JP2019031154A - Vehicle seat - Google Patents

Abstract

To arrange an air bag, which is developed backward, in an inside of a seat back of a vehicle seat.SOLUTION: In a vehicle seat 1, a seat back includes a seat back frame 7 having a side frame 11 and an upper frame 12, an air bag module 43 supported on the seat back frame through a bracket 31, and a skin member 9. The air bag module includes an air bag 45, an inflator 46 arranged on a lower side of the air bag, and a retainer 48 which houses the air bag and the inflator and opens backward. The retainer has an upper wall 44, which is opposite to the inflator and faces downward, on an upper side of the air bag. A fragile part 80, which is opened by expansion of the air bag, is arranged on the skin member. The air bag is guided to expand backward by the upper wall. The fragile part extends in a longitudinal direction of the skin member and is arranged on a back side of the air bag.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a front seat for a vehicle equipped with an airbag.

  In a vehicle, there is a vehicle seat provided with an airbag module that is deployed rearward in a front seat (for example, Patent Document 1). In such a vehicle seat, the airbag module is attached to the back surface of the seat back, and the passenger in the rear seat is protected by the airbag deployed rearward at the time of a front collision.

Japanese Utility Model Publication No. 6-87060

  The airbag module is externally attached to the seat back. For this reason, there is a problem that it protrudes rearward of the seat back and it is difficult to secure a space between the front seat and the rear seat.

  In view of the above background, an object of the present invention is to mount an airbag module deployed rearward in a vehicle seat and to accommodate the airbag module in a seat back.

  In order to solve the above-described problem, a vehicle seat (1) including a seat cushion (3) and a seat back (4), wherein the seat back extends in a pair of left and right side frames (11 ) And an upper frame (12) connecting the upper ends of the side frames to each other, and an airbag module (43) supported on the seat back frame via a bracket (31). A skin member (9) for covering the seat back frame, the bracket, and the airbag module from the back, the airbag module being provided on the lower side of the airbag (45), An inflator (46) for inflating an air bag, and the air bag and the inflator are accommodated and opened rearward The retainer has a guide wall (44) facing the inflator and facing downward on the upper side of the airbag, and is opened to the skin member by inflation of the airbag. A weakened portion (80) to be provided is provided, and the airbag is guided by the guide wall so as to be inflated rearward. The weakened portion extends in the left-right direction in the skin member, and is disposed at the rear of the airbag. It is characterized by being.

  According to this aspect, since the airbag module is covered by the skin member that covers the seatback frame, the airbag module can be accommodated in the seatback. Moreover, an airbag can be expand | deployed back by forming a weak part in the skin material which covers an airbag module from the back.

  In the above aspect, the fragile portion may be disposed below the upper frame.

  According to this aspect, since the load applied to the skin member due to the inflation of the airbag is easily transmitted to the fragile portion, the fragile portion is easily opened.

  Moreover, said aspect WHEREIN: It is good for the said weak part to be arrange | positioned substantially back of the said guide wall.

  According to this aspect, since the airbag is guided by the guide wall so as to inflate toward the fragile portion, a load is easily applied to the stitched portion.

  In the above aspect, it is preferable that at least a part of the fragile portion overlaps the bracket in a rear view, and the airbag module is provided on the back surface of the bracket.

  According to this aspect, since the fragile portion overlaps the bracket in the rear view, the airbag easily passes through the fragile portion, and the airbag is easily deployed behind the seat back. Further, the airbag module can be supported by the bracket when the airbag is deployed or when a passenger in the rear seat collides with the airbag.

  In the above aspect, the bracket is formed in a plate shape having a main surface facing forward and backward, and the bracket is provided with a recess (41) for housing the airbag module forward. It is good to have.

  According to this aspect, since the airbag module is housed in the recess, the amount of protrusion of the airbag module from the back surface of the seat back can be suppressed.

  In the above aspect, it is preferable that at least a part of the fragile portion overlaps the concave portion in a rear view.

  According to this aspect, the airbag can be easily passed through the fragile portion.

  Moreover, said aspect WHEREIN: The said weak part is good to overlap with the upper half part of the said recessed part by the back view.

  According to this aspect, the airbag can be deployed rearward from the upper side of the seat back.

  Moreover, in said aspect, the width | variety of the left-right direction of the said weak part is good to be larger than the width of the left-right direction of the said recessed part by back view.

  According to this aspect, the airbag can be easily passed through the fragile portion. Moreover, the width in the left-right direction of the airbag during deployment can be further increased.

  Further, in the above aspect, the bracket includes a main part (30) provided with the recess, a pair of left and right upper tongues (34) extending from an upper edge of the main part and coupled to the upper frame, A pair of left and right lower tongues (35) extending left and right from the lower left and right edges of the main part and coupled to the side frame, and the width of the weak part in the left-right direction is a rear view of the main part It may be larger than the width in the left-right direction.

  According to this aspect, it becomes easier to pass the airbag through the fragile portion. Moreover, the width in the left-right direction of the airbag during deployment can be further increased.

  In the above aspect, a through hole may be formed in the bottom wall (42) of the recess, and the airbag module may be fastened to the bottom wall by a fastener (50) passing through the through hole. .

  According to this aspect, the forward load applied to the bracket when the airbag is deployed can be supported by the bracket. Moreover, since the fastening location of an airbag module is the bottom wall of a recessed part, it is easy to fasten an airbag module to a bracket.

  In the above aspect, when a through hole is formed in the lower side wall (96) of the recess, and the airbag module is fastened to the side wall by a fastener (50) passing through the through hole. Good.

  According to this aspect, the fastener does not protrude forward, and it is possible to suppress the feeling of foreign matter given to the seated passenger's back.

  Moreover, in said aspect, a pad member (8) is provided between the said skin member and the said bracket, and the slit (71 which penetrates the said pad member in the thickness direction toward the said weak part from the said airbag module. ) May be formed.

  According to this aspect, the airbag can be deployed behind the seat back.

  According to the above aspect, in the vehicle seat, it is possible to mount the airbag module deployed rearward and accommodate the airbag module in the seat back.

  Moreover, according to the aspect by which the weak part is arrange | positioned under the upper frame, the load added to an outer skin member by expansion | swelling of an airbag becomes easy to be transmitted to a weak part. Therefore, it becomes easy to open a weak part.

  Moreover, according to the aspect arrange | positioned in the substantially back of the said guide wall, since a airbag is guided so that an airbag may expand | swell toward a weak part by a guide wall, it becomes easy to apply a load to a weak part.

  In addition, according to the aspect in which at least a part of the fragile portion overlaps with the bracket in the rear view and the airbag module is provided on the rear surface of the bracket, the fragile portion overlaps with the bracket in the rear view. It is easy to pass through the part, and the airbag is easily deployed behind the seat back. Further, the airbag module can be supported by the bracket when the airbag is deployed or when a passenger in the rear seat collides with the airbag.

  Moreover, according to the aspect in which the recessed part for accommodating an airbag module is dented toward the front in the bracket, since the airbag module is accommodated in the recessed part, the back surface of the seat back of the airbag module The amount of protrusion from can be suppressed.

  Moreover, according to the aspect in which at least a part of the fragile portion overlaps the concave portion in the rear view, the airbag can easily pass through the fragile portion.

  Moreover, according to the aspect which the weak part has overlapped with the upper half part of the said recessed part by the back view, an airbag can be expand | deployed back from the upper side of a seat back.

  Further, according to an aspect in which the width in the left-right direction of the fragile portion is larger than the width in the left-right direction of the recess in the rear view, the airbag can easily pass through the fragile portion. Moreover, the width in the left-right direction of the airbag during deployment can be further increased.

  Moreover, according to the aspect in which the width in the left-right direction of the fragile portion is larger than the width in the left-right direction of the bracket main portion in the rear view, the airbag can easily pass through the fragile portion. Moreover, the width in the left-right direction of the airbag during deployment can be further increased.

  Further, according to the aspect in which the through-hole is formed in the bottom wall of the recess and the airbag module is fastened to the bottom wall by a fastener that passes through the through-hole, the bracket is attached to the bracket when the airbag is deployed. Can support the load. Moreover, since the fastening location of an airbag module is the bottom wall of a recessed part, it is easy to fasten an airbag module to a bracket.

  According to the aspect in which the through hole is formed in the lower side wall of the recess and the airbag module is fastened to the lower side wall by the fastener passing through the through hole, the fastener does not protrude forward. The foreign object feeling given to the seated occupant's back can be suppressed.

  Moreover, according to the aspect by which the pad member is formed with the slit penetrating in the thickness direction from the airbag module toward the fragile portion, the airbag can be deployed behind the seat back.

Explanatory drawing which shows the expansion | deployment of the airbag in a vehicle seat Rear view of vehicle seat frame Rear view of vehicle seat IV-IV sectional view of FIG. 3 of the vehicle seat in the first embodiment Sectional drawing of the vehicle seat in 2nd Embodiment Sectional drawing of the vehicle seat in 3rd Embodiment Sectional drawing of the vehicle seat which concerns on another embodiment from which arrangement | positioning of (A) 2nd webbing and (B) 1st webbing differ compared with 1st Embodiment. Rear view of a vehicle seat according to another embodiment in which (A) two slits intersecting the pad member and (B) a substantially H-shaped slit are provided. (A) Sectional drawing of the vehicle seat which concerns on another embodiment at the time of providing the backboard which has a thin part, and (B) the backboard which has a slit (A) Sectional view of vehicle seat according to another embodiment when outer case is omitted and (B) retainer and lid are omitted

  Hereinafter, two embodiments in which a vehicle seat according to the present invention is applied to an automobile will be described with reference to the drawings.

<< First Embodiment >>
As shown in FIG. 1, the vehicle seat 1 according to the first embodiment of the present invention constitutes a front seat in the first row of an automobile. The seat includes a seat cushion 3 provided on the floor 2 of the automobile, a seat back 4 supported on the rear portion of the seat cushion 3, and a headrest 5 provided on the top of each seat back 4.

  As shown in FIG. 2, the seat back 4 is provided on the surface of the seat back frame 7 as a skeleton, the pad member 8 supported by the seat back frame 7, and the pad member 8. It has the skin member 9 to comprise.

  The seat back frame 7 includes a pair of left and right side frames 11 extending vertically, an upper frame 12 extending left and right and coupled to the upper ends of the left and right side frames 11, and left and right side frames 11 extending left and right. And a lower frame 13 coupled to the lower portion. The side frame upper parts 14 and the upper frame 12 constituting the upper parts of the left and right side frames 11 are formed by bending a single circular pipe material into an inverted U-shaped frame shape. Moreover, each side frame lower part 15 which comprises the lower part of each side frame 11 is each formed with the sheet-metal member, and is welded to the both ends of the pipe material. Support members 16 are suspended on the left and right side frames 11 in pairs. A plate-shaped pressure receiving member 17 that supports the occupant's back so as to be retractable is coupled to the front side of the support member 16.

  As shown in FIG. 2, the upper portion of the seat back frame 7 is formed by the upper frame 12 and the left and right side frame upper portions 14 and has a substantially trapezoidal shape when viewed from the back.

  The upper frame 12 has a planar front side surface 21 on the front side of the middle portion on the left and right sides thereof. The front side surface 21 is formed by compressing and deforming a circular pipe material so that the cross section becomes a semicircular shape. A pair of left and right pillar support brackets 22 are welded to the front side surface 21. Each pillar support bracket 22 is formed in a square cylindrical shape having both ends opened. The pillar support brackets 22 have their respective axes extending substantially vertically and are arranged at intervals on the left and right. A pillar support member 23 is inserted into the pillar support bracket 22. The pillar support member 23 includes a cylindrical portion 24 and a flange portion 25 that protrudes laterally from the upper end of the cylindrical portion 24. The axial direction of the cylindrical portion 24 is substantially parallel to the extending direction of the side frame 11.

  The headrest 5 includes a headrest main body 27 and a pair of left and right pillars 28 protruding from the headrest main body 27. By fitting the pillar 28 into the cylinder part 24, the headrest 5 is supported by the seat back frame 7 so as to be displaceable along the axis of the cylinder part 24. The flange portion 25 is provided with locking means (not shown) for fixing the insertion position of the pillar 28 with respect to the cylindrical portion 24. The headrest 5 is fixed at a predetermined position by locking means.

  A bracket 31 is coupled to both the side frames 11 and the upper frame 12. The bracket 31 is located in the upper half of the seat back frame 7. The bracket 31 has a plate shape generally facing the front-rear direction. The bracket 31 is composed of a single plate member drawn from one sheet metal, and includes a plate-shaped main portion 30 having a main surface facing forward and backward, and a pair of left and right extending in a band shape upward from the upper edge of the main portion 30. The upper tongue piece 34 and a pair of left and right lower tongue pieces 35 extending outward from the left and right lower portions of the main portion 30. The main portion 30 includes a central portion 32 that constitutes an upper portion thereof, and a bottom side portion 33 provided on the lower side of the central portion 32.

  The central portion 32 has a substantially trapezoidal shape with a width in the left-right direction becoming narrower in the rear view. The central portion 32 is generally the same shape as the upper portion of the seat back frame 7.

  The upper tongue piece 34 extends upward from the left and right ends of the upper edge of the central portion 32, and is formed with a space left and right. The upper tongue piece 34 is disposed symmetrically with respect to the center line of the seat back frame 7 in the left-right direction. The upper tongue pieces 34 are curved at the upper end along the rear surface of the upper frame 12 and are welded to the upper frame 12. The lower tongue pieces 35 are respectively curved along the rear surface of the side frame upper part 14 and are welded to the side frames 11 respectively. In the present embodiment, the upper tongue piece 34 is on the upper part of the rear surface of the upper frame 12 (the broken line portion in FIG. 2), and the lower tongue piece 35 is on the left and right outer portions of the rear surface of the side frame upper portion 14 (the broken line portion in FIG. 2). Welded.

  As shown in FIG. 4, the lower edge of the bottom 33 is provided with an edge wall 36 extending forward over the entire lower edge. A pair of left and right fragile portions 37 are formed at the boundary between the bottom portion 33 and the lower tongue piece 35. In the present embodiment, the bracket 31 is bent at the fragile portion 37 so as to protrude forward in a U shape. A plurality of lightening holes 38 are formed at appropriate positions on the bottom side portion 33 to reduce the weight of the bracket 31.

  On the rear surface of the central portion 32, a concave portion 41 that is recessed forward is formed substantially at the center. The bottom of the recess 41 overlaps the side frame 11 in a side view. The recess 41 is defined by a flat plate-like recess bottom wall 42 facing substantially in the front-rear direction and a side wall surrounding the recess bottom wall 42. The bottom wall 42 of the recess is inclined rearward downward with respect to the axial direction of the pillar 28 in a side view. The recess bottom wall 42 has a substantially rectangular shape extending left and right in the rear view, and the recess 41 has a substantially rectangular parallelepiped shape.

  A resin outer case 40 is accommodated in the recess 41. The outer case 40 has a substantially rectangular parallelepiped shape extending left and right. The outer case 40 includes a bottom wall 40B facing in the front-rear direction and a side wall 40S surrounding the bottom wall 40B. The outer case 40 is formed with a housing recess 40R defined by the bottom wall 40B and the side wall 40S. The accommodation recess 40R is recessed forward and opened rearward. Locking claws 40C projecting outward in the vertical direction are provided at predetermined positions on the upper surface and the lower surface of the outer case 40, respectively. The upper wall and the lower wall of the recess 41 are provided with locking holes that penetrate the positions corresponding to the locking claws 40C and engage with the locking claws 40C.

  A fitting protrusion 40P that protrudes forward is provided at a predetermined position on the front surface of the outer case 40, and a positioning hole that penetrates to a position corresponding to the fitting protrusion 40P is provided in the recess bottom wall 42. When the outer case 40 is coupled to the recess 41, the outer claw 40C is engaged with the locking hole, and the fitting protrusion 40P is inserted into the positioning hole, so that the outer case 40 is easily placed at an appropriate position. be able to.

  At the opening edge of the outer case 40, an extending portion 40E extending substantially perpendicular to the side wall 40S is provided. The extending portion 40E extends outward beyond the opening edge that defines the opening portion of the concave portion 41 of the bracket 31. At least a part of the opening edge of the recess 41, preferably all the opening edges, are covered with the extending part 40E from the rear.

  The airbag module 43 is accommodated in the accommodation recess 40R. The airbag module 43 abuts against the bottom wall 40B, and the airbag module 43 is housed in the recess 41. The airbag module 43 includes an airbag 45, an inflator 46 that inflates the airbag 45, and a case 47 that accommodates the airbag 45 and the inflator 46.

  The case 47 has a substantially rectangular parallelepiped shape, and includes a retainer 48 having a recess that opens rearward, and a lid 49 that closes the opening of the recess.

  The inflator 46 has a substantially cylindrical shape. The inflator 46 is accommodated in a recessed portion of the retainer 48 so as to extend to the lower half of the retainer 48, more specifically, the front lower corner thereof, and is coupled to the retainer 48. The airbag 45 is accommodated in the recessed portion of the retainer 48 in a folded state. The airbag 45 is disposed so as to cover the inflator 46 from above.

  The retainer 48 includes an upper wall 44 that defines the recess. The upper wall 44 has a surface facing downward and faces the inflator 46 vertically. An airbag 45 is disposed between the upper wall 44 and the inflator 46.

  The lid 49 is made of resin. The lid 49 is a substantially rectangular parallelepiped plate-like lid body 49B having a main surface facing in the front-rear direction, and a lid that extends forward from the top, bottom, left, and right ends of the lid body 49B, and has a locking claw at the end. A body locking portion 49L. Locking holes are respectively provided in the upper, lower, left and right walls of the retainer 48, and the lid 49 is coupled to the retainer 48 by engaging the locking claws with the locking holes. A groove extending left and right is formed inside the lid body 49B. The lid body 49B is thinner in the groove 53 than in other portions. The grooves 53 extend in the vertical direction from the left and right ends, and extend to the upper and lower ends of the lid body 49B.

  A hinge 49H is formed at a connecting portion between the lid body 49B and the lid locking portion 49L, and the lid 49 is hinged to the upper edge and the lower edge of the opening of the retainer 48. When a load is applied to the lid body 49 due to the inflation of the airbag 45, the lid body 49 is cleaved along the groove 53. Therefore, the groove 53 functions as a deployment port. When the lid 49 is cleaved, the rear upper side and the rear lower side of the lid 49 rotate about the upper edge and the lower edge as axes, respectively, and the case 47 is opened. Since the opening edge of the recessed portion 41 of the bracket 31 is covered with the extending portion 40E from the rear, the airbag 45 does not directly contact the opening edge of the recessed portion 41 when the airbag 45 is inflated. 45 damage is prevented.

  A male screw portion 50 protruding forward is provided on the front surface of the retainer 48. The bottom wall of the outer case 40 and the bottom wall 42 of the recess are provided with through holes 51 and 44T penetrating at positions corresponding to the male screw portions 50, respectively. After the male screw part 50 is passed through the two through holes 51 of the outer case 40 and the recess bottom wall 42, the nut 52 is attached to the male screw part 50, whereby the airbag module 43 is fastened to the bracket 31 together with the outer case 40. Yes. After fastening, the case 47 is disposed at a position overlapping the side frame 11 in a side view.

  A pair of left and right mounting holes 55 penetrating in the thickness direction is formed above the central portion 32 and above the concave portion 41.

  A blower 56 as a blower is coupled to the front surface of the concave bottom wall 42. The blower 56 includes a blower case 57, a motor 58 housed in the blower case 57, and a fan 60 that is coupled to a rotating shaft 59 of the motor 58.

  The blower case 57 has a substantially rectangular parallelepiped shape having a surface facing in the front-rear direction. An opening is formed in the front wall of the blower case 57. The blower case 57 is formed with a through-hole penetrating forward and backward at a predetermined position, and a screw hole is formed at a position corresponding to the through-hole of the recess bottom wall 42. The blower case 57 passes through the through hole and is coupled to the substantially center in the left-right direction of the front surface of the recess bottom wall 42 by a screw that is coupled to the screw hole. The front wall of the blower case 57 is substantially parallel to the recess bottom wall 42, and the blower case 57 is disposed between the left and right pillars 28. In the present embodiment, the width of the blower case 57 in the front-rear direction is sufficiently thin, and the front wall of the blower case 57 is located behind the pillar 28 in a side view.

  A cable (not shown) for supplying electric power from the outside of the vehicle seat 1 is connected to the motor 58. The motor 58 is driven by the supplied power, and the fan 60 rotates. Air (air) is jetted forward by the rotation of the fan 60.

  The pad member 8 is formed from a flexible cushioning material such as polyurethane foam. The pad member 8 includes a front surface portion 65 constituting a backrest surface 64 facing the back of the occupant, an upper surface portion 66 extending rearward from the upper edge of the front surface portion 65, and a side surface portion extending rearward from the left and right side edges of the front surface portion 65. 67 and a rear surface portion 68 extending downward from the rear end of the upper surface portion 66.

  The front surface portion 65 extends vertically and has a substantially rectangular plate shape having a predetermined thickness in the front and rear. The front surface portion 65 is in contact with the front surfaces of the side frames 11, the upper frame 12, and the pressure receiving member 17 on the rear surface. The front surface portion 65 is formed with a vent hole 69 penetrating forward and backward in front of the blower 56. The air jetted from the blower 56 passes through the ventilation holes 69 and reaches the backrest surface 64.

  The upper surface portion 66 extends rearward from the upper edge of the front surface portion 65 to the rear edge of the upper frame 12 in a side view. A through hole 70 is formed in the upper surface portion 66 so as to penetrate vertically in a portion corresponding to the upper ends of the left and right pillar support brackets 22. A corresponding pillar support bracket 22 is inserted into each through hole 70.

  Each of the side surface portions 67 extends rearward from the left and right side edges of the front surface portion 65 along the left and right outer surfaces of the side frame 11 and reaches the rear surface of the side frame 11.

  The rear surface portion 68 extends downward from the rear end of the upper surface portion 66 and reaches the lower end of the bracket 31. The rear surface portion 68 is formed with a first slit 71 penetrating in the thickness direction behind the recess bottom wall 42, more specifically behind the groove 53. The first slit 71 extends substantially perpendicular to the recess bottom wall 42 in the penetrating direction. As shown in FIG. 3, the first slit 71 extends in the left-right direction from between the left side frame 11 and the left wall of the recess 41 to between the right side frame 11 and the right wall of the recess 41. . The width in the left-right direction of the first slit 71 is preferably larger than the width in the left-right direction of the recess 41 and larger than the width in the left-right direction of the central portion 32.

  Two rear slits 72 penetrating in the thickness direction are formed in the rear surface portion 68 at the rear of each mounting hole 55. Each of the second slits 72 may be inclined so as to approach the opening on the surface of the first slit 71 toward the rear in the penetration direction. The width of the second slit 72 in the left-right direction is approximately equal to the mounting hole 55 in the left-right direction.

  As shown in FIGS. 3 and 4, the skin member 9 includes a front sheet material 75 that integrally covers the front surface portion 65, the upper surface portion 66, the side surface portion 67, and the rear surface portion 68 of the pad member 8, and a seat back. 4 is formed in a bag shape by combining with the rear sheet material 76 constituting the rear surface of the four.

  The front sheet material 75 is formed by stitching a plurality of pieces formed by sheet-like members such as cloth and leather. The front sheet material 75 includes a front piece that covers the surface of the front surface portion 65, a side piece 77 that covers the surfaces of the left and right side surface portions 67, and an upper piece 78 that covers the surfaces of the upper surface portion 66 and the rear surface portion 68. doing. The upper edge of the front piece and the front edge of the upper piece 78, the left and right side edges of the front piece and the front edge of the side piece 77, and the upper edge of the side piece 77 and the left and right side edges of the upper piece 78 are mutually It is sutured. The rear sheet material 76 is formed by a rear piece 79 formed by a sheet-like member. The rear piece 79 has a substantially rectangular shape extending vertically. The upper edge of the rear piece 79 and the rear edge of the upper piece 78 are stitched together to form a stitched portion 80. The stitched portion 80 functions as a fragile portion that breaks with a smaller load than other stitched portions.

  The stitching portion 80 is disposed behind the opening on the rear end side of the first slit 71. The stitching portion 80 is located behind the upper half of the recess 41, more specifically, substantially behind the upper wall 44 of the retainer 48. Therefore, the stitching portion 80 is located above the inflator 46. The stitching portion 80 is formed to extend left and right. The left end and the right end of the stitching portion 80 are positioned on the left and right outer sides of the recess 41, respectively. The left end and the right end of the stitching portion 80 are preferably located on the left and right outer sides of the main portion 30 of the bracket 31.

  The upper side edge of the rear piece 79 and the upper side edge of the side piece 77 are stitched together. The lower side edge portion of the rear piece 79 and the lower side edge portion of the side piece 77 are connected to each other by a fastener, a hook-and-loop fastener, a snap fit, or the like. Thereby, after covering the skin member 9 on the seat back frame 7 and the pad member 8, the skin member 9 can be coupled to the seat back 4 by coupling the rear piece 79 and the side piece 77.

  Between the bracket 31 and the skin member 9, a first force cloth 81 and a second force cloth 82 for restricting the deployment direction of the airbag 45 are provided. Each of the first force cloth 81 and the second force cloth 82 is formed of a sheet-like member that is less stretchable than the skin member 9. One end sides of the first force cloth 81 and the second force cloth 82 are coupled to the bracket 31 on the upper and lower sides of the airbag module 43, respectively. A pair of left and right clips 83 are coupled to one end of the first force cloth 81. Each clip 83 is fitted in the corresponding mounting hole 55. A hook 84 that is a J-shaped hooking member is coupled to one end of the second force cloth 82. Each hook 84 is hooked on the edge wall 36. The first force cloth 81 extends rearward from each clip 83, passes through the second slit 72, and reaches the vicinity of the upper side of the stitching portion 80. The second force cloth 82 extends rearward and extends upward along the lower edge and the rear edge of the rear surface portion 68 to reach the vicinity of the lower side of the stitching portion 80. The other end side of the first force cloth 81 and the lower edge of the upper piece 78 are stitched together in the vicinity of the stitching portion 80. The other end side of the second force cloth 82 and the upper edge of the rear piece 79 are stitched together in the vicinity of the stitching portion 80.

  Next, the operation of the vehicle seat 1 will be described. Due to the front collision or the like, acceleration and load directed forward are applied to the passenger in the rear seat. In order to detect the load applied to the passenger in the rear seat, for example, a sensor 92 that detects the load applied to the seat belt 91 worn by the passenger in the rear seat may be provided.

  When the acceleration of the passenger in the rear seat or the load applied to the seat belt 91 exceeds a predetermined value, the gas is released from the inflator 46. The airbag 45 inflated upward by the gas released from the inflator 46 is guided rearward by the lower surface of the upper wall 44 of the retainer 48. Therefore, the upper wall 44 of the retainer 48 functions as a guide wall that guides the inflation direction of the airbag 45. Due to the rearward expansion of the airbag 45, a load is applied to the lid body 49, the lid body 49 is cleaved in the groove 53, and the case 47 of the airbag module 43 is opened. The airbag 45 protrudes from the case 47, is guided by the first force cloth 81 and the second force cloth 82, passes through the first slit 71, and reaches the stitching portion 80. At this time, the stitching portion 80 is broken by the load from the airbag 45, and an opening is formed in the skin member 9. The airbag 45 projects from the rear surface of the seat back 4 through the opening, expands rearward and obliquely upward, and then expands to extend downward and rearward. The airbag 45 has an upward arch shape when deployed (broken line in FIG. 1). Therefore, the airbag 45 can be deployed on the front side of the upper body of the occupant regardless of the distance between the vehicle seat 1 and the rear seat. When the rear seat is close to the vehicle seat 1, the airbag 45 is bent, so that the rearward load applied to the occupant by the deployment of the airbag 45 can be reduced.

  Next, the effect of the vehicle seat 1 will be described. As shown in FIG. 4, the airbag module 43 is covered with the skin member 9 and disposed inside the seat back 4. Since the airbag module 43 is not exposed on the rear surface of the seat back 4, the design of the vehicle seat 1 can be improved. Moreover, since the airbag module 43 is covered with the pad member 8, the touch feeling of the back surface of the vehicle seat 1 is improved.

  Since the airbag module 43 is accommodated in the recessed part 41, the protrusion amount from the rear surface of the seat back 4 of the airbag module 43 can be suppressed. The front portion of the case 47 of the airbag module 43 is disposed below the upper frame 12 and at a position overlapping the side frame 11 in a side view. Therefore, the airbag module 43 is disposed more forward with respect to the seatback frame 7 than when the entire case 47 is positioned behind the side frame 11. Therefore, the protrusion amount to the back of the seat back 4 can be suppressed.

  The airbag 45 is inflated along the first slit 71 by the gas from the inflator 46. Due to the expansion, a load directed upward is applied to the first webbing 81 and a load directed downward is applied to the second webbing 82. The load applied to the first force cloth 81 and the second force cloth 82 is transmitted to the stitching portion 80, and the vicinity of the upper portion and the lower portion of the stitching portion 80 of the skin member 9 are pulled from above and below, respectively. Open. The airbag 45 is deployed behind the seat back 4 through the first slit 71 and the open stitching portion 80.

  By forming the second slit 72, the first webbing 81 can be disposed so as to extend substantially linearly from the rear of the attachment hole 55 to the front of the stitching portion 80. Therefore, the length of the first webbing 81 in the front-rear direction can be shortened. Therefore, the load applied to the first webbing 81 is easily transmitted to the stitched portion 80, and the stitched portion 80 is easily opened.

  The second force cloth 82 extends along the lower and rear edges of the pad member 8 and reaches the vicinity of the lower portion of the stitching portion 80. Therefore, after the pad member 8 and the skin member 9 are assembled and covered with the seat back frame 7, the hook 84 can be hooked on the edge wall 36 from below. Therefore, it is easy to attach the second webbing 82.

  The first webbing 81 is provided with a pair of clips 83, and the first webbing 81 can be easily coupled to the bracket 31 by inserting the clips 83 into the attachment holes 55. Further, since the first webbing 81 is coupled to the two mounting holes 55 arranged on the left and right, the region of the first webbing 81 that receives the load due to the inflation of the airbag 45 is expanded in the left-right direction, and the stitching portion 80 is further stretched. Further, a load due to the inflation of the airbag is easily applied.

  Since one end sides of the first force cloth 81 and the second force cloth 82 are locked in the vicinity of the airbag module 43 of the bracket 31, the load is easily transmitted to the first force cloth 81 and the second force cloth 82. Further, the first force cloth 81 and the second force cloth 82 can concentrate the load due to the deployment of the airbag 45 on the stitching portion 80, and the stitching portion 80 can be reliably broken when the airbag 45 is deployed. .

  The airbag 45 is inflated backward with respect to the recess 41. Since the central portion of the stitching portion 80 overlaps the concave portion 41 in the rear view, the airbag 45 that is inflated rearward easily passes through the stitching portion 80.

  As shown in FIG. 3, the stitching portion 80 extends to the left and right on the rear surface of the seat back 4. Therefore, the width (horizontal width) of the airbag 45 at the time of deployment can be increased, and a wide range of positions in the left-right direction of the occupant of the rear seat can be handled. Further, the left end and the right end of the stitching portion 80 are respectively located on the left and right outer sides of the recess 41, and preferably the left end and the right end of the stitching portion 80 are located on the left and right outer sides of the main portion 30 of the bracket 31. Thus, by increasing the lateral width of the stitching portion 80, the airbag 45 inflated rearward can easily pass through the stitching portion 80. Further, the lateral width of the airbag 45 at the time of deployment can be increased, and a wider range of correspondence can be achieved depending on the position of the rear seat occupant in the left-right direction.

  As shown in FIG. 2, the bracket 31 is coupled to the upper frame 12 at left and right intervals at left and right upper tongue pieces 34. Therefore, rotation about the substantially vertical direction of the upper part of the bracket 31 as an axis is restricted. Therefore, it is difficult for the bracket 31 to come off the seat back frame 7, and the coupling between the bracket 31 and the seat back frame 7 can be further strengthened.

  Since the bracket 31 is formed of a single plate member, it can be formed at a low cost and at a low cost. The bracket 31 has a substantially trapezoidal shape with a short side on the upper side, and has substantially the same shape as the upper part of the seat back frame 7. Therefore, the upper tongue piece 34 and the lower tongue piece 35 can be shortened. Further, since the upper right corner and the upper left corner of the bracket 31 are omitted, the bracket 31 is reduced in weight.

  A forward load is applied to the bracket 31 due to the deployment of the airbag 45 and the collision of the passenger in the rear seat. Since the upper tongue piece 34 is arranged along the rear surface of the upper frame 12 and the lower tongue piece 35 is arranged along the rear surface of the side frame upper part 14, the upper tongue piece 34 and the lower tongue piece 35 are arranged in the upper portion. A load directed rearward from the rear surface of the frame 12 and the rear surface of the side frame upper portion 14 is applied. Therefore, the bracket 31 is supported by the seat back frame 7 and can resist a load directed forward.

  The airbag module 43 is fastened to the recess bottom wall 42. When the airbag 45 is deployed, a load directed to the front is applied to the airbag module 43. Since the airbag module 43 is fastened to the recess bottom wall 42, the bracket 31 resists the load, and the airbag module 43 is supported by the bracket 31. Further, since the airbag module 43 is fastened to the recess bottom wall 42, the airbag module 43 can be easily fastened to the bracket 31.

  The airbag module 43 is located in the upper half of the seat back frame 7. Therefore, since the airbag module 43 is disposed in front of the upper body of the passenger in the rear seat, the airbag 45 can be deployed on the front side of the upper body of the passenger in the rear seat, thereby protecting the upper body of the passenger in the rear seat. Can do. Further, since the stitching portion 80 is disposed behind the upper half of the concave portion 41, the airbag 45 can be deployed from a higher position of the seat back 4.

  The bracket 31 is disposed behind the pillar 28. Therefore, the bracket 31 can be attached without changing the position of the pillar 28.

  A passenger's back may move to the rear of the axis of the pillar 28 due to a load applied when sitting. Even in this case, since the concave bottom wall 42 is inclined rearward downward, the concave bottom wall 42 does not interfere with the back of the occupant, and the foreign object feeling given to the occupant can be suppressed. Further, since the bracket 31 is disposed above the pressure receiving member 17, it is possible to prevent the bracket 31 from giving a sense of foreign matter to the back of the occupant.

  Since the bottom 33 connects the side frames 11 to the left and right via the lower tongue piece 35, it functions as a cross member that increases the rigidity of the seat back frame 7. In order to increase the rigidity of the seat back frame 7, the bottom side portion 33 may be coupled from the upper end of the side frame 11 to a position of 5 percent or more and 20 percent or less of the total length of the side frame 11. In the case where the side frame 11 is formed with a bent portion 93 that bends inward and leftward and rightward, the bottom portion 33 is preferably coupled to the side frame 11 above the bent portion 93.

  The rigidity of the bottom 33 is enhanced by the edge wall 36. The lower wall defining the recess 41 and the edge wall 36 are opposed to each other, and the lower portion of the bracket 31 has a U-shape facing forward in a side view, so that the rigidity is further enhanced. By increasing the rigidity of the lower part of the bracket 31, the coupling between the side frames 11 is strengthened, and the rigidity of the seat back frame 7 can be further increased.

  By providing the blower 56 in the vehicle seat 1, air is ejected from the ventilation hole 69 of the seat back 4 toward the occupant seated, and the sitting comfort can be improved. Since the blower 56 is coupled to the bracket 31 that supports the airbag 45, there is no need to provide the bracket 31 for supporting the blower 56, the number of parts can be reduced, and the vehicle seat 1 can be simplified. Can do.

  Further, the passenger in the rear seat may collide with the airbag 45 due to the deployment of the airbag 45, and a load directed forward may be applied to the bracket 31. At this time, the forward load applied to the bracket 31 is absorbed by the deformation of the fragile portion 37 of the bracket 31. Therefore, the load applied to the passenger in the rear seat can be reduced. Moreover, it can prevent that a load is added to the passenger | crew of the vehicle seat 1 by the collision of the passenger | crew of a backseat.

<< Second Embodiment >>
In the vehicle seat 1 according to the second embodiment, as shown in FIG. 5, the airbag module 43 defines a lower portion of the concave portion 41 and faces a lower concave wall 96 facing the vertical direction as compared with the first embodiment. It is different in that it is concluded. The male screw portion 50 provided in the airbag module 43 extends downward. A through hole 51 is provided in the recess lower wall 96 at a position corresponding to the male screw portion 50. On the side wall 40S of the outer case 40, a through hole 40T is provided at a position corresponding to the male screw portion 50. The airbag module 43 is fastened to the concave lower wall 96 by passing the male screw part 50 through the through holes 51 and 41T and coupling the nut 52 to the male screw part 50. The airbag module 43 may be fastened to any of the side walls surrounding the recess bottom wall 42.

  Since the airbag 45 is deployed upward and rearward of the seat back 4, a load may be applied downward to the recess 41 when the airbag 45 is deployed. By fastening the airbag module 43 to the concave lower wall 96, the bracket 31 can resist a downward load during deployment. In addition, since the male screw portion 50 does not protrude forward, it is possible to suppress the feeling of foreign matter given to the seated passenger's back.

<< Third Embodiment >>
In the vehicle seat 1 according to the third embodiment, as shown in FIG. 6, the second slit 72 is not provided as compared with the first embodiment, and the first force cloth 81 and the second force cloth 82 are provided. Only the arrangement of is different. The first force cloth 81 is fixed to the attachment hole 55 by a clip 83 on one end side, extends downward along the back surface of the pad member 8, and reaches the stitching portion 80 through the first slit 71. The second force cloth 82 is hooked to the edge wall 36 by a hook 84 on one end side, extends upward along the back surface of the pad member 8, and reaches the stitching portion 80 through the first slit 71. Even in this arrangement, the first webbing 81 and the second webbing 82 regulate the deployment direction of the airbag 45 from the upper side and the lower side, respectively, so that the deployment direction of the airbag 45 faces the stitching portion 80. To be controlled.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the shape of the bracket 31 is not limited to the embodiment described above, and can be changed as appropriate. In the above embodiment, the second force cloth 82 is hooked to the edge wall 36 of the bottom 33 on one end side, but may be fitted to the meat hole 38 by a clip, for example. In the above embodiment, the first force cloth 81 and the second force cloth 82 are provided on the vehicle seat 1, but one of the first force cloth 81 and the second force cloth 82 is provided. May be. Moreover, in 1st Embodiment, as FIG. 7 (A) shows, only the 2nd cloth 82 may be changed so that the back surface of the pad member 8 may be followed, and only the 1st cloth 81 is changed. As shown in FIG. 7B, the pad member 8 may be changed along the back surface.

  In the above-described embodiment, the stitching portion 80 is formed on the rear surface of the seat back 4 so as to extend left and right. However, the side piece 77 is divided into upper and lower ends and the left and right ends of the stitching portion 80 are provided on the left and right outer surfaces of the side portion 67. Accordingly, the stitching portion 80 may be formed to extend from the left and right side surfaces of the seat back 4 to the left and right through the rear surface.

  Moreover, although the 1st slit 71 was formed in the said embodiment so that it might extend right and left to the pad member 8, it is not limited to this aspect. A third slit 100 that intersects the first slit 71 may be provided in the pad member 8 (FIG. 8A). Moreover, the 3rd slit 101 extended up and down from the both ends may be further provided in each both ends of the 1st slit 71 (FIG.8 (B)). By providing the third slits 100 and 101, the pad member 8 can be easily opened around the first slit 71, and the time required to deploy the airbag 45 can be shortened.

  In the above embodiment, the rear sheet material 76 formed of a sheet-like member is provided on the rear surface of the seat back 4. However, as shown in FIG. In addition, a backboard 110 formed of resin or the like may be provided. The backboard 110 is formed in a plate shape having main surfaces on the front and rear. The upper end of the backboard 110 is bent rearward along the rear surface portion 68 and extends upward. The backboard 110 is supported by the side frame 11. A thin portion 111 having a reduced thickness is formed on the upper portion of the backboard 110 so as to extend left and right in the rear view. The thin portion 111 is preferably formed substantially behind the groove 53 of the airbag module 43. When the airbag 45 is deployed, a load is applied from the airbag 45 to the backboard 110. Due to the load, the backboard 110 bends backward in the thin portion 111. Due to the bending of the backboard 110, a gap is generated between the backboard 110 and the skin member 9 covering the rear surface portion 68. The airbag 45 is deployed behind the seat back 4 through the gap.

  9B, the backboard 120 may be provided with a slit 121 that is cleaved by a load received from the airbag 45 when the airbag 45 is deployed. The slit 121 is disposed behind the airbag module 43. The slit 121 may be a groove formed on the front surface of the backboard 120. The slit 121 preferably includes a portion extending left and right and portions extending vertically from both ends thereof in a rear view, and is substantially H-shaped. By deploying the airbag 45, the backboard 120 is bent rearward at a portion extending left and right to form an opening in the backboard 120. The airbag 45 is deployed behind the seat back 4 through the opening.

  Moreover, in the said embodiment, although the outer case 40 was provided in the recessed part 41, as shown to FIG. 10 (A), by increasing the curvature of the opening edge 130 of the recessed part 41, the airbag at the time of expansion | swelling 45 may be prevented from being damaged. 10B, the outer case 40 may be fitted into the recess 41, and the airbag 45 and the inflator 46 may be accommodated in the accommodation recess 40R of the outer case 40. As shown in FIG.

1: Vehicle seat 3: Seat cushion 4: Seat back 7: Seat back frame 8: Pad member 9: Skin member 11: Side frame 12: Upper frame 30: Main part 31: Bracket 34: Upper tongue piece 35: Lower side Lower piece 41: Recess 42: Recess bottom wall 43: Airbag module 44: Upper wall (guide wall)
45: Airbag 46: Inflator 48: Retainer 50: Male thread (fastener)
51: Through hole 71: First slit 80: Suture portion (fragile portion)
96: lower wall of the recess

Claims (12)

A vehicle seat having a seat cushion and a seat back,
The seat back includes a pair of left and right side frames extending in the vertical direction and an upper frame connecting the upper ends of the side frames to each other, and an air supported by the seat back frame via a bracket. A bag module, and a skin member that covers the seat back frame, the bracket, and the airbag module from the back;
The airbag module includes an airbag, an inflator that is provided on the lower side of the airbag, inflates the airbag, and a retainer that houses the airbag and the inflator and opens rearward.
The retainer has a guide wall facing the inflator and facing downward on the upper side of the airbag,
The skin member is provided with a fragile portion to be opened by the inflation of the airbag,
The airbag is guided by the guide wall so as to inflate rearward,
The vehicle seat according to claim 1, wherein the fragile portion extends in the left-right direction in the skin member and is disposed behind the airbag.   The vehicle seat according to claim 1, wherein the fragile portion is disposed below the upper frame.   The vehicle seat according to claim 2, wherein the weakened portion is disposed substantially rearward of the guide wall. At least a part of the fragile portion overlaps the bracket in a rear view,
The vehicle seat according to any one of claims 1 to 3, wherein the airbag module is provided on a back surface of the bracket. The bracket is formed in a plate shape having a main surface facing forward and backward,
The vehicle seat according to any one of claims 1 to 4, wherein a concave portion for accommodating the airbag module is formed forward in the bracket.   The vehicle seat according to claim 5, wherein at least a part of the fragile portion overlaps the concave portion in a rear view.   The vehicle seat according to claim 6, wherein at least a part of the fragile portion overlaps with an upper half portion of the concave portion in a rear view.   The vehicle seat according to claim 6 or 7, wherein a width in the left-right direction of the fragile portion is larger than a width in the left-right direction of the concave portion in rear view. The bracket includes a main portion provided with the recess, a pair of left and right upper tongue pieces extending from the upper edge of the main portion, and extending from the lower portion of the left and right edges of the main portion to the left and right. A pair of left and right lower tongues coupled to the side frame,
The vehicle seat according to claim 8, wherein a width in the left-right direction of the fragile portion is larger than a width in the left-right direction of the main portion in rear view.   The through-hole is formed in the bottom wall of the said recessed part, The said airbag module is fastened by the bottom wall of the said recessed part with the fastener which passes the said through-hole. The vehicle seat according to any one of the items.   6. A through hole is formed in the lower side wall of the recess, and the airbag module is fastened to the lower side wall of the recess by a fastener passing through the through hole. The vehicle seat according to any one of claims 9 to 10. A pad member is provided between the skin member and the bracket,
The vehicle seat according to any one of claims 1 to 11, wherein a slit that penetrates in a thickness direction from the airbag module toward the fragile portion is formed in the pad member. .

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