WO2019031164A1

WO2019031164A1 - Vehicle seat

Info

Publication number: WO2019031164A1
Application number: PCT/JP2018/026674
Authority: WO
Inventors: 仁一田邉
Original assignee: テイ・エステック株式会社
Priority date: 2017-08-07
Filing date: 2018-07-17
Publication date: 2019-02-14

Abstract

Provided is a vehicle seat wherein a gap between an airbag unit that deploys rearwardly and a cover material is eliminated. A seat (1) comprises: left and right side frames (11); a holder (22) that is joined to the corresponding side frames at the left and right ends thereof; an airbag unit (21) that is housed in the holder and deploys rearwardly; and a cover material (8) that is provided with an opening (61) through which the airbag unit is exposed rearwardly. The holder includes a holder body (29) that defines a recessed part (28) and a flange (31) that is provided along an edge of the recessed part. The airbag unit includes a case (41) that is disposed inside the recessed part and is open towards the rear, a lid (42) that closes an opening end of the case and faces the flange along the edge thereof, and an inflator (43) and an airbag (44) that are provided inside the case. An edge of the opening of the cover material extends into the inside of the recessed part via the space between the flange and the lid and is held in place onto the holder body.

Description

Vehicle seat

The present invention relates to a vehicle seat, and more particularly to a vehicle seat provided with a rearward-deployed airbag.

A seat for motor vehicles is known which is provided with an air bag unit which is deployed rearward at the rear of the seat back. A seat of an automobile according to Patent Document 1 is provided on a back surface of a seatback, and is supported by a plate-like seatback garnish provided with an opening and a seatback frame, and is provided outside the seatback garnish through the opening. And a projecting air bag unit.

In a vehicle, a vehicle seat provided with an air bag inside a seat back is known (for example, Patent Document 2). The vehicle seat of Patent Document 2 is provided with a webbing for cleaving the seamed portion of the skin member when the air bag is inflated. The upholstery is connected to the seat back frame via hooks at one end, and is sewn to the skin member constituting the sewn part at the other end. The inflation pressure of the air bag is applied to the suture via the webbing, so that the suture breaks open. The air bag is deployed forward of the side of the seat back through the opening.

Japanese Patent Application Laid-Open No. 6-278512 JP, 2016-210415, A

However, the above-mentioned seat has a problem that a gap is easily generated between the seat back garnish and the air bag unit. When a flexible skin material such as 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 generated, the appearance may be impaired, and the operation of the air bag unit may be impeded by the inclusion of foreign matter or the like.

SUMMARY OF THE INVENTION In view of the above background, the present invention has an object to eliminate a gap between an air bag unit and a skin material, which are deployed rearward, in a vehicle seat.

In order to solve the above-mentioned subject, one mode of the present invention is a vehicle seat (1) which has a seat cushion (3) and a seat back (4), and it is a pair of left and right side frames (11) extended up and down. A seat back frame (6) including, a holder (22) extending left and right and coupled to the corresponding side frame at both left and right ends, and an airbag unit (21) received in the holder and deployed rearward An outer surface of the seat back and a cover material (8) having an opening (61) for exposing the air bag unit to the rear, and the holder is a recess (28) opened to the rear And a flange (31) provided at an edge of the recess in the holder body, the airbag unit being disposed in the recess A case (41) opened rearward, a lid (42) closing the open end of the case and facing the flange at the edge, an inflator (43) provided in the case, and air 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. It features.

According to this aspect, since the edge of the skin material extends inside the holder covered by 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.

In the above aspect, the holder may have at least one reinforcing member provided on the flange, and the holder main body and the flange may be made of resin, and the reinforcing member may be made 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. Thus, the entry of foreign matter into the space between the flange and the lid can be suppressed. In addition, since the rigidity of the holder is improved by the reinforcing member, the air bag unit can be stably supported on the side frame via the holder.

In the above aspect, the reinforcing member may be a plate-like member, and may be disposed inside the flange.

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

In the above aspect, the holder extends along each of a bottom wall, an upper wall, left and right side walls, and a lower wall defining the recess, and boundaries between the upper wall and the left and right side walls, and It is preferable to have a pair of left and right holder weakening portions that extend along the outer peripheral edge of the flange and are torn by the inflation pressure of the air bag, and the reinforcing member is arranged to avoid the holder weakening portions.

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

In the above aspect, the holder fragile portion may have at least one of a plurality of through holes and a plurality of thin portions thinner than the side wall.

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

In the above aspect, the flange may have an insertion hole through which a bolt for fastening the holder to the side frame passes, and the reinforcing member may be disposed to avoid the insertion hole.

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

In the aspect described above, one of the reinforcing members may be provided below the recess in the flange and extend from one of the side frames to the other of the side frames.

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

Further, in the aspect described above, the reinforcing members provided below the recess in the flange may be located rearward of the corresponding side frames at both ends.

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

In the above aspect, the lid is pivotably coupled to the lower edge of the open end of the case, and is torn by the inflation pressure of the airbag to the upper edge and the left and right side edges of the open end of the case. It is good to be connected via the case weak part.

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

The air bag unit needs to be stably supported by the seat back frame in order to support the reaction force of the air bag to be deployed. Moreover, it is preferable that the attachment structure to the seat back frame of an airbag unit is simple, and attachment operation is easy.

Therefore, in a vehicle seat, it becomes an issue to attach the airbag unit deployed rearward to the seat back frame with a simple structure and with high stability.

In order to solve the above-mentioned subject, one mode of the present invention is a vehicular seat (1) provided with a seat cushion (3) and a seat back (4), and a pair of left and right side frames (11) which extend vertically A seat back frame (6) including: a holder (22) extending to the left and right and coupled to the corresponding side frame at both left and right ends; and an airbag unit (21) received in the holder and deployed rearward. And the holder includes a holder body (29) defining a recess (28) opening rearward, and a flange (31) provided on an edge of the recess in the holder body. The air bag unit is disposed in the recess, and a case (41) opened rearward, and the open end of the case is closed, and the flange is opposed to the flange A lid (42) and an inflator (43) and an air bag (44) provided in the case, wherein the case and the holder are mounted on one of the side frames by a first fastening member (74). It is characterized in that it is co-fastened and co-fastened to the other side frame by the second fastening member (75).

According to this aspect, since the airbag unit and the holder are fastened to the left and right side frames, the reaction force of the airbag on which the left and right side frames are deployed can be supported. In addition, since the air bag unit and the holder are fastened together to the side frame by the bolts, the mounting operation can be facilitated.

In the above aspect, the case may have a fastening plate (46D) in contact with the outer surface of the flange, and the case may be fastened together with the flange at the fastening plate to the side frame.

According to this aspect, since the case and the holder are fastened at the fastening plate and the flange located behind the seat back, the fastening operation can be easily performed.

In the above aspect, the flange is formed of a resin, and has left and right insertion holes (34) facing each of the side frames at both left and right ends, and the fastening plate is formed of metal, The first fastening member and the second fastening member may pass through the insertion hole and abut on the side frame, and the first fastening member and the second fastening member may fasten respective portions where the fastening plate and the left and right side frames abut each other.

According to this aspect, since the fastening plate formed of metal directly abuts on the side frame, the air bag unit can be stably supported on the side frame.

In the above aspect, the left and right ends of the flange may be in contact with the rear surface of the corresponding side frame, and the fastening plate may sandwich the flange from front to back with each of the side frames.

According to this aspect, since the fastening plates are disposed behind the left and right side frames, the side frames can stably support the forward reaction force generated by the deployment of the airbag.

In the above aspect, the case may be formed of metal and may have a retainer (46) to which the inflator is coupled, and the fastening plate may be formed by the retainer.

According to this aspect, the load generated on the inflator can be reliably transmitted to the left and right side frames via the retainer including the fastening plate.

In the above aspect, the case has a pair of left and right pins (53) protruding through the holder main body to the left and right, and each of the side frames receives the corresponding pin, and the pins It is good to have a locking hole (25) which controls movement to the front and back direction of.

According to this aspect, the side frame can support the air bag unit with high stability because the number of connection points between the air bag unit and the side frame increases.

In the above aspect, each of the locking holes has a depth toward the left and right outwards, a vertical hole (25A) extending vertically, and a horizontal extending rearward from the vertical hole and opening rearward It is good to have a hole (25B).

According to this aspect, the left and right pins can be simultaneously inserted from the rear into the corresponding locking holes. Thereby, the attachment work of the air bag unit can be facilitated. In addition, since the pin passes through the holder, the holder can be supported by the side frame via the pin.

In the above aspect, the case may be formed of metal and include a retainer (46) to which the inflator is coupled, and each of the pins may be integrally formed with the retainer.

According to this aspect, the load generated on the inflator can be reliably transmitted to the left and right side frames via the retainer and the pin.

In the above aspect, the holder includes a bottom wall (29A), an upper wall (29B), left and right side walls (29C), and a lower wall (29D) defining the recess, and the upper wall and the left and right side walls And a pair of left and right holder weakening portions (35) which extend along each of the boundaries and extend to the outer peripheral edge of the flange and are torn by the inflation pressure of the airbag, and the left and right pins are the left and right side walls It is good to penetrate each of the

According to this aspect, even when the air bag is deployed, the holder can be stably supported on the side frame by the pin.

In the above aspect, the lid is pivotably connected to the lower edge of the open end of the case, and is split by the inflation pressure of the airbag to the upper edge and the left and right side edges of the open end of the case. It may be coupled via the case fragile portion (57).

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

In the above aspect, the case may have a pair of left and right second case weak portions (58) which extend forward from the open end at the left and right ends of the upper portion and are torn by the inflation pressure of the airbag.

According to this aspect, the air bag can be deployed further upward.

In the above aspect, the inflator may be disposed at a lower portion in the case, and the air bag may be disposed above the inflator in the case.

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

In the above aspect, the seatback further includes a surface material (8) which is an outer surface of the seat back and has an opening (61) opposite to the air bag unit, and an edge of the opening of the surface material is It may pass between the flange and the lid, extend into the recess, and be locked to the holder body.

According to this aspect, since the edge of the skin material extends inside the holder covered by the lid, no gap is formed between the skin material and the airbag unit when viewed from the rear.

In order to protect the occupants of the rear seat, an air bag may be provided inside the seat back of the front seat and deployed from the rear to the rear. Also in such a vehicle seat, it is necessary to provide a webbing for cleaving the suture portion.

Therefore, in the vehicle seat in which the air bag deployed rearward is accommodated inside the seat back, it becomes an issue to easily connect the webb to the seat back frame.

In order to solve the above-mentioned subject, it is a vehicle seat (101) provided with a seat cushion (103), a seat back (104), and a headrest (105), and the above-mentioned seat back is a seat back frame (107). It has an air bag module (150) supported by the seat back frame, and a skin member (109) covering the seat back frame and the air bag module from the back, and extends vertically on the top of the seat back frame A tubular guide stay (122) is coupled, a headrest guide (190) for supporting the headrest is inserted into the guide stay, and an air bag (151) is formed at a position corresponding to the air bag module of the skin member. ) Forms a fragile part (175) to be opened, A first force cloth (181) is provided which has a through hole (183) into which at least one of the guide stay and the headrest guide is inserted at one end and the other end is connected at the other end to the skin member near the fragile portion. It is characterized by

According to this aspect, by providing the through-hole for inserting at least one of the guide stay and the headrest guide in the first strength cloth, the first strength cloth can be easily coupled to the seat back frame.

In the aspect described above, the first webbing is disposed on the upper side of the guide stay at a position where the through hole is aligned with the guide stay, and the headrest guide passes through the through hole to the guide stay. When fitted, the headrest guide has an outwardly extending flange portion (192) at the upper edge, and the first force cloth is sandwiched between the upper end of the guide stay and the flange portion Good.

According to this aspect, since the headrest guide passes through the through hole and the first force cloth is sandwiched between the upper end of the guide stay and the flange portion, the first force cloth and the seat back frame are coupled Can be strengthened.

In the above aspect, the seat back frame includes a pair of left and right side frames (111) extending vertically and an upper frame (112) connecting the upper ends of the side frames, and the guide stay includes the guide stay A pad member (108) provided with a receiving hole (167) for penetrating the guide stay is provided above the upper frame and coupled to the upper frame and extending above the upper frame; The force cloth is disposed on the upper surface of the pad member so that the guide stay passes through the through hole, and the headrest guide is fitted into the guide stay from above the pad member and the first force cloth, The guide (190) has a flange portion (192) extending outward along the surface of the pad member. And, may first webbing is sandwiched between the upper surface of the pad member and the flange portion.

According to this aspect, since the guide stay passes through the through hole and the first force cloth is held between the flange portion and the pad member, the connection between the first force cloth and the seat back frame is strengthened. Can be

In the above aspect, the airbag module is coupled to the seat back frame via the upper frame and the bracket (131) coupled to the both side frames, one end of which is latched to the bracket, and the other A second webbing (182) may be provided, the end of the second webbing (182) being coupled to the end of the first webbing through the frangible portion in the vicinity of the frangible portion of the skin member.

According to this aspect, since the second elastic cloth is provided, the inflation pressure of the air bag can be easily transmitted to the fragile portion.

Further, in the above aspect, the seat back frame includes a pair of left and right (111) extending upward and downward, and an upper frame (112) connecting the upper ends of the side frames, and the guide stay is the upper The first webbing is disposed below the upper frame so that the guide stay passes through the through hole, and the outer periphery of the guide stay is disposed below the first webbing. Preferably, the support member (200) is coupled, and the first webbing is held between the upper frame and the support member.

According to this aspect, since the guide stay passes through the through hole and the first force cloth is held between the upper frame and the support member, the connection between the first force cloth and the seat back frame is strengthened. Can be

In the above aspect, the air bag module is coupled to the support member, the support member is coupled to the seat back frame, one end is hooked to the support member, and the other end is the skin member. In the vicinity of the fragile portion, a second webbing (182) coupled to an end of the first webb and a position opposite to the first webbing via the stitching portion may be provided.

Further, in the above aspect, the seat back frame includes a wire wound around the side frames, and the support member is coupled to the wire at a lower end and is coupled to a lower portion of the guide stay at an upper end. It is good.

According to this aspect, the support member can be coupled to the seat back frame.

In the above aspect, it is preferable that a pad member (166) be disposed between the second webbing and the skin member.

According to this aspect, since the pad member is disposed on the back of the seat back, the back of the seat back can be softened.

In the above aspect, it is preferable that a reinforcing member (184) be coupled along the peripheral edge portion of the through hole.

According to this aspect, it is possible to prevent the first webbing from being damaged starting from the through hole.

When the occupant in the rear seat moves forward due to a frontal collision or the like, the head of the occupant in the rear seat may collide with the upper rear end of the front seat.

Therefore, in a vehicle seat provided with an air bag, it becomes an issue to deploy the air bag from the rear upper end of the seat back.

In order to solve the above-mentioned subject, it is a vehicle seat (101) provided with a seat cushion (103) and a seat back (104), and the above-mentioned seat back is a seat back frame (107), a support member (131, 200) an airbag module (150) coupled to the seatback frame, a pad member (108) covering the seatback frame, the support member, and the airbag module from above and behind, and the pad member And a fragile portion (175) to be opened by inflation of the air bag (151) at a portion corresponding to the upper end of the back surface of the seat back of the skin member. A slit (168) connecting the air bag and the fragile portion is formed in the pad member And wherein the door.

According to this aspect, since the fragile portion is provided at the upper rear end of the seatback, the airbag can be deployed from the upper rear end of the seatback. In addition, since the slit and the fragile portion are disposed at the diagonally upper rear with respect to the airbag module, the airbag can be deployed diagonally upward from the upper rear end of the seatback.

In addition, the seat back frame includes a pair of left and right side frames (111) extending vertically and an upper frame (112) connecting upper ends of the both side frames to each other, and the support member includes the both side frames And the upper frame.

According to this aspect, the airbag module can be firmly coupled to the seat back frame.

In the above aspect, the seat back frame includes a pair of left and right side frames (111) extending vertically, an upper frame (112) connecting the upper ends of the two side frames to each other, and the two side frames. A tubular guide stay (122) coupled to the upper frame and extending vertically is coupled to the upper frame, and a headrest pillar (194) is coupled to the upper frame. A headrest guide (190) for receiving the light guide member, the guide stay protrudes downward of the upper frame, and the upper edge of the support member is formed with a downward receiving recess (206); And the guide stay is fitted in the receiving recess at the upper edge to It may is bonded to the stay.

According to this aspect, the upper portion of the support member can be easily coupled to the seat back by fitting the guide stay in the receiving recess.

In the above aspect, the air bag module is provided on the lower side of the air bag and has an inflator (152) for expanding the air bag, and the support member has a guide surface (145) facing substantially in the rear direction. The air bag may be disposed rearward of the guide surface.

According to this aspect, the guide surface can guide the airbag to be deployed rearward or upward.

In the above aspect, the support member may have a recessed portion (141) recessed forward in the lower side of the guide surface, and the inflator may be accommodated in the recessed portion.

According to this aspect, it is possible to suppress the amount of rearward projection of the seat back of the inflator.

In the above aspect, the bracket has an edge wall (146) extending rearward of the guide surface at the lower end of the bracket, the edge wall defining a lower wall (144) defining a lower portion of the recess. The inflator may be fastened to the upper surface of the edge wall.

According to this aspect, since the fastening portion of the inflator can be disposed to extend vertically, the amount of protrusion of the seat back in the front-rear direction can be suppressed.

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

According to the aspect in which the reinforcing member is provided to the flange, since the deformation of the flange is suppressed by the reinforcing member, the spread between the flange and the lid can be suppressed. Thus, the entry of foreign matter into the space between the flange and the lid can be suppressed. In addition, since the rigidity of the holder is improved by the reinforcing member, the air bag unit can be stably supported on the side frame via the holder.

According to the aspect in which the reinforcing member is disposed inside the flange, the reinforcing member can be stably coupled to the flange.

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

According to the aspect in which the reinforcing member is disposed avoiding the holder fragile portion, the reinforcing member can be disposed so as not to inhibit the deployment of the airbag.

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

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

According to the aspect in which one of the reinforcing members extends from one side frame to the other side frame, the reinforcing members can support the holder on the left and right side frames with high stability.

According to the aspect in which the reinforcing member provided below the recess in the flange is positioned at the both ends behind the corresponding side frame, the forward reaction force generated by the deployment of the airbag is supported by the side frame via the reinforcing member. It can be done.

The lid is pivotably connected to the lower edge of the open end of the case, and is connected to the upper edge and the left and right side edges of the open end of the case via a fragile portion of the case which is torn by the inflation pressure of the air bag. According to this, the air bag can be deployed upward and backward.

According to one aspect of the present invention, since the airbag unit and the holder are fastened to the left and right side frames, the reaction force of the airbag on which the left and right side frames are deployed can be supported. In addition, since the air bag unit and the holder are fastened together to the side frame by the bolts, the mounting operation can be facilitated.

According to the embodiment in which the case has a fastening plate that abuts the outer surface of the flange and the case and the holder are fastened at the fastening plate and the flange, the case and the holder are fastened at the fastening plate and the flange located behind the seatback Therefore, the fastening operation can be easily performed.

A fastening plate formed of metal passes through the insertion hole of the flange formed of resin and abuts on the side frame, and a portion where the first fastening member and the second fastening member abut on each other According to the fastening mode, the air bag unit can be stably supported on the side frame.

According to the aspect in which the left and right ends of the flanges abut the corresponding rear surfaces of the side frames, and the fastening plates sandwich the flanges from the front and rear between the side frames, the fastening plates are disposed behind the left and right side frames Therefore, the side frame can support the forward reaction force generated by the deployment of the air bag with high stability.

According to the aspect in which the case is formed of metal and has a retainer to which the inflator is coupled, and the fastening plate is formed by the retainer, the load generated on the inflator is transferred to the left and right side frames via the retainer including the fastening plate. It can be transmitted reliably.

According to the aspect in which the case has a pair of left and right pins and each side frame has a locking hole for receiving the corresponding pin, the number of connection points between the airbag unit and the side frame is increased. The unit can be stably supported.

According to an embodiment, each of the locking holes has a depth toward the left and right outwards, and includes a vertical hole extending vertically and a horizontal hole extending rearward from the vertical hole and opening rearward. The left and right pins can be simultaneously inserted from the rear into the corresponding locking holes. Thereby, the attachment work of the air bag unit can be facilitated. In addition, since the pin passes through the holder, the holder can be supported by the side frame via the pin.

According to the aspect in which the case is formed of metal and has the retainer to which the inflator is coupled, and each of the pins is integrally formed with the retainer, the load generated on the inflator is through the retainer and the pin side frames Can be transmitted reliably.

According to the embodiment in which the holder has a pair of left and right holder fragile portions and the left and right pins pass through each of the left and right side walls, the pins are supported by the pins with high stability on the side frame even when the airbag is deployed. It can be done.

According to the aspect in which the lid is coupled to the case via the first case fragile portion, the air bag can be deployed upward and backward.

According to the aspect in which the case has the pair of left and right second case fragile portions, the air bag can be expanded further upward.

According to the aspect in which the air bag is disposed above the inflator in the case, the air bag can be deployed upward and backward.

According to the aspect in which the edge of the hole of the skin material passes between the flange and the lid and extends into the recess and is locked to the holder main body, the edge of the skin material is the inside of the holder covered with the lid As a result, no gap is formed between the skin material and the airbag unit as viewed from the rear.

According to one aspect of the present invention, in the vehicle seat accommodating the airbag deployed rearward inside the seat back, the first force cloth is provided with the through hole for inserting at least one of the guide stay and the headrest guide. Thus, the webbing can be easily coupled to the seat back frame.

According to the aspect in which the headrest guide passes through the through hole and the first force cloth is sandwiched between the upper end of the guide stay and the flange portion, the connection between the first force cloth and the seat back frame is made firm can do.

According to the aspect in which the guide stay passes through the through hole and the first force cloth is sandwiched between the flange portion and the pad member, the connection between the first force cloth and the seat back frame is strengthened. Can.

According to the aspect in which the second webbing is provided, the inflation pressure of the air bag can be easily transmitted to the fragile portion.

According to the aspect in which the guide stay passes through the through hole and the first force cloth is sandwiched between the upper frame and the support member, the connection between the first force cloth and the seat back frame is strengthened. Can.

According to the embodiment, the seat back frame includes a wire wound around both side frames, and the support member is coupled to the wire at the lower end and to the lower portion of the guide stay at the upper end. It can be combined.

According to the aspect in which the pad member is disposed on the back of the seatback, the back of the seatback can be softened.

According to the aspect in which the reinforcing member is joined along the peripheral edge portion of the through hole, it is possible to prevent the first force cloth from being damaged starting from the through hole.

According to one aspect of the present invention, in the vehicle seat provided with the airbag, since the fragile portion is provided at the upper rear end of the seatback, the airbag can be deployed from the upper rear end of the seatback.

According to the aspect in which the bracket is coupled to the upper frame and both side frames, the airbag module can be firmly coupled to the seat back frame.

According to the aspect in which the guide stay is fitted in the receiving recess, the upper portion of the support member can be easily coupled to the seat back.

According to the aspect in which the support member has a guide surface facing substantially rearward in the front of the airbag, the guide surface can guide the airbag to be deployed rearward or upward.

According to the aspect in which the inflator is accommodated in the recess, the amount of rearward projection of the seat back can be suppressed.

According to the aspect in which the inflator is fastened to the edge wall, the inflator can be disposed to extend vertically, so that the amount of protrusion of the seat back in the front-rear direction can be suppressed.

It is a side view of the seat concerning a 1st embodiment, and the figure showing the state where the air bag was developed Rear view of the seat according to the first embodiment Rear view of the seat back frame and the airbag unit (rear view of the seat with the skin and pad omitted) An exploded perspective view of an air bag unit and a holder Perspective view of the retainer Perspective view of wall member Perspective view of support plate and locking portion of side frame VIII-VIII sectional view of FIG. 2 IX-IX sectional view of FIG. 2 Sectional view of an airbag unit and a holder at the time of deployment of the airbag Explanatory drawing which shows expansion | deployment of the airbag in the vehicle seat which concerns on 2nd Embodiment. Rear view of the vehicle seat Rear view of vehicle seat frame IV-IV sectional view of FIG. 13 Top view of the headrest guide portion of the vehicle seat Cross-sectional view of a vehicle seat according to a third embodiment Rear view of frame of vehicle seat according to the third embodiment Cross-sectional view of a vehicle seat according to a fourth embodiment Cross-sectional view of a vehicle seat according to the fifth embodiment

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

<< First Embodiment >>
As shown in FIG. 1, a seat 1 according to the present invention is provided in a front row of a car. The seat 1 includes a seat cushion 3 provided on a floor of a vehicle via a slide rail 2, a seat back 4 rotatably supported at the rear of the seat cushion 3, and a headrest provided at an upper portion of the seat back 4. And five.

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 (see FIG. 8) supported by the seat back frame 6, and the pad member 7. And a skin material 8 which constitutes the outer surface of the housing 4.

The seat back frame 6 is vertically coupled to a pair of left and right side frames 11 and an upper frame 12 extending to the left and right and coupled to the upper ends of the left and right side frames 11, and coupled to a lower portion of the left and right side frames 11. A lower frame 13 and a cross frame 14 extending left and right between the upper frame 12 and the lower frame 13 and coupled to the left and right side frames 11 are provided.

The upper portion of each side frame 11 and the upper frame 12 are formed by bending one pipe member 16. The pipe member 16 has a middle portion which extends leftward and rightward to constitute the upper frame 12 and left and right end portions which extend downward and which constitute upper portions 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 material 16 at the upper end. Each side frame 11 is pivotably connected to the rear end of a seat cushion frame (not shown) that forms the framework of the seat cushion 3 at its lower end.

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

An air bag unit 21 and a holder 22 for supporting the air bag unit 21 are coupled to the left and right side frames 11. Specifically, the air bag unit 21 and the holder 22 are coupled to the support plate 23 and the holder locking portion 24 provided on each of the left and right side frames 11.

As shown in FIGS. 3 and 7, the left and right support plates 23 are provided at the rear edges of the left and right side frames 11 and project in directions approaching each other. Each support plate 23 has a surface facing in the back and forth direction. The support plate 23 is constituted by an edge portion of a sheet metal member 17 which constitutes a lower portion of the side frame 11. In another embodiment, the support plate 23 may be a plate connected to the pipe member 16 or the sheet metal member 17.

The left and right holder locking portions 24 are provided above the support plate 23 at the inner side 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 includes a rear plate 24A extending in a direction approaching each other from the side frames 11 and a side plate 24B extending forward from the projecting end of each rear plate 24A. Have. The surface of the back plate 24A is directed to the front and the back, and the surface of the side plate 24B is directed to 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 25A and a horizontal hole 25B, and is L-shaped as viewed in the left-right direction. The vertical hole 25A penetrates the side plate 24B in the thickness direction and extends vertically. The lateral hole 25B penetrates the side plate 24B in the thickness direction, extends rearward from the lower end of the vertical hole 25A, and penetrates the rear plate 24A to open rearward. The open end of the lateral hole 25B in the rear plate 24A is formed so that the vertical width at the side plate 24B side is narrower than the vertical width at the side opposite to the side plate 24B side. The pin locking hole 25 is a hole having a depth outward in the left and right direction.

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

The holder 22 has a flange 31 provided at 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 rear edge of the holder body 29) and is formed in a frame shape. The flange 31 has an upper side 31A extending leftward and rightward along the holder upper wall 29B, left and right side sides 31B extending vertically along the left and right holder side walls 29C, and a lower side extending horizontally along the holder lower wall 29D. And 31C. 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, a plurality of reinforcing members 32 are formed of metal plate members. Each reinforcing member 32 is disposed inside the flange 31. The flange 31 may be formed by insert molding so as to include the reinforcing member 32 therein. Each reinforcing member 32 is disposed in parallel with the flange 31 and faces in the front and back direction.

In the present embodiment, the reinforcing member 32 is formed of four linearly extending plate pieces, and is disposed on each of the upper side 31A, the left and right side 31B, and the lower side 31C. Each reinforcing member 32 is disposed apart from one another and is disposed to avoid the four corners of the flange 31. That is, each reinforcing member 32 has both left and right ends of lower side 31C (connections between lower side 31C and left and right sides 31B) and left and right ends of upper side 31A (upper side 31A and left and right sides) It is arrange | positioned in the part except the connection part with the part 31B.

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

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

As shown in FIG. 4 to FIG. 6 and FIG. 8, the airbag unit 21 includes a case 41 disposed in the recess 28 and opened rearward, a lid 42 closing the open end of the case 41, and the inside of the case 41. And an air bag 44. 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 is directed to the front and back, a retainer lower plate 46B extending rearward from the lower edge of the retainer front plate 46A and the surface directed to the top and bottom, and a retainer front plate 46A. It has a left and right retainer side plate 46C extending rearward from the left and right side edges and the surface facing left and right, and a fastening plate 46D extending downward from the rear edge of the lower retainer plate 46B and facing the 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 tube shape opened in the front and rear direction, and has a case upper wall 47A, left and right case side walls 47B, and a case lower wall 47C. The left and right case side walls 47B are disposed along the inner side surfaces of the corresponding left and right retainer side plates 46C, and the case lower wall 47C is disposed 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 the left and right retainer side plates 46C, the retainer lower plate 46B, and 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 opened rearward.

As shown in FIG. 5, pins 53 project from the upper portions of the outer side surfaces of the left and right retainer side plates 46C substantially perpendicularly to the retainer side plates 46C. The left and right pins 53 are formed in a cylindrical shape and arranged coaxially with each other. At the tip of each pin 53, a disc-like locking piece 53A is coaxially provided.

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

As shown in FIG. 6, the lid 42 is in the form of a plate whose surface faces back and forth, and is connected to the rear end of the wall member 47 at the front surface. The rear edge of the case lower wall 47C and the lid 42 are swingably connected to each other. The rear edge 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 lower tensile strength than any of the wall member 47 and the lid 42.

In the present embodiment, the wall member 47 and the lid 42 are integrally formed of resin. The first case fragile portion 57 may be a thin portion thinner than the wall member 47 and the lid 42. Further, the first case fragile portion 57 may have a groove or a plurality of through holes intermittently arranged in a row. In order to enable swinging of the lid 42 with respect to the case lower wall 47C, it is preferable that the boundary between the rear edge of the case lower wall 47C and the lid 42 be formed thin relative to other portions.

At the left and right ends of the case upper wall 47A, there are formed second case fragile portions 58 which extend back and forth and reach the rear edge of the case upper wall 47A. Each second case fragile portion 58 preferably extends to the front edge of the case upper wall 47A. The second case fragile portion 58 is formed to have lower tensile strength than any of the wall member 47 and the lid 42. The second case fragile portion 58 may be a thin portion thinner than the case upper wall 47A and the left and right case side walls 47B. The second case fragile portion 58 may have a groove or a plurality of through holes intermittently arranged in a row.

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

As shown in FIG. 8, the inflator 43 is a device that generates a gas for inflating the air bag 44 and has a tubular outer shape. The inflator 43 is disposed in the lower portion of the case 41 so as to extend leftward and rightward. The inflator 43 is fastened by bolts to the case lower wall 47C of the retainer 46.

The air bag 44 is a bag and is connected to the inflator 43. The air bag 44 is formed in an arc shape that is convex upward at the time of deployment, and is connected to the inflator 43 at its proximal end, and its tip end is located rearward with respect to the inflator 43. In the initial state, the air bag 44 is folded and disposed in the case 41 above the inflator 43. After the inflator 43 and the air bag 44 are disposed on the retainer 46, the wall member 47 integral with the lid 42 is attached to the retainer 46, whereby the inflator 43 and the air bag 44 are provided inside the case 41.

The surface material 8 forms the back surface of the seat back 4 and has an opening 61 for exposing the air bag unit 21 to the rear at a portion forming the back surface. The opening 61 is formed in a rectangular shape long in the left and right direction corresponding to the recess 28. The aperture 61 is formed smaller than the open end of the recess 28 and has a slit at the boundary between the upper edge, the left and right side edges, and the lower edge. Hooks 62 are connected to the upper edge, the left and right side edges, and the lower edge of the opening 61 by sewing or the like. In 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, a skin retaining hole 64 penetrating in the thickness direction is formed. The upper edge, the left and right side edges, and the lower edge of the aperture 61 extend into the recess 28 and are hooked to the corresponding skin retaining holes 64 by the hooks 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, pin insertion holes 66 penetrating in the thickness direction are formed in the left and right holder side walls 29 </ b> C of the holder 22. When the case 41 is received in the recess 28, the left and right pins 53 pass through 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 surface material 8 is present at a position facing the pin insertion hole 66, it is preferable that the surface material 8 be formed with a through hole through which the pin 53 can pass. Further, elastic claws 67 protruding from the upper surface of the case upper wall 47A are formed in the locking holes 68 formed on the lower surface of the holder upper wall 29B. The air bag unit 21 and the holder 22 are temporarily fixed to each other by inserting the pin 53 into the pin insertion hole 66 and locking the elastic claw 67 to the locking hole 68. 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 protrude into the corresponding flange side insertion holes 34.

As shown in FIG. 7, the left and right pins 53 are received in the vertical holes 25A of the corresponding left and right pin locking holes 25. Thereby, the movement of the left and right pins 53 and the airbag unit 21 in the front-rear direction is restricted.

As shown in FIG. 9, with the left and right pins 53 received in the corresponding vertical holes 25 A of the corresponding pin locking holes 25, the projecting ends of the left and right bulges 55 are support plates for the left and right side frames 11. It abuts on the rear face of the seat. 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. Weld nuts 72 are welded to the front surfaces of the support plates 23 at positions corresponding to the second bolt holes 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 to the weld nut 72 on the left side, whereby 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 to the weld nut 72 on the left side, whereby the right end of the fastening plate 46D is the left and right side Is fastened to the support plate 23 of the The flange 31 is held by the left end of the fastening plate 46D at the left end and the support plate 23 at the left, and is held by the right end of the fastening plate 46D at the right end and the support plate 23 on the right. Thus, the case 41 and the holder 22 are fastened together to the left side frame 11 by the first bolt 74 and fastened together to the right side frame 11 by the second bolt 75.

When the air bag 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 can not move up and down in the vertical hole 25A. It can not separate from the vertical hole 25A. In this state, the movement of the left and right pins 53 is restricted by coming into contact with the front and rear edges of the vertical hole 25A. In addition, the locking pieces 53A provided at the tip of each pin 53 abut on the front and rear edges of the corresponding vertical hole 25A from the left and right, thereby restricting the movement of the pin 53 in the left and right direction. Thus, the airbag unit 21 and the holder 22 are engaged by the left and right fastening parts by the first bolt 74 and the second bolt 75 and the pins 53 and the pin locking holes 25 disposed above the left and right fastening parts. It is stably supported by the left and right side frames 11 by the structure.

In a state where the air bag 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 31C has a left end located behind the support plate 23 on the left and a right end supporting the right Located behind the plate 23. That is, viewed from the rear, the reinforcing member 32 provided on the lower side 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 air bag unit 21 to the seat back frame 6, the holder 22 is first disposed inside the surface material 8 attached to the seat back frame 6, and the edge of the opening 61 of the surface material 8 is placed on the holder 22. Hang up the department. Next, the air bag 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 air bag unit 21 and the holder 22 forward, the left and right pins 53 are inserted from the rear end of the corresponding horizontal hole 25 B of the pin locking hole 25, and then the air bag unit 21 and the holder The pins 22 are moved to the upper ends of the corresponding vertical holes 25A by moving the pins 22 upward. As a result, the left and right bulging portions 55 face the corresponding support plates 23, and the first bolt holes 56 and the second bolt holes 71 align with each other. Next, the first bolt 74 and the second bolt 75 are inserted into the first bolt hole 56 and the second bolt hole 71, and screwed onto the weld nut 72, whereby the air bag unit 21 and the holder 22 are formed on the left and right side frames. Signed at 11. Thus, the holder 22 and the airbag unit 21 are attached to the seat back frame 6.

Next, the operation at the time of deployment of the air bag 44 will be described. When a vehicle collision is detected by the in-vehicle device, 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 air bag 44, and the air bag 44 is inflated. When the air bag 44 inflates, 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 cleaved, and the upper portion 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 inflation pressure of the air bag 44 through 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 31A of the flange 31 move upward with respect to the initial position. As a result, a passage extending rearward and upward between the lid 42 and the case upper wall 47A is formed, and the air bag 44 is deployed rearward and upward.

In the seat 1 according to the present embodiment, since the edge of the surface material 8 extends inside the holder 22 covered by the lid 42, a gap is formed between the surface material 8 and the airbag unit 21 when viewed from the rear. It can be prevented from being formed. Further, since the deformation of the flange 31 is suppressed by the reinforcing member 32, the spread between the flange 31 and the lid 42 is suppressed. Thereby, the approach of the foreign material between the flange 31 and the lid 42 can be suppressed. Further, since the rigidity of the holder 22 is improved by the reinforcing member 32, the air bag unit 21 can be stably supported by the side frame 11 via the holder 22.

Since the reinforcing member 32 is disposed so as to avoid the holder fragile portion 35, the holder 22 can be cleaved 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 disposed 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 disposed 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. The side frame 11 can stably support the reaction force via the reinforcing member 32.

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

Since the bulging portion 55 of the fastening plate 46D passes through the flange side insertion hole 34 and abuts on 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 connection points between the air bag unit 21 and the side frame 11 increases, and the air bag unit 21 is attached to the side frame 11. The stability can be supported well. Since the left and right pin locking holes 25 are opened rearward by the lateral holes 25B, the left and right pins 53 can be locked in the left and right pin locking holes 25 by a simple operation. The left and right pins 53 pass through the left and right holder side walls 29C of the holder 22, so that the case 41 and the holder 22 can be temporarily fixed to each other.

<< Second Embodiment >>
As shown in FIG. 11, the vehicle seat 101 of the second embodiment according to the present invention constitutes the front seat of the first row of the vehicle. As shown in FIGS. 11 and 12, the vehicle seat 101 includes a seat cushion 103 provided on a floor 102 of a car, a seat back 104 supported at the rear of the seat cushion 103, and an upper portion of each seat back 104. The headrest 105 is provided on the

As shown in FIG. 12, the seat back 104 is provided on the surface of the seat back frame 107 as a skeleton, the pad member 108 supported by the seat back frame 107, and the surface of the pad member 108. It has the skin member 109 which comprises, and the backboard 110 which comprises the rear part of the seat back 104. FIG.

The seat back frame 107 includes a pair of left and right side frames 111 extending vertically, an upper frame 112 extending to the left and right and coupled to respective upper ends of the left and right side frames 111, and a pair of left and right side frames 111 extending to the left and right. And a lower frame 113 coupled to the lower portion. The upper side frame portions 114 and the upper frame 112 constituting the upper portions of the left and right side frames 111 are formed by bending one circular pipe material into an inverted U-shaped gate shape. In addition, each side frame lower portion 115 constituting the lower portion of each side frame 111 is formed of a sheet metal member welded to both ends of the pipe material. The pressure receiving wires 116 are vertically bridged on the left and right side frames 111. The pressure receiving wires 116 are each formed of a metal rod member. On the front side of the pressure receiving wire 116, a plate-like pressure receiving member 117 that supports the occupant's back in a retractable manner is connected.

The upper portion of the seat back frame 107 is formed by the upper frame 112 and the left and right side frame upper portions 114, and has a substantially trapezoidal shape in a rear view.

The upper frame 112 has a flat front side surface 121 on the front side of the middle portion on the left and right. The front side surface 121 is formed by compressively deforming a circular pipe material so as to have a semicircular cross section. A pair of left and right guide stays 122 are welded to the front side surface 121. Each guide stay 122 is formed in the shape of a square tube whose both ends are open. The guide stays 122 have their respective axes extending substantially in the vertical direction, and are arranged at intervals in the left and right direction.

A bracket 131 is coupled to both side frames 111 and the upper frame 112. The bracket 131 is located in the upper half of the seat back frame 107. The bracket 131 is generally in the form of a plate facing in the front-rear direction. The bracket 131 is formed of a single plate member drawn from one sheet metal, and has a substantially trapezoidal shape in which the width in the left-right direction narrows upward in the rear view. The bracket 131 is welded to the upper frame 112 at two places separated to the left and right of the upper edge. The bracket 131 is welded to both side frames 111 at each of the left and right edges.

The bracket 131 is formed with a recess 141 that is recessed forward. The recess 141 is formed to extend leftward and rightward along the lower edge of the bracket 131. The recess 141 is defined by a bottom wall 142 facing rearward, an upper wall 143 facing downward, a lower wall 144 facing upward, and left and right side walls, and has a substantially rectangular parallelepiped shape extending laterally in a rear view. On the upper side of the recess, a guide surface 145 that faces substantially in the rear is formed on the bracket 131. The guide surface 145 extends upward from the opening edge of the recess 141 and reaches the upper edge of the bracket 131.

The bracket 131 is provided with an edge wall 146 extending rearward along the lower edge and extending leftward and rightward. The edge wall 146 is located behind the guide surface 145, more specifically, behind a virtual surface obtained by extrapolating the guide surface 145 vertically and horizontally. In the present embodiment, the edge wall 146 and the lower wall 144 are formed at the same height and continuously form one wall.

An air bag module 150 is coupled to the bracket 131. The air bag module 150 includes an air bag 151 and an inflator 152 which releases gas to the inside of the air bag 151 and inflates the air bag 151.

The inflator 152 has a substantially cylindrical shape and is provided with a male screw portion 153 projecting radially outward. A through hole is formed in the edge wall 146, and the inflator 152 is fastened to the edge wall 146 by inserting the male screw portion 153 through the through hole in the edge wall 146 and coupling a nut 155. At this time, a part of the inflator 152 is accommodated inside the recess 141. The male screw portion 153 is arranged to extend substantially vertically along the side frame 111, and therefore does not protrude toward the occupant. Furthermore, the nut 155 can be easily coupled to the male screw portion 153.

The air bag 151 is disposed on the upper side of the inflator 152 in a folded state. The air bag 151 is located rearward of the guide surface 145.

The pad member 108 is formed of a flexible cushioning material such as polyurethane foam. The pad member 108 has a front surface portion forming a backrest surface 160 facing the back of the occupant, an upper surface portion 162 extending rearward from an upper edge of the front surface portion, a side surface portion extending rearward from left and right side edges of the front surface portion, and an upper surface And a rear surface portion 164 extending downward from the rear end of the portion 162. The front surface portion, the upper surface portion 162, and the side surface portion are formed by the first pad member 165 which is integrated, and the rear surface portion is formed by the second pad member 166 which is separate from the first pad member.

The front surface portion extends vertically and has a substantially rectangular plate shape having a predetermined thickness in front and back. The front surface portion abuts on the front surfaces of the side frames 111, the upper frame 112, and the pressure receiving member 117 on the rear surface.

The top surface portion 162 extends rearward from the upper edge of the front surface portion to the rear edge of the upper frame 112 in a side view. The upper surface portion 162 is formed with a pad through hole 167 vertically penetrating at a portion corresponding to the upper ends of the left and right guide stays 122. A corresponding guide stay 122 is inserted into each pad through hole 167.

The side surface portions respectively extend from the left and right side edges of the front surface portion to the rear of the side frame 111 along the left and right outer surfaces of the side frame 111.

The rear surface portion 164 extends downward from the rear end of the upper surface portion 162 more than the lower end of the bracket 131. Since the upper surface portion 162 is formed on the first pad member 165 and the rear surface portion 164 is formed on the second pad member 166 independent of the first pad member 165, the rear surface portion 164 and the rear surface portion 164 It is separated from the top. A gap 168 (hereinafter referred to as a slit) is formed between the upper surface portion 162 and the rear surface portion 164. The slit 168 is located at the upper rear end of the seat back 104.

As shown in FIGS. 13 and 14, the skin member 109 is formed by stitching a plurality of sheet materials such as cloth and leather. The skin member 109 includes a front sheet covering the surface of the front, a side sheet 172 covering the left and right sides of the left and right sides, an upper sheet 173 covering the upper surface 162, and a rear face and a rear of the side And a rear sheet material 174 covering the rear surface of the surface portion 164. Upper edge of the front sheet material and front edge of the upper sheet material 173, left and right side edges of the front sheet material and front edge of the side sheet material 172, and upper edge and upper sheet material 173 of the side sheet material 172 The left and right side edges are sewn together.

The upper end of the rear sheet material 174 and the rear end of the upper sheet material 173 are sewn together to form a suture portion 175. The sutured portion 175 functions as a fragile portion in the skin member 109 that breaks with a smaller load than other sutured portions. The suture portion 175 is located at the upper rear end of the seat back 104, more specifically, at the rear end of the slit 168. The suture portion 175 and the air bag module 150 are connected by the slit 168. The left and right ends of the rear sheet material 174 may be detachably coupled to the rear edge of the side sheet material 172 using slide fasteners or the like.

The backboard 110 is a plate-like member made of resin, and has a substantially rectangular shape extending vertically. A hook (not shown) is provided on the front surface of the backboard 110. A hook wire (not shown) is stretched around the left and right side frame upper parts 114. The hooking wire is formed of a metal rod-like member bent into a predetermined shape. The back board 110 is coupled to the seat back frame 107 by hooks being hooked to the hooking wires. The backboard 110 abuts on the lower edge of the rear sheet material 174 at the top and the rear edge of the side sheet material 172 on the left and right sides, and is arranged to cover the seatback frame 107 from the rear.

The skin member 109 is provided with a first force cloth 181 and a second force cloth 182. The first force cloth 181 and the second force cloth 182 are each formed of a sheet-like member that is less stretchable than the skin member 109.

One end side of the first web 181 is sewn to the rear edge of the upper sheet material 173. The first webbing 181 has a through hole 183 at the other end.

As shown in FIGS. 14 and 15, a plate-shaped reinforcing member 184 is disposed below the first force cloth 181. The reinforcing member 184 has a through hole 185 and is annular. The reinforcing member 184 may be made of resin. The reinforcing member 184 is disposed below the first force cloth 181 so as to be sewn to the first force cloth 181 so that the through holes 183 of the first force cloth 181 and the through holes 185 of the reinforcement member 184 are aligned. There is. The reinforcing member 184 may be disposed on the upper side of the first force cloth 181.

The first force cloth 181 is placed on the upper surface of the first pad member 165, more specifically, on the upper surface of the upper surface portion 162. The guide stay 122 passes through the through hole 183 of the first force cloth 181 and the through hole 185 of the reinforcing member 184. An upper sheet material 173 is placed on the upper surface of the first force cloth 181. A through hole 187 is formed in the upper sheet member 173 at a position corresponding to the guide stay 122, and the guide stay 122 passes through the through hole 187 of the upper sheet member 173.

A headrest guide 190 is inserted into the guide stay 122. The headrest guide 190 has a cylindrical portion 191 fitted to the guide stay 122, and a flange portion 192 protruding laterally from the upper end of the cylindrical portion 191. The upper sheet material 173, the first force cloth 181, and the reinforcing member 184 are sandwiched between the flange portion 192 and the first pad member 165.

The headrest 105 includes a headrest main body 193 and a pair of left and right headrest pillars 194 projecting from the headrest main body 193. The headrest pillar 194 is fitted into the tubular portion 191. The headrest 105 is guided by the cylindrical portion 191 so as to be displaced along the axial direction of the cylindrical portion 191. The flange portion 192 is provided with locking means (not shown) for fixing the insertion position of the headrest pillar 194 with respect to the cylindrical portion 191. The headrest 105 is fixed at a predetermined position by locking means.

A plurality of hooks 195 which are J-shaped hook members are connected to one end side of the second webbing 182. The edge wall 146 is formed with a vertically extending through hole (not shown) extending to the left and right, and the hooks 195 are hooked in the through hole. The second webbing 182 extends upward along the rear edge of the rear surface portion 164 and reaches near the lower side of the suture portion 175. The other end of the second web 182 is sewn to the upper edge of the rear sheet material 174.

Next, the operation of the vehicle seat 101 will be described. Due to a frontal collision or the like, an acceleration or load directed to the front is applied to the occupant in the rear seat. In order to detect the load applied to the rear seat occupant, for example, a sensor 197 may be provided to detect the load applied to the seat belt 196 worn by the rear seat occupant.

When the acceleration of the rear seat occupant and the load applied to the seat belt 196 become equal to or greater than a predetermined value, the gas is released from the inflator 152. The gas released from the inflator 152 causes the air bag 151 to expand diagonally upward and backward along the guide surface 145. The inflated air bag 151 passes between the slits 168 to reach the suture portion 175. At this time, a load is applied to the first force cloth 181 and the second force cloth 182 by the expansion of the air bag 151. The load applied to the first force cloth 181 and the second force cloth 182 is transmitted to the suture portion 175, the suture portion 175 is broken, and an opening is formed at the back upper end of the seat back 104. The air bag 151 protrudes from the rear upper end of the seat back 104 through the opening, expands rearward and obliquely upward, and then deploys so as to extend downward and rearward. The air bag 151 has a convex arch shape when deployed (broken line in FIG. 11). Therefore, regardless of the distance between the vehicle seat 101 and the rear seat, the air bag 151 can be deployed on the front side of the upper body of the occupant. When the rear seat is close to the vehicle seat 101, the air bag 151 is bent, so that the load applied to the rear by the deployment of the air bag 151 can be reduced.

Next, the effects of the vehicle seat 101 will be described. Since the suture portion 175 is provided at the upper rear end of the seat back 104, the air bag 151 is deployed from the upper rear end of the seat back 104. Therefore, the collision of the neck and head of the occupant on the rear seat with the back upper end of the seat back 104 is prevented. In addition, since the slit 168 and the stitching portion 175 are disposed obliquely rearward and upper with respect to the air bag module 150, the air bag 151 can be deployed obliquely upward and backward from the rear upper end of the seat back 104. The deployed air bag 151 is located in front of the neck and head of the rear seat occupant, and thus can protect the neck and head of the occupant.

The guide stay 122 is passed through the through hole 183 of the first force cloth 181. Therefore, the movement of the first webbing 181 in the direction perpendicular to the extending direction of the guide stay 122 is restricted. The first force cloth 181 is sandwiched between the flange portion 192 and the first pad member 165. Therefore, the movement of the first stay 181 along the extending direction of the guide stay 122 is restricted. Therefore, the end on the side of the through hole 183 of the first webbing 181 is coupled to the guide stay 122. In addition, since it is not necessary to couple a locking member or the like to the first force cloth 181, the first force cloth 181 can be coupled to the seat back frame 107 because it can be coupled to the guide stay 122 by providing the through holes 183. The structure required to make it be simple is easy, and the assembly | attachment to the guide stay 122 of the 1st force cloth 181 is easy.

A reinforcing member 184 made of resin is coupled to the through hole 183 of the first force cloth 181 along the peripheral portion. By connecting the reinforcing member 184, the peripheral edge portion of the through hole 183 is reinforced, so that breakage of the first force cloth 181 starting from the through hole 183 is prevented.

The expansion of the air bag 151 applies a load to the second web 182 from the air bag 151. The load applied to the second web 182 is transmitted to the suture portion 175. Therefore, compared with the case where only the first force cloth 181 is provided, when the first force cloth 181 and the second force cloth 182 are provided, the load from the airbag 151 is more easily transmitted to the stitching portion 175. The expansion of the air bag 151 facilitates the opening of the sutured portion 175. Further, since the second force cloth 182 is hooked to the bracket 131 via the hook 195, the second force cloth 182 can be easily coupled to the bracket 131. Further, in the present embodiment, the second force cloth 182 is held by the bracket 131, but by providing a clip on the second force cloth 182 and fitting it in the through hole provided in the bracket 131, the second force cloth A cloth 182 may be coupled to the bracket 131.

The bracket 131 is welded to the upper frame 112 at at least two locations on the upper end, and rotation about the upper portion of the bracket 131 with its substantially vertical direction as an axis is restricted. The bracket 131 is welded to the side frame upper portion 114 at both left and right ends, and rotation about the lower portion of the bracket 131 with its substantially vertical direction as an axis is restricted. Since the brackets 131 are welded at four places separated from each other in the left and right and up and down directions, the brackets 131 do not easily come off the seat back frame 107. Therefore, the air bag module 150 can be firmly coupled to the seat back frame 107. Further, by connecting the left and right side frames 111 by the brackets 131, the side frames are reinforced, and the seat back frame 107 becomes difficult to deform.

A guide surface 145 is formed on the rear side of the air bag 151 to face a substantially rear side, and the inflator 152 is disposed below the air bag 151. The air bag 151 is inflated obliquely rearward and upward along the guide surface 145 by the gas supplied from the inflator 152. The air bag 151 can be guided by the guide surface 145 so as to deploy the air bag 151 rearward or upward.

Since a part of the inflator 152 is accommodated in the recess 141, the amount of rearward projection of the seat back 104 can be suppressed.

Since the inflator 152 is fastened to the edge wall 146 located at the rear of the guide surface 145, the air bag 151 does not easily abut on the bent portion (for example, the rear edge portion of the upper wall 143) of the plate in the bracket 131 when inflated. The breakage of the air bag 151 at the time of inflation can be prevented.

Since the second pad member 166 is provided on the back of the seat back 104, the back of the seat back 104 is softened, and the touch of the seat back 104 is improved. The second pad member 166 is formed separately from the first pad member 165. The second pad member 166 can be easily assembled by being inserted between the second force cloth 182 and the rear sheet material 174.

<< Third Embodiment >>
The third embodiment according to the present invention is different from the second embodiment in that the first force cloth 181, the reinforcing member 184, and the upper sheet member 173 are disposed above the guide stay 122. The headrest guide 190 is coupled to the guide stay 122 by passing through the through-holes of the first force cloth 181, the reinforcing member 184, and the upper sheet member 173. The first force cloth 181, the reinforcing member 184, and the upper sheet member 173 are held between the headrest guide 190 and the guide stay 122.

Since the headrest guide 190 passes through the through hole 183 of the first force cloth 181, the movement of the first force cloth 181 in the horizontal direction, more specifically, the direction perpendicular to the insertion direction of the headrest guide 190 into the guide stay 122 Is regulated. Since the first force cloth 181 is sandwiched between the headrest guide 190 and the guide stay 122, the vertical movement is restricted. Therefore, the end of the first web 181 on the side of the through hole 183 is coupled to the seat back frame 107. Further, the first force cloth 181 can be coupled to the seat back frame 107 by passing the headrest guide 190 through the through hole 183 of the first force cloth 181 and coupling to the guide stay 122, so that the structure for assembling Is simple, and the assembly of the first force cloth 181 is easy.

<< 4th Embodiment >>
The fourth embodiment according to the present invention is different from the second embodiment in that a support member 200 is provided instead of the bracket 131. As shown in FIGS. 17 and 18, the guide stays 122 respectively project below the upper frame 112. A support wire 201 is bridged to the left and right at the top of the left and right side frames 111. The support wire 201 is formed of a bent metal rod member and is welded to the side frame 111 at both ends. In the support wire 201, two support portions 202 which are bent in the front and back direction and which are in the shape of a square in a top view are provided separately in the left and right directions. A metal plate member 203 is provided on the upper side of the support portion 202, and the plate member 203 is welded to the support wire 201 at the support portion 202.

The support member 200 is a member made of resin, and includes a base 204 and two receivers 205 provided on the left and right sides of the base 204 separately along the front upper edge of the base 204. The base portion 204 has a substantially trapezoidal plate shape in rear view. The receiving portion 205 has a conic shape opened rearward in a top view, and has a bowl shape in a side view. The trailing edge of the receiver 205 is coupled to the front upper edge of the base 204. The base 204 and the receiving portion 205 form a receiving recess 206 which is recessed downward in the support member 200.

The guide stays 122 respectively project below the upper frame 112. Below the guide stay 122, a support member 200 is disposed. The lower portion of each guide stay 122 extends inside the receiving recess 206 and is fitted into the receiving recess 206. Thus, the upper portion of the support member 200 is coupled to the guide stay 122, and the front, rear, left, and right movement of the upper portion of the support member 200 is restricted.

In the lower part of the rear surface of the base 204, a recess 141 which is recessed forward is formed. The recess 141 is formed to extend leftward and rightward along the lower edge of the base 204. The recess 141 is defined by a bottom wall 142 facing rearward, an upper wall 143 facing downward, a lower wall 144 facing upward, and left and right side walls, and has a substantially rectangular parallelepiped shape extending laterally in a rear view. In the base portion 204, on the upper side of the recess 141, a guide surface 145 that faces substantially in the rear direction is formed. The guide surface 145 extends upward from the opening edge of the recess 141 and reaches the upper edge of the base 204.

The lower edge of the base 204 is provided with an edge wall 146 extending rearward and extending leftward and rightward. The edge wall 146 is located behind the guide surface 145, more specifically, a virtual surface obtained by extrapolating the guide surface 145 vertically and horizontally. In the present embodiment, the edge wall 146 and the lower wall 144 are formed at the same height and continuously form one wall.

Through holes are formed in the plate member 203 and the edge wall 146. The male screw parts 153 of the inflator 152 are inserted into the through holes from above, and the inflator 152 and the support member 200 are fastened together to the plate member 203 by a nut 155 coupled to the male screw parts 153.

In the fourth embodiment, the second webbing 182 is provided with the hook 195 similarly to the second embodiment, and the hook 195 is latched to the through hole provided in the edge wall 146 of the support member 200.

By fitting the guide stay 122 into the receiving recess 206, movement of the upper portion of the support member 200 in the front, rear, left, and right directions is restricted. The support member 200 is fastened to the plate member 203 at the edge wall 146, thereby restricting the vertical movement of the upper portion of the support member 200. Therefore, the upper portion of the support member 200 does not have to be fastened to the seat back frame 107, and the upper portion of the support member 200 can be easily coupled to the seat back 104.

As in the second embodiment, since the second web 182 is provided, the inflation pressure of the air bag 151 can be easily transmitted to the stitching portion 175. Further, since the second force cloth 182 is coupled to the seat back 104 by being latched to the support member 200, the second force cloth 182 can be easily assembled.

Since the support member 200 is made of resin, the weight of the vehicle seat 101 can be reduced. Moreover, since the support member 200 is lightweight, it becomes easy to assemble.

Fifth Embodiment
The fifth embodiment according to the present invention is different from the fourth embodiment in the arrangement of the first force cloth 181 and the reinforcing member 184. As shown in FIG. 19, the end on the side of the through hole 183 of the first web 181 is located below the upper frame 112. The lower portion of the guide stay 122 passes from above through the through hole 183 of the first force cloth 181 and the through hole 185 of the reinforcing member 184. Similar to the fourth embodiment, the support member 200 is fitted to the guide stay 122 from the lower side of the first force cloth 181 and the reinforcing member 184, and the first force cloth 181 and the reinforcing member 184 support the upper frame 112 and It is held between the member 200.

Since the lower part of the guide stay 122 passes through the through hole 183 of the first force cloth 181, the horizontal movement of the first force cloth 181 is restricted. Since the first force cloth 181 is sandwiched between the upper frame 112 and the support member 200, the movement in the vertical direction is restricted. Thus, the first webbing 181 is coupled to the seat back frame 107. Also, the lower part of the guide stay 122 is passed through the through hole 183 of the first force cloth 181, and the support member 200 is fitted into the guide stay 122, so that the first force cloth 181 is coupled to the guide stay 122. The structure of the second embodiment is simple, and the assembly of the first force cloth 181 is easy.

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

In the first embodiment, instead of the first bolt 74 and the second bolt 75 and the weld nut 72, the case 41 and the holder 22 may be fastened to the side frame 11 by another fastening member such as a rivet.

In the fifth embodiment, the support member 200 is coupled to the seat back 104 via the guide stay 122 and the wire, but the support member may be coupled to the lower portion of each guide stay 122 by bonding or the like.

In the second to fifth embodiments described above, the stitched portion between the trailing edge of the upper sheet material 173 and the upper edge of the rear sheet material 174 is set so as to break under a smaller load than the other sutured portions. Furthermore, the stitched portion between the left and right edges of the upper sheet material 173 and the upper edge of the side sheet material 172 may also be set so as to break with a smaller load compared to the other stitched portions.

1: Seat 4 according to the first embodiment: Seat back 6: Seat back frame 8: Skin material 11: Side frame 14: Cross frame 21: Air bag unit 22: Holder 23: Support plate 25: Pin locking hole 25A: Vertical hole 25B: Horizontal hole 28: Recess 29: Holder body 31: Flange 32: Reinforcement member 34: Flange side insertion hole 35: Holder fragile portion 41: Case 42: Lid 43: Inflator 44: Airbag 46: Retainer 46D : Fastening plate 53: Pin 56: First bolt hole 57: First case fragile portion 58: Second case fragile portion 59: Notched portion 61: Opening 67: Elastic claw 68: Locking hole 71: Second bolt hole 74 : 1st bolt (1st fastening member)
75: Second bolt (second fastening member)
101: Vehicle seat 102 according to the second to fifth embodiments: Floor 103: Seat cushion 104: Seat back 105: Head rest 107: Seat back frame 108: Pad member 109: Skin member 111: Side frame 112: Upper frame 122 : Guide stay 131: Bracket (supporting member)
141: recessed portion 144: lower wall 145: guide surface 146: edge wall 150: air bag module 151: air bag 152: inflator 167: pad through hole (receiving hole)
168: slit 175: suture portion 181: first force cloth 182: second force cloth 183: through hole 190: headrest guide 192: flange portion 194: headrest pillar 200: support member 201: support wire (wire)
206: Receiving recess

Claims

A vehicle seat having a seat cushion and a seat back, wherein
A seat back frame including a pair of left and right side frames extending vertically;
A holder extending to the left and right and coupled to the corresponding side frame at both left and right ends,
An air bag unit received in the holder and deployed rearward;
An outer surface of the seat back, and a skin material provided with an opening that exposes the air bag unit rearwardly;
The holder has a holder body defining a recess opening rearward, and a flange provided on an edge of the recess in the holder body,
The air bag unit includes a case disposed in the recess and opened rearward, a lid facing the flange at an edge and closing an open end of the case, and an inflator provided in the case. And an air bag,
The edge of the hole of the skin material passes between the flange and the lid, extends into the recess, and is locked to the holder main body.
The said holder has at least 1 reinforcement member provided in the said flange, The said holder main body and the said flange are formed by resin, The said reinforcement member is formed by metal, The said Claim 1 characterized by the above-mentioned. Vehicle seat.
The vehicle seat according to claim 2, wherein the reinforcing member is a plate-like member and is disposed inside the flange.
The vehicle seat according to claim 3, wherein the reinforcing member is formed in a corrugated shape.
The holder extends along each of a bottom wall, an upper wall, left and right side walls, and a lower wall defining the recess, and boundaries between the upper wall and the left and right side walls, and extends to the outer peripheral edge of the flange And a pair of left and right holder fragile portions which are torn by the inflation pressure of the air bag,
The vehicle seat according to claim 3 or 4, wherein the reinforcing member is disposed so as to avoid the holder fragile portion.
The vehicle seat according to claim 5, wherein the holder fragile portion has at least one of a plurality of through holes and a plurality of thin portions thinner than the side wall.
The flange has an insertion hole through which a bolt for fastening the holder to the side frame passes;
The said reinforcement member is arrange | positioned avoiding the said penetration hole, The vehicle seat of Claim 3 or Claim 4 characterized by the above-mentioned.
One of the reinforcing members is provided below the recess in the flange, and extends from one of the side frames to the other of the side frames. Seats for vehicles as described in one section.
9. The vehicle seat according to claim 8, wherein the reinforcing member provided below the recess in the flange is located rearward of the corresponding side frame at both ends.
The lid is pivotably connected to the lower edge of the open end of the case, and is connected to the upper edge and the left and right side edges of the open end of the case through a case weak portion that is torn by the inflation pressure of the airbag. The vehicle seat according to claim 5, characterized in that: