Airbag device

Abstract

An airbag device is provided with: an inflator that generates gas when a vehicle collides; and an airbag which is supplied with the gas, expands and deploys from the rear side of the seat to the front side of the seat above the seat for the vehicle, passes between the ceiling of the vehicle cabin and the head of an occupant seated on the seat for the vehicle, and has at least one gas supply path through which the gas is supplied. The gas supply path is provided toward the front side of the seat, and an angle of incidence with respect to the ceiling is set to an acute angle in a side view from a seat width direction.

Description

Technical Field

[0001] The present disclosure relates to an airbag device. Background Art

[0002] The airbag device disclosed in Japanese Patent Application Laid-Open No. 2019-218013 includes an inflator and an airbag that is deployed by gas supplied from the inflator. The airbag includes a rear inflation portion that is deployed on the back side of the seat, a pair of side inflation portions that extend forward from both sides of the rear inflation portion in the seat width direction, and a pair of front inflation portions that extend toward the center from the pair of side inflation portions and are connected to each other at the center to cover the front of the occupant. In this airbag, when gas supply starts, it is deployed toward the front side of the seat in a manner that passes over the headrest.

[0003] In the airbag device disclosed in Japanese Patent Application Publication No. 2019-218013, the inflator and the airbag are stored in a storage portion in the seat back. When gas starts to be supplied from the inflator, the airbag tears the surface of the seat back and enters the rear side of the seat, and begins to deploy upward and behind the seat. Therefore, it is necessary to consider the possibility that the airbag is caught by the ceiling of the vehicle compartment at the initial stage of inflation and deployment.

[0004] In addition, the position of the head of an occupant sitting on a vehicle seat may vary in the vertical direction of the seat depending on the physique of the occupant and the situation during a vehicle collision. Therefore, when the airbag is deployed to the front side of the seat in a manner that passes over the headrest, it may be caught by the occupant's head. Therefore, from the perspective of improving the deployment performance of the airbag, there is still room for improvement. Summary of the invention

[0005] The present disclosure takes the above-mentioned circumstances into consideration, and an object thereof is to obtain an airbag device that can improve the deployment performance of an airbag that is inflated and deployed from the seat rear side to the seat front side of an upper portion of a vehicle seat.

[0006] The first type of airbag device comprises: an inflation device that generates gas when a vehicle collides; an airbag that is supplied with the gas and expands and deploys from the rear side of the seat to the front side of the seat on the upper part of the vehicle seat, and passes between the ceiling of the vehicle compartment and the head of the occupant sitting on the vehicle seat, the airbag having at least one gas supply path, the gas supply path being arranged toward the front side of the seat, and the incident angle relative to the ceiling being set to an acute angle when viewed from the side in the seat width direction.

[0007] In the first embodiment of the airbag device, the gas generated from the inflator is supplied to the airbag when the vehicle collides. Thus, the airbag is configured to expand and deploy from the rear side of the seat of the upper part of the vehicle seat to the front side of the seat, and pass between the ceiling of the vehicle and the head of the occupant sitting on the vehicle seat. Here, the airbag has at least one gas supply path arranged toward the front side of the seat, and the incident angle of the gas supply path relative to the ceiling when viewed from the side in the direction of the width of the seat is set to an acute angle. Thus, the airbag can be deployed in a direction that is an acute angle relative to the ceiling when viewed from the side, thereby suppressing the situation where the airbag is stuck at the ceiling of the vehicle. In addition, since the airbag is deployed from the upper part of the vehicle seat to the oblique upper side, interference with the head of the occupant at the upper side of the vehicle seat is also suppressed. Thus, the deployment performance of the airbag that expands and deploys from the rear side of the seat of the upper part of the vehicle seat to the front side of the seat can be improved.

[0008] The airbag device according to a second aspect is the airbag device according to the first aspect, wherein the incident angle is set to 15° to 35°.

[0009] In the second type of airbag device, since the incident angle of the gas supply path relative to the ceiling of the vehicle cabin is set to an acute angle in the range of 15° to 35°, 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.

[0010] The third embodiment of the airbag device is that in the first embodiment or the second embodiment, the airbag comprises: a front and rear chamber, which has a pair of front and rear extensions and a front connecting portion, the pair of front and rear extensions pass through the left and right sides of the head of an occupant sitting on the vehicle seat and expand and deploy toward the front side of the seat, and the front connecting portion connects the front end portions of the pair of front and rear extensions in the seat width direction; an airbag body, which expands and deploys toward the occupant side at a delay from the front and rear chambers at the rear side of the seat of the front connecting portion, and when restraining the occupant, the front and rear chambers are stretched in the seat front and rear direction and the airbag body is compressed in the seat front and rear direction.

[0011] In the third embodiment of the airbag device, the airbag has a front and rear chamber and an airbag body. The front and rear chambers pass through the left and right sides of the head of the occupant sitting on the vehicle seat, and the left and right front and rear extensions expand and unfold toward the front side of the seat. In addition, the front connecting portion connecting the front ends of the pair of front and rear extensions in the seat width direction passes between the ceiling of the vehicle and the head of the occupant, and is arranged at the front side of the occupant. Then, the airbag body is configured to expand and unfold toward the occupant side at the rear side of the seat of the front connecting portion delayed from the front and rear chambers. As a result, when the airbag is supplied with gas from the gas supply path, the left and right front and rear extensions expand in a direction that is an acute angle relative to the ceiling, thereby preventing the front connecting portion and the airbag body from being stuck at the ceiling of the vehicle. In addition, since the front connecting portion and the airbag body expand from the upper part of the vehicle seat to the oblique upper side, interference with the occupant's head at the upper side of the vehicle seat is also suppressed.

[0012] Furthermore, the airbag body expands the front and rear chambers in the seat front and rear direction when the occupant is restrained and the airbag body is compressed in the seat front and rear direction. The airbag can improve energy absorption performance by compressive deformation of the airbag body.

[0013] The fourth embodiment of the airbag device is that in the third embodiment, the gas supply path includes a first gas supply path and a second gas supply path which are arranged at the rear end portions of the pair of front and rear extension portions, and the first gas supply path and the second gas supply path are inclined toward the outside in the seat width direction in a manner having a predetermined inclination angle relative to the front and rear direction of the seat when viewed from above.

[0014] In the fourth embodiment of the airbag device, as gas supply paths, a first gas supply path and a second gas supply path are provided at the rear end of a pair of front and rear extensions. The first gas supply path and the second gas supply path are inclined outward in the seat width direction at a predetermined inclination angle relative to the front and rear direction of the seat when viewed from above. Therefore, when the airbag is supplied with gas from the first gas supply path and the second gas supply path, the pair of front and rear extensions inflate and deploy obliquely toward the front side of the seat and outward in the seat width direction through the left and right sides of the occupant's head. Thus, even if the position of the occupant's head is offset in the seat width direction, interference between the pair of front and rear extensions and the occupant's head at the side of the vehicle seat is suppressed.

[0015] The fifth embodiment of the airbag device is that in the fourth embodiment, the first gas supply path and the second gas supply path are set at an inclination angle of 10° to 45° relative to the front-rear direction of the seat. This can suppress interference with the head of the occupant at the side of the vehicle seat and improve the deployment performance of the airbag that expands and deploys from the rear side of the seat to the front side of the seat at the upper part of the vehicle seat.

[0016] The sixth mode of the airbag device is that in any one of the third to fifth modes, the front and rear chambers also have a rear connecting portion, which is accommodated on the seat rear side of the airbag body before the gas is supplied, and connects the rear end portions of the pair of front and rear extension portions in the seat width direction.

[0017] In the sixth embodiment of the airbag device, the front and rear chambers have a rear connection portion that connects the rear ends of a pair of front and rear extensions in the seat width direction. The rear connection portion is stored at the seat rear side of the airbag body before gas is supplied. Thus, when gas is supplied from the gas supply path, the rear connection portion expands at the seat rear side of the airbag body, thereby being able to push the airbag body toward the seat front side. As a result, the robustness of the airbag body during expansion and deployment can be improved, and the movement when passing between the ceiling of the vehicle and the head of the occupant can be stabilized.

[0018] The airbag device according to a seventh aspect is, in the sixth aspect, wherein the gas supply path is configured to include a third gas supply path connected to a rear side surface of the rear connecting portion.

[0019] In the seventh embodiment of the airbag device, a third gas supply path connected to the rear side surface of the rear connecting portion is included as a gas supply path. Thus, the rear connecting portion can be rapidly expanded and deployed toward the front side of the seat through the third gas supply path. Thus, at the initial stage of expansion and deployment, the airbag body is pushed out in a direction forming an acute angle with respect to the ceiling of the vehicle compartment, so that the movement of the airbag body when passing between the ceiling of the vehicle compartment and the head of the occupant can be made more stable.

[0020] Effects of the Invention

[0021] As described above, in the airbag device according to the present disclosure, it is possible to improve the deployment performance of the airbag that is inflated and deployed from the seat rear side to the seat front side of the upper portion of the vehicle seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Exemplary embodiments of the present disclosure will be described in detail according to the following figures, wherein:

[0023] Figure 1is a perspective view showing a state in which an airbag is inflated and deployed in the airbag device according to the present embodiment;

[0024] Figure 2 For the general Figure 1 The structure shown is a side view as viewed from the left side of the vehicle;

[0025] Figure 3 For the general Figure 1 The structure shown is a top view as viewed from above the vehicle;

[0026] Figure 4 For the general Figure 1 The structure shown is a front view as viewed from the front of the vehicle;

[0027] Figure 5 For Figure 4 A front view showing a perspective view of the airbag;

[0028] Figure 6 A development view of a portion corresponding to a pair of front and rear extensions and a front connecting portion of a front and rear chamber provided with an airbag;

[0029] Figure 7 An expanded view of an airbag body provided for the airbag;

[0030] Figure 8 A development view of a portion corresponding to a rear connection portion of front and rear chambers provided in the airbag;

[0031] Fig. 9 A side view showing an initial state of the airbag inflating and deploying;

[0032] Fig.10 A side view showing a state immediately after the airbag has been inflated and deployed;

[0033] Fig.11 A side view showing an initial state of occupant restraint by an airbag;

[0034] Fig.12 A side view showing a state of an intermediate stage of occupant restraint achieved by an airbag;

[0035] Fig.13 A side view showing a state in which the occupant is restrained in a later stage by the airbag;

[0036] Fig.14 A side view for explaining the swing suppression effect of the air bag achieved by the rear tether;

[0037] Fig.15is a side view for explaining the abutment of the front and rear chambers against the shoulders of the occupant;

[0038] Fig.16 A side view for explaining the swing suppression effect of the air bag achieved by the front upper tether;

[0039] Fig.17 A side view for explaining the swing suppression effect of the air bag achieved by the front lower tether;

[0040] Fig.18 is a side view showing an example in which the installation position of the front upper tether is not appropriate, and is a view showing a state immediately before the occupant is restrained by the airbag;

[0041] Fig.19 is a side view showing an example in which the installation position of the front upper tether is not appropriate, and is a diagram showing a state in a later stage of occupant restraint achieved by the airbag;

[0042] Fig. 20 A cross-sectional view showing an example in which a part of the plurality of base fabrics constituting the front and rear chambers is a base fabric that is difficult to stretch;

[0043] Fig.21 is a line graph showing the relationship between the load acting on the chest of the occupant and the displacement of the chest;

[0044] Fig. 22 This is a side view of a main part showing, in a partially enlarged manner, a state in which an airbag is inflated and deployed in an airbag device according to a modification. DETAILED DESCRIPTION

[0045] <First embodiment>

[0046] Below, refer to Figures 1 to 21 The occupant protection device 10 involved in the first embodiment of the present disclosure and the airbag device 30 installed in the occupant protection device 10 are described. In addition, in each figure, in order to facilitate observation of the drawings, there is a case where some symbols are omitted. In addition, the arrow mark FR, arrow mark UP, arrow mark LH and arrow mark RH appropriately described in each figure respectively represent the front (travel direction), top, left and right of the vehicle. In the following, when only the front and back, left and right, and up and down directions are used for description, unless otherwise specified, it is assumed to represent the front and back of the vehicle's front and back direction, the left and right of the vehicle's left and right direction, and the up and down of the vehicle's up and down direction.

[0047] like Figures 1 to 5As shown, the occupant 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 (car). The vehicle seat 12 has a seat cushion 14, a seat back 16 erected on the upper side of 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, up, and down directions of the vehicle seat 12 are consistent with the front, rear, left, right, up, and down directions of the vehicle.

[0048] In addition, Figures 1 to 5 In the figure, as a model of the occupant (sitter) to be protected, a collision test dummy D is shown sitting on the seat cushion 14 of the vehicle seat 12. The dummy D is, for example, an AM50 (50th percentile of American adult males) of a frontal collision test dummy (Hybrid III). The dummy D sits in a standard sitting posture prescribed by the collision test law, and the vehicle seat 12 is located at a reference setting position corresponding to the sitting posture. In the following, for easy understanding of the description, the dummy D is referred to as "occupant D".

[0049] The occupant D sitting on the seat cushion 14 of the vehicle seat 12 is secured by a seat belt 22 (see Figures 1 to 3 ;exist Figure 4 as well as Figure 5 The seat belt device 20 is a three-point seat belt device, and is a so-called seat belt device attached to the seat, in which a retractor, an anchor, and a buckle (symbols omitted) not shown are all provided on the vehicle seat 12.

[0050] The airbag device 30 includes an airbag 32 and a plurality of inflators 44 (see Figures 2 to 3 ), and module housing 46 (in Figures 10 to 20 The airbag 32 is normally stored in a folded state together with a plurality of inflators 44 in a module housing 46. The module housing 46 is formed in a hollow rectangular parallelepiped shape. The module housing 46 is arranged at the rear of the upper portion of the vehicle seat 12 (specifically, at the upper end of the seat back 16 and the rear of the headrest 18), and is fixed to the upper end of the seat back 16 or the vehicle body (not shown).

[0051] The airbag 32 receives gas supply from a pair of inflators 44 and expands and deploys (expands and expands) from the rear side of the upper part of the vehicle seat 12 to the front side. The airbag 32 includes a front and rear chamber 34 and an airbag body 40. The front and rear chamber 34 includes a pair of left and right front and rear extensions 34A that penetrate the left and right sides of the head H of the occupant D and expand and deploy to the front side, and a front connecting portion 34B that connects the front ends of the pair of front and rear extensions 34A in the left and right direction. In addition, the front and rear chamber 34 includes a rear connecting portion 34D that connects the rear ends of the pair of front and rear extensions 34A in the left and right direction. The airbag body 40 expands and deploys to the occupant D side (rear side) at the rear side of the front connecting portion 34B with a delay from the front and rear chamber 34.

[0052] The front and rear chambers 34 are connected by Figure 6 The two long base fabrics 36 and 38 are overlapped and the peripheral edges are sewn together at the sewing portion S1 to form a long bag shape. Figure 7 The base fabric 42 shown is folded along four fold lines L1, L2, L3, and L4, and sewn together at a sewing portion S2, thereby forming a bag shape. In the sewing portion S2, sewing lines SL21 and SL22 are sewn together, sewing lines SL23 and SL24 are sewn together, sewing lines SL25 and SL26 are sewn together, and sewing lines SL27 and SL28 are sewn together. The above-mentioned base fabrics 36, 38, and 42 are made of, for example, nylon or polyamide fabrics. One or both of the two base fabrics 36 and 38 constituting the front and rear chambers 34 are made of a base fabric that is more difficult to stretch than the base fabric 42 constituting the airbag body 40.

[0053] The two ends of the front and rear chambers 34 in the longitudinal direction are set as a pair of left and right inflator storage parts 34C for storing a pair of inflators 44. A gas supply path 60 for supplying gas from the inflator 44 to the front and rear chambers 34 is formed inside the pair of inflator storage parts 34C. The gas supply path 60 is formed by arranging a tubular diffuser 70 inside the inflator storage part 34C. The diffuser 70 is made of, for example, a metal pipe and has a straight area facing the front and rear chambers 34. The gas ejection port (symbol omitted) of the inflator 44 is fixed to the ends of the diffuser 70 in the longitudinal direction, thereby forming a linear gas supply path 60.

[0054] The central part of the longitudinal direction of the front and rear chambers 34 is set as the front connecting part 34B, and the front and rear extension parts 34A are respectively set between the front connecting part 34B and the pair of inflator storage parts 34C. The pair of inflators 44 are cylinder-type inflators of combustion type or low-temperature gas type, and generate gas by operation. The operation of these inflators 44 is controlled by a control device not shown in the figure, and gas is generated when the vehicle collides.

[0055] Here, a pair of inflator storage portions 34C are separately arranged at the left and right sides in the module housing 46. In addition, the gas supply path 60 provided in each inflator storage portion 34C is provided toward the front side of the seat. In addition, the gas supply path 60 extends obliquely toward the front side of the seat and the upper side of the seat when stored in the module housing 46. In particular, in the present embodiment, the incident angle θ1 of the gas supply path 60 relative to the ceiling 24 of the vehicle compartment R when viewed from the side in the seat width direction is set to an acute angle.

[0056] 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°.

[0057] Hereinafter, as needed, the gas supply path 60 provided at the rear end portion of the front-rear extension portion 34A at one end side of the long side direction of the front-rear chamber 34 will be referred to as the first gas supply path 60A, and the gas supply path 60 provided at the rear end portion of the front-rear extension portion 34A at the other end side of the long side direction of the front-rear chamber 34 will be referred to as the second gas supply path 60B.

[0058] In addition, if Figure 3 As shown, the first gas supply path 60A and the second gas supply path 60B are inclined outward in the seat width direction at a predetermined inclination angle θ2 with respect to the seat front-rear direction in a plan view.

[0059] 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°.

[0060] The inflator 44 is arranged toward the front side of the seat by partially or entirely inserting it into the gas supply path 60, and is arranged in a posture in which the axial direction is inclined toward the upper side of the seat relative to the seat front-rear direction. That is, each inflator 44 is arranged in a posture in which the incident angle θ1 with respect to the ceiling 24 of the vehicle compartment R when viewed from the side in the seat width direction is set to the same acute angle as the gas supply path 60.

[0061] Stud bolts are provided in pairs at the two ends of each inflator 44, for example, in the axial direction. The pair of stud bolts penetrates the inflator storage portion 34C, the module housing 46, and a bracket (not shown) supported by the frame of the seat back 16, and a nut is threadedly engaged with each stud bolt. Thus, the inflator storage portion 34C, the inflator 44, and the module housing 46 are fixed to the frame of the seat back 16.

[0062] The pair of front and rear extensions 34A are each formed into a long tube shape. The front connecting portion 34B is in a substantially T-shaped bag shape connected to each of the front and rear extensions 34A. The front connecting portion 34B is provided at a sewn portion S3 (see Figure 6 as well as Figure 7 ) is sewn together with the airbag body 40. The sewn portion S3 is, as an example, in a substantially inverted trapezoidal shape. A connecting hole 48 is formed on the inner side of the sewn portion S3 to connect the inside of the front connecting portion 34B with the inside of the airbag body 40. The connecting hole 48 is, as an example, in a substantially inverted trapezoidal shape. The connecting hole 48 is composed of a through hole 50 formed on the base fabric 36 of the front and rear chambers 34 and a through hole 52 formed on the base fabric 42 of the airbag body 40.

[0063] like Figure 8 As shown, the rear connecting portion 34D is formed into a long tube shape by overlapping two long base fabrics 64 and 65 and sewing the ends in the width direction together at the sewing portion S5. The rear connecting portion 34D is sewn together with the rear ends of the pair of front and rear extension portions 34A at the sewing portions S4 provided at the two ends in the long side direction of the rear connecting portion 34D. Figure 6 As shown, a connecting hole 66 is formed on the inner side of the sewn portion S4 to connect the rear connecting portion 34D with the front and rear extending portions 34A. The connecting hole 66 is generally circular in shape as an example. The connecting hole 66 is formed by a through hole 53 formed on the base fabric 36 of the front and rear chambers 34.

[0064] In addition, a tubular diffuser 70 is connected to the rear connecting portion 34D at the center in the long-side direction. As an example, the diffuser 70 is made of a metal tube and has a straight area facing the rear connecting portion 34D. In the diffuser 70, one end of the diffuser 70 in the long-side direction is connected to a connecting hole 67 formed in the center of the long-side direction of the rear connecting portion 34D. The inside of the diffuser 70 is connected to the inside of the rear connecting portion 34D through the connecting hole 67. The connecting hole 67 is, as an example, substantially circular. The connecting hole 67 is composed of a through hole 68 formed on the base fabric 65 constituting the rear side surface at the rear connecting portion 34D.

[0065] The diffuser 70 having the above structure is arranged at the center of the seat width direction in the module case 46, and a pair of inflator storage portions 34C are arranged on both left and right sides of the diffuser 70. The diffuser 70 forms a gas supply path 60 connected to the rear side surface of the rear connecting portion 34D.

[0066] Hereinafter, the gas supply path 60 formed by the diffuser 70 is referred to as the third gas supply path 60C as needed. The third gas supply path 60 constitutes a linear flow path and is provided toward the front side of the seat in the same manner as the first gas supply path 60A and the second gas supply path 60B described above. In addition, the third gas supply path 60C extends obliquely toward the front side of the seat and above the seat when stored in the module housing 46. In addition, the incident angle θ1 of the third gas supply path 60C relative to the ceiling 24 of the vehicle compartment R when viewed from the side in the seat width direction is set to an acute angle.

[0067] In addition, in the present embodiment, the third gas supply path 60C is arranged above the seat compared to the first gas supply path 60A and the second gas supply path 60B when accommodated in the module case 46. A gas ejection portion (symbol omitted) of the inflator 44 is fixed to the other end portion in the longitudinal direction of the diffuser 70 constituting the third gas supply path 60C.

[0068] The inflator 44 is arranged toward the front side of the seat by inserting a part or all of it into the third gas supply path 60C, and is arranged in a posture that the axial direction is inclined toward the upper side of the seat relative to the front-rear direction of the seat. That is, the inflator 44 is arranged in a posture that the incident angle θ1 relative to the ceiling 24 of the vehicle R when viewed from the side in the seat width direction is set to the same acute angle as the third gas supply path 60C. The inflator 44 is provided with studs in a paired state at both ends in the axial direction, for example. A pair of studs penetrates the diffuser 70, the module housing 46, and a bracket not shown in the figure supported by the frame of the seat back 16, and a nut is threadedly coupled to each stud. As a result, the diffuser 70, the inflator 44, and the module housing 46 are fixed to the frame of the seat back 16.

[0069] The pair of front and rear extensions 34A, the front connection portion 34B, the rear connection portion 34D, and the airbag body 40 are normally folded in a predetermined folding manner such as roll folding or accordion folding and stored in the module case 46. In addition, the rear connection portion 34D is stored on the seat rear side of the airbag body 40 (see FIG. 1 ) in a state in which it is stored in the module case 46, that is, before gas is supplied from the inflator 44. Fig. 9). In addition, the diffuser 70 constituting the third gas supply path 60C is housed on the seat rear side of the airbag body 40 via the rear connecting portion 34D.

[0070] When the plurality of inflators 44 (three in the present embodiment) are operated, 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 toward the front connecting portion 34B through the pair of inflator storage portions 34C and the pair of front-rear extension portions 34A, and is supplied to the airbag body 40 through the communication hole 48. Thus, the airbag 32 is inflated and deployed in the order of the pair of front-rear extension portions 34A, the front connecting portion 34B, and the airbag body 40.

[0071] On the other hand, the gas generated in the third gas supply path 60C passes through the communication hole 67 to expand the rear connecting portion 34D, then passes through the pair of front and rear extensions 34A to flow toward the front connecting portion 34B, and passes through the communication hole 48 to be supplied into the airbag body 40. Thus, the gas supplied from the third gas supply path 60C is supplied into the airbag 32 in the order of the rear connecting portion 34D, the pair of front and rear extensions 34A, the front connecting portion 34B, and the airbag body 40, thereby assisting the inflation and deployment of the airbag 32.

[0072] When the airbag 32 is inflated and deployed, a tear line (not shown) formed in the module case 46 is configured to be ruptured by the inflation pressure of the airbag 32. Thus, the airbag 32 can be inflated and deployed to the outside of the module case 46.

[0073] Here, if Fig. 9 As shown, a guide portion 46A is integrally provided on the upper portion of the module housing 46, and the guide portion 46A extends toward the front side and the upper side of the seat, compared to the first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60C of the airbag 32. The guide portion 46A is formed with a guide surface whose incident angle θ1 with respect to the ceiling 24 of the vehicle compartment R is set to an acute angle when viewed from the side in the seat width direction, and guides the deployment direction toward the front side and the upper side of the seat when the airbag 32 is inflated and deployed toward the outside of the module housing 46, thereby improving robustness. In addition, the module housing 46 may be integrally formed with a backrest backboard constituting the back side of the seat back 16.

[0074] like Fig. 9As shown, at the initial stage of the expansion and deployment of the airbag 32, 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 by receiving the supply of gas from the first gas supply path 60A and the second gas supply path 60B. At this time, the deployment direction of the pair of front and rear extensions 34A is set to a direction that forms an acute angle with respect to the ceiling 24 of the vehicle cabin R. In addition, at this time, the deployment direction of the pair of front and rear extensions 34A is a direction that is inclined toward the outside in the seat width direction relative to the seat front and rear direction when viewed from above.

[0075] On the other hand, the rear connecting portion 34D of the front-rear chamber 34 is inflated and deployed toward the front and upper side of the seat by receiving the gas supply from the third gas supply path 60C. Thus, while the pair of front-rear extensions 34A are deployed, the front connecting portion 34B and the airbag body 40 stored in the rear connecting portion 34D on the front side of the seat are pushed toward the front and upper side of the seat by the inflation pressure of the rear connecting portion 34D.

[0076] The pair of front and rear extensions 34A that are inflated and deployed extend in the front-rear direction at the left and right sides of the head H of the occupant D, and are opposed to the head H with gaps therebetween from the left and right sides. By the operation of the pair of front and rear extensions 34A, the front connection 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 cabin R from the rear side to the front side, and are inflated and deployed at the front side of the seat of the occupant D.

[0077] In addition, the pair of front and rear extensions 34A are pulled backward and obliquely downward by the pair of left and right rear ties 54 described later, so as to be inclined in a manner of descending toward the front. The front ends of the pair of inflated and expanded front and rear extensions 34A are connected in the left-right direction by the inflated and expanded front connecting portion 34B. Figure 3 As shown in FIG. 1 , the front and rear chamber 34 including the pair of front and rear extensions 34A, the front connection portion 34B, and the rear connection portion 34D expands and expands in a ring shape when viewed from above. In addition, a U-shaped portion formed by the pair of front and rear extensions 34A and the front connection portion 34B, which is open rearward when viewed from above, expands and expands on the seat front side of the headrest 18.

[0078] More specifically, Figure 1 , Figure 2 , Figure 4 as well as Figure 5As shown, an enlarged portion 34B1 having a larger size in the vertical direction than the left and right ends of the front connecting portion 34B is provided at the left-right central portion of the inflated and deployed front connecting portion 34B. The enlarged portion 34B1 protrudes downward compared with the left and right ends of the front connecting portion 34B. The aforementioned connecting hole 48 is formed in the enlarged portion 34B1. The connecting hole 48 is located at the rear side of the left-right central portion of the inflated and deployed front connecting portion 34B. The gas from the inflator 44 passes through the connecting hole 48 and is supplied to the airbag body 40 toward the rear. As a result, the airbag body 40 is delayed from the front and rear chambers 34 at the rear of the front connecting portion 34B and is inflated and deployed toward the passenger D side (rear side). After the airbag body 40 passes through the gap between the head H of the passenger D and the roof of the vehicle from the rear side to the front side through the expansion and expansion of the front and rear chambers 34, it is inflated and deployed toward the rear side.

[0079] The inflated and deployed airbag main body 40 faces the head H, chest C, and abdomen B of the occupant D from the front side with a gap therebetween.

[0080] like Figures 11 to 13 As shown in FIG. 1 , the inflated and deployed airbag body 40 restrains the occupant D who is inertially moving forward due to the impact of the vehicle collision from the front side. During the occupant restraint, the front and rear chambers 34 expand in the front and rear directions, and the airbag body 40 is compressed in the front and rear directions. Figure 12 to Figure 13 As shown, the airbag body 40 is shaped so as to be sandwiched between the thighs F and the chest C of the occupant D from the middle to the late stage of the occupant restraint.

[0081] The airbag 32 of the above structure is provided with 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. The rear tethers 54, the front upper tethers 56, and the front lower tethers 58 are formed of, for example, nylon or polyester fabrics in the form of long strips. The fabrics forming the rear tethers 54, the front upper tethers 56, and the front lower tethers 58 are formed to be more difficult to stretch than the base fabrics 36, 38 forming the front and rear chambers 34 and the base fabric 42 forming the airbag body 40. The degree of difficulty in stretching can be adjusted by the material and thickness of the fabrics.

[0082] Each one end portion of the pair of rear tethers 54 is respectively secured (sewn) to the middle portion in the longitudinal direction of the pair of front and rear extensions 34A (specifically, the front portion of each inflated and deployed front and rear extensions 34A). Each other end portion of the pair of rear tethers 54 is respectively secured to the seat back 16 or the vehicle body (not shown) at the rear side relative to the occupant D. In the inflated and deployed state of the airbag 32, the pair of rear tethers 54 extend in the front-to-rear direction below the pair of front and rear extensions 34A. In this state, the pair of rear tethers 54 are in a posture inclined in a downward direction toward the rear. Thus, the pair of front and rear extensions 34A are configured so that they are pulled rearward and obliquely downward by the pair of rear tethers 54 (see Fig.14 As a result, the airbag 32 is prevented from swinging in the vertical direction and the front-rear direction when the airbag 32 is inflated and deployed (see arrow P1). Fig.14 The airbag 32 is shown by the double-dashed line in FIG.

[0083] The pair of front and rear extensions 34A are pulled as described above, so that when the occupant is restrained by the airbag 32, 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 occupant is restrained by the airbag 32, 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 Fig.15 In addition, in the present embodiment, although the occupant D is AM50, 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 abut against the left and right shoulders K of the occupant D even when the occupant D is AM95 (95th percentile of American adult males) or AF05 (5th percentile of American adult females).

[0084] A pair of front upper tethers 56 respectively connect the left and right sides of the front portion of the upper portion of the airbag body 40 that expands and deploys upward compared to the front and rear chambers 34 and the front portion of the pair of front and rear extensions 34A. One end portion of each pair of front upper tethers 56 is sewn to the left and right sides of the front portion of the upper portion of the airbag body 40 that expands and deploys upward compared to the front and rear chambers 34. The other end portion of each pair of front upper tethers 56 is sewn to the front portion of the pair of front and rear extensions 34A. The pair of front upper tethers 56 suppress the airbag body 40 from rotating upward around the front connection portion 34B when the airbag 32 is inflated and deployed (see Fig.16 40 is an airbag body shown by a two-dot chain line.

[0085] The pair of front lower tethers 58 respectively connect the left and right sides of the lower portion of the airbag body 40 that expands and deploys downwardly compared to the front and rear chambers 34 and the front portion of the pair of front and rear extensions 34A. One end portion of each pair of front lower tethers 58 is sewn to the left and right sides of the lower portion of the airbag body 40 that expands and deploys downwardly compared to the front and rear chambers 34. The other end portions of each pair of front lower tethers 58 are sewn to the front portion of the pair of front and rear extensions 34A. The pair of front lower tethers 58 suppress the downward rotation of the airbag body 40 around the front connection portion 34B when the airbag 32 is inflated and deployed (see Fig.17 40 is an airbag body shown by a two-dot chain line.

[0086] In addition, if Fig.18 As shown in FIG. 1 , when one end of each pair of front upper tethers 56 is sewn to the left and right sides of the rear portion of the upper portion of the airbag body 40 that expands and deploys upward relative to the front and rear chambers 34, the following problem occurs. Fig.19 As shown, when the occupant is restrained by the airbag 32, the pair of front upper tethers 56 are pushed out, thereby hindering the compression deformation of the airbag body 40. Therefore, one end of each of the pair of front upper tethers 56 needs to be sewn to the left and right sides of the front portion of the upper portion of the airbag body 40 that expands and deploys upwardly compared to the front and rear chambers 34.

[0087] The airbag device 30 is provided with a control unit (ECU) (not shown) for controlling the operation of a pair of inflators 44. The control unit is electrically connected to the pair of inflators 44 and a collision sensor (not shown). The control unit can detect or predict the occurrence of various types of frontal collisions (or situations where a frontal collision cannot be avoided) for the automobile to which the airbag device 30 is applied, based on information from the collision sensor, according to each type of collision described later.

[0088] When a frontal collision is detected or predicted based on information from the collision sensor, the control device activates each inflator 44. In addition, the types of frontal collisions in which the control device activates the inflator 44 include eccentric frontal collisions such as oblique collisions and small overlap collisions in addition to full overlap frontal collisions.

[0089] (Function and Effect)

[0090] Next, the operation and effects of the first embodiment will be described.

[0091] The occupant protection device 10 according to the present embodiment includes a vehicle seat 12 on which an occupant D of a vehicle sits, and an airbag device 30 for protecting the occupant D in a vehicle collision. In the airbag device 30, gas generated from each inflator 44 in a vehicle collision is supplied to the airbag 32. Thus, the airbag 32 is configured to expand and deploy from the seat rear side to the seat front side of the upper portion of the vehicle seat, and pass between the ceiling 24 of the vehicle cabin R and the head H of the occupant D.

[0092] Here, the airbag 32 has at least one gas supply path 60 disposed toward the front side of the seat, and the incident angle θ1 of the gas supply path 60 relative to the ceiling is set to an acute angle when viewed from the side in the seat width direction. As a result, the airbag 32 can be deployed in a direction that is an acute angle relative to the ceiling 24 of the vehicle compartment R when viewed from the side, thereby suppressing the airbag 32 from getting stuck on the ceiling 24. In addition, since the airbag 32 is deployed from the seat rear side to the oblique upper side of the headrest 18, interference with the head H of the occupant D at the upper side of the headrest 18 is also suppressed. As a result, the deployment performance of the airbag 32 that is inflated and deployed from the seat rear side to the seat front side of the upper portion of the vehicle seat can be improved.

[0093] The incident angle θ1 of the gas supply path 60 with respect to the ceiling 24 of the vehicle interior R can be set to an acute angle within a range of 15° to 35°, and is more preferably set to 25°.

[0094] The airbag 32 of the present embodiment includes a front and rear chamber 34 and an airbag body 40. The front and rear chamber 34 passes through the left and right sides of the head H of the occupant D sitting on the vehicle seat, and the left and right front and rear extensions 34A are expanded and deployed toward the front side of the seat. In addition, the front connecting portion 34B that connects the front ends of the pair of front and rear extensions 34A in the seat width direction passes between the ceiling 24 of the vehicle R and the head H of the occupant D, and is arranged in front of the occupant D. Then, the airbag body 40 is configured to expand and deploy toward the occupant D side at the rear side of the front connecting portion 34B of the seat with a delay from the front and rear chamber 34. As a result, when the airbag 32 is supplied with gas from the gas supply path 60, the left and right front and rear extensions 34A are deployed in a direction that forms an acute angle with respect to the ceiling, thereby preventing the front connecting portion 34B and the airbag body 40 from being stuck on the ceiling 24 of the vehicle R. Furthermore, since the front connecting portion 34B and the airbag main body 40 are deployed obliquely upward from the headrest 18 , interference with the head H of the occupant D at the upper side of the headrest 18 is also suppressed.

[0095] Furthermore, the airbag body 40 expands the front and rear chambers 34 in the seat front and rear direction when the occupant D is restrained, and the airbag body 40 is compressed in the seat front and rear direction. The airbag 32 can improve energy absorption performance by the compression deformation of the airbag body 40 .

[0096] In addition, in the present embodiment, as the gas supply path 60, a first gas supply path 60A and a second gas supply path 60B provided at the rear end of the pair of front and rear extensions are included. The first gas supply path 60A and the second gas supply path 60B are inclined toward the outer side in the seat width direction at a predetermined inclination angle θ2 relative to the seat front and rear direction when viewed from above. Therefore, when the airbag 32 is supplied with gas from the first gas supply path 60A and the second gas supply path 60B, the pair of front and rear extensions 34A are inflated and deployed obliquely toward the front side of the seat and the outer side in the seat width direction through the left and right sides of the head H of the occupant D. Thus, even if the position of the head H of the occupant D is offset in the seat width direction, such as when the occupant D sleeps leaning against the window, the interference between the pair of front and rear extensions 34A and the head H of the occupant D at the side of the headrest 18 is suppressed.

[0097] In the present 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 within a range of 10° to 45°, and is more preferably set to 15°.

[0098] In the present embodiment, the front and rear chamber 34 has a rear connection portion 34D that connects the rear ends of the pair of front and rear extension portions 34A in the seat width direction. The rear connection portion 34D is stored on the seat rear side of the airbag body 40 before gas is supplied. Thus, when gas is supplied from the gas supply path 60, the rear connection portion 34D expands on the seat rear side of the airbag body 40, thereby being able to push the airbag body 40 toward the seat front side. As a result, the robustness of the airbag body 40 during expansion and deployment can be improved, and the movement when passing between the ceiling 24 of the vehicle cabin R and the head H of the occupant D can be stabilized.

[0099] In addition, in the present embodiment, a third gas supply path 60C connected to the rear side surface of the rear connecting portion 34D is included as the gas supply path 60. Thus, the rear connecting portion 34D can be rapidly inflated and deployed toward the front side of the seat through the third gas supply path 60C. Thus, at the initial stage of inflation and deployment, the airbag body 40 is pushed out in a direction forming an acute angle with respect to the ceiling 24 of the vehicle cabin R, so that the movement of the airbag body 40 when passing between the ceiling 24 of the vehicle cabin R and the head H of the occupant D can be made more stable.

[0100] Furthermore, in the present embodiment, the airbag body 40 is inflated and deployed toward the occupant D side (i.e., the rear side) at the rear side of the front connecting portion 34B after the front and rear chambers 34 are inflated and deployed. As a result, the gap between the airbag body 40 and the occupant D is reduced. As a result, the occupant D is restrained by the airbag body 40 at an early stage, and thus the initial restraint performance of the occupant D by the airbag body 40 can be improved.

[0101] Furthermore, in the present embodiment, the airbag body 40 is supplied with gas from the inflator 44 through the communication hole 48 located at the rear side of the left-right center portion of the front connecting portion 34B of the front and rear chambers 34 in the inflated and deployed state. That is, the gas that has passed through the pair of front and rear extensions 34A and the front connecting portion 34B of the front and rear chambers 34 is supplied to the airbag body 40 from the communication hole 48 toward the rear side. As a result, the airbag body 40 can be inflated and deployed sufficiently delayed from the front and rear chambers 34. As a result, for example, the airbag 32 can be easily inflated and deployed through a narrow gap between the head H of the occupant D and the ceiling 24 of the vehicle cabin R.

[0102] That is, in the present embodiment, the airbag body 40 is expanded and deployed toward the rear side after passing through the gap between the head H of the occupant D and the ceiling 24 of the vehicle cabin R from the rear side to the front side due to the expansion and expansion of the front and rear chambers 34. Thus, it is easy to prevent the airbag body 40 from getting stuck in the above-mentioned gap, and thus it is easy to prevent the airbag from being poorly deployed.

[0103] In addition, in the present embodiment, the base fabrics 36 and 38 constituting the front and rear chambers 34 are made of base fabrics that are more difficult to stretch than the base fabric 42 constituting the airbag body 40. Specifically, the front and rear chambers 34 are structured by overlapping two base fabrics 36 and 38 and sewing their peripheral edges together, and one or both of the two base fabrics 36 and 38 are the above-mentioned base fabrics that are difficult to stretch. Fig. 20 As shown, a structure in which a base fabric 37 which is more difficult to stretch than the base fabric of the airbag body 40 is provided between the two base fabrics 36 and 38 may be adopted. Fig. 20 In the illustrated structure, the two base fabrics 36 and 38 are set to have the same degree of difficulty in stretching as the base fabric 42 constituting the airbag body 40 .

[0104] By forming the front and rear chambers 34 in the above manner, Fig.21 As shown in the solid line graph in FIG. 1 , the energy absorption amount achieved by the front and rear chambers 34 extending in the front and rear directions can be increased. Fig.21In FIG. 4 , the vertical axis f represents the load applied from the airbag body 40 to the chest C of the occupant D, and the horizontal axis S represents the displacement of the chest C of the occupant D. Fig.21 In FIG. 1 , the double-dashed line graph shows that the base fabric constituting the front and rear chambers 34 has the same stretching difficulty as the base fabric constituting the airbag body 40. By configuring as in this embodiment, Fig.21 In the interval (2) to (3), the energy absorption is particularly improved. In addition, when the front and rear chambers 34 are structured without the base fabric 37, the number of base fabrics and the volume of the folded airbag 32 can be made equal. Fig. 20 In this embodiment, since the front and rear chambers 34 and the airbag body 40 are made of separate base fabrics, the stretch difficulty of the base fabric of the front and rear chambers 34 can be changed to the stretch difficulty of the base fabric of the airbag body 40 .

[0105] Furthermore, in the present embodiment, the airbag body 40 is shaped so as to be sandwiched between the thigh F and the chest C of the occupant D from the middle to the late stage when the occupant is restrained by the airbag 32. As a result, the upper body of the occupant D can be brought into contact with the airbag body 40 over a wide area, and thus the load applied to the occupant D from the airbag body 40 can be reduced well.

[0106] Furthermore, according to the present embodiment, when the occupant D is restrained by the airbag 32, a pair of rear tethers 54, each having one end sewn to a pair of front and rear extensions 34A of the front and rear chambers 34 and each having the other end locked to the seat back 16 or the vehicle body at the rear side of the seat relative to the occupant D, pull the pair of front and rear extensions 34A obliquely downward to the rear of the seat. When the occupant is restrained by the airbag body 40, the pair of rear tethers 54 extend in the front and rear direction together with the front and rear chambers 34. These rear tethers 54, together with the front and rear chambers 34, receive the load applied from the occupant D to the airbag body 40, thereby serving as a supporting member.

[0107] Furthermore, the above-mentioned pulling by the pair of rear tethers 54 can suppress the swinging of the airbag 32 in the vertical direction and the front-rear direction at the end of inflation and deployment. Furthermore, the above-mentioned pulling by the pair of rear tethers 54 causes the lower surfaces of the pair of front-rear extensions 34A to contact the left and right shoulders K of the occupant D. Thus, regardless of the physique difference of the occupant D, the position of the airbag body 40 relative to the head H of the occupant D in the vertical direction can be stabilized.

[0108] Furthermore, in the present embodiment, the front portion of the upper portion of the airbag body 40 that is inflated and deployed upwardly relative to the front and rear chambers 34 and the pair of front and rear extension portions 34A of the front and rear chambers 34 are respectively connected by a pair of front upper tethers 56. Thus, it is possible to suppress the inflated and deployed airbag body 40 from being accidentally displaced (rotated) upwardly relative to the front and rear chambers 34 around the front connecting portion 34B.

[0109] Furthermore, in the present embodiment, the lower portion of the airbag body 40 that is inflated and deployed downwardly relative to the front and rear chambers 34 and the pair of front and rear extension portions 34A of the front and rear chambers 34 are connected by a pair of front lower tethers 58. Thus, it is possible to suppress the inflated and deployed airbag body 40 from being accidentally displaced (rotated) downwardly relative to the front and rear chambers 34 around the front connecting portion 34B.

[0110] (About the change example)

[0111] Although one embodiment of the present disclosure has been described above, the present disclosure can be implemented with various modifications without departing from the gist of the present disclosure. It goes without saying that the technical scope of the present disclosure is not limited to the above embodiment.

[0112] For example, in the above-described embodiment, the airbag device 30 is configured to include three inflators 44, but the number of inflators 44 can be changed as appropriate. Fig. 22 As in the illustrated airbag device 80 , a structure in which one inflator 44 is mounted may be adopted.

[0113] In the airbag device 80, the airbag 32 is inflated and deployed by receiving gas supplied from an inflator 44 via a diffuser 82 communicating with the interior of the front and rear chambers 34. Since the structure of the airbag 32 is the same as that of the above-described embodiment, detailed description thereof will be omitted.

[0114] The diffuser 82 is made of a metal pipe and has a straight region facing the front-rear chamber 34. Specifically, the diffuser 82 is connected to the rear end portions of the pair of front-rear extension portions 34A of the front-rear chamber 34, and has a first tubular portion 84 and a second tubular portion 86 that form the straight region. In addition, the diffuser 82 is connected to the center portion in the longitudinal direction of the rear connecting portion 34D of the front-rear chamber 34, and has a third tubular portion 88 that forms the straight region.

[0115] 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 the first gas supply path 60A similar to the above embodiment. The second tubular portion 86 forms the second gas supply path 60B similar to the above embodiment. The third tubular portion 88 forms the third gas supply path 60C similar to the above embodiment.

[0116] Since the first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60C have the same structure as that of the above-mentioned embodiment, detailed description thereof will be omitted.

[0117] In addition, the diffuser 82 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 rear side of the seat. The fourth tubular portion 90 has a lower end portion extending in the vertical direction of the seat, and a gas outlet of the inflator 44 is fixed to the lower end portion. Therefore, when the gas is ejected from the inflator 44, the gas passes through the fourth tubular portion 90 of the diffuser 82 and is supplied to the first tubular portion 84, the second tubular portion 86, and the third tubular portion 88. In addition, the gas is supplied from the first tubular portion 84 and the second tubular portion 86 to the pair of front and rear extension portions 34A of the front and rear chamber 34. In addition, the gas is supplied from the third tubular portion 88 to the rear connecting portion 34D of the front and rear chamber 34.

[0118] The inflator 44 is arranged in a posture with the axial direction along the vertical direction of the seat back 16. For example, a pair of upper and lower stud bolts are provided on each inflator 44. The pair of stud bolts penetrates the diffuser 82, the module housing 46, and a frame (not shown) of the seat back 16, and a nut is screwed on each stud bolt. Thus, the diffuser 82, the inflator 44, and the module housing 46 are fixed to the frame of the seat back 16.

[0119] In the airbag device 80 having such a structure, the airbag 32 can also be inflated and deployed in the same manner as in the above-described embodiment, and thus the same operation and effects can be obtained.

[0120] Furthermore, in the airbag device 80 , since the airbag 32 can be inflated and deployed by receiving gas supply from one inflator 44 , the number of inflators mounted can be reduced compared to the above-described embodiment, thereby achieving a reduction in manufacturing cost.

[0121] Furthermore, in the airbag device 80 , the axial direction of the inflator 44 is arranged along the vertical direction of the seat back 16 , so that the module case 46 can be thinned in the seat front-rear direction, thereby achieving miniaturization of the airbag device 80 .

[0122] In addition, although the above-mentioned embodiment is configured to supply gas to the first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60C simultaneously, the present invention is not limited thereto. For example, from the viewpoint of pushing the airbag body 40 toward the front side of the seat immediately after the start of inflation and deployment of the airbag 32, the supply of gas to the first gas supply path 60A and the second gas supply path 60B may be delayed from the start of the third gas supply path 60C.

[0123] In addition, although in the above embodiment, the gas supply path 60 is provided with the first gas supply path 60A, the second gas supply path 60B, and the third gas supply path 60C, the present invention is not limited thereto. For example, the third gas supply path 60C may be omitted. In this case, the structure of the airbag 32 may be set to a structure in which the rear connecting portion 34D is omitted.

Claims

1. An airbag device comprising: an inflator, which generates gas in the event of a vehicle collision; The airbag is supplied with the gas, expands and deploys from the rear side of the upper portion of the vehicle seat to the front side of the seat, and passes between the ceiling of the vehicle compartment and the head of the occupant sitting on the vehicle seat. The airbag has at least one gas supply path that is provided toward the front side of the seat and whose incident angle with respect to the ceiling is set to an acute angle when viewed from the side in the seat width direction.

2. The airbag device according to claim 1, wherein: The incident angle is set to 15° to 35°.

3. The airbag device according to claim 1 or 2, wherein: The airbag has: a front and rear chamber having a pair of front and rear extensions and a front connecting portion, wherein the pair of front and rear extensions extend through the left and right sides of the head of an occupant seated on the vehicle seat and expand toward the front side of the seat, and the front connecting portion connects the front ends of the pair of front and rear extensions in the seat width direction; An airbag body is inflated and deployed toward the occupant side at the seat rear side of the front connection portion with a delay from the front and rear chambers, and when restraining the occupant, the front and rear chambers are expanded in the seat front and rear direction and the airbag body is compressed in the seat front and rear direction.

4. The airbag device according to claim 3, wherein: The gas supply path includes a first gas supply path and a second gas supply path provided at rear ends of the pair of front and rear extensions, The first gas supply path and the second gas supply path 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.

5. The airbag device according to claim 4, wherein: The inclination angle is set to 10° to 45°.

6. The airbag device according to claim 3, wherein: The front-rear chamber further includes a rear connecting portion that is housed on the seat rear side of the airbag body before the gas is supplied and connects rear end portions of the pair of front-rear extending portions in a seat width direction.

7. The airbag device according to claim 6, wherein: The gas supply path includes a third gas supply path connected to a rear side surface of the rear connecting portion.

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