Seat back

Abstract

To allow an airbag to reach a surface of a seat back more quickly during deployment in a vehicle seat.SOLUTION: A vehicle seat 1 includes: a seat cushion 5 including a seat cushion frame 12; a seat back including a seat back frame 22 connected to a rear part of the seat cushion frame and an airbag module 60 coupled to a side surface at the vehicle outer side of the seat back frame; and a side cover 55 provided at the vehicle outer side of the seat cushion frame. An airbag 71 to be deployed from the airbag module includes a waist protection part 76 which reaches a side surface at the vehicle outer side of the seat cushion during deployment. A guide surface 96 which guides the waist protection part forward during deployment of the airbag is provided on the side cover.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle seat, in particular to a vehicle seat equipped with an airbag module. [Background technology]

[0002] A vehicle seat equipped with a side airbag device (airbag module) in a seat back is known (for example, see Patent Document 1). In the vehicle seat described in Patent Document 1, the side airbag includes a bag portion (upper bag portion) that inflates toward the head of the seated occupant, and a bag portion (lower bag portion) that inflates toward the waist. The vehicle seat is provided with webbing that is sewn at positions corresponding to the upper bag portion and the lower bag portion.

[0003] When the airbag is deployed, it breaks at the positions corresponding to the upper bag portion and the lower bag portion, so that the upper bag portion and the lower bag portion inflate and deploy separately, and the direction of inflation and deployment of each bag portion is stably determined. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-114637 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the vehicle seat, the lower part of the seat back is configured to have a greater thickness in the front-rear direction than other parts. Therefore, in the vehicle seat of Patent Document 1, the time from the start of deployment until the lower bag part reaches the surface of the seat back is longer than that of the upper bag part, resulting in a problem of delayed deployment of the lower bag part.

[0006] In view of the above background, an object of the present invention is to enable an airbag to reach the surface of a seat back more quickly when deployed in a vehicle seat. [Means for solving the problem]

[0007] In order to solve the above problems, a vehicle seat (1, 201) has a seat cushion (5) including a seat cushion frame (12), a seat back including a seat back frame (22) connected to a rear portion of the seat cushion frame and an airbag module (60) coupled to the vehicle exterior side of the seat back frame, and a side cover (55) provided on the vehicle exterior side of the seat cushion frame, wherein an airbag (71) to be deployed from the airbag module includes a lumbar protection portion (76) that reaches the vehicle exterior side of the seat cushion when deployed, and a guide surface (96) that guides the lumbar protection portion forward when the airbag is deployed is provided on the side cover.

[0008] According to this configuration, when the seat back is inflated by the airbag deployment and reaches the guide surface, the lumbar protection section is guided to inflate forward. Therefore, the lumbar protection section can be inflated more quickly toward the front edge of the seat back. This allows the lumbar protection section to reach the surface of the seat back more quickly, and the airbag can be deployed at a higher speed to a position corresponding to the lumbar part of the occupant.

[0009] In the above aspect, the guide surface may be inclined downward toward the front.

[0010] According to this configuration, when the airbag is deployed, the lumbar protection section can be guided to deploy forward.

[0011] In the above aspect, the guide surface may be curved so as to be convex upward.

[0012] With this configuration, the side cover is less likely to deform due to a load from above, which makes it possible to prevent deformation of the side cover when deployed and to properly guide the deployment of the lumbar protection section.

[0013] In the above aspect, it is preferable that a step (98) that is high on the vehicle outer side is connected to the guide surface.

[0014] According to this configuration, the lumbar protection section is prevented from inflating toward the outside of the vehicle due to the step when the airbag is deployed, and the deployment direction of the lumbar protection section can be concentrated more toward the front.

[0015] In the above aspect, it is preferable to provide a support member (202) fixed to the seat back frame in order to support from below the portion of the side cover that corresponds to the guide surface.

[0016] According to this configuration, when the lumbar protection section reaches the guide surface during airbag deployment, the side cover is supported from below by the support member, thereby preventing deformation of the side cover and allowing the guide surface to guide the lumbar protection section in the appropriate direction.

[0017] In order to solve the above problem, a vehicle seat (101) is provided, comprising a seat cushion (5) including a seat cushion frame (12), a seat back frame (22) connected to a rear portion of the seat cushion frame, and a seat back (6) including an airbag module (60) joined to the vehicle exterior side of the seat back frame, wherein an airbag (71) to be deployed from the airbag module includes a lumbar protection section (76) that should reach a lower end portion of the seat back frame when deployed, and the lower end portion of the seat back frame is provided with a support member (102) having a guide surface (104A) that guides the lumbar protection section when the airbag is deployed.

[0018] According to this configuration, when the lumbar protection section reaches the lower end portion of the seat back due to the deployment of the airbag, the lumbar protection section is guided by the guide surface of the support member to inflate forward. This allows the lumbar protection section to inflate more quickly toward the front edge of the seat back. This allows the lumbar protection section to reach the surface of the seat back more quickly, and the airbag to be deployed at a higher speed in a position corresponding to the lumbar region of the occupant.

[0019] In the above aspect, the guide surface may be inclined downward toward the front.

[0020] According to this configuration, when the airbag is deployed, the lumbar protection section can be guided to deploy forward.

[0021] In the above aspect, the guide surface may be curved so as to be convex upward.

[0022] According to this configuration, the airbag is less likely to come into contact with the edge of the support portion when the airbag is deployed, which allows the airbag to be deployed appropriately.

[0023] In addition, in the above-mentioned aspect, the support member has an exterior connection portion (103A) connected to the side surface on the exterior side of the seat back frame, a rear connection portion (103B) connected to the rear surface of the seat back frame, and a support portion (104) extending from the exterior connection portion to the exterior side of the vehicle, and the guide surface is preferably formed on an upper surface of the support portion.

[0024] According to this configuration, the guide surface can be formed by the support member, and the seat back frame can be reinforced by the support member.

[0025] In the above aspect, the seat back frame includes a pair of left and right back side frames (25), the seat cushion frame includes a pair of left and right cushion side frames (15) facing each other at the rear, sandwiching the lower parts of the two back side frames, a tilting axis (29) that penetrates the left and right back side frames to connect the left and right cushion side frames and rotatably connects the seat back frame and the seat cushion frame to each other, a receiving hole (105) through which the tilting axis passes is provided in the vehicle exterior joint, and a welded portion (106) that is welded to the back side frame located on the vehicle exterior is provided on an edge of the vehicle exterior joint and an edge of the rear joint, and the welded portion surrounds the receiving hole at the vehicle exterior joint.

[0026] According to this configuration, the support member is welded to the vehicle exterior side and rear surface of the back side frame, so that the rigidity of the back side frame can be increased. Also, by providing a receiving hole in the vehicle exterior joint portion, the support member can be joined to the seat cushion frame without interfering with the tilting shaft. Also, since a plurality of welds are provided so as to surround the receiving hole, the rigidity of the support member can be increased. Effect of the Invention

[0027] In order to solve the above problem, a vehicle seat includes a seat cushion including a seat cushion frame, a seat back including a seat back frame connected to a rear part of the seat cushion frame, an airbag module connected to a side surface of the seat back frame on the vehicle exterior side, and a side cover provided on the vehicle exterior side of the seat cushion frame, and an airbag to be deployed from the airbag module includes a lumbar protection part that reaches the side surface of the seat cushion on the vehicle exterior side when deployed, and a guide surface is provided on the side cover for guiding the lumbar protection part forward when the airbag is deployed. When the seat back is inflated by the deployment of the airbag and reaches the guide surface, the lumbar protection part is guided to inflate forward. Therefore, the lumbar protection part can be inflated toward the front edge of the seat back more quickly. This allows the lumbar protection part to reach the surface of the seat back more quickly, and the airbag can be deployed at a higher speed to a position corresponding to the occupant's lumbar part.

[0028] Furthermore, in the above aspect, if the guide surface is configured to be inclined downward toward the front, the lumbar protection portion can be guided to deploy forward when the airbag deploys.

[0029] In the above-described aspect, if the guide surface is curved convexly upward, the airbag is less likely to come into contact with the edge of the support portion during deployment, thereby enabling the airbag to be deployed properly.

[0030] In the above-mentioned aspect, if a high step is connected to the guide surface on the vehicle exterior side, the step prevents the lumbar protection part from inflating toward the vehicle exterior when the airbag is deployed. This allows the lumbar protection part to be deployed more concentrated toward the front.

[0031] In the above-mentioned aspect, if a support member is provided that is fixed to the seat back frame to support from below the portion of the side cover that corresponds to the guide surface, when the lumbar protection part reaches the guide surface during airbag deployment, the support member supports the side cover from below, thereby preventing deformation of the side cover and allowing the guide surface to guide the lumbar protection part in the appropriate direction.

[0032] In order to solve the above problem, a vehicle seat includes a seat cushion including a seat cushion frame, a seat back frame connected to a rear portion of the seat cushion frame, and a seat back including an airbag module connected to a vehicle exterior side surface of the seat back frame, and an airbag to be deployed from the airbag module includes a lumbar protection part that is to reach a lower end portion of the seat back frame when deployed, and a support member having a guide surface that guides the lumbar protection part when the airbag is deployed is provided at the lower end portion of the seat back frame. When the lumbar protection part reaches the lower end portion of the seat back due to the deployment of the airbag, the guide surface of the support member guides the lumbar protection part to inflate forward. This allows the lumbar protection part to inflate more quickly toward the front edge of the seat back. This allows the lumbar protection part to reach the surface of the seat back more quickly, and the airbag to be deployed at a higher speed to a position corresponding to the occupant's lumbar part.

[0033] Furthermore, in the above aspect, if the guide surface is configured to be inclined downward toward the front, the lumbar protection section can be guided to deploy forward when the airbag deploys.

[0034] In the above-described aspect, if the guide surface is curved convexly upward, the airbag is less likely to come into contact with the edge of the support portion during deployment, which allows the airbag to be deployed properly.

[0035] In addition, in the above-mentioned aspect, the support member has an exterior connection portion connected to the exterior side of the seatback frame, a rear connection portion connected to the rear surface of the seatback frame, and a support portion extending from the exterior connection portion to the exterior side of the vehicle, and according to a configuration in which a guide surface is formed on the upper surface of the support portion, the guide surface can be formed by the support member and the seatback frame can be reinforced by the support member.

[0036] In the above embodiment, the seat back frame includes a pair of left and right back side frames, the seat cushion frame includes a pair of left and right cushion side frames facing each other on the left and right sides with the lower parts of the two back side frames in between at the rear, a tilting shaft that penetrates the left and right back side frames to connect the left and right cushion side frames and rotatably connects the seat back frame and the seat cushion frame to each other, a receiving hole is provided at the vehicle exterior joint portion for passing the tilting shaft, and a welded portion that is welded to the back side frame located on the vehicle exterior is provided at the edge of the vehicle exterior joint portion and the edge of the rear joint portion, and the welded portion surrounds the receiving hole at the vehicle exterior joint portion. This configuration allows the support member to be welded to the vehicle exterior side surface and rear surface of the back side frame, thereby increasing the rigidity of the back side frame. Also, by providing the receiving hole at the vehicle exterior joint portion, the support member can be joined to the seat cushion frame without interfering with the tilting shaft. Also, a plurality of welded portions are provided to surround the receiving hole, thereby increasing the rigidity of the support member. [Brief description of the drawings]

[0037] [Figure 1] FIG. 1 is a perspective view of a vehicle seat according to a first embodiment; [Diagram 2] FIG. 1 is an exploded perspective view of a vehicle seat according to a first embodiment; [Diagram 3] 1A is a rear view of a vehicle seat according to a first embodiment when a pad member and a cover material are removed, and FIG. 1B is a side view of the vehicle seat according to the first embodiment. [Figure 4] IV-IV cross-sectional view of FIG. 1 and an enlarged view of the portion surrounded by the dashed line in the cross-sectional view. [Diagram 5] FIG. 1 is an explanatory diagram for explaining the connection of a clip and a hook; [Figure 6] Schematic diagrams showing the state of the airbag (A) immediately after the start of deployment, (B) when the left bolster contacts the guide surface, (C) after a predetermined time has elapsed since (B), and (D) when deployment is complete. [Figure 7] FIG. 13 is an exploded perspective view of a vehicle seat according to a second embodiment; [Figure 8] 1A is a rear view of a vehicle seat according to a second embodiment when a pad member and a cover material are removed, and FIG. 1B is a side view of the vehicle seat according to the second embodiment. [Figure 9] FIG. 11 is a side view of a vehicle seat according to a third embodiment when a pad member and a cover material are removed; [Figure 10] FIG. 13 is an explanatory diagram for explaining a modified example of the clip; [Figure 11] FIG. 13 is an explanatory diagram illustrating a modified example in which an airbag module is connected to a side frame via a bracket. [Figure 12] FIG. 13 is an explanatory diagram for explaining a modified example in which a clip is provided in front of the slit; [Figure 13] FIG. 13 is an explanatory diagram for explaining a modified example in which the clip is connected to the side frame. [Figure 14] FIG. 13 is an explanatory diagram for explaining a modified example of a side cover; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which a vehicle seat according to the present invention is applied to a vehicle seat mounted in an automobile will be described with reference to the drawings.

[0039] <<First embodiment>> As shown in FIG. 1, a vehicle seat 1 according to the first embodiment is placed on a floor 3 that defines the bottom of a passenger compartment 2, facing the front of the vehicle (more specifically, so that a seated occupant faces the front of the vehicle). The vehicle seat 1 is supported on the floor 3 so as to be able to slide back and forth. In this embodiment, the vehicle seat 1 constitutes a passenger seat disposed next to the driver's seat. In the following description, the front-rear, left-right, and up-down directions are defined based on the directions as seen by an occupant seated in the vehicle seat 1.

[0040] The vehicle seat 1 includes a seat cushion 5 that supports the buttocks of a seated occupant, a seat back 6 that is provided at the rear of the seat cushion 5 and functions as a backrest, and a headrest 7 provided at the upper part of each seat back 6.

[0041] The seat cushion 5 is generally rectangular and has a surface facing generally in the vertical direction. The upper surface of the seat cushion 5 constitutes a seating surface 9 for one occupant. The seating surface 9 is recessed downwards at approximately the center in the left-right direction and is inclined slightly downwards toward the rear. This allows the seating surface 9 to have a shape that corresponds to the buttocks and thighs of the occupant. When the occupant sits down, the buttocks and thighs of the occupant are placed on the seating surface 9.

[0042] The seat back 6 includes a seat back central portion 6A extending in the up-down direction, and bolster portions 6B provided on the left and right sides of the seat back central portion 6A. The seat back central portion 6A is substantially rectangular parallelepiped-shaped with a surface facing substantially in the front-rear direction. The front surface of the seat back central portion 6A constitutes a backrest surface 10 that supports the back of the occupant. The backrest surface 10 is recessed backward at substantially the center in the left-right direction, and is inclined slightly backward toward the upper side. As a result, the backrest surface 10 has a shape that corresponds to the back of the occupant, and the back of the occupant is supported by the backrest surface 10.

[0043] The bolster portion 6B is connected to the upper left and right side surfaces of the seatback central portion 6A, respectively. The bolster portion 6B supports the upper body of the seated occupant from the side. The bolster portion 6B protrudes further forward as it goes downward. In other words, the length of the bolster portion 6B in the front-to-rear direction increases as it goes downward. The length of the bolster portion 6B in the up-down direction is smaller than the length of the seatback central portion 6A in the up-down direction. Hereinafter, the bolster portion 6B connected to the left side of the seatback central portion 6A will be referred to as the left bolster portion 6C as appropriate.

[0044] The headrest 7 is connected to the upper end of the seat back 6 via two pillars 11 (see FIG. 2). The headrest 7 is disposed in a position behind the head of a seated occupant.

[0045] As shown in FIG. 2, the seat cushion 5 includes a metal frame (seat cushion frame 12, see FIG. 7) that forms a skeleton, a pad member 13 (see FIG. 1) supported by the seat cushion frame 12, and a skin material 14 (see FIG. 1) that covers the pad member 13. As shown in FIG. 6, the seat cushion frame 12 of the seat cushion 5 has a pair of left and right side frames 15 (cushion side frames) that extend in the front-rear direction, a front frame 16 (cross frame) that is hung between the front parts of the side frames 15, and a rear frame 17 (cross frame) that is hung between the rear parts of the side frames 15, forming a substantially rectangular frame shape. In this embodiment, the left and right side frames 15 of the seat cushion 5 are each formed in a plate shape having a surface facing in the left-right direction. The seat cushion frame 12 may further include a plate-shaped pan frame (not shown) that extends left and right between the pair of left and right side frames 15, and a wire member (not shown) that is hung between the front frame 16 and the rear frame 17. The pad member 13 of the seat cushion 5 is disposed on the upper side of the seat cushion frame 12. As shown in FIG.

[0046] The seat back 6 includes a metal frame (hereinafter, referred to as a seat back frame 22; see FIG. 7) that forms a skeleton in the same manner as the seat cushion 5, a pad member 23 (see FIG. 1) supported by the seat back frame 22, and a skin material 24 (see FIG. 1) that covers the pad member 23. The seat back frame 22 has a pair of left and right side frames 25 (back side frames) that extend vertically, an upper frame 26 that is suspended between the upper parts of the side frames 25, and a lower frame 27 that is suspended between the lower parts of the side frames 25, forming a substantially rectangular frame shape. A pressure receiving member 28 formed of a wire-like member is suspended between the left and right side frames 25. The pressure receiving member 28 is deflected by receiving a load from the occupant toward the rear, and supports the occupant's back from behind. The pad member 23 is disposed from the front side of the seat back frame 22 so as to cover the front surface and the left and right side surfaces of the seat back frame 22. The front surface and the left and right side surfaces of the pad member 23 are covered with the skin material 24.

[0047] The rear parts of the side frames 15 (cushion side frames) of the seat cushion 5 face each other on the left and right sides, sandwiching the lower parts of the two side frames 25 (back side frames) of the seat back 6. A tilt shaft 29 extending in the left-right direction (vehicle width direction) penetrates the lower parts of the left and right side frames 25 of the seat back 6 and the rear parts of the left and right side frames 15 of the seat cushion 5. The lower parts of the left and right side frames 25 of the seat back 6 are respectively connected to the rear parts of the corresponding side frames 15 of the seat cushion 5 so as to be rotatable around the tilt shaft 29 (see FIG. 1). More specifically, the seat back frame 22 and the seat cushion frame 12 are rotatably connected to each other by the tilt shaft 29, and the seat back frame 22 is tiltable (rotatable) around the tilt shaft 29 relative to the seat cushion frame 12.

[0048] As shown in FIG. 2, the rear of the left side frame 15 of the seat cushion 5 (hereinafter, left cushion side frame 15A) and the lower part of the left side frame 25 of the seat back 6 (hereinafter, left back side frame 25A) are connected to each other via a reclining mechanism 31. The reclining mechanism 31 is located at the vehicle outer end (left end) of the tilting shaft 29, and maintains the tilt (rotation) angle of each side frame 15 of the seat back 6 relative to each side frame 25 of the seat cushion 5 at an arbitrary position. In this embodiment, the reclining mechanism 31 includes a torsion coil spring 31A provided on the left side surface of the rear part of the left side frame 15 of the seat back 6. One end of the torsion coil spring 31A is connected to the left cushion side frame 15A, and the other end is connected to the left back side frame 25A. The torsion coil spring 31A biases the seat back frame 22 in a direction to tilt (rotate) the seat back frame 22 forward relative to the seat cushion frame 12.

[0049] When the backrest surface 10 is in the most upright position, i.e., when the backrest surface 10 is in the position closest to the vertical direction (see FIG. 1), the side frames 25 of the seat cushion 5 extend generally in the up-down direction. In the following, the description will be given based on the state when the backrest surface 10 is in the most upright position.

[0050] The reclining mechanism 31 includes an operating lever 32. The operating lever 32 is formed of a metal plate-shaped member and is disposed so as to extend in the front-rear direction along the left side surface of the left cushion side frame 15A. As shown in Fig. 1, a grip member 33 is provided at the front end of the operating lever 32.

[0051] When an occupant grasps the grip member 33 of the operating lever 32 and pushes it down, the vehicle seat 1 switches from a restricted state in which rotation of the seat back 6 relative to the seat cushion 5 is restricted to a released state in which rotation is permitted. When the occupant releases the operating lever 32, the operating lever 32 returns to the position before it was pushed down, and the vehicle seat 1 switches from the released state to the restricted state. This allows the occupant to adjust the reclining angle of the seat back 6 relative to the seat cushion 5 by operating the operating lever 32.

[0052] As shown in FIG. 7, a rail device 34 is provided between the vehicle seat 1 and the floor 3, which allows the vehicle seat 1 to slide in the front-rear direction relative to the floor 3. The rail device 34 includes a pair of left and right lower rails 36 fixed to the floor 3 and extending in the front-rear direction, and a pair of left and right upper rails 37 supported on the lower rails 36 so as to be slidable in the extending direction. The slide bar 38 is rod-shaped and extends left and right on the front lower side of the seat cushion 5. The seat cushion frame 12 of the seat cushion 5 is provided above the left and right upper rails 37, and the left and right upper rails 37 are connected to the seat cushion frame 12 of the seat cushion 5. The rail device 34 includes a lock mechanism that switches between a restricted state in which the upper rails 37 are restricted from sliding relative to the lower rails 36 and a released state in which the upper rails 37 are allowed to slide relative to the lower rails 36, depending on an operation input to the slide bar 38. An occupant can operate the slide bar 38 to switch between a state in which the seat cushion 5, the seat back 6, and the headrest 7 can slide back and forth together relative to the floor 3, and a restricted state in which the sliding movement is restricted.

[0053] 1, a side cover 55 is provided on the vehicle exterior side of the seat cushion 5. The side cover 55 is joined to the vehicle exterior side of the left cushion side frame 15A. The side cover 55 may be joined to the seat cushion frame 12, for example, by being hooked onto a wire member (not shown) welded to the left cushion side frame 15A.

[0054] The side cover 55 is a resin member and has a plate-shaped main body 56 having a surface facing the vehicle width direction, and a cylindrical portion 57 extending from the outer periphery of the main body 56 toward the inside of the vehicle. The main body 56 has a shape that generally matches the side of the seat cushion 5.

[0055] In this embodiment, a cover recess 58 recessed toward the vehicle interior is formed in the approximate center of the main body 56. A through hole 59 for inserting the operating lever 32 is provided in a wall that defines the rear edge of the cover recess 58 of the main body 56 and faces forward. The side cover 55 is disposed so that the operating lever 32 passes through the through hole 59 and is joined to the side frame 15. The operating lever 32 passes through the through hole 59 and extends forward, and the grip member 33 is located on the vehicle exterior side of the side cover 55.

[0056] 1, an airbag module 60 is provided on the side frame 15 on the vehicle exterior side of the seat back 6. The airbag module 60 is connected to the left side surface (the vehicle exterior side surface) of the left side frame 15 on the vehicle exterior side, approximately at the center in the up-down direction.

[0057] 4, the airbag module 60 is a module for deploying an airbag 71 (so-called side airbag) on ​​the vehicle exterior side of an occupant seated in the vehicle seat 1. The airbag module 60 includes an airbag 71 that deploys on the vehicle exterior side of the occupant, an inflator 72 that generates gas in the airbag 71 to inflate (deploy) the airbag 71, and a case 73 that houses the airbag 71 and the inflator 72.

[0058] The airbag 71 is a bag-shaped member, and is divided into a plurality of compartments. The divided compartments include a compartment 75A forming a shoulder protection part 74 that deploys on the outer side (left side) of the occupant's shoulders and a chest protection part 75 that deploys on the outer side (left side) of the occupant's chest by gas generated by an inflator 72, and a compartment 76A forming a waist protection part 76 that deploys on the outer side (left side) of the occupant's waist (see FIG. 6(B)). In this embodiment, the shoulder protection part 74 and the chest protection part 75 are formed by a single compartment 75A.

[0059] As shown in Fig. 4, the inflator 72 has a cylindrical main body 72A and a plurality of male screws 72B protruding radially outward from the main body 72A. As shown in Fig. 6(B), one end of the inflator 72 in the extending direction communicates with a chamber 75A forming the shoulder protection part 74 and the chest protection part 75 of the airbag 71, and the other end communicates directly with a chamber 76A forming the waist protection part 76 of the airbag 71 without going through another chamber.

[0060] As shown in FIG. 4, the case 73 is a box body having a substantially rectangular parallelepiped shape. The case 73 includes a bottomed rectangular cylindrical case body 73B having an opening 73A, and a resin-made lid member 73C covering the opening 73A of the case body 73B. A plurality of through holes 73D are formed in the bottom wall of the case body 73B to allow the male threads 72B of the inflator 72 to pass through. The lid member 73C is a substantially rectangular plate-like member, and is formed with a cleavage portion 73E that cleaves when the airbag 71 inflates. In this embodiment, the cleavage portion 73E is formed along the outer edge of one side of the lid member 73C as a portion having a smaller thickness than the other portions. A locking hole 73F is formed at the opening edge of the case body 73B, which penetrates in the thickness direction, and the lid member 73C is provided with a locking claw 73G that is hooked to the locking hole 73F. The airbag 71 is folded, and the inflator 72 is disposed so that the male screw 72B passes through the through hole 73D and protrudes from the case body 73B, and is housed inside the case body 73B. Furthermore, the locking claw 73G is hooked into the locking hole 73F, and the cover member 73C is joined to the case body 73B. The cover member 73C seals the opening 73A of the case body 73B.

[0061] The airbag module 60 is disposed along the outer side surface of the left side frame 15 of the seat back 6, with one end of the inflator 72 (the side communicating with the compartment 75A forming the shoulder protection section 74 and the chest protection section 75) on the upper side and the other end (the side communicating with the compartment 76A forming the waist protection section 76) on the lower side. The male screw 72B of the inflator 72 is fastened to the side frame 15, whereby the airbag module 60 is joined to the left side surface of the side frame 15. At this time, the cleavage section 73E of the cover member 73C is located near the left front edge of the case 73.

[0062] When the airbag 71 is deployed, as shown by the arrows in Figures 6(A) to (D), the inflator 72 releases gas from each of its ends (upper and lower ends) in the extension direction in opposite directions along the extension direction of the main body 72A. More specifically, the inflator 72 releases gas upward from the upper end. The gas released upward from the inflator 72 flows into individual chambers 75A forming the shoulder protection section 74 and the chest protection section 75. Furthermore, the inflator 72 releases gas downward from the lower end. The gas released downward from the inflator 72 flows directly into individual chamber 76A forming the waist protection section 76 without passing through other individual chambers.

[0063] As shown in Fig. 4, the pad member 23 covers the front side, left and right outer sides, and upper side of the seat back frame 22. The pad member 23 is provided on the front side of the seat back frame 22, and includes a front central portion 81A provided at a position corresponding to the backrest surface 10, and a left side portion 81B and a right side portion (not shown) located on the left and right sides of the front central portion 81A and each bulging forward. The front central portion 81A constitutes the seat back central portion 6A, and the left side portion 81B and the right side portion constitute the bolster portion 6B. Between the front central portion 81A and the left side portion 81B and between the front central portion 81A and the right side portion, there are provided thin-walled portions 83 having a smaller thickness than the front central portion 81A, the left side portion 81B, and the right side, respectively. That is, the front central portion 81A and the left side portion 81B, and the front central portion 81A and the right side portion are connected by thin portions 83, respectively, and the pad member 23 is easily bent and deformed at the thin portions 83 (see the dashed lines in FIG. 4).

[0064] The airbag module 60 is covered from the front, rear, top and bottom, and from the vehicle exterior side (left side) by the left side portion 81B. The left side portion 81B is provided with a slit 80 penetrating in the thickness direction at a position corresponding to the right end of the front edge of the airbag module 60. The slit 80 is provided on the left side surface of the left side portion 81B so as to extend vertically.

[0065] The surface of the pad member 23 is covered with a bag-shaped skin material 24. The skin material 24 includes a front skin material 85 that covers the front surface of the pad member 23, a left skin material 86 (outer skin material) that covers the left side surface of the pad member 23, a right skin material (not shown) that covers the right side surface of the pad member 23, and an upper skin material (not shown) that covers the upper surface of the pad member 23. In this embodiment, the skin material 24 includes a rear skin material 87 that connects the right skin material and the left skin material 86 on the left and right sides and covers the rear side of the seat back frame 22. The left side portion 81B is covered from above by the upper skin material, and from the front and rear, the outer side (left side), and the lower side by the left skin material 86.

[0066] The front skin material 85 and the left side skin material 86 are sewn together to form a seam 88. The seam 88 functions as a weak part that ruptures when a predetermined or greater load is applied from the inside of the seat back 6 by the inflated airbag 71. As shown in FIG. 1, the seam 88 extends vertically on the exterior side surface of the left side portion 81B. In this embodiment, the seam 88 reaches from the upper end to the lower end of the exterior side surface of the left side portion 81B. The seam 88 is located in front of the slit 80, near the front edge of the exterior side surface of the left side portion 81B.

[0067] A receiving recess 90 that is recessed toward the vehicle interior (right side) is formed on the vehicle exterior side (left side) of the left side portion 81B. In this embodiment, the receiving recess 90 is located in front of the slit 80. The receiving recess 90 extends vertically in a stripe shape at approximately the vertical center of the left side portion 81B. A clip 91 is provided in the receiving recess 90 (vehicle interior end). In this embodiment, the clip 91 is a resin member, and multiple clips 91 are accommodated in the receiving recess 90 so that they are lined up at equal intervals.

[0068] As shown in Figure 5, clip 91 has a flat bottom plate portion 91A, a protrusion portion 91B protruding from bottom plate portion 91A toward the outside of the vehicle, a pair of extension portions 91C that extend toward the outside of the vehicle in a front-to-rear pair from protrusion portion 91B, and a pair of locking claws 91D that protrude in opposite directions from each of the extending ends of extension portion 91C.

[0069] A hook 92 is connected to the clip 91. In this embodiment, the hook 92 is made of resin. The hook 92 has a flat plate portion 92A inserted between two locking claws 91D, and a pair of locking pieces 92B protruding in opposite directions from (the vehicle interior end) of the flat plate portion 92A. The bottom plate portion 91A abuts against a wall surface that defines the receiving recess 90 of the pad member 23, and is pressed against the wall from the front and rear directions. As a result, the clip 91 is received in the receiving recess 90 and locked to the pad member 23. The hook 92 is locked to the clip 91 by the engagement between the locking pieces 92B and the locking claws 91D, and is restricted from moving toward the vehicle exterior.

[0070] A webbing 93, which is a sheet-like member, is connected to the hook 92. One end of the webbing 93 is sewn to the flat plate portion 92A of the hook 92, and the other end is sewn to approximately the center in the up-down direction of the sewn portion 88 (see FIG. 6(A)).

[0071] As shown in Fig. 1, the rear of side cover 55 is located below bolster portion 6B on the vehicle exterior side (left side). An upwardly facing guide surface 96 is formed on the vehicle interior side edge (right edge) of the rear upper surface of side cover 55. As shown in Figs. 1 and 3(B), guide surface 96 is located below bolster portion 6B on the vehicle exterior side (left side), below airbag module 60, and is inclined downward toward the front. In other words, guide surface 96 is inclined upward from a point located below the lower front edge of airbag module 60 toward a point located below the lower rear edge of the lower end.

[0072] In this embodiment, as shown in Fig. 3(A), a guide wall 97 extending upward is provided on the outer side edge (left edge) of the guide surface 96. As a result, a step 98 is connected to the guide surface 96, the outer side of the vehicle being higher than the inner side of the vehicle. The guide wall 97 is positioned so that the airbag module 60 does not come into contact with the guide wall 97 when the seat back 6 is tilted. In this embodiment, the airbag module 60 is located farther from the tilt axis 29 than the upper edge of the guide wall 97. Furthermore, the guide surface 96 is gently curved upwardly convexly in a side view.

[0073] Next, the operation of the vehicle seat 1 thus configured will be described. When the airbag 71 is deployed, gas is introduced from the inflator 72 into the compartments 75A constituting the shoulder protection portion 74 and the chest protection portion 75, and into the compartment 76A constituting the waist protection portion 76. This causes the airbag 71 to inflate, and the case 73 to rupture at the rupture portion 73E.

[0074] As shown in Fig. 6(A), after the case 73 is torn open, gas is further introduced into the private chamber 76A constituting the lumbar protection part 76, causing the lumbar protection part 76 to expand downward. As shown in Fig. 6(B) , the expansion of the lumbar protection part 76 causes the left bolster part 6C to expand downward, and the lower surface of the left bolster part 6C comes into contact with the guide surface 96. Because the guide surface 96 is inclined downward toward the front, the downward expansion of the lumbar protection part 76 is restricted by the guide surface 96, and the expansion (deployment) of the lumbar protection part 76 is guided forward. This causes the lumbar protection part 76 to expand forward.

[0075] When the lumbar protection part 76 inflates forward, it passes through the slit 80 and reaches the skin 24. Thereafter, the lumbar protection part 76 inflates forward along the gap between the pad member 23 and the skin 24. As a result, as shown in Figures 6(C) and (D), a load is applied to the lower part of the seam 88 of the lumbar protection part 76, and the lower part of the seam 88 is torn, forming an opening in the skin 24 covering the lower part of the left side part 81B. As a result, the lumbar protection part 76 passes through the formed opening and inflates diagonally forward and left through the surface of the seat back 6, and deploys to the outside of the vehicle of the occupant's waist.

[0076] After the case 73 is torn open, gas is introduced into the compartment 75A constituting the shoulder protection part 74 and the chest protection part 75, as well as into the lumbar protection part 76. This causes the shoulder protection part 74 to inflate upward, as shown in Fig. 6(A). Furthermore, when the gas is introduced, the gas is guided forward by the edge of the compartment 75A that defines the shoulder protection part 74, causing the shoulder protection part 74 to inflate forward. The gas introduced into the compartment 75A may be configured to be guided forward by the skin material 24 covering the left side part 81B.

[0077] When the shoulder protection part 74 inflates forward, it passes through the slit 80 and reaches the skin 24. Thereafter, the shoulder protection part 74 inflates forward along the gap between the pad member 23 and the skin 24. As a result, as shown in FIG. 6(B), a load is applied to the upper part of the stitching 88 of the shoulder protection part 74, and the upper part of the stitching 88 is torn, forming an opening in the skin 24 covering the upper part of the left side part 81B. As a result, as shown in FIG. 6(C) and (D), the shoulder protection part 74 passes through the formed opening and inflates diagonally forward and left through the surface of the seat back 6, and deploys to the outside of the vehicle of the occupant's shoulder.

[0078] 6(C), when the shoulder protection part 74 inflates forward and the seam 88 starts to tear, gas also flows into the portion of the compartment 75A corresponding to the chest protection part 75. This causes the chest protection part 75 to inflate to the left, passing through the slit 80 and inflating forward along the gap between the skin 24 and the left side part 81B.

[0079] As can be seen from Fig. 4, when thorax protection part 75 inflates forward along between cover material 24 and left side portion 81B, thorax protection part 75 comes into contact with webbing 93. When thorax protection part 75 further inflates, a forward load is applied to webbing 93, and seam 88 ruptures. As a result, an opening is formed in the vertical center of the front left end of cover material 24 covering left side portion 81B. Thorax protection part 75 passes through the formed opening in cover material 24 and inflates diagonally forward and left of seat back 6, deploying to the outside of the vehicle against the occupant's chest.

[0080] At this time, an opening is formed in the skin material 24 covering the vertical center portion of the left side portion 81B, and when the chest protection portion 75 passes through the opening, the left side portion 81B is pushed forward and the pad member 23 is folded at the thin portion 83. The folding deformation of the pad member 23 increases the width of the slit 80 in the front-to-rear direction, so that the airbag 71 can easily pass through the slit 80 and the airbag 71 is deployed more quickly.

[0081] Next, the effects of the vehicle seat 1 thus configured will be described. When the gas discharged from the inflator 72 is introduced into the compartment 75A constituting the shoulder protection part 74 and the chest protection part 75, the shoulder protection part 74 inflates upward and then inflates forward. When the gas discharged from the inflator 72 is introduced into the compartment 76A constituting the lumbar protection part 76, the lumbar protection part 76 inflates downward and then inflates forward.

[0082] 1, in the vehicle seat 1, the left side portion 81B is formed so that the front-rear width increases downward. Therefore, the lumbar protection portion 76 is farther forward and rearward from the stitching portion 88 than the shoulder protection portion 74. Therefore, even if the lumbar protection portion 76 and the shoulder protection portion 74 each inflate forward at roughly the same rate, the deployment of the lumbar protection portion 76 out of the seat back 6 may be delayed relative to the shoulder protection portion 74.

[0083] In this embodiment, the side cover 55 is provided with a guide surface 96 that slopes downward toward the front. This allows the left bolster portion 6C to abut against the guide surface 96, and guides the lumbar protection portion 76 to inflate forward. This allows the lumbar protection portion 76 to inflate forward more quickly than when the guide surface 96 is not provided. This allows the airbag 71 to be deployed more quickly toward the outer side of the occupant's lumbar region on the outer side of the seat back 6, toward the vehicle exterior, than when the guide surface 96 is not provided.

[0084] In this embodiment, a guide wall 97 is provided on the outer edge of the guide surface 96, and a step 98 that raises the outer side of the vehicle is connected to it. By providing the step 98, the step 98 prevents the lumbar protection part 76 from expanding toward the outer side of the vehicle when the lumbar protection part 76 abuts against the guide surface 96. As a result, the deployment direction of the lumbar protection part 76 is more likely to be concentrated forward than in the case where the step 98 is not provided, so that the lumbar protection part 76 can be deployed toward the outer side of the vehicle of the occupant's waist more quickly.

[0085] Furthermore, the guide surface 96 is gently curved upwardly and convexly in a side view. This allows the guide surface 96 to withstand a larger load from above. This makes it difficult for the side cover 55 to deform during deployment, and allows the deployment of the lumbar protection part 76 to be guided more appropriately.

[0086] In this embodiment, a thin portion 83 is provided between the front central portion 81A and the left side portion 81B. By providing the thin portion 83, when the airbag 71 is deployed outside the seat back 6, the pad member 23 is bent and deformed at the thin portion 83, and the width of the slit 80 is expanded. This makes it easier for the airbag 71 to pass through the slit 80, so that the airbag 71 can be deployed more quickly.

[0087] <<Second embodiment>> The vehicle seat 101 according to the second embodiment differs from the first embodiment in that a support member 102 is provided on the side frame 15 on the vehicle exterior side (left side) of the seat back 6 and that a guide wall 97 is not provided on the side cover 55. Since the other configurations are the same as those of the first embodiment, a description thereof will be omitted. In the following description, the state when the backrest surface 10 is in the most upright state is used as a reference.

[0088] The support member 102 is a bent sheet metal member. The support member 102 is below the airbag module 60 and is connected to a lower end portion of the left backside frame 25A. The support member 102 includes an exterior joint portion 103A connected to the exterior side surface (left side surface) of the left backside frame 25A, a rear joint portion 103B connected to the rear side surface of the left backside frame 25A, and a support portion 104 connected to an upper edge of the exterior joint portion 103A.

[0089] The vehicle exterior coupling portion 103A has a flat plate shape. The vehicle exterior coupling portion 103A has a shape that fits to the vehicle exterior side surface of the lower end of the left back side frame 25A. A receiving hole 105 is formed in the approximate center of the vehicle exterior coupling portion 103A, penetrating in the thickness direction.

[0090] The rear joint portion 103B is a plate extending from the rear edge of the outer joint portion 103A toward the inner side (right side) of the vehicle. The rear joint portion 103B has a surface facing the front-rear direction. The left-right width of the rear joint portion 103B is shorter than the left-right width of the left back side frame 25A.

[0091] The exterior joint 103A is disposed so that the tilt axis 29 passes through the receiving hole 105 and is aligned along the exterior side surface of the left back side frame 25A. The rear joint 103B is disposed so as to be aligned along the rear surface of the left back side frame 25A. The front and lower edges of the exterior joint 103A and the interior edge (right edge) of the rear joint 103B are spot welded to the left back side frame 25A at multiple locations (hereinafter, welds 106). In this embodiment, the welds 106 are provided so as to surround the receiving hole 105 at the exterior joint 103A.

[0092] The support portion 104 is in the form of a plate extending from the upper edge of the outer joint portion 103A to the outside of the vehicle. A guide surface 104A is formed on the upper surface of the support portion 104, which is inclined downward toward the front. More specifically, the guide surface 104A is inclined downward toward the front when the backrest surface 10 is in the most upright state. In this embodiment, the guide surface 104A is gently curved upwardly convexly in a side view.

[0093] The side cover 55 is disposed so as to cover the lower half of the vehicle exterior joint portion 103A from the vehicle exterior. As in the first embodiment, the side cover 55 is joined to the left side surface (vehicle exterior side surface) of the left cushion side frame 15A. The upper half of the support member 102, including the support portion 104, is located above the side cover 55. The upper half of the support member 102, together with the airbag module 60, is stored inside the seat back 6 in a state where it is covered by the pad member 23 and the skin material 24 from the front and rear and from the vehicle exterior.

[0094] Next, the effect of the vehicle seat 101 according to the second embodiment will be described. When the airbag 71 is deployed, the lumbar protection part 76 inflates downward in the same manner as in the first embodiment. As a result, the lumbar protection part 76 reaches the support member 102 located at the lower end portion of the side frame 15.

[0095] At this time, the lumbar protection part 76 abuts against the guide surface 104A from above. Because the guide surface 104A is inclined downward toward the front, the lumbar protection part 76 is guided by the guide surface 104A to inflate forward. This allows the lumbar protection part 76 to inflate toward the front edge of the seat back 6 more quickly than in the case where the guide surface 104A is not provided. This allows the airbag 71 to reach the surface of the seat back 6 more quickly, and the airbag 71 to be deployed at a higher speed to a position corresponding to the occupant's lumbar region.

[0096] Furthermore, since the guide surface 104A is curved convexly upward, the airbag 71 is less likely to come into contact with the edge of the support portion 104 during deployment. This makes it possible to prevent the airbag 71 from coming into contact with the leading edge or trailing edge of the support portion 104 during deployment. In this way, by preventing contact between the airbag 71 and the leading edge or trailing edge of the support portion 104, the airbag 71 can be deployed more appropriately.

[0097] Furthermore, since the guide surface 104A can be formed by the support member 102, which is a sheet metal member, the guide surface 104A can be formed by a simple structure.

[0098] Furthermore, a receiving hole 105 is provided in the vehicle exterior connecting portion 103A of the support member 102, and the tilt shaft 29 is received in the receiving hole 105. This allows the support member 102 to be connected to the side frame 15 of the seat back 6 without interfering with the tilt shaft 29. Furthermore, the vehicle exterior connecting portion 103A is welded to the side frame 15 at a welding portion 106 provided so as to surround the receiving hole 105. This allows the rigidity of the seat back frame 22 in the vicinity of the tilt shaft 29, which is a movable portion that is likely to receive a load during a collision, to be increased and reinforced.

[0099] When a load is applied to the vehicle seat 1 from the back due to a collision or the like, the load is likely to be applied to the joint between the side frame 15 and the lower frame 27 and the joint between the side frame 15 and the upper frame 26. In this embodiment, the rear joint 103B is welded to the vicinity of the lower edge of the rear surface of the side frame 15, thereby increasing the rigidity of the vicinity of the joint between the side frame 15 and the lower frame 27. This makes it possible to reinforce the portion that is likely to be subjected to a load in the event of a collision. In addition, by arranging the vehicle exterior joint 103A and the rear joint 103B so as to be perpendicular to each other, the rigidity of the support member 102 itself can be increased.

[0100] <<Third embodiment>> The vehicle seat 201 according to the third embodiment differs from the vehicle seat 1 according to the first embodiment in that a support member 202 is provided. The support member 202 provided in the vehicle seat 201 according to the third embodiment is different from the support member 102 of the vehicle seat 101 according to the second embodiment. Other configurations are similar to those of the vehicle seat 1 according to the first embodiment, and therefore descriptions thereof will be omitted. Also, as in the first and second embodiments, the description will be given based on the state when the backrest surface 10 is in the most upright state.

[0101] A support member 202 of a vehicle seat 201 according to the third embodiment is a bent sheet metal member. The support member 202 is below the airbag module 60 and is joined to a lower end portion of the side frame 15 on the vehicle exterior side. The support member 202 includes an exterior joint portion 203A joined to the vehicle exterior side surface of the side frame 15, a rear joint portion 203B joined to the rear side surface of the side frame 15, and a support portion 204 connected to an upper edge of the exterior joint portion 203A.

[0102] The vehicle exterior coupling portion 203A has a flat plate shape. The vehicle exterior coupling portion 203A has a shape that fits to the vehicle exterior side surface of the lower end of the left back side frame 25A. A receiving hole 205 that penetrates the vehicle exterior coupling portion 203A in the thickness direction is formed in approximately the center of the vehicle exterior coupling portion 203A.

[0103] The rear joint portion 203B is a plate extending from the rear edge of the outer joint portion 203A toward the inner side of the vehicle. The rear joint portion 203B has a surface facing the front-rear direction. The width of the rear joint portion 203B in the left-right direction is shorter than the width of the left back side frame 25A in the left-right direction.

[0104] The exterior joint 203A is disposed so that the tilt axis 29 passes through the receiving hole 205 and is aligned along the exterior side surface of the left back side frame 25A. The rear joint 203B is disposed so as to be aligned along the rear surface of the left back side frame 25A. The exterior edge of the exterior joint 203A and the interior edge of the rear joint 203B are spot welded to the left back side frame 25A at a plurality of locations (hereinafter, welds 206). In this embodiment, the welds 206 are provided so as to surround the receiving hole 205 at the exterior joint 203A.

[0105] The support portion 204 is in the form of a plate extending from an upper edge of the outer joint portion 203A to the outer side of the vehicle. A support surface 207 is formed on the upper surface of the support portion 204, which is inclined downward toward the front. More specifically, the support surface 207 is inclined downward toward the front when the backrest surface 10 is in the most upright state. In this embodiment, the support surface 207 is gently curved upwardly and convexly in a side view, and has a shape corresponding to the guide surface 96 of the side cover 55.

[0106] 9, the side cover 55 is disposed so as to cover the entire support member 202 from the outer side of the vehicle, and is joined to the side frame 15 of the seat cushion 5. The support surface 207 abuts from below on a portion of the side cover 55 that corresponds to the guide surface 96, and supports the guide surface 96 from below.

[0107] Next, the effects of vehicle seat 201 according to the third embodiment will be described. When airbag 71 deploys, lumbar protection portion 76 inflates downward as in the first embodiment, and left bolster portion 6C inflates downward due to the inflation of lumbar protection portion 76, and the lower surface of left bolster portion 6C abuts against guide surface 96. At this time, a load is applied to guide surface 96 in a downward direction from left bolster portion 6C.

[0108] Since the support surface 207 abuts from below against the portion of the side cover 55 that corresponds to the guide surface 96, the support surface 207 is supported from below by the support member 202. This prevents deformation of the portion of the side cover 55 that corresponds to the guide surface 96. Therefore, the deployment direction of the lumbar protection part 76 can be guided in a more appropriate direction, so that the lumbar protection part 76 can be deployed more quickly to the outside of the seat back 6, and the occupant can be protected more reliably.

[0109] Although the description of the specific embodiment is finished above, the present invention is not limited to the above embodiment and can be widely modified. As shown in Fig. 10, the protruding amount of the locking claw 91D located at the front may be smaller than the protruding amount of the locking claw 91D located at the rear. When the airbag 71 is inflated, a load in the forward direction is applied to the webbing 93, so that the locking claw 91D located at the rear and the locking piece 92B mainly engage with each other, and the hook 92 can be prevented from coming off the clip 91. In addition, by making the protruding amount of the locking claw 91D located at the front smaller than that of the locking claw 91D located at the rear, the worker can easily connect the hook 92 to the clip 91 when assembling the vehicle seat 1, 101, 201, compared to when the protruding amount of the locking claw 91D located at the front is the same as that of the locking claw 91D located at the rear.

[0110] In the first to third embodiments, the airbag module 60 is fastened to the side frame 25 of the seat back 6, but the present invention is not limited to this. As shown in FIG. 11, the airbag module 60 may be coupled to the side frame 25 of the seat back 6 via a bracket 210. For example, the bracket 210 may be a sheet metal member bent to form a U-shape opening forward in a top view, and the airbag module 60 may be inserted from the front into the opening of the bracket 210, so as to be sandwiched by the bracket 210 and coupled to the side frame 25. The bracket 210 may be formed with a notch 211 having a predetermined shape, and the airbag module 60 may be provided with a hook 212 that is hooked to the notch 211.

[0111] In the first to third embodiments, the clip 91 is accommodated in the receiving recess 90 provided on the vehicle exterior side surface of the pad member 23, but the present invention is not limited to this embodiment. The recess 222 in which the clip 91 is received may be formed in the front surface of the left side portion 81B on the vehicle exterior side (right side) of the pad member 23 so as to be recessed rearward, as shown in FIG. 12. In this case as well, the chest protection portion 75 passes through the slit 80, and inflates forward through the gap between the pad member 23 and the left side skin material 86 and between the pad member 23 and the front side skin material 85. As a result, the chest protection portion 75 comes into contact with the webbing 93, and a load directed forward is applied to the webbing 93, causing the seam 88 to rupture. As a result, an opening is formed in the vertical center portion of the front left end of the skin material 24 covering the left side portion 81B, and the chest protection portion 75 is deployed outside the seat back 6.

[0112] 13, a clip 291 for hanging a hook 92 connected to a webbing 93 may be directly connected to the seat back frame 22. The clip 291 may have an opening toward the exterior side or forward of the vehicle and may be provided with a receiving hole 292 for receiving the hook 92.

[0113] In the first embodiment described above, the step 98 is connected to the guide surface 96, but the present invention is not limited to this. For example, as shown in Fig. 14, the guide surface 296 may be a slope that is inclined so that the outer side of the vehicle is higher. By raising the outer side of the guide surface 296, the lumbar protection part 76 is guided to the inner side of the vehicle (right side), so that the lumbar protection part 76 deploys forward more quickly.

[0114] In the third embodiment, the support portion 204 of the support member 202 may be configured so that one end of the torsion coil spring 31A is hooked.

[0115] In the above embodiment, the vehicle seat 1, 101, 201 constitutes a passenger seat, but is not limited to this. For example, the vehicle seat 1, 101, 201 may constitute a rear seat arranged in the second row or later. [Explanation of symbols]

[0116] 1: Vehicle seat according to the first embodiment 5: Seat cushion 6: Seat back 12: Seat cushion frame 15: Side frame (cushion side frame) 22: Seat back frame 28:Tilt axis 15: Side frame (back side frame) 55: Side cover 60: Airbag module 71: Airbag 76: Waist protection part 96: Guide surface 98: Step 101: Vehicle seat according to the second embodiment 102: Support member 103A: Vehicle outside joint part 103B: Posterior joint 104: Support part 104A: Guide surface 105: Receptor hole 106: Welded parts 201: Vehicle seat according to the third embodiment 202: Support member

Claims

[Claim 1] a seat cushion including a seat cushion frame; a seat back including a seat back frame connected to a rear portion of the seat cushion frame, an airbag module coupled to a side surface of the seat back frame facing an exterior side of the vehicle, a pad member supported by the seat back frame, and a skin material covering a front surface of the pad member, a webbing having one end to which the skin is sewn is provided between the skin and the pad member; A first recess is provided on the front surface of the pad member, the first recess being a thin portion for facilitating deformation, and a second recess is provided on the seat outer side in the left-right direction of the first recess, the second recess being recessed rearward and accommodating a clip for engaging the other end of the webbing. A vehicle seat, wherein a front-rear thickness of the pad member at a portion where the first recess is provided is smaller than a front-rear thickness of the pad member at a portion where the second recess is provided.

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