JP7001913B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat equipped with a rear-deploying airbag.

A seat for an automobile provided with an airbag unit deployed rearward at the rear of the seat back is known. The automobile seat according to Patent Document 1 is provided on the back surface of the seat back, is supported by a plate-shaped seat back garnish having an opening, and is supported by the seat back frame, and is supported on the outside of the seat back garnish through the opening. It has a protruding airbag unit.

Japanese Unexamined Patent Publication No. 6-278512

However, the above-mentioned seat has a problem that a gap is likely to occur between the seat back garnish and the airbag unit. Further, when a flexible skin material such as a woven fabric or leather is used instead of the seat back garnish, it is more difficult to eliminate the gap between the skin material and the airbag unit. If a gap is created, the aesthetic appearance may be impaired and the operation of the airbag unit may be hindered by the presence of foreign matter or the like.

In view of the above background, it is an object of the present invention to eliminate the gap between the airbag unit deployed rearward and the skin material in the vehicle seat.

In order to solve the above problems, one aspect of the present invention is a vehicle seat (1) having a seat cushion (3) and a seat back (4), and a pair of left and right side frames (11) extending vertically are provided. A seat back frame (6) including, a holder (22) extending to the left and right and bonded to the corresponding side frame at both left and right ends, and an airbag unit (21) received by the holder and deployed rearward. The holder has a skin material (8) which forms an outer surface of the seat back and has an opening (61) for exposing the airbag unit to the rear, and the holder has a recess (28) which is opened toward the rear. The airbag unit has a holder body (29) for defining the above and a flange (31) provided on the edge of the recess in the holder body, and the airbag unit is arranged in the recess and opens rearward. It has a case (41), a lid (42) facing the flange at an edge, and an inflator (43) and an airbag (44) provided in the case while closing the open end of the case. The edge of the opening of the skin material passes between the flange and the lid, extends into the recess, and is locked to the holder body.

According to this aspect, since the edge of the skin material extends inside the holder covered with the lid, it is possible to prevent a gap from being formed between the skin material and the airbag unit when viewed from the rear. Can be done.

Further, in the above aspect, it is preferable that the holder has at least one reinforcing member provided on the flange, the holder body and the flange are formed of resin, and the reinforcing member is formed of metal.

According to this aspect, since the deformation of the flange can be suppressed by the reinforcing member, the spread between the flange and the lid can be suppressed. As a result, it is possible to suppress the entry of foreign matter between the flange and the lid. Further, since the rigidity of the holder is improved by the reinforcing member, the airbag unit can be stably supported by the side frame via the holder.

Further, in the above aspect, the reinforcing member may be a plate-shaped member and may be arranged inside the flange.

According to this aspect, the reinforcing member can be stably connected to the flange.

Further, in the above aspect, the reinforcing member may be formed in a corrugated shape.

According to this aspect, the rigidity of the reinforcing member can be improved, and the weight of the holder can be reduced.

Further, in the above embodiment, the holder extends along the boundary between the bottom wall, the upper wall, the left and right side walls, and the lower wall defining the recess, and the boundary between the upper wall and the left and right side walls, respectively. It is preferable that the reinforcing member has a pair of left and right holder fragile portions extending to the outer peripheral edge of the flange and split by the expansion pressure of the airbag, and the reinforcing member is arranged so as to avoid the holder fragile portion.

According to this aspect, the reinforcing member can be arranged so as not to hinder the deployment of the airbag.

Further, in the above aspect, the holder fragile portion may have at least one of a plurality of through holes and a plurality of thin-walled portions thin with respect to the side wall.

According to this aspect, the holder fragile portion can be formed with a simple configuration.

Further, in the above aspect, it is preferable that the flange has an insertion hole through which a bolt for fastening the holder to the side frame passes, and the reinforcing member is arranged so as to avoid the insertion hole.

According to this aspect, the holder can be fastened to the side frame by bolts at the flange.

Further, in the above aspect, it is preferable that one of the reinforcing members is provided below the recess in the flange and extends from one side frame to the other side frame.

According to this aspect, the holder can be stably supported by the left and right side frames by the reinforcing member.

Further, in the above aspect, the reinforcing member provided below the recess in the flange may be located behind the corresponding side frame at both ends.

According to this aspect, the forward reaction force generated by the deployment of the airbag can be supported by the side frame via the reinforcing member.

Further, in the above aspect, the lid is swingably coupled to the lower edge of the open end of the case and splits to the upper edge and the left and right side edges of the open end of the case by the expansion pressure of the airbag. It is good to be connected via the case vulnerable part.

According to this aspect, the airbag can be deployed upward and backward.

According to one aspect of the present invention, since the edge of the skin material extends inside the holder covered with the lid, a gap is formed between the skin material and the airbag unit when viewed from the rear. Can be prevented.

According to the embodiment in which the reinforcing member is provided on the flange, the reinforcing member suppresses the deformation of the flange, so that the spread between the flange and the lid can be suppressed. As a result, it is possible to suppress the entry of foreign matter between the flange and the lid. Further, since the rigidity of the holder is improved by the reinforcing member, the airbag unit can be stably supported by the side frame via the holder.

According to the embodiment in which the reinforcing member is arranged inside the flange, the reinforcing member can be stably connected to the flange.

According to the embodiment in which the reinforcing member is formed in a corrugated manner, the rigidity of the reinforcing member can be improved, so that the weight of the holder can be reduced.

According to the embodiment in which the reinforcing member is arranged so as to avoid the fragile portion of the holder, the reinforcing member can be arranged so as not to hinder the deployment of the airbag.

According to the embodiment in which the holder fragile portion has a plurality of through holes and thin-walled portions, the holder fragile portion can be formed with a simple configuration.

According to the embodiment in which the reinforcing member is arranged avoiding the bolt holes, the holder can be fastened to the side frame by bolts at the flange.

According to the embodiment in which one of the reinforcing members extends from one side frame to the other side frame, the reinforcing member can stably support the holder on the left and right side frames.

Reinforcing members provided below the recesses in the flange are located behind the corresponding sideframes at both ends to support the forward reaction force generated by the deployment of the airbag to the sideframes via the reinforcing members. Can be made to.

The lid is swingably coupled to the lower edge of the open end of the case and to the upper edge and the left and right side edges of the open end of the case via a case fragile portion that is torn by the expansion pressure of the airbag. According to this, the airbag can be deployed upward and backward.

It is a side view of the sheet which concerns on embodiment, and is the figure which shows the state which the airbag is deployed. Rear view of the sheet according to the embodiment Rear view of seat back frame and airbag unit (rear view of seat without skin and pads) An exploded perspective view of the airbag unit and holder Perspective view of retainer Perspective view of wall member Perspective view of the support plate and locking part of the side frame VIII-VIII sectional view of FIG. IX-IX sectional view of FIG. Cross-sectional view of the airbag unit and holder when the airbag is deployed

Hereinafter, an embodiment in which the vehicle seat according to the present invention is applied to the front seat of an automobile will be described with reference to the drawings.

As shown in FIG. 1, the seat 1 according to the present invention is provided in the front row of an automobile. The seat 1 includes a seat cushion 3 provided on the floor of an automobile via a slide rail 2, a seat back 4 rotatably supported at the rear of the seat cushion 3, and a headrest provided on the upper part of the seat back 4. Has 5 and.

As shown in FIGS. 2 and 3, the seat back 4 is provided on the surface of the seat back frame 6, the pad member 7 supported by the seat back frame 6 (see FIG. 8), and the pad member 7, and the seat back is provided. It has a skin material 8 constituting the outer surface of 4.

The seat back frame 6 has a pair of left and right side frames 11 extending vertically, an upper frame 12 extending left and right and joining to the upper ends of the left and right side frames 11, and a pair of left and right side frames 11 extending left and right and joining to the lower part of the left and right side frames 11. It has a lower frame 13 and a cross frame 14 extending left and right between the upper frame 12 and the lower frame 13 and connecting to the left and right side frames 11.

The upper part of each side frame 11 and the upper frame 12 are formed by bending one pipe material 16. The pipe material 16 has an intermediate portion extending to the left and right to form the upper frame 12, and left and right end portions extending downward to form the upper portion of the left and right side frames 11. The lower portion of each side frame 11 is formed by a sheet metal member 17, and is welded to the left and right ends of the pipe member 16 at the upper end. Each side frame 11 is rotatably coupled to the rear end of a seat cushion frame (not shown) forming the skeleton of the seat cushion 3 at its lower end.

A pair of left and right pillar support brackets 19 are coupled to the front surface of the upper frame 12. Each pillar support bracket 19 is formed in a tubular shape and extends vertically. A pillar support member (not shown) that supports the pillars of the headrest 5 is inserted into the pillar support bracket 19.

The airbag unit 21 and the holder 22 for supporting the airbag unit 21 are coupled to the left and right side frames 11. Specifically, the airbag unit 21 and the holder 22 are coupled to the support plate 23 and the holder locking portion 24 provided on the left and right side frames 11, respectively.

As shown in FIGS. 3 and 7, the left and right support plates 23 are provided on the trailing edges of the left and right side frames 11 and project in a direction approaching each other. Each support plate 23 has a surface facing the front and back. The support plate 23 is composed of an edge portion of a sheet metal member 17 that constitutes the lower portion of the side frame 11. In another embodiment, the support plate 23 may be a plate material coupled to the pipe material 16 or the sheet metal member 17.

The left and right holder locking portions 24 are provided above the support plates 23 in the inner portions of the left and right side frames 11. Each holder locking portion 24 is formed by the edge portion of the sheet metal member 17, and has a rear plate 24A extending in a direction approaching each other from each side frame 11 and a side plate 24B extending forward from the protruding end of each rear plate 24A. Have. The surface of the rear plate 24A faces the front and back, and the surface of the side plate 24B faces the left and right.

A pin locking hole 25 is formed in each holder locking portion 24. The pin locking hole 25 has a vertical hole portion 25A and a horizontal hole portion 25B, and has an L-shape when viewed from the left-right direction. The vertical hole portion 25A penetrates the side plate 24B in the thickness direction and extends vertically. The lateral hole portion 25B penetrates the side plate 24B in the thickness direction, extends rearward from the lower end of the vertical hole portion 25A, penetrates the rear plate 24A, and opens rearward. The open end of the lateral hole portion 25B in the rear plate 24A is formed so that the vertical width on the side plate 24B side is narrower than the vertical width on the side opposite to the side plate 24B side. The pin locking hole 25 is a hole having a depth on the left and right outwards.

As shown in FIG. 4, the holder 22 has a holder body 29 that defines a recess 28 that opens rearward. The holder 22 is formed in a substantially rectangular parallelepiped box shape, and has a holder bottom wall 29A (front wall) (see FIG. 8) that defines the bottom (front) of the recess 28 and a holder upper wall 29B that defines the top of the recess 28. And left and right holder side walls 29C defining the left and right side portions of the recess 28, and a holder lower wall 29D defining the lower portion of the recess 28. The holder 22 extends to the left and right.

The holder 22 has a flange 31 provided on the opening edge of the recess 28 of the holder body 29. The flange 31 extends along the opening edge of the recess 28 (the trailing edge of the holder body 29) and is formed in a frame shape. The flange 31 has an upper side portion 31A extending left and right along the holder upper wall 29B, left and right side side portions 31B extending vertically along the left and right holder side wall 29C, and a lower side portion extending left and right along the holder lower wall 29D. It has 31C and. The flange 31 is formed in a plate shape and has a surface facing rearward. The holder body 29 and the flange 31 are integrally formed of resin.

The holder 22 has at least one reinforcing member 32 provided on the flange 31. In the present embodiment, the reinforcing member 32 is formed of a metal plate-shaped member, and a plurality of the reinforcing members 32 are provided. Each reinforcing member 32 is arranged inside the flange 31. The flange 31 may be formed by insert molding so as to include the reinforcing member 32 inside. Each reinforcing member 32 is arranged in parallel with the flange 31, and the surface faces the front and back.

In the present embodiment, the reinforcing member 32 is formed of four linearly extending plate pieces, and is arranged on each of the upper side portion 31A, the left and right side side portions 31B, and the lower side portion 31C. The reinforcing members 32 are arranged apart from each other and avoid the four corners of the flange 31. That is, each reinforcing member 32 has left and right end portions of the lower side portion 31C (connection portions between the lower side portion 31C and the left and right side side portions 31B) and left and right end portions of the upper side portion 31A (upper side portion 31A and left and right side sides). It is arranged in a portion other than the connection portion) with the portion 31B.

Flange-side insertion holes 34 penetrating in the thickness direction are formed at both left and right ends of the lower side portion 31C, that is, at each of the connecting portions with the left and right side side portions 31B.

The holder 22 extends back and forth along each of the boundaries between the holder upper wall 29B and the left and right holder side walls 29C, and the left and right holder fragile portions 35 that pass through both ends of the upper side portion 31A and extend to the outer peripheral edge of the flange 31. Have. Each holder fragile portion 35 is formed to have a lower tensile strength than the other portions of the holder 22. Each holder fragile portion 35 may be a thin portion having a thinner wall thickness than the other portions of the holder 22. Further, each holder fragile portion 35 may have a groove or a plurality of intermittently arranged through holes. In the flange 31, each holder fragile portion 35 extends through between adjacent reinforcing members 32. That is, each reinforcing member 32 is arranged so as to avoid each holder fragile portion 35.

As shown in FIGS. 4 to 6 and 8, the airbag unit 21 is arranged in the recess 28 and opens toward the rear, the case 41, the lid 42 that closes the open end of the case 41, and the inside of the case 41. It has an inflator 43 and an airbag 44 provided in the above. The case 41 has a retainer 46 formed of a metal plate and a flexible wall member 47 formed of resin and coupled to the retainer 46.

As shown in FIG. 5, the retainer 46 includes a retainer front plate 46A whose surface faces forward and backward, a retainer lower plate 46B which extends rearward from the lower edge of the retainer front plate 46A and whose surface faces up and down, and a retainer front plate 46A. It has left and right retainer side plates 46C extending rearward from the left and right side edges and facing left and right, and a fastening plate 46D extending downward from the trailing edge of the retainer lower plate 46B and facing front and back. The retainer 46 is formed by bending a metal plate.

As shown in FIG. 6, the wall member 47 is formed in a square cylinder shape that opens in the front-rear direction, and has a case upper wall 47A, left and right case side walls 47B, and a case lower wall 47C. Each of the left and right case side walls 47B is arranged along the inner side surface of the corresponding left and right retainer side plates 46C, and the case lower wall 47C is arranged along the upper surface of the retainer lower plate 46B.

As shown in FIGS. 4 and 8, a plurality of hooks 49 formed on each of the case upper wall 47A, the left and right case side walls 47B, and the case lower wall 47C are formed on the left and right retainer side plates 46C, the retainer lower plate 46B, and the case lower wall 47C. The retainer 46 and the wall member 47 are coupled to each other by being locked in a plurality of locking holes 51 formed in each of the retainer front plates 46A. The retainer 46 and the wall member 47 cooperate to form a box shape that opens toward the rear.

As shown in FIG. 5, pins 53 are projected from each of the upper portions of the outer surfaces of the left and right retainer side plates 46C substantially perpendicular to the retainer side plates 46C. The left and right pins 53 are formed in a columnar shape and are arranged coaxially with each other. A disk-shaped locking piece 53A is coaxially provided at the tip of each pin 53.

At both left and right ends of the fastening plate 46D, bulging portions 55 bulging toward the front are formed. Each bulging portion 55 is formed in a cylindrical shape, and the back side (rear side) thereof is recessed forward. As shown in FIG. 9, the protruding end of each bulging portion 55 is formed on a flat surface, and each protruding end is formed with a first bolt hole 56 penetrating in the thickness direction.

As shown in FIG. 6, the lid 42 has a plate shape with its surface facing forward and backward, and is connected to the rear end of the wall member 47 on the front surface. The trailing edge of the case lower wall 47C and the lid 42 are swingably coupled to each other. The trailing edges of the case upper wall 47A and the left and right case side walls 47B and the lid 42 are connected via the first case fragile portion 57. The first case fragile portion 57 is formed to have a lower tensile strength than any of the wall member 47 and the lid 42.

In this embodiment, the wall member 47 and the lid 42 are integrally molded with resin. The fragile portion 57 of the first case may be a thin portion having a thickness thinner than that of the wall member 47 and the lid 42. Further, the first case fragile portion 57 may have a groove or a plurality of intermittently arranged through holes. In order to allow the lid 42 to swing with respect to the case lower wall 47C, it is preferable that the boundary portion between the trailing edge of the case lower wall 47C and the lid 42 is formed thin with respect to other portions.

A second case fragile portion 58 extending back and forth and reaching the trailing edge of the case upper wall 47A is formed at both left and right ends of the case upper wall 47A. Each second case fragile portion 58 preferably extends to the leading edge of the case upper wall 47A. The second case fragile portion 58 is formed to have a lower tensile strength than any of the wall member 47 and the lid 42. The second case fragile portion 58 is preferably a thin portion having a thickness thinner than that of the case upper wall 47A and the left and right case side walls 47B. Further, the second case fragile portion 58 may have a groove or a plurality of intermittently arranged through holes.

The outer peripheral portion of the lid 42 extends outward from the wall member 47. As shown in FIG. 8, the lower edge portion of the lid 42 is arranged at a position facing the fastening plate 46D. As shown in FIG. 6, the lower edge portion of the lid 42 has a notch 59 at a position facing the left and right bulging portions 55.

As shown in FIG. 8, the inflator 43 is a device that generates gas for inflating the airbag 44, and has a tubular outer shape. The inflator 43 is arranged at the lower part of the case 41 so as to extend left and right. The inflator 43 is fastened to the case lower wall 47C of the retainer 46 by bolts.

The airbag 44 is a bag body and is connected to the inflator 43. The airbag 44 is formed in an arc shape that is convex upward when deployed, is connected to the inflator 43 at the base end, and the tip is located rearward with respect to the inflator 43. In the initial state, the airbag 44 is folded and placed above the inflator 43 in the case 41. After the inflator 43 and the airbag 44 are arranged in the retainer 46, the wall member 47 integrated with the lid 42 is attached to the retainer 46, so that the inflator 43 and the airbag 44 are provided inside the case 41.

The skin material 8 forms the back surface of the seat back 4, and has an opening 61 for exposing the airbag unit 21 to the rear in the portion forming the back surface. The opening 61 is formed in a rectangular shape that is long to the left and right corresponding to the recess 28. The opening 61 is formed smaller than the open end of the recess 28, and has slits at the boundaries of the upper edge, the left and right side edges, and the lower edges. A hook 62 is joined to the upper edge, the left and right side edges, and the lower edge of the opening 61 by sewing or the like. Each of the holder upper wall 29B, the left and right holder side walls 29C, and the holder lower wall 29D of the holder 22 is formed with a skin hooking hole 64 penetrating in the thickness direction. The upper edge, the left and right side edges, and the lower edge of the opening 61 extend into the recess 28 and are hooked to the corresponding skin hook hole 64 by the hook 62. The skin material 8 has a through hole 65 at a position facing the flange side insertion hole 34.

As shown in FIG. 4, the left and right holder side walls 29C of the holder 22 are formed with pin insertion holes 66 penetrating in the thickness direction. In a state where the case 41 is received by the recess 28, the left and right pins 53 penetrate the corresponding left and right pin insertion holes 66 and project to the left and right sides of the holder side wall 29C. When the skin material 8 is present at a position facing the pin insertion hole 66, it is preferable that the skin material 8 also has a through hole through which the pin 53 can pass. Further, the elastic claw 67 projecting from the upper surface of the case upper wall 47A is formed in the locking hole 68 formed on the lower surface of the holder upper wall 29B. The pin 53 is inserted into the pin insertion hole 66, and the elastic claw 67 is locked in the locking hole 68, so that the airbag unit 21 and the holder 22 are temporarily fixed to each other. In this state, the edge portion of the lid 42 and the fastening plate 46D face the flange 31 via the skin material 8, and the left and right bulging portions 55 of the fastening plate 46D plunge into the corresponding flange-side insertion holes 34.

As shown in FIG. 7, the left and right pins 53 are received by the vertical hole portions 25A of the corresponding left and right pin locking holes 25. As a result, the left and right pins 53 and the airbag unit 21 are restricted from moving in the front-rear direction.

As shown in FIG. 9, in a state where the left and right pins 53 are received by the vertical hole portion 25A of the corresponding pin locking hole 25, the protruding ends of the left and right bulging portions 55 are the support plates of the left and right side frames 11. It is in contact with the rear surface of 23. Each support plate 23 has a second bolt hole 71 penetrating in the thickness direction at a position facing the first bolt hole 56 of the corresponding bulging portion 55. A weld nut 72 is welded to the front surface of each support plate 23 at a position corresponding to the second bolt hole 71.

The first bolt 74 (first fastening member) passes through the first bolt hole 56 on the left side and the second bolt hole 71 on the left side and is screwed into the weld nut 72 on the left side, so that the left end of the fastening plate 46D is on the left side. It is fastened to the support plate 23. The second bolt 75 (second fastening member) passes through the first bolt hole 56 on the right side and the second bolt hole 71 on the right side and is screwed into the weld nut 72 on the left side, so that the right end of the fastening plate 46D is on the left and right sides. It is fastened to the support plate 23 of. The flange 31 is sandwiched between the left end of the fastening plate 46D and the left support plate 23 at the left end, and is sandwiched between the right end and the right support plate 23 of the fastening plate 46D at the right end. In this way, the case 41 and the holder 22 are co-fastened to the left side frame 11 by the first bolt 74 and to the right side frame 11 by the second bolt 75.

When the airbag unit 21 and the holder 22 are fastened to the left and right support plates 23 by the first bolt 74 and the second bolt 75, the left and right pins 53 cannot move up and down in the vertical hole portion 25A. It cannot be separated from the vertical hole portion 25A. In this state, the left and right pins 53 are restricted from moving back and forth by abutting on the front and rear edges of the vertical hole portion 25A. Further, the locking piece 53A provided at the tip of each pin 53 abuts on the front and rear edges of the corresponding vertical hole portion 25A from the left and right outside, thereby restricting the movement of the pin 53 in the left-right direction. As described above, the airbag unit 21 and the holder 22 are locked by the left and right fastening portions by the first bolt 74 and the second bolt 75, and the pins 53 and the pin locking holes 25 arranged above the left and right fastening portions. Due to the structure, it is supported by the left and right side frames 11 with good stability.

When the airbag unit 21 and the holder 22 are attached to the left and right side frames 11, the reinforcing member 32 provided on the lower side portion 31C has the left end located behind the left support plate 23 and the right end for the right support. It is located behind the plate 23. That is, when viewed from the rear, the reinforcing member 32 provided on the lower side portion 31C extends from the rear of the left support plate 23 to the rear of the right support plate 23.

When attaching the holder 22 and the airbag unit 21 to the seat back frame 6, the holder 22 is first arranged inside the skin material 8 mounted on the seat back frame 6, and the holder 22 has the edge of the opening 61 of the skin material 8. Hang the part. Next, the airbag unit 21 is inserted into the recess 28 of the holder 22, the left and right pins 53 are inserted into the corresponding pin insertion holes 66, and the elastic claws 67 are locked in the locking holes 68. Further, the bulging portion 55 is inserted into the flange side insertion hole 34. Next, the left and right pins 53 are inserted into the corresponding pin locking holes 25. At this time, by moving the airbag unit 21 and the holder 22 forward, the left and right pins 53 are inserted from the rear end of the lateral hole portion 25B of the corresponding pin locking hole 25, and subsequently the airbag unit 21 and the holder. By moving 22 upward, each pin 53 is moved to the upper end of the corresponding vertical hole portion 25A. As a result, the left and right bulging portions 55 face the corresponding support plate 23, and the first bolt hole 56 and the second bolt hole 71 are aligned with each other. Next, the airbag unit 21 and the holder 22 are placed on the left and right side frames by inserting the first bolt 74 and the second bolt 75 into the first bolt hole 56 and the second bolt hole 71 and screwing them into the weld nut 72. Fasten to 11. As a result, the holder 22 and the airbag unit 21 are attached to the seat back frame 6.

Next, the operation of the airbag 44 when it is deployed will be described. When the vehicle-mounted device detects a vehicle collision, a signal is input to the inflator 43, and the inflator 43 generates gas. The gas generated by the inflator 43 is supplied to the airbag 44, and the airbag 44 expands. When the airbag 44 expands, as shown in FIG. 10, an expansion pressure is applied to the case 41 and the lid 42 from the inside, the first case fragile portion 57 is torn, and the upper part of the lid 42 moves rearward with respect to the case 41. do. At this time, the second fragile portion is cleaved, and the rear portion of the case upper wall 47A moves upward with respect to the initial position. At the same time, the holder upper wall 29B receives the expansion pressure of the airbag 44 via the case upper wall 47A, and the left and right holder fragile portions 35 are cleaved. As a result, the rear portion of the holder upper wall 29B and the upper side portion 31A of the flange 31 move upward with respect to the initial position. As a result, a passage extending rearward and upward is formed between the lid 42 and the case upper wall 47A, and the airbag 44 expands rearward and upward.

In the sheet 1 according to the present embodiment, since the edge portion of the skin material 8 extends inside the holder 22 covered with the lid 42, there is a gap between the skin material 8 and the airbag unit 21 when viewed from the rear. It can be prevented from being formed. Further, since the reinforcing member 32 suppresses the deformation of the flange 31, the spread between the flange 31 and the lid 42 is suppressed. As a result, it is possible to suppress the entry of foreign matter between the flange 31 and the lid 42. Further, since the rigidity of the holder 22 is improved by the reinforcing member 32, the airbag unit 21 can be stably supported by the side frame 11 via the holder 22.

Since the reinforcing member 32 is arranged so as to avoid the fragile portion 35 of the holder, the holder 22 can be opened even when the reinforcing member 32 is provided on the holder 22, and the deployment of the airbag 44 can be promoted. Further, since the reinforcing member 32 is arranged so as to avoid the flange side insertion hole 34, the bulging portion 55, the first bolt 74, and the second bolt 75 can be arranged through the flange 31.

When viewed from the rear, one of the reinforcing members 32 overlaps with the support plate 23 of the left side frame 11 at the left end and overlaps with the support plate 23 of the right side frame 11 at the right end, so that it is forward-looking caused by the deployment of the airbag 44. The reaction force can be stably supported by the side frame 11 via the reinforcing member 32.

Since the airbag unit 21 and the holder 22 are fastened together with the support plates 23 of the left and right side frames 11 by the first bolt 74 and the second bolt 75, the mounting work can be facilitated.

Since the bulging portion 55 of the fastening plate 46D passes through the flange side insertion hole 34 and comes into contact with the support plate 23, and the fastening plate 46D and the support plate 23 are fastened at the bulging portion 55, the side frame 11 is an airbag. The unit 21 can be supported with good stability.

Since the left and right pins 53 are locked in the pin locking holes 25 provided in the left and right side frames 11, the number of joints between the airbag unit 21 and the side frame 11 increases, and the airbag unit 21 is attached to the side frame 11. It can be supported with good stability. Since the left and right pin locking holes 25 are opened rearward by the lateral hole portion 25B, the left and right pins 53 can be locked to the left and right pin locking holes 25 with a simple operation. Since the left and right pins 53 penetrate the left and right holder side walls 29C of the holder 22, the case 41 and the holder 22 can be temporarily fixed to each other.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment. For example, the reinforcing member 32 may be arranged along the surface of the flange 31. In this case, the reinforcing member 32 can be easily arranged on the flange 31. Further, the reinforcing member 32 may be a metal plate formed into a corrugated shape. In this case, the rigidity of the reinforcing member 32 can be improved, and the weight can be reduced.

Instead of the first bolt 74, the second bolt 75, and the weld nut 72, the case 41 and the holder 22 may be fastened together with the side frame 11 by other fastening members such as rivets.

1: Seat 4: Seat back 6: Seat back frame 8: Skin material 11: Side frame 14: Cross frame 21: Airbag unit 22: Holder 23: Support plate 25: Pin locking hole 25A: Vertical hole 25B: Horizontal Hole 28: Recess 29: Holder body 31: Flange 32: Reinforcing member 34: Flange side insertion hole 35: Holder fragile part 41: Case 42: Lid 43: Inflator 44: Airbag 46: Retainer 46D: Fastening plate 53: Pin 56: 1st bolt hole 57: 1st case fragile part 58: 2nd case fragile part 59: Notch 61: Opening hole 67: Elastic claw 68: Locking hole 71: 2nd bolt hole 74: 1st bolt (1st bolt) 1 Fastening member)
75: 2nd bolt (2nd fastening member)

Claims (8)

A vehicle seat with a seat cushion and a seat back.
A seat back frame that includes a pair of left and right side frames that extend vertically,
A holder that extends to the left and right and is connected to the corresponding side frame at both left and right ends,
An airbag unit that is received by the holder and expands toward the rear,
It has a skin material that forms the outer surface of the seat back and has an opening that exposes the airbag unit to the rear.
The holder has a holder body that defines a recess that opens toward the rear, and a flange provided on the edge of the recess in the holder body.
The airbag unit includes a case arranged in the recess and opened rearward, a lid that closes the opening end of the case and faces the flange at an edge portion, and an inflator provided in the case. And with an airbag,
The edge of the perforation of the skin material passes between the flange and the lid, extends into the recess, and is locked to the holder body.
The holder has at least one reinforcing member provided on the flange.
The holder body and the flange are made of resin, and the reinforcing member is made of metal.
The reinforcing member is a plate-shaped member, and is a vehicle seat characterized in that it is arranged inside the flange . The vehicle seat according to claim 1 , wherein the reinforcing member is formed in a corrugated shape. The holder extends along each of the bottom wall, the upper wall, the left and right side walls, and the lower wall defining the recess and the boundary between the upper wall and the left and right side walls, and extends to the outer peripheral edge of the flange. It has a pair of left and right holder fragile parts that tear due to the expansion pressure of the airbag.
The vehicle seat according to claim 1 or 2 , wherein the reinforcing member is arranged so as to avoid the holder fragile portion. The vehicle sheet according to claim 3 , wherein the holder fragile portion has at least one of a plurality of through holes and a plurality of thin-walled portions thin with respect to the side wall. The flange has an insertion hole through which a bolt for fastening the holder to the side frame passes.
The vehicle seat according to claim 1 or 2 , wherein the reinforcing member is arranged so as to avoid the insertion hole. A vehicle seat with a seat cushion and a seat back.
A seat back frame that includes a pair of left and right side frames that extend vertically,
A holder that extends to the left and right and is connected to the corresponding side frame at both left and right ends,
An airbag unit that is received by the holder and expands toward the rear,
It has a skin material that forms the outer surface of the seat back and has an opening that exposes the airbag unit to the rear.
The holder has a holder body that defines a recess that opens toward the rear, and a flange provided on the edge of the recess in the holder body.
The airbag unit includes a case arranged in the recess and opened rearward, a lid that closes the opening end of the case and faces the flange at an edge portion, and an inflator provided in the case. And with an airbag,
The edge of the perforation of the skin material passes between the flange and the lid, extends into the recess, and is locked to the holder body.
The holder has at least one reinforcing member provided on the flange.
The holder body and the flange are made of resin, and the reinforcing member is made of metal.
One of the reinforcing members is a vehicle seat provided below the recess in the flange and extending from one side frame to the other side frame. The vehicle seat according to claim 6 , wherein the reinforcing member provided below the recess in the flange is located behind the corresponding side frame at both ends. The lid is swingably coupled to the lower edge of the open end of the case and to the upper edge and left and right side edges of the open end of the case via a case fragile portion that is torn by the expansion pressure of the airbag. The vehicle seat according to claim 3 , wherein the seat is made of a vehicle.

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