Airbag device

Abstract

To provide an airbag device capable of improving deployment performance of an airbag which is inflated and deployed from a seat rear side of an upper part of a vehicle seat toward a seat front side.SOLUTION: An airbag device 10 comprises: an inflator 44 for generating gas upon collision of a vehicle; and an airbag 32 to which the gas is supplied, and which is inflated and deployed from a seat rear side of an upper part of a vehicle seat 12 toward a seat front side, and passes through between a ceiling 24 of a cabin R and a head H of an occupant D seated in the vehicle seat 12. The airbag 32 comprises at least one gas supply passage 60 which is provided toward the seat front side, and in which an angle of incidence θ1 with respect to the ceiling 24 of the cabin R is set to an acute angle in a side view seen from a seat width direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an airbag device. [Background technology]

[0002] The airbag device disclosed in the following Patent Document 1 includes an inflator and an airbag that is inflated by gas supplied from the inflator. The airbag has a rear inflatable portion that is inflated on the back side of the seat, a pair of side inflatable portions that extend forward from both sides of the rear inflatable portion in the seat width direction, and a pair of front inflatable portions that extend from the pair of side inflatable portions toward the center and are connected to each other at the center to cover the front of the occupant. When gas begins to be supplied to this airbag, it is inflated toward the front side of the seat so as to climb over the headrest. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-218013 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the airbag device disclosed in the above-mentioned Patent Document 1, an inflator and an airbag are stored in a storage section in a seat back. When gas starts to be supplied from the inflator, the airbag breaks the surface of the seat back, advances to the rear side of the seat, and starts to deploy upward and rearward of the seat. Therefore, it is considered that the airbag may get caught on the ceiling of the vehicle cabin at the beginning of the inflation and deployment. In addition, the position of the head of an occupant seated in a vehicle seat varies in the vertical direction of the seat depending on the occupant's physique and the situation at the time of the vehicle collision. Therefore, when the airbag deploys to the front side of the seat so as to climb over the headrest, it may get caught on the occupant's head. Therefore, there is room for improvement in terms of improving the deployment performance of the airbag.

[0005] SUMMARY OF THE PRESENT INVETION The present invention has been made in consideration of the above circumstances, and has an object to provide an airbag device capable of improving the deployment performance of an airbag that inflates and deploys from the rear side of an upper portion of a vehicle seat to the front side of the seat. [Means for solving the problem]

[0006] The airbag device of the first embodiment includes an inflator that generates gas in the event of a vehicle collision, and an airbag that is supplied with the gas and inflates and deploys from the rear side of the upper part of the vehicle seat to the front side of the seat, passing between the ceiling of the vehicle compartment and the head of an occupant seated in the vehicle seat, and has at least one gas supply path that is arranged toward the front side of the seat and has an acute angle of incidence with respect to the ceiling when viewed from the side in the seat width direction.

[0007] In the airbag device of the first aspect, gas generated from an inflator is supplied to the airbag when the vehicle crashes. As a result, the airbag is inflated and deployed from the rear side of the upper part of the vehicle seat to the front side of the seat, passing between the ceiling of the vehicle compartment and the head of an occupant seated in the vehicle seat. Here, the airbag has at least one gas supply passage provided toward the front side of the seat, and the gas supply passage is set to have an acute angle of incidence with respect to the ceiling in a side view seen from the width direction of the seat. As a result, the airbag can be deployed in a direction that forms an acute angle with the ceiling in a side view, so that the airbag is prevented from getting caught on the ceiling of the vehicle compartment. In addition, since the airbag is deployed obliquely upward from the upper part of the vehicle seat, interference with the head of the occupant is also prevented at the upper side of the vehicle seat. As a result, the deployment performance of the airbag that inflates and deploys from the rear side of the upper part of the vehicle seat to the front side of the seat can be improved.

[0008] In the airbag device of the second aspect, in the first aspect, the incident angle is set to 15° to 35°.

[0009] In the airbag device of the second embodiment, the angle of incidence of the gas supply passage with respect to the ceiling of the vehicle compartment is set to an acute angle in the range of 15° to 35°, thereby improving the deployment performance of the airbag that inflates and deploys from the rear side of the upper part of the vehicle seat to the front side of the seat.

[0010] The airbag device of the third aspect is the first or second aspect, wherein the airbag has a front-rear chamber having a pair of front-rear extending portions that inflate and deploy toward the front of the seat by passing through both the left and right sides of the head of an occupant seated in the vehicle seat, and a front-rear chamber having a front connecting portion that connects the front ends of the pair of front-rear extending portions in the seat width direction, and an airbag body that inflates and deploys toward the occupant on the seat rear side of the front connecting portion after the front-rear chambers, and is compressed in the seat fore-and-aft direction while extending the front-rear chambers in the seat fore-and-aft direction when the occupant is restrained.

[0011] In the airbag device of the third aspect, the airbag has a front and rear chamber and an airbag body. The front and rear chambers pass through both the left and right sides of the head of an occupant seated in the vehicle seat, and the pair of left and right front and rear extending parts inflate and deploy toward the front side of the seat. Then, a front connecting part connecting the front end parts of the pair of front and rear extending parts in the seat width direction passes between the ceiling of the vehicle compartment and the head of the occupant, and is disposed in front of the occupant. After that, the airbag body is configured to inflate and deploy toward the occupant side on the seat rear side of the front connecting part after the front and rear chambers. As a result, when gas is supplied from the gas supply path, the pair of left and right front and rear extending parts are deployed in a direction that forms an acute angle with the ceiling of the vehicle compartment, so that the front connecting part and the airbag body are prevented from getting caught on the ceiling of the vehicle compartment. In addition, the front connecting part and the airbag body are deployed obliquely upward from the upper part of the vehicle seat, so that interference with the head of the occupant is also prevented at the upper side of the vehicle seat. When an occupant is restrained, the airbag body is compressed in the front-rear direction of the seat while expanding the front-rear chambers in the front-rear direction of the seat. The airbag can improve its energy absorption performance by compressing and deforming the airbag body.

[0012] The airbag device of the fourth aspect is the third aspect, wherein the gas supply passage includes a first gas supply passage and a second gas supply passage provided at the rear end portions of the pair of front-to-rear extending portions, and the first gas supply passage and the second gas supply passage are inclined outward in the seat width direction so as to have a predetermined inclination angle with respect to the seat front-to-rear direction in a plan view.

[0013] In the airbag device of the fourth aspect, the gas supply passage includes a first gas supply passage and a second gas supply passage provided at the rear end of the pair of front-rear extending portions. The first gas supply passage and the second gas supply passage are inclined outward in the seat width direction so as to have a predetermined inclination angle with respect to the seat front-rear direction in a plan view. Therefore, when gas is supplied from the first gas supply passage and the second gas supply passage, the pair of front-rear extending portions pass through both the left and right sides of the occupant's head, and are inflated and deployed obliquely toward the front side of the seat and outward in the seat width direction. This suppresses interference between the pair of front-rear extending portions and the occupant's head on the sides of the vehicle seat, even if the position of the occupant's head is biased in the seat width direction.

[0014] In the airbag device of the fifth aspect, the inclination angle of the first gas supply passage and the second gas supply passage with respect to the seat front-rear direction in the fourth aspect is set to 10° to 45°. This suppresses interference with the head of the occupant on the side of the vehicle seat, and improves the deployment performance of the airbag that inflates and deploys from the seat rear side to the seat front side at the upper part of the vehicle seat.

[0015] The airbag device of a sixth aspect is any one of the third to fifth aspects, wherein the front and rear chambers are housed on the seat rear side of the airbag body before the gas is supplied, and further includes a rear connecting portion connecting rear ends of the pair of front and rear extending portions in the seat width direction.

[0016] In the airbag device of the sixth aspect, the front and rear chambers have a rear connecting portion that connects the rear ends of the pair of front and rear extending portions in the seat width direction. This rear connecting portion is housed on the seat rear side of the airbag body before gas is supplied. As a result, when gas is supplied from the gas supply path, the rear connecting portion inflates on the seat rear side of the airbag body, and the airbag body can be pushed toward the seat front side. As a result, the robustness of the airbag body when inflated and deployed is improved, and the behavior when passing through between the ceiling of the vehicle compartment and the head of the occupant can be stabilized.

[0017] The airbag device of a seventh aspect is the airbag device of the sixth aspect, wherein the gas supply passage includes a third gas supply passage connected to a rear side surface of the rear connecting portion.

[0018] In the airbag device of the seventh aspect, the gas supply passage includes a third gas supply passage connected to the rear side surface of the rear connecting portion. This allows the rear connecting portion to be rapidly inflated and deployed toward the front side of the seat through the third gas supply passage. This allows the airbag body to be pushed out in a direction that forms an acute angle with the ceiling of the vehicle compartment in the early stage of inflation and deployment, and further stabilizes the behavior of the airbag body when it passes between the ceiling of the vehicle compartment and the head of the occupant. Effect of the Invention

[0019] As described above, the airbag device according to the present invention can improve the deployment performance of the airbag that inflates and deploys from the rear side of the upper portion of the vehicle seat to the front side of the seat. [Brief description of the drawings]

[0020] [Figure 1] 1 is a perspective view showing a state in which an airbag is inflated and deployed in an airbag device according to the present embodiment. FIG. [Diagram 2] 2 is a side view showing the configuration shown in FIG. 1 as viewed from the left side of the vehicle. [Diagram 3] 2 is a plan view showing the configuration shown in FIG. 1 as viewed from above the vehicle. [Figure 4] 2 is a front view showing the configuration shown in FIG. 1 as viewed from the front of the vehicle. [Diagram 5] 5 is a front view showing the airbag in FIG. 4 in a see-through state. FIG. [Figure 6] 4 is a development view of a region corresponding to a pair of front and rear extending portions and a front connecting portion of front and rear chambers of the airbag. FIG. [Figure 7] FIG. 2 is a development view of an airbag body provided in the airbag. [Figure 8] 1 is a development view of a portion corresponding to a rear connection portion of front and rear chambers of the airbag. FIG. [Figure 9] FIG. 4 is a side view showing an initial state of the airbag being inflated and deployed. [Figure 10] FIG. 4 is a side view showing a state immediately after inflation and deployment of the airbag is completed. [Figure 11] FIG. 4 is a side view showing an initial state of restraining an occupant by an airbag. [Figure 12] FIG. 4 is a side view showing a middle stage of restraining an occupant with an airbag. [Figure 13] FIG. 4 is a side view showing a later state of occupant restraint by the airbag. [Figure 14] 11 is a side view for explaining the effect of the rear tether in suppressing the swinging of the airbag. FIG. [Figure 15] 11 is a side view for explaining contact of the front and rear chambers with the shoulders of an occupant. FIG. [Figure 16] 13 is a side view for explaining the effect of suppressing the oscillation of the airbag by the front upper tether. FIG. [Figure 17] 11 is a side view for explaining the effect of suppressing the oscillation of the airbag by the front lower tether. FIG. [Figure 18] 13 is a side view showing an example in which the attachment position of the front upper tether is inappropriate, and shows the state immediately before the occupant is restrained by the airbag. FIG. [Figure 19] 13 is a side view showing an example in which the attachment position of the front upper tether is inappropriate, and shows a state in a later stage in which the occupant is restrained by the airbag. FIG. [Figure 20]FIG. 13 is an enlarged cross-sectional view showing an example in which some of the multiple base fabrics constituting the front and rear chambers are made of base fabrics that are difficult to stretch. [Figure 21] 4 is a diagram showing the relationship between the load acting on the thorax of an occupant and the displacement of the thorax. [Figure 22] FIG. 11 is a partially enlarged side view of a main portion of an airbag device according to a modified example, showing the airbag in an inflated and deployed state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] <First embodiment> Hereinafter, an occupant protection device 10 according to a first embodiment of the present invention and an airbag device 30 mounted on the occupant protection device 10 will be described with reference to Figs. 1 to 21. In each drawing, some reference numerals may be omitted to make the drawing easier to see. Arrows FR, UP, LH, and RH appropriately indicated in each drawing indicate the forward direction (traveling direction), upward direction, leftward direction, and rightward direction of the vehicle, respectively. Hereinafter, when the directions of front-rear, left-right, and up-down are simply used in the description, they refer to front-rear in the front-rear direction of the vehicle, left-right in the left-right direction of the vehicle, and up-down in the up-down direction of the vehicle, unless otherwise specified.

[0022] As shown in Figs. 1 to 5, the passenger protection device 10 is composed of a vehicle seat 12 and an airbag device 30. The vehicle seat 12 is a front seat or a rear seat of a vehicle (automobile). The vehicle seat 12 has a seat cushion 14, a seat back 16 erected above the rear end of the seat cushion 14, and a headrest 18 connected to the upper end of the seat back 16. The front-rear, left-right, top-bottom directions of the vehicle seat 12 coincide with the front-rear, left-right, top-bottom directions of the vehicle.

[0023] 1 to 5, a crash test dummy D is shown seated on a seat cushion 14 of a vehicle seat 12 as a model of an occupant (seater) to be protected. The dummy D is, for example, an AM50 (50th percentile of American adult males) frontal crash test dummy (Hybrid III). The dummy D is seated in a standard seating position defined by the crash test method, and the vehicle seat 12 is located at a reference setting position corresponding to the seating position. Hereinafter, for ease of understanding, the dummy D will be referred to as an "occupant D."

[0024] An occupant D seated on the seat cushion 14 of the vehicle seat 12 is restrained to the vehicle seat 12 by a seat belt 22 (see Figs. 1 to 3; not shown in Figs. 4 and 5) provided in a seat belt device 20. The seat belt device 20 is a three-point seat belt device, and is a so-called seat-mounted seat belt device in which a retractor, an anchor, and a buckle (reference numbers omitted) (not shown) are provided on the vehicle seat 12.

[0025] The airbag device 30 includes an airbag 32, a plurality of inflators 44 (see Figs. 2 and 3), and a module case 46 (not shown in Figs. 10 to 20). The airbag 32 is normally stored in a folded state together with the plurality of inflators 44 in the module case 46. The module case 46 is formed in a hollow rectangular parallelepiped shape. The module case 46 is disposed behind the upper part of the vehicle seat 12 (more specifically, behind the upper end of the seat back 16 and the headrest 18) and is fixed to the upper end of the seat back 16 or to the vehicle body (not shown).

[0026] The airbag 32 receives gas from a pair of inflators 44 and inflates (deploys and inflates) from the rear side of the upper part of the vehicle seat 12 to the front side. The airbag 32 has a front-rear chamber 34 and an airbag body 40. The front-rear chamber 34 has a pair of left and right front-rear extending parts 34A that inflate and deploy forward through both the left and right sides of the head H of the occupant D, and a front connecting part 34B that connects the front end parts of the pair of front-rear extending parts 34A in the left-right direction. The front-rear chamber 34 also has a rear connecting part 34D that connects the rear end parts of the pair of front-rear extending parts 34A in the left-right direction. The airbag body 40 inflates and deploys toward the occupant D side (rear side) behind the front-rear chamber 34 on the rear side of the front connecting part 34B.

[0027] The front and rear chambers 34 are formed into a long bag shape by overlapping two long pieces of base fabric 36, 38 shown in FIG. 6 and sewing the peripheral parts at the sewing part S1. The airbag body 40 is formed into a bag shape by folding one piece of base fabric 42 shown in FIG. 7 along four folding lines L1, L2, L3, L4 and sewing at the sewing part S2. At the sewing part S2, the sewing line SL21 and the sewing line SL22 are sewn, the sewing line SL23 and the sewing line SL24 are sewn, the sewing line SL25 and the sewing line SL26 are sewn, and the sewing line SL27 and the sewing line SL28 are sewn. The above-mentioned base fabrics 36, 38, 42 are made of, for example, a nylon-based or polyester-based cloth material. One or both of the two pieces of base fabric 36, 38 constituting the front and rear chambers 34 are made of a base fabric less stretchable than the base fabric 42 constituting the airbag body 40.

[0028] Both longitudinal ends of the front and rear chambers 34 are provided with a pair of left and right inflator housing sections 34C that house a pair of inflators 44. A gas supply path 60 that supplies gas from the inflators 44 to the front and rear chambers 34 is formed inside the pair of inflator housing sections 34C. The gas supply path 60 is formed by disposing a tubular diffuser 70 inside the inflator housing section 34C. The diffuser 70 is manufactured from, for example, a metal pipe, and has a straight section that faces the front and rear chambers 34. The straight gas supply path 60 is formed by fixing a gas outlet (reference number omitted) of the inflator 44 to the longitudinal ends of the diffuser 70.

[0029] The longitudinal center of the front and rear chambers 34 is a front connecting portion 34B, and the portions between the front connecting portion 34B and the pair of inflator housing portions 34C are front and rear extending portions 34A. The pair of inflators 44 are combustion-type or cold gas-type cylinder-type inflators, and generate gas when activated. The activation of these inflators 44 is controlled by a control device (not shown), and generates gas when the vehicle collides.

[0030] Here, the pair of inflator housings 34C are arranged separately on the left and right sides in the module case 46. The gas supply passages 60 provided in each inflator housing 34C are provided toward the front side of the seat. In addition, the gas supply passages 60 extend obliquely toward the front side of the seat and toward the upper side of the seat when stored in the module case 46. Particularly, in this embodiment, the gas supply passages 60 are set to have an acute angle of incidence θ1 with respect to the ceiling 24 of the vehicle compartment R in a side view seen from the seat width direction.

[0031] The incident angle θ1 of the gas supply path 60 is set within a range of 15° to 35°, and more preferably, is set to 25°.

[0032] Hereinafter, as necessary, the gas supply passage 60 provided at the rear end of the front-rear extension portion 34A at one longitudinal end side of the front-rear chamber 34 will be referred to as the first gas supply passage 60A, and the gas supply passage 60 provided at the rear end of the front-rear extension portion 34A at the other longitudinal end side of the front-rear chamber 34 will be referred to as the second gas supply passage 60B.

[0033] As shown in FIG. 3, the first gas supply passage 60A and the second gas supply passage 60B are inclined outward in the sheet width direction so as to have a predetermined inclination angle θ2 with respect to the sheet front-rear direction in a plan view.

[0034] The inclination angle θ2 of the first gas supply path 60A and the second gas supply path 60B with respect to the seat front-rear direction is set within a range of 10° to 45°, and more preferably, is set to 15°.

[0035] The inflator 44 is disposed facing the front side of the seat and with its axis direction inclined toward the upper side of the seat with respect to the seat front-rear direction by being partially or entirely inserted into the gas supply passage 60. That is, each inflator 44 is disposed in a position in which the angle of incidence θ1 with respect to the ceiling 24 of the passenger compartment R in a side view seen from the seat width direction is set to an acute angle similar to that of the gas supply passage 60.

[0036] A pair of stud bolts are provided, for example, at both axial ends of each inflator 44. The pair of stud bolts pass through the inflator housing 34C, the module case 46, and a bracket (not shown) supported by the frame of the seat back 16, and a nut is screwed onto each stud bolt. This fixes the inflator housing 34C, the inflator 44, and the module case 46 to the frame of the seat back 16.

[0037] Each of the pair of front and rear extending portions 34A is formed in a long tubular shape. The front connecting portion 34B is formed in a substantially T-shaped bag shape that communicates with each of the front and rear extending portions 34A. The front connecting portion 34B is sewn to the airbag body 40 at a sewing portion S3 (see Figs. 6 and 7) provided in the center of the front connecting portion 34B. The sewing portion S3 is formed in a substantially inverted trapezoid shape, for example. A communication hole 48 that communicates the inside of the front connecting portion 34B with the inside of the airbag body 40 is formed on the inside of the sewing portion S3. The communication hole 48 is formed in a substantially inverted trapezoid shape, for example. The communication hole 48 is composed of a through hole 50 formed in the base cloth 36 of the front and rear chambers 34 and a through hole 52 formed in the base cloth 42 of the airbag body 40.

[0038] As shown in FIG. 8, the rear connecting portion 34D is formed into a long tube shape by overlapping two long base fabrics 64, 65 and sewing the widthwise ends at the sewing portion S5. The rear connecting portion 34D is sewn to the rear ends of the pair of front and rear extending portions 34A at the sewing portion S4 provided at both ends in the longitudinal direction of the rear connecting portion 34D. As shown in FIG. 6, a communication hole 66 is formed on the inside of the sewing portion S4, which communicates the inside of the rear connecting portion 34D with the inside of the pair of front and rear extending portions 34A. The communication hole 66 is, for example, substantially circular. The communication hole 66 is formed by a through hole 53 formed in the base fabric 36 of the front and rear chambers 34.

[0039] A tubular diffuser 70 is connected to the longitudinal center of the rear connecting portion 34D. The diffuser 70 is, for example, manufactured from a metal pipe and has a straight section toward the rear connecting portion 34D. One longitudinal end of the diffuser 70 is connected to a communication hole 67 formed in the longitudinal center of the rear connecting portion 34D. The inside of the diffuser 70 communicates with the inside of the rear connecting portion 34D via the connection hole 67. The communication hole 67 is, for example, substantially circular. The communication hole 67 is configured by a through hole 68 formed in the base fabric 65 constituting the rear side surface of the rear connecting portion 34D.

[0040] The diffuser 70 having the above-mentioned configuration is disposed at the center in the seat width direction within the module case 46, and a pair of inflator accommodating portions 34C are disposed on both the left and right sides of the diffuser 70. The diffuser 70 constitutes a gas supply passage 60 connected to the rear side surface of the rear connecting portion 34D.

[0041] Hereinafter, the gas supply path 60 formed by the diffuser 70 will be referred to as a third gas supply path 60C as necessary. The third gas supply path 60 forms a linear flow path, and is provided toward the seat front side, similar to the above-mentioned first gas supply path 60A and second gas supply path 60B. In addition, the third gas supply path 60C extends obliquely toward the seat front side and toward the seat upper side in a state where it is stored in the module case 46. In addition, the third gas supply path 60C has an incident angle θ1 with respect to the ceiling 24 of the vehicle interior R set to an acute angle in a side view seen from the seat width direction.

[0042] In this embodiment, the third gas supply passage 60C is disposed above the seat relative to the first gas supply passage 60A and the second gas supply passage 60B when housed in the module case 46. A gas ejection portion (reference numeral omitted) of the inflator 44 is fixed to the other end in the longitudinal direction of the diffuser 70 constituting the third gas supply passage 60C.

[0043] The inflator 44 is disposed toward the front side of the seat by being partially or entirely inserted into the third gas supply passage 60C, and disposed in a position in which the axial direction is inclined toward the seat upper side with respect to the seat front-rear direction. That is, the inflator 44 is disposed in a position in which the incident angle θ1 with respect to the ceiling 24 of the vehicle compartment R is set to an acute angle similar to that of the third gas supply passage 60C in a side view seen from the seat width direction. The inflator 44 is provided with a pair of stud bolts at both ends in the axial direction, for example. The pair of stud bolts penetrate the diffuser 70, the module case 46, and a bracket (not shown) supported by the frame of the seat back 16, and a nut is screwed onto each stud bolt. As a result, the diffuser 70, the inflator 44, and the module case 46 are fixed to the frame of the seat back 16.

[0044] The pair of front and rear extending portions 34A, the front connecting portion 34B, the rear connecting portion 34D, and the airbag body 40 are normally folded in a predetermined manner such as roll folding or bellows folding and housed in a module case 46. The rear connecting portion 34D is housed on the seat rear side of the airbag body 40 in a state housed in the module case 46, i.e., in a state before gas is supplied from the inflator 44 (see FIG. 9). A diffuser 70 constituting the third gas supply passage 60C is housed on the seat rear side of the airbag body 40 via the rear connecting portion 34D.

[0045] When the multiple inflators 44 (three in this embodiment) are activated, gas is generated in the first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60C. The gas generated in the first gas supply path 60A and the second gas supply path 60B flows through the pair of inflator accommodating portions 34C and the pair of front and rear extending portions 34A toward the front connecting portion 34B, and is supplied into the airbag main body 40 through the communication hole 48. As a result, the airbag 32 inflates and deploys in the order of the pair of front and rear extending portions 34A, the front connecting portion 34B, and the airbag main body 40.

[0046] On the other hand, the gas generated in the third gas supply passage 60C inflates the rear connecting portion 34D through the communication hole 67, flows through the pair of front and rear extending portions 34A to the front connecting portion 34B side, and is supplied to the airbag main body 40 through the communication hole 48. As a result, the gas supplied from the third gas supply passage 60C is supplied to the airbag 32 in the order of the rear connecting portion 34D, the pair of front and rear extending portions 34A, the front connecting portion 34B, and the airbag main body 40, thereby assisting the inflation and deployment of the airbag 32.

[0047] When the airbag 32 inflates and deploys, a tear line (not shown) formed on the module case 46 is configured to rupture under the inflation pressure of the airbag 32. This allows the airbag 32 to inflate and deploy to the outside of the module case 46.

[0048] 9, a guide portion 46A is integrally provided on the upper portion of the module case 46, the guide portion 46A extending further forward and upward than the first gas supply passage 60A, the second gas supply passage 60B, and the third gas supply passage 60C of the airbag 32. The guide portion 46A forms a guide surface having an acute angle of incidence θ1 with respect to the ceiling 24 of the vehicle compartment R in a side view seen from the seat width direction, and guides the airbag 32 in the forward and upward deployment direction when the airbag 32 is inflated and deployed outside the module case 46, thereby improving robustness. The module case 46 may be integrally formed with a backboard that constitutes the back surface of the seat back 16.

[0049] 9, in the initial stage of the inflation and deployment of the airbag 32, gas is supplied from the first gas supply passage 60A and the second gas supply passage 60B, and the pair of front and rear extensions 34A of the front and rear chamber 34 are inflated and deployed toward the front and upper side of the seat. At this time, the deployment direction of the pair of front and rear extensions 34A is a direction that forms an acute angle with the ceiling 24 of the vehicle compartment R. Also, at this time, the deployment direction of the pair of front and rear extensions 34A is a direction that is inclined outward in the seat width direction with respect to the seat front and rear direction in a plan view.

[0050] Meanwhile, the rear connecting portion 34D of the front-rear chamber 34 receives gas supply from the third gas supply passage 60C and inflates and deploys toward the front and upper side of the seat. As a result, simultaneously with the deployment of the pair of front-rear extending portions 34A, the front connecting portion 34B and the airbag body 40 housed on the seat front side of the rear connecting portion 34D are pushed toward the front and upper side of the seat by the inflation pressure of the rear connecting portion 34D.

[0051] The pair of inflated and deployed front-rear extending portions 34A extend in the front-rear direction on both the left and right sides of the head H of the occupant D, and face the head H with a gap therebetween. Due to the movement of the pair of front-rear extending portions 34A, the front connecting portion 34B and the airbag body 40 pass through the gap between the head H of the occupant D and the ceiling 24 of the vehicle interior R from the rear side to the front side, and complete inflation and deployment in front of the seat of the occupant D.

[0052] The pair of front-rear extending portions 34A are pulled diagonally downward toward the rear by a pair of left and right rear tethers 54 described later, and thus assume a posture inclined downward toward the front. The front ends of the pair of inflated and deployed front-rear extending portions 34A are connected in the left-right direction by the inflated and deployed front connecting portion 34B. As shown in FIG. 3, the front-rear chamber 34 including the pair of front-rear extending portions 34A, the front connecting portion 34B, and the rear connecting portion 34D inflates and deploys in a loop shape in a plan view. In addition, a U-shaped portion opening rearward in a plan view formed by the pair of front-rear extending portions 34A and the front connecting portion 34B inflates and deploys toward the seat front side of the headrest 18.

[0053] More specifically, as shown in Figs. 1, 2, 4 and 5, an expanded portion 34B1 having a larger vertical dimension than both the left and right ends of the front connecting portion 34B is provided at the left-right center of the inflated and deployed front connecting portion 34B. This expanded portion 34B1 protrudes downward from both the left and right ends of the front connecting portion 34B. The aforementioned communication hole 48 is formed in this expanded portion 34B1. This communication hole 48 is located on the rear side of the left-right center of the inflated and deployed front connecting portion 34B. Gas from the inflator 44 is supplied rearward through the communication hole 48 into the airbag body 40. As a result, the airbag body 40 is inflated and deployed toward the occupant D (rearward) behind the front and rear chambers 34 behind the front connecting portion 34B. As the front and rear chambers 34 inflate and deploy, the airbag body 40 passes through the gap between the head H of the occupant D and the ceiling 24 of the vehicle interior R from the rear side to the front side, and then inflates and deploys toward the rear side.

[0054] The inflated and deployed airbag body 40 faces the head H, chest C, and abdomen B of the occupant D from the front side with a gap therebetween.

[0055] As shown in Figures 11 to 13, the inflated and deployed airbag body 40 restrains, from the front side, the occupant D who moves forward due to inertial force caused by the impact of a vehicle collision. When the occupant is restrained, the front and rear chambers 34 are expanded in the front-rear direction, and the airbag body 40 is compressed in the front-rear direction. As shown in Figures 12 to 13, the airbag body 40 is shaped so as to be sandwiched between the thighs F and chest C of the occupant D from the middle to late stages of restraint.

[0056] A pair of left and right rear tethers 54, a pair of left and right front upper tethers 56, and a pair of left and right front lower tethers 58 are attached to the airbag 32 configured as described above. The rear tethers 54, the front upper tethers 56, and the front lower tethers 58 are configured in the shape of long strips from, for example, a nylon-based or polyester-based cloth material. The cloth materials constituting the rear tethers 54, the front upper tethers 56, and the front lower tethers 58 are configured to be less stretchable than the base cloths 36, 38 constituting the front and rear chambers 34 and the base cloth 42 constituting the airbag body 40. This resistance to stretching can be adjusted by the material and thickness of the cloth.

[0057] One end of each of the pair of rear tethers 54 is engaged (sewn) to a longitudinal intermediate portion of each of the pair of front-rear extending portions 34A (specifically, to a front portion of each of the inflated and deployed front-rear extending portions 34A). The other end of each of the pair of rear tethers 54 is engaged to the seat back 16 or the vehicle body (not shown) on the rear side of the occupant D. When the airbag 32 is inflated and deployed, the pair of rear tethers 54 extend in the front-rear direction below the pair of front-rear extending portions 34A. In this state, the pair of rear tethers 54 are inclined so as to descend toward the rear. As a result, the pair of front-rear extending portions 34A are configured to be pulled diagonally downward toward the rear by the pair of rear tethers 54 (see arrow P1 in FIG. 14). As a result, when the airbag 32 is fully inflated and deployed, the airbag 32 is prevented from swinging in the up-down direction and the front-rear direction (see the airbag 32 shown by the two-dot chain line in FIG. 14).

[0058] As described above, the pair of front and rear extensions 34A are retracted, and thus, when the airbag 32 restrains the occupant, the lower surfaces of the pair of front and rear extensions 34A come into contact with the left and right shoulders K of the occupant D (see FIG. 15). When the airbag 32 restrains the occupant, the airbag body 40 is supported by the tensile load of the pair of front and rear extensions 34A and the pair of rear tethers 54 (see arrows P1 and P2 in FIG. 15). In this embodiment, the occupant D is AM50, but even when the occupant D is AM95 (the 95th percentile of American adult males) or AF05 (the 5th percentile of American adult females), the length of the pair of rear tethers 54 is set so that the lower surfaces of the pair of front and rear extensions 34A come into contact with the left and right shoulders K of the occupant D.

[0059] The pair of front upper tethers 56 connect the left and right sides of the front of the upper part of the airbag body 40 that inflates and deploys above the front and rear chambers 34 to the front of the pair of front and rear extending parts 34A. One end of each of the pair of front upper tethers 56 is sewn to the left and right sides of the front of the upper part of the airbag body 40 that inflates and deploys above the front and rear chambers 34. The other end of each of the pair of front upper tethers 56 is sewn to the front of the pair of front and rear extending parts 34A. The pair of front upper tethers 56 prevent the airbag body 40 from rotating upward around the front connecting part 34B (see the airbag body 40 shown by the two-dot chain line in FIG. 16) when the airbag 32 is fully inflated and deployed.

[0060] The pair of front lower tethers 58 connect the left and right portions of the lower part of the airbag body 40 that inflates and deploys downward from the front and rear chambers 34 to the front portions of the pair of front and rear extending portions 34A. One end of each of the pair of front lower tethers 58 is sewn to the left and right portions of the lower part of the airbag body 40 that inflates and deploys downward from the front and rear chambers 34. The other end of each of the pair of front lower tethers 58 is sewn to the front portions of the pair of front and rear extending portions 34A. The pair of front lower tethers 58 prevent the airbag body 40 from rotating downward about the front connecting portion 34B (see the airbag body 40 shown by the two-dot chain line in FIG. 17) when the airbag 32 has completed inflation and deployment.

[0061] 18, when one end of each of the pair of front upper tethers 56 is sewn to both left and right sides of the rear of the upper part of the airbag body 40 that inflates and deploys above the front and rear chambers 34, the following problem occurs. That is, as shown in FIG. 19, when the airbag 32 restrains an occupant, the pair of front upper tethers 56 are stretched, which hinders the compressive deformation of the airbag body 40. For this reason, it is necessary to sew one end of each of the pair of front upper tethers 56 to both left and right sides of the front of the upper part of the airbag body 40 that inflates and deploys above the front and rear chambers 34.

[0062] The airbag device 30 includes a control device (ECU) (not shown) that controls the operation of the pair of inflators 44. The control device is electrically connected to the pair of inflators 44 and a collision sensor (not shown). Based on information from the collision sensor, the control device is capable of detecting or predicting the occurrence of various types of frontal collisions (or the inevitability of a frontal collision) for the vehicle to which the control device is applied, for each of the collision types described below.

[0063] When the control device detects or predicts a frontal collision based on information from the collision sensors, it activates each inflator 44. The types of frontal collisions for which the control device activates the inflators 44 include offset frontal collisions such as a diagonal collision and a minute overlap collision, in addition to a full-wrap frontal collision.

[0064] (Action and Effects) Next, the operation and effects of the first embodiment will be described.

[0065] The passenger protection device 10 according to this embodiment includes a vehicle seat 12 on which an automobile passenger D sits, and an airbag device 30 for protecting the passenger D in the event of a vehicle collision. In this airbag device 30, gas generated from each inflator 44 is supplied to an airbag 32 in the event of a vehicle collision. As a result, the airbag 32 is inflated and deployed from the rear side of the upper portion of the vehicle seat to the front side of the seat, and is configured to pass between the ceiling 24 of the vehicle compartment R and the head H of the passenger D.

[0066] Here, the airbag 32 has at least one gas supply passage 60 provided toward the front side of the seat, and the gas supply passage 60 is set to have an acute angle of incidence θ1 with respect to the ceiling in a side view seen from the seat width direction. This allows the airbag 32 to be deployed in a direction that forms an acute angle with the ceiling 24 of the vehicle compartment R in a side view, thereby preventing the airbag 32 from getting caught on the ceiling 24. In addition, since the airbag 32 is deployed obliquely upward from the seat rear side of the headrest 18, interference with the head H of the occupant D above the headrest 18 is also prevented. This allows for improved deployment performance of the airbag 32 that inflates and deploys from the seat rear side of the upper part of the vehicle seat to the seat front side.

[0067] The incidence angle θ1 of the gas supply passage 60 with respect to the ceiling 24 of the vehicle interior R can be set to an acute angle in the range of 15° to 35°, and is more preferably set to 25°.

[0068] The airbag 32 of this embodiment has a front and rear chamber 34 and an airbag body 40. The front and rear chamber 34 passes through both the left and right sides of the head H of the occupant D seated in the vehicle seat, and the pair of left and right front and rear extending parts 34A inflate and deploy toward the front side of the seat. Then, the front connecting part 34B connecting the front ends of the pair of front and rear extending parts 34A in the seat width direction passes between the ceiling 24 of the vehicle interior R and the head H of the occupant D, and is disposed on the front side of the occupant D. Thereafter, the airbag body 40 is configured to inflate and deploy toward the occupant D side on the seat rear side of the front connecting part 34B after the front and rear chambers 34. As a result, when gas is supplied from the gas supply path 60, the pair of left and right front and rear extending parts 34A inflate in a direction that forms an acute angle with the ceiling, so that the front connecting part 34B and the airbag body 40 are prevented from getting caught on the ceiling 24 of the vehicle interior R. In addition, since the front connecting portion 34B and the airbag body 40 are deployed obliquely upward from the headrest 18, interference with the head H of the occupant D above the headrest 18 is also suppressed. Furthermore, when the occupant D is restrained, the airbag body 40 is compressed in the seat front-rear direction while expanding the front-rear chamber 34 in the seat front-rear direction. The airbag 32 can improve its energy absorption performance by the compressive deformation of the airbag body 40.

[0069] In this embodiment, the gas supply passage 60 includes a first gas supply passage 60A and a second gas supply passage 60B provided at the rear end of the pair of front-rear extending portions. The first gas supply passage 60A and the second gas supply passage 60B are inclined outward in the seat width direction so as to have a predetermined inclination angle θ2 with respect to the seat front-rear direction in a plan view. Therefore, when gas is supplied from the first gas supply passage 60A and the second gas supply passage 60B, the pair of front-rear extending portions 34A pass through both the left and right sides of the head H of the occupant D and inflate and deploy obliquely toward the front side of the seat and outward in the seat width direction. As a result, even if the position of the head H of the occupant D is biased in the seat width direction, for example, when the occupant D is sleeping leaning against the window, interference between the pair of front-rear extending portions 34A and the head H of the occupant D is suppressed on the side of the headrest 18.

[0070] In this embodiment, the inclination angle θ2 of the first gas supply path 60A and the second gas supply path 60B with respect to the seat front-rear direction can be set in the range of 10° to 45°, and is more preferably set to 15°.

[0071] In this embodiment, the front-rear chamber 34 has a rear connecting portion 34D that connects the rear ends of the pair of front-rear extending portions 34A in the seat width direction. This rear connecting portion 34D is accommodated on the seat rear side of the airbag body 40 before gas is supplied. Thereby, when gas is supplied from the gas supply passage 60, the rear connecting portion 34D inflates on the seat rear side of the airbag body 40, and the airbag body 40 can be pushed toward the seat front side. As a result, the robustness of the airbag body 40 during inflation and deployment is improved, and the behavior when passing through between the ceiling 24 of the vehicle interior R and the head H of the occupant D can be stabilized.

[0072] In this embodiment, the gas supply passage 60 includes a third gas supply passage 60C connected to the rear side surface of the rear connecting portion 34D. This allows the rear connecting portion 34D to be rapidly inflated and deployed toward the front side of the seat through the third gas supply passage 60C. This allows the airbag body 40 to be pushed out in a direction that forms an acute angle with the ceiling 24 of the vehicle compartment R in the early stage of inflation and deployment, and the behavior of the airbag body 40 when passing through between the ceiling 24 of the vehicle compartment R and the head H of the occupant D can be further stabilized.

[0073] In this embodiment, after the front and rear chambers 34 are inflated and deployed, the airbag body 40 is inflated and deployed toward the occupant D (i.e., rearward) on the rear side of the front connecting portion 34B. This reduces the gap between the airbag body 40 and the occupant D. As a result, the occupant D is restrained by the airbag body 40 early, and the initial restraint performance of the airbag body 40 for the occupant D can be improved.

[0074] In this embodiment, the airbag body 40 is supplied with gas from the inflator 44 through a communication hole 48 located on the rear side of the left-right center of the front connecting portion 34B of the front-rear chamber 34 when the front-rear chamber 34 is in an inflated and deployed state. That is, the gas that has passed through the pair of front-rear extending portions 34A and the front connecting portion 34B of the front-rear chamber 34 is supplied rearward from the communication hole 48 into the airbag body 40. This allows the airbag body 40 to be inflated and deployed with a sufficient delay relative to the front-rear chamber 34. As a result, it becomes easy to inflate and deploy the airbag 32 by passing through a narrow gap between the head H of the occupant D and the ceiling 24 of the vehicle interior R, for example.

[0075] That is, in this embodiment, the airbag body 40 passes through the gap between the head H of the occupant D and the ceiling 24 of the vehicle interior R from the rear side to the front side due to the inflation and deployment of the front and rear chambers 34, and then inflates and deploys toward the rear side. This makes it easier to prevent the airbag body 40 from getting stuck in the gap, making it easier to prevent poor deployment of the airbag.

[0076] In this embodiment, the base fabrics 36, 38 constituting the front and rear chambers 34 include a base fabric less stretchable than the base fabric 42 constituting the airbag body 40. Specifically, the front and rear chambers 34 are configured by overlapping two base fabrics 36, 38 and sewing the peripheral portions, and one or both of the two base fabrics 36, 38 are the above-mentioned base fabric less stretchable. As shown in FIG. 20, a base fabric 37 less stretchable than the base fabric of the airbag body 40 may be disposed between the two base fabrics 36, 38. In the configuration shown in FIG. 20, the two base fabrics 36, 38 are considered to be as difficult to stretch as the base fabric 42 constituting the airbag body 40.

[0077] By configuring the front and rear chambers 34 as described above, the amount of energy absorption due to the expansion of the front and rear chambers 34 in the front-rear direction can be improved, as shown by the solid line graph in FIG. 21. In FIG. 21, the vertical axis f indicates the load applied from the airbag body 40 to the chest C of the occupant D, and the horizontal axis S indicates the displacement of the chest C of the occupant D. In FIG. 21, the graph shows a case in which the base fabric constituting the front and rear chambers 34 is as difficult to stretch as the base fabric constituting the airbag body 40. By configuring as in this embodiment, the amount of energy absorption is particularly improved in the section from (2) to (3) in FIG. 21. In addition, when the front and rear chambers 34 are configured without the base fabric 37, the number of base fabrics and the volume of the airbag 32 in the folded state can be reduced compared to the configuration shown in FIG. 20. In this embodiment, since the front and rear chambers 34 and the airbag body 40 are manufactured from different base fabrics, it is possible to change the difficulty of stretching the base fabric of the front and rear chambers 34 to the difficulty of stretching the base fabric of the airbag body 40.

[0078] In this embodiment, the airbag body 40 is shaped so as to be sandwiched between the thighs F and chest C of the occupant D from the middle to the later stage of restraining the occupant by the airbag 32. This allows a wide area of ​​the upper body of the occupant D to come into contact with the airbag body 40, thereby effectively reducing the load applied to the occupant D from the airbag body 40.

[0079] According to this embodiment, when the airbag 32 restrains the occupant D, a pair of rear tethers 54, one end of which is sewn to the pair of front and rear extending portions 34A of the front and rear chambers 34 and the other end of which is anchored to the seat back 16 or the vehicle body on the seat rear side of the occupant D, pull the pair of front and rear extending portions 34A diagonally downward toward the rear of the seat. The pair of rear tethers 54 are stretched in the front-rear direction together with the front and rear chambers 34 when the airbag body 40 restrains the occupant D. Together with the front and rear chambers 34, these rear tethers 54 receive and support the load applied to the airbag body 40 by the occupant D.

[0080] Moreover, the above-mentioned retraction by the pair of rear tethers 54 can suppress the vertical and front-rear swinging of the airbag 32 when inflation and deployment is completed. Furthermore, the above-mentioned retraction by the pair of rear tethers 54 causes the lower surfaces of the pair of front-rear extending portions 34A to abut against the left and right shoulders K of the occupant D. This makes it possible to stabilize the vertical position of the airbag main body 40 with respect to the head H of the occupant D regardless of the physique of the occupant D.

[0081] In this embodiment, the front portion of the upper portion of the airbag body 40 that inflates and deploys upward from the front and rear chambers 34 and the pair of front and rear extending portions 34A of the front and rear chambers 34 are connected by a pair of front upper tethers 56. This makes it possible to prevent the inflated and deployed airbag body 40 from being accidentally displaced (rotated) upward about the front connecting portions 34B relative to the front and rear chambers.

[0082] Furthermore, in this embodiment, the lower portion of the airbag body 40 that inflates and deploys downward from the front and rear chambers 34 and the pair of front and rear extending portions 34A of the front and rear chambers 34 are connected by a pair of front lower tethers 58. This makes it possible to prevent the inflated and deployed airbag body 40 from being accidentally displaced (rotated) downward about the front connecting portion 34B relative to the front and rear chambers 34.

[0083] (About modified examples) Although one embodiment of the present invention has been described above, the present invention can be practiced with various modifications without departing from the spirit and scope of the present invention. It goes without saying that the scope of the present invention is not limited to the above embodiment.

[0084] For example, in the above embodiment, the airbag device 30 is configured to include three inflators 44, but the number of inflators 44 can be changed as appropriate. For example, an airbag device 80 shown in Fig. 22 may be configured to include one inflator 44.

[0085] In the airbag device 80, the airbag 32 is inflated and deployed by receiving gas from one inflator 44 via a diffuser 82 communicating with the inside of the front and rear chambers 34. The configuration of the airbag 32 is similar to that of the above embodiment, and therefore detailed description thereof will be omitted.

[0086] The diffuser 82 is manufactured from a metal pipe and has a straight section toward the front and rear chamber 34. Specifically, the diffuser 82 is connected to the rear ends of the pair of front and rear extending portions 34A of the front and rear chamber 34 and has a first tubular portion 84 and a second tubular portion 86 that form the straight section. The diffuser 82 also has a third tubular portion 88 that is connected to the longitudinal center of the rear connecting portion 34D of the front and rear chamber 34 and forms the straight section.

[0087] The first tubular portion 84, the second tubular portion 86, and the third tubular portion 88 form a linear gas supply path 60. The first tubular portion 84 forms a first gas supply path 60A similar to the above embodiment. The second tubular portion 86 forms a second gas supply path 60B similar to the above embodiment. The third tubular portion 88 forms a third gas supply path 60C similar to the above embodiment.

[0088] The first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60 have the same configurations as those in the above embodiment, and therefore detailed description thereof will be omitted.

[0089] The diffuser 82 also has a fourth tubular portion 90 that connects the ends of the first tubular portion 84, the second tubular portion 86, and the third tubular portion 88 on the seat rear side. The fourth tubular portion 90 has a lower end portion extending in the seat up-down direction, and a gas outlet of the inflator 44 is fixed to the lower end portion. Therefore, when gas is discharged from the inflator 44, the gas is supplied to the first tubular portion 84, the second tubular portion 86, and the third tubular portion 88 through the fourth tubular portion 90 of the diffuser 82. Then, gas is supplied from the first tubular portion 84 and the second tubular portion 86 into the pair of front-rear extending portions 34A of the front-rear chamber 34. Also, gas is supplied from the third tubular portion 88 into the rear connecting portion 34D of the front-rear chamber 34.

[0090] The inflator 44 is disposed with its axis aligned along the vertical direction of the seat back 16. Each inflator 44 is provided with, for example, a pair of upper and lower stud bolts. The pair of stud bolts penetrate the diffuser 82, the module case 46, and a frame (not shown) of the seat back 16, and a nut is screwed onto each stud bolt. In this way, the diffuser 82, the inflator 44, and the module case 46 are fixed to the frame of the seat back 16.

[0091] In the airbag device 80 having such a configuration, the airbag 32 can be inflated and deployed in the same manner as in the above embodiment, and therefore the same functions and effects can be obtained.

[0092] Furthermore, in the airbag device 80, the airbag 32 can be inflated and deployed by receiving gas from a single inflator 44, so the number of inflators required can be reduced compared to the above embodiment, thereby enabling reduction in manufacturing costs.

[0093] Furthermore, in the airbag device 80, the axial direction of the inflator 44 is arranged in the vertical direction of the seat back 16, so that the module case 46 can be made thinner in the fore-and-aft direction of the seat, thereby enabling the airbag device 80 to be made more compact.

[0094] In the above embodiment, the gas is simultaneously supplied to the first gas supply passage 60A, the second gas supply passage 60B, and the third gas supply passage 60, but the present invention is not limited to this. For example, from the viewpoint of pushing the airbag body 40 toward the seat front side immediately after the airbag 32 starts to inflate and deploy, the gas may be supplied to the first gas supply passage 60A and the second gas supply passage 60B later than the third gas supply passage 60.

[0095] In the above embodiment, the first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60C are provided as the gas supply path 60, but the present invention is not limited to this. For example, the third gas supply path 60C may be omitted. In this case, the airbag 32 may be configured to omit the rear connecting portion 34D. [Explanation of symbols]

[0096] 12 Vehicle seats 24 Ceiling 30 Airbag device 32 Airbag 34 Front and rear chambers 34A Front and rear extension part 34B Front connection part 34D rear connection section 40 Airbag body 44 Inflator 60 Gas supply line 60A First gas supply line (gas supply line) 60B Second gas supply path (gas supply path) 60C Third gas supply line (gas supply line) 70 Diffuser (gas supply path) 80 Airbag device D. Crew H head R cabin

Claims

1. an inflator that generates gas when the vehicle crashes; an airbag that is supplied with the gas, inflates and deploys from a rear side of an upper portion of the vehicle seat to a front side of the seat, and passes between a ceiling of a vehicle compartment and the head of an occupant seated in the vehicle seat; The airbag has at least one gas supply passage that is provided toward a front side of the seat and has an acute angle of incidence with respect to the ceiling in a side view seen from a seat width direction. Airbag device.

2. The incident angle is set to 15° to 35°.

2. The airbag device according to claim 1.

3. The airbag is a front and rear chamber including a pair of front and rear extending portions that inflate and deploy toward a front side of the seat through both left and right sides of the head of an occupant seated in the vehicle seat, and a front connecting portion that connects front ends of the pair of front and rear extending portions in a seat width direction; an airbag body that inflates and deploys toward the occupant on the seat rear side of the front connecting portion after the front and rear chambers, and that is compressed in the seat front and rear direction while expanding the front and rear chambers in the seat front and rear direction when the occupant is restrained.

3. The airbag device according to claim 1 or 2.

4. The gas supply path is a first gas supply passage and a second gas supply passage provided at rear ends of the pair of front and rear extending portions, the first gas supply passage and the second gas supply passage are inclined outward in the sheet width direction so as to have a predetermined inclination angle with respect to the sheet front-rear direction in a plan view; 4. The airbag device according to claim 3.

5. The inclination angle is set to 10° to 45°.

5. The airbag device according to claim 4.

6. The front and rear chambers are a rear connecting portion that is accommodated in the airbag body on the seat rear side before the gas is supplied and that connects rear ends of the pair of front and rear extending portions in the seat width direction; 4. The airbag device according to claim 3.

7. The gas supply path is A third gas supply passage connected to a rear side surface of the rear connection portion, 7. The airbag device according to claim 6.

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