbag device mounted on a vehicle, which is folded and stored in an instrument panel of the vehicle, has a first opening for allowing inflation gas to flow in, and is inflated by being supplied with inflation gas through the first opening and is projected from the instrument panel toward an occupant, and has a rear wall portion that receives the occupant when inflation is complete, an upper wall portion that extends along a windshield of the vehicle and is connected to the rear wall portion at a rear end, and a recessed portion that faces the upper wall portion in the vertical direction and is recessed upward, and and an inflator that supplies the inflation gas to the airbag, wherein the airbag has a first chamber to which the inflation gas is supplied from the inflator through the first opening, and a second chamber that is connected to the first chamber by sewing, and to which the inflation gas is supplied from the first chamber through a second opening that communicates between the first chamber and the second chamber, and the recess is formed by an outer periphery of the first chamber and an outer periphery of the second chamber.

[0008] According to the present invention, in an airbag device, the radius of curvature of the recess formed in the lower wall of the airbag can be easily reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic perspective view of an instrument panel. [Diagram 2] FIG. 2 is a view of the area around the passenger seat of the vehicle as seen from the left side. [Diagram 3] FIG. 2 is a schematic cross-sectional view of the airbag device. [Figure 4] FIG. 2 is a schematic perspective view of the airbag when fully inflated. [Diagram 5] FIG. 2 is a plan view of a panel that constitutes the airbag. [Figure 6] FIG. 2 is a view of the area around the passenger seat of the vehicle with the airbag inflated, seen from the left side. [Figure 7] FIG. 2 is a view of the area around the passenger seat of the vehicle with the airbag inflated, seen from the left side. [Figure 8] FIG. 2 is a view of the area around the passenger seat of the vehicle with the airbag inflated, seen from the left side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the overall configuration of an airbag device 10 according to one embodiment of the present invention will be described with reference to the drawings. In the following description, the left-right direction means the left and right directions of a vehicle 1 equipped with the airbag device 10, specifically the left and right directions as seen by an occupant M seated in the passenger seat 3. The front-rear direction means the front and rear directions of the vehicle 1, specifically the front and rear directions as seen by an occupant M seated in the passenger seat 3. The up-down direction means the vertical upward and downward directions. Note that the dimensions, materials, shapes, etc. of components in the following description are not intended to limit the scope of the present invention to only those unless otherwise specified.

[0011] Fig. 1 is a schematic perspective view of an instrument panel 2 (hereinafter referred to as "instrument panel 2") of a vehicle 1. Fig. 2 is a diagram of the periphery of a passenger seat 3 of the vehicle 1 as viewed from the left side, showing the instrument panel 2 and the airbag device 10 in a cross section taken along the line AA shown in Fig. 1, and showing the outer shape of an airbag 50 at the time of complete inflation and the outer shape of an occupant M by a two-dot chain line. Fig. 3 is a schematic cross-sectional view of the airbag device 10.

[0012] As shown in Figs. 1 to 3, the airbag device 10 is mounted on an instrument panel 2 provided in front of a passenger seat 3 of a vehicle 1. The instrument panel 2 is held by a body (not shown) of the vehicle 1, and has a driver's seat side portion 2a located in front of a driver's seat (not shown), a passenger's seat side portion 2b located in front of the passenger seat 3, and a center portion 2c in front of a center console located between the driver's seat and the passenger seat 3. A monitor 4 (vehicle side member) capable of displaying images and videos is attached to a rear end surface 2b1 of the passenger's seat side portion 2b of the instrument panel 2. An upper portion of the monitor 4 is located at a position higher than an upper surface 2b2 of the instrument panel 2. In other words, the monitor 4 is attached to the instrument panel 2 so as to protrude upward from the instrument panel 2. The airbag device 10 is mounted on the passenger's seat side portion 2b, and protects an occupant M seated in the passenger seat 3.

[0013] The airbag device 10 includes an airbag 50, an inflator 14 that supplies inflation gas to the airbag 50, a case 15 that holds the airbag 50 and the inflator 14, and an airbag cover 20 that covers the upper part of the airbag 50 in a folded state.

[0014] The inflator 14 is a generally cylindrical member that generates inflation gas and has an outlet 14a at its upper portion for discharging the inflation gas. The inflator 14 also has a flange portion 14b that extends in the radial direction of the cylindrical shape from the surface where the outlet 14a is formed, as a portion that is connected to the case 15. The inflator 14 is electrically connected to a control device (not shown) by a lead wire (not shown), and is activated by an activation signal input from the control device via the lead wire to generate inflation gas.

[0015] The airbag 50 is a bag-shaped member, and is stored in a folded state inside the passenger seat side portion 2b of the instrument panel 2. An opening 50h (see FIG. 4) is formed on the underside of the airbag 50 in the folded state, through which the portion of the inflator 14 where the discharge port 14a is formed is inserted. In other words, the opening 50h is provided to allow the inflation gas discharged from the inflator 14 to flow into the airbag 50. A substantially rectangular annular retainer 12 for fixing the airbag 50 and the inflator 14 to the case 15 is also stored inside the airbag 50.

[0016] When inflation gas is supplied from the inflator 14 through the opening 50h, the airbag 50 inflates to close the gap between the instrument panel 2 and the windshield 8 of the vehicle 1. The airbag 50 at the time of full inflation includes a rear wall portion 50a arranged at the rear (directly in front of the occupant M) and configured to receive the occupant M moving forward, and an upper wall portion 50b arranged at the upper side, extending along the windshield 8 of the vehicle 1, and connected at the rear to an upper end portion 50a1 of the rear wall portion 50a. The airbag 50 at the time of full inflation also includes a lower wall portion 50c arranged at the lower side, facing the upper wall portion 50b in the vertical direction, and connected at the rear to a lower end portion 50a2 of the rear wall portion 50a, and a left wall portion 50d and a right wall portion 50e arranged at the left and right sides, respectively. The lower wall portion 50c is placed on the instrument panel 2 and the monitor 4 and supported by these members.

[0017] In addition, a recess 50c1 recessed upward is formed in the vicinity of the monitor 4 in the lower wall portion 50c of the airbag 50 to avoid interference with the monitor 4. The shape of the recess 50c1 is a downward approximately V-shape when viewed from the left-right direction. The recess 50c1 is formed by an inner wall 50c1a (first inner wall) extending obliquely upward from the front to the rear, and an inner wall 50c1b (second inner wall) extending obliquely downward from the rear end of the inner wall 50c1a to the rear, and the transition portion from the inner wall 50c1a to the inner wall 50c1b is the bottom portion 50c1c. Since the recess 50c1 recesses upward, the bottom portion 50c1c is the upper end portion of the recess 50c1. When the airbag 50 is fully inflated, the monitor 4 is disposed inside the recess 50c1.

[0018] The case 15 includes a bottom wall portion 15a in the shape of a substantially rectangular plate, and side wall portions 15b in the shape of a substantially square cylinder extending upward from the outer edge of the bottom wall portion 15a, and is connected to the body of the vehicle 1 by a bracket (not shown). The upper ends of the front and rear side wall portions 15b each form a hook-shaped hook portion 15b1. A plurality of hook portions 15b1 are provided on the front and rear side wall portions 15b so as to be aligned in the left-right direction. The bottom wall portion 15a also has an insertion hole (not shown) through which the inflator 14 is inserted.

[0019] The airbag 50 and the inflator 14 are fixed to the bottom wall 15a of the case 15 via the retainer 12 provided inside the airbag 50. Specifically, the periphery of the opening 50h of the airbag 50 is sandwiched between the lower surface of the retainer 12 and the upper surface of the bottom wall 15a of the case 15. The upper surface of the flange 14b of the inflator 14 is pressed against the lower surface of the bottom wall 15a of the case 15. In this state, the bolts 5 are inserted through screw holes formed in the periphery of the opening 50h of the airbag 50, the bottom wall 15a of the case 15, and the flange 14b of the inflator 14, respectively, and the nuts 13 are fastened. In this manner, the airbag 50 and the inflator 14 are fixed to the bottom wall 15a of the case 15.

[0020] The airbag cover 20 covers the upper part of the airbag 50 in a folded state, and when the airbag 50 inflates, a part of the airbag cover 20 breaks to form an opening 60 through which the airbag 50 is deployed. The airbag cover 20 is made of synthetic resin, and is composed of a base material 21 and a connecting part 22 connected to the back surface of the base material 21 by a screw or the like. The base material 21 is a member that constitutes the instrument panel 2, and extends to the driver's seat side part 2a and the central part 2c. In other words, the instrument panel 2 also serves as a part of the airbag cover 20.

[0021] The connecting portion 22 extends in a substantially horizontal direction along the base material 21 and has a top surface portion 22a connected to the rear surface of the base material 21, and a substantially rectangular tubular side wall portion 22b extending downward from the top surface portion 22a and disposed adjacent to the side wall portion 15b of the case 15. The front and rear side wall portions 22b are formed with a plurality of engagement holes 22b1 with which the plurality of hook portions 15b1 formed on the side wall portion 15b of the case 15 are respectively engaged. The airbag cover 20 and the case 15 are connected by the hook portions 15b1 being caught and engaged in the engagement holes 22b1.

[0022] A recess 22a1 is formed in the approximate center of the back surface of the top surface 22a in the front-rear direction, where the thickness is reduced. The front portion of the recess 22a1 in the top surface 22a is a door portion 22a2 that rotates upward about a corner 22a4 formed between the recess 22a1 and the front side wall portion 22b when the airbag 50 is inflated. Similarly, the rear portion of the recess 22a1 in the top surface 22a is a door portion 22a3 that rotates upward about a corner 22a5 formed between the recess 22a1 and the rear side wall portion 22b when the airbag 50 is inflated.

[0023] Next, an operation of the airbag device 10 during operation will be described. First, when a collision or the like of the vehicle 1 is detected by a sensor (not shown), an operation signal is input from a control device (not shown) to the inflator 14, which operates to generate inflation gas. This causes the inflation gas to flow into the airbag 50, and the airbag 50 begins to inflate.

[0024] Next, as the airbag 50 inflates, the airbag 50 comes into contact with the top surface portion 22a of the connecting portion 22 of the airbag cover 20. When the airbag 50 further inflates, the airbag 50 pushes the top surface portion 22a upward, and the top surface portion 22a breaks starting from the weak recessed portion 22a1 due to the pressing force of the airbag 50, and accordingly the portion of the base material 21 connected to the top surface portion 22a breaks.

[0025] Next, the corners 22a4 and 22a5 of the top surface 22a are deformed by the pressure from the airbag 50, and the door parts 22a2 and 22a3 of the top surface 22a are pushed up by the airbag 50 together with the broken base material 21 and rotate upward, forming an opening 60. The two-dot chain line shown in FIG. 3 indicates the state in which the door parts 22a2 and 22a3 of the top surface 22a and the base material 21 rotate upward. The airbag 50 is deployed from this opening 60 toward the occupant M seated in the passenger seat 3, and the airbag 50 completes its inflation. The occupant M, who moves forward, is then received by the inflated airbag 50 and protected.

[0026] Next, a detailed configuration of the airbag 50 will be described. Fig. 4 is a perspective schematic diagram of the airbag 50 when it has completed inflation. Fig. 5 is a plan view of a panel that constitutes the airbag 50. Fig. 6 is a diagram of the surroundings of the passenger seat 3 of the vehicle 1 when the airbag 50 is inflated, as viewed from the left side, with the outline of the occupant M indicated by a two-dot chain line.

[0027] As shown in Fig. 4, the airbag 50 has an opening 50h (first opening) and is configured with two chambers: an upstream chamber 50x (first chamber) to which inflation gas is supplied from the inflator 14 through the opening 50h, and a downstream chamber 50y (second chamber) to which inflation gas is supplied from the upstream chamber 50x through a communication port 50j (second opening) in the airbag 50. That is, the inflation gas generated by the inflator 14 first flows into the upstream chamber 50x located on the upstream side of the airbag 50 in the direction of the inflation gas flow, and then flows into the downstream chamber 50y located on the downstream side. The upstream chamber 50x and the downstream chamber 50y are formed separately, and the two are connected by sewing the downstream chamber 50y to the upstream chamber 50x.

[0028] When the airbag 50 is fully inflated, the upstream chamber 50x is disposed on the front side of the vehicle 1 and constitutes part of the upper wall portion 50b, part of the lower wall portion 50c, part of the left wall portion 50d, and part of the right wall portion 50e. The downstream chamber 50y is disposed on the rear side of the vehicle 1 and constitutes part of the upper wall portion 50b, part of the lower wall portion 50c, part of the left wall portion 50d, part of the right wall portion 50e, and the entire rear wall portion 50a. When the airbag 50 is fully inflated, the upstream chamber 50x and the downstream chamber 50y are disposed adjacent to each other in the front-rear direction.

[0029] Moreover, the outer periphery of the upstream chamber 50x constitutes an inner wall 50c1a of a recess 50c1 provided in the lower wall portion 50c of the airbag 50. The outer periphery of the downstream chamber 50y constitutes an inner wall 50c1b of the recess 50c1. In this manner, the recess 50c1 of the airbag 50 is formed by the outer periphery of the upstream chamber 50x and the outer periphery of the downstream chamber 50y.

[0030] 5, the airbag 50 is formed of an upstream main panel 61, an upstream left panel 62, and an upstream right panel 63 for forming an upstream chamber 50x, a downstream main panel 64, a downstream left panel 65, and a downstream right panel 66 for forming a downstream chamber 50y, and tethers 67 and 68. The tethers 67 and 68 are provided inside the airbag 50 and determine the shape of the airbag 50 when it is fully inflated. In this embodiment, the panels (61 to 66) and the tethers 67 and 68 are formed of flexible woven fabric made of polyester yarn, polyamide yarn, or the like.

[0031] The upstream main panel 61, the downstream main panel 64, and the tether 68 are provided with through holes 61h, 64h, and 68h for forming the communication port 50j (FIG. 4). The through holes 61h, 64h, and 68h are elongated holes with a larger opening area than a perfect circle so that air can easily pass through when the airbag 50 is inflated, and the communication port 50j is also elongated. When forming the airbag 50, first, the stitching portions 61x5, 64x5, and 68x1 on the periphery of the through holes 61h, 64h, and 68h are sewn together. Next, the stitching portion 68x2 of the tether 68 is sewn to the stitching portion 67x2 of the tether 67, and the stitching portion 67x1 of the tether 67 is sewn to the stitching portion 64x6 of the downstream main panel 64.

[0032] Next, the upstream main panel 61 is curved so that one end 61a and the other end 61b in the longitudinal direction of the upstream main panel 61 are brought closer to each other, and a seam 61x1 near the one end 61a and a seam 61x2 near the other end 61b are sewn together. At this time, the upstream main panel 61 is curved so that the tethers 67, 68 are disposed on the outside. As a result, the upstream main panel 61 becomes a cylinder that is open on the left and right sides.

[0033] Next, the upstream left panel 62 is placed in the left opening of the upstream main panel 61 so as to close the opening, and a seam 61x3 near one end 61c of the upstream main panel 61 in the width direction and a seam 62x1 near the periphery 62a of the upstream left panel 62 are sewn together. Similarly, the upstream right panel 63 is placed in the right opening of the upstream main panel 61 so as to close the opening, and a seam 61x4 near the other end 61d of the upstream main panel 61 in the width direction and a seam 63x1 near the periphery 63a of the upstream right panel 63 are sewn together. Note that the seam 62x1 of the upstream left panel 62 is not placed around the entire circumference, and a part of it is the outer seam 62x2. Similarly, the seam 63x1 of the upstream right panel 63 is not placed around the entire circumference, and a part of it is the outer seam 63x2. The outer seams 62x2, 63x2 are not sewn at this stage, but will be sewn from the outside of the airbag 50 at the end.

[0034] Next, the downstream main panel 64 is curved so that one end 64a and the other end 64b in the longitudinal direction of the downstream main panel 64 are brought closer to each other, and a seam 64x1 near the one end 64a and a seam 64x2 near the other end 64b are sewn together. At this time, the downstream main panel 64 is curved so that the tethers 67, 68 are disposed on the outside. This causes the downstream main panel 64 to have a cylindrical shape with openings on the left and right sides.

[0035] Next, the downstream left panel 65 is placed in the left opening of the downstream main panel 64 so as to close the opening, and a seam 64x3 near one end 64c of the downstream main panel 64 in the width direction and a seam 65x1 near the periphery 65a of the downstream left panel 65 are sewn together. Similarly, the downstream right panel 66 is placed in the right opening of the downstream main panel 64 so as to close the opening, and a seam 64x4 near the other end 64d of the downstream main panel 64 in the width direction and a seam 66x1 near the periphery 66a of the downstream right panel 66 are sewn together. Note that the seam 65x1 of the downstream left panel 65 is not placed around the entire circumference, and a part of it is the outer seam 65x2. Similarly, the seam 66x1 of the downstream right panel 66 is not placed around the entire circumference, and a part of it is the outer seam 66x2. The outer seams 65x2, 66x2 are not sewn at this stage, but will be sewn from the outside of the airbag 50 last.

[0036] Next, the integrated panels (61-66) and the tethers 67, 68 are turned inside out starting from the outer seams 62x2, 63x2, 65x2, 66x2 that have not yet been sewn together, so that the tethers 67, 68 are disposed on the inside. Finally, the periphery of the seams 61x1, 61x2 of the upstream main panel 61, the periphery of the seams 64x1, 64x2 of the downstream main panel 64, and the outer seams 62x2, 63x2, 65x2, 66x2 are sewn together linearly from the outside of the airbag 50 so that the airbag 50 is sealed. In this manner, the airbag 50 is formed.

[0037] The airbag 50 is formed by sewing the upstream chamber 50x and the downstream chamber 50y together, and the recess 50c1 is formed by the outer periphery of the chambers 50x and 50y, which provides the following effects. That is, if the airbag 50 is formed from a single chamber, it is necessary to operate a sewing machine or a sewing needle along the curvature of the recess 50c1 in order to sew the recess 50c1. Therefore, if the radius of curvature of the recess 50c1 is small, it is necessary to make a sudden turn of the sewing machine or the like during the sewing operation, which makes it easier for sewing errors to occur. On the other hand, if the radius of curvature of the recess 50c1 is increased in order to prevent sewing errors, a gap is more likely to occur between the inner walls 50c1a and 50c1b of the recess 50c1 and the monitor 4, making it difficult for the airbag 50 to obtain a reaction force from the monitor 4.

[0038] In contrast, in the present embodiment, the airbag 50 is formed by sewing the upstream chamber 50x and the downstream chamber 50y together, and the recess 50c1 is formed by the outer periphery of the upstream chamber 50x and the downstream chamber 50y. This allows the radius of curvature of the recess 50c1 to be set simply by adjusting the positional relationship between the upstream chamber 50x and the downstream chamber 50y, and therefore allows the recess 50c1 with a small radius of curvature to be easily formed without making a sharp turn with a sewing machine, etc. Therefore, as shown in Fig. 6, the gap S1 between the inner walls 50c1a, 50c1b of the recess 50c1 and the monitor 4 can be reduced, and the airbag 50 can easily obtain a reaction force from the monitor 4, thereby improving the protection performance of the occupant M.

[0039] In this embodiment, the airbag device 10 is mounted on the vehicle 1 having the monitor 4, but the present invention is not limited to this. That is, the same effect as above can be obtained even if the airbag device 10 is mounted on the vehicle 1 not having the monitor 4 shown in FIG. 7 or on the vehicle 1 in which the monitor 4 is located so as not to interfere with the airbag 50. That is, in such a configuration, if the radius of curvature of the recess 50c1 is large, a gap is likely to be generated between the inner walls 50c1a, 50c1b of the recess 50c1, and the airbag 50 is less likely to obtain the reaction force generated by the contact between the inner walls 50c1a, 50c1b. In contrast, according to the airbag device 10 of this embodiment, the gap S2 (FIG. 7) between the inner walls 50c1a, 50c1b of the recess 50c1 can be made small, so that the airbag 50 is more likely to obtain the reaction force caused by the contact between the inner walls 50c1a, 50c1b, and the protection performance of the occupant M can be improved.

[0040] In addition, in this embodiment, the configuration in which the upstream chamber 50x and the downstream chamber 50y are disposed adjacent to each other in the front-rear direction when the airbag 50 is fully inflated has been described, but the present invention is not limited to this. That is, as shown in FIG. 8, the same effect as above can be obtained even if the upstream chamber 50x and the downstream chamber 50y are disposed adjacent to each other in the up-down direction when the airbag 50 is fully inflated. The configuration shown in FIG. 8 is realized by making the upstream chamber 50x larger and the downstream chamber 50y smaller than the configurations shown in FIGS. 1 to 7. Such a positional relationship between the upstream chamber 50x and the downstream chamber 50y is determined depending on the positional relationship between the airbag 50 and other members of the vehicle 1, etc.

[0041] In addition, in the present embodiment, the configuration in which the recess 50c1 is provided in the lower wall portion 50c of the airbag 50 to avoid interference between the airbag 50 and the monitor 4 has been described, but the present invention is not limited to this, and the recess 50c1 may be provided in the lower wall portion 50c of the airbag 50 to avoid interference with other members protruding upward from the instrument panel 2. Also, the same effect as above can be obtained by mounting the airbag device 10 on the driver's seat side portion 2a in front of the driver's seat in the instrument panel 2 and providing the recess 50c1 in the lower wall portion 50c of the airbag 50 to avoid interference with vehicle side members such as the steering wheel of the vehicle 1 disposed behind the instrument panel 2. [Explanation of symbols]

[0042] REFERENCE SIGNS LIST 1...vehicle, 2...instrument panel, 4...monitor (vehicle side member), 8...windshield, 10...airbag device, 14...inflator, 50...airbag, 50a...rear wall, 50b...upper wall, 50c...lower wall, 50c1...recess, 50c1a...inner wall (first inner wall), 50c1b...inner wall (second inner wall), 50h...opening (first opening), 50j...communication port (second opening), 50x...upstream chamber (first chamber), 50y...downstream chamber (second chamber), M...occupant

Claims

1. In an airbag device mounted in a vehicle, an airbag that is folded and stored in an instrument panel of the vehicle, has a first opening for allowing inflation gas to flow in, and is inflated by being supplied with inflation gas through the first opening and projected from the instrument panel toward an occupant, the airbag comprising: a rear wall portion that receives an occupant when inflation is complete; an upper wall portion that extends along a windshield of the vehicle and is connected to the rear wall portion at a rear end; and a lower wall portion that faces the upper wall portion in the vertical direction, has a recess that is recessed upward, and is connected to the rear wall portion at a rear end; an inflator for supplying the inflation gas to the airbag; Equipped with The airbag comprises: a first chamber to which the inflation gas is supplied from the inflator through the first opening; a second chamber connected to the first chamber by sewing, the second chamber being supplied with the inflation gas from the first chamber through a second opening that connects the first chamber to the second chamber; The airbag device according to claim 1, wherein the recess is defined by an outer periphery of the first chamber and an outer periphery of the second chamber.

2. 2. The airbag device according to claim 1, wherein an outer periphery of the first chamber constitutes a first inner wall of the recess, and an outer periphery of the second chamber constitutes a second inner wall facing the first inner wall of the recess.

3. 2. The airbag device according to claim 1, wherein the first chamber and the second chamber are disposed adjacent to each other in the front-rear direction when the airbag is fully inflated.

4. 2. The airbag device according to claim 1, wherein the first chamber and the second chamber are disposed adjacent to each other in the vertical direction when the airbag is fully inflated.

5. 2. The airbag device according to claim 1, wherein the second opening is an elongated hole.

6. 6. The airbag device according to claim 1, wherein a vehicle-side member mounted on the vehicle is disposed inside the recess when the airbag is fully inflated.

7. 7. The airbag device according to claim 6, wherein the vehicle-side member is a monitor that is attached to the instrument panel and displays an image.

8. 7. The airbag device according to claim 6, wherein the vehicle side member is a steering wheel.

Images