JP6204522B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat such as a vehicle seat, and more particularly, to a vehicle seat that improves the seating feeling of a passenger during a rear-end collision.

  In the case of a so-called rear collision where the vehicle collides with the rear surface of the vehicle, such as when a vehicle collides from the rear or rearward when traveling backward, the head of the seated occupant tilts backward due to inertia and the neck is There is a risk of shock.

  Therefore, the vehicle seat is provided with a headrest that receives the head of the occupant from the rear above the seat back in order to protect the head and neck of the occupant from impact caused by a rear collision and reduce the impact on the neck. Yes. In order to effectively reduce the impact at the time of the rear collision, it is desirable to quickly reduce the gap between the occupant's head and the headrest at the time of the rear collision.

  For this reason, the upper body of the occupant is moved backward at the time of a rear collision, the load due to this movement is received by the pressure receiving member, the headrest is moved forward, the occupant's head is supported, and the impact on the neck is reduced. A configured seat back has been proposed (Patent Document 1).

  In the seat back frame of a vehicle seat described in Patent Document 1, the left and right side frames have a plate-like lower frame (lower connecting member) at the lower part and a reclining rotation arranged in front of the lower frame. They are connected to each other by a shaft for dynamic support. And like patent document 2, a lower frame may not have a mere plate shape, but may have a flange extended ahead at the up-and-down end part. These lower frames are in a substantially vertical posture in a normal sitting posture, and are in a posture where they are slightly lowered with respect to the upper portion of the backrest (the portion where the upper back of the occupant hits).

JP 2010-083269 A JP 2008-067723 A

  By the way, since the lower connecting member receives a load from the occupant at the time of a rear collision, it is desired to be fixed to the side frame with sufficient strength.

  The present invention has been made in view of the background as described above, and an object thereof is to fix a lower connection member to a side frame with sufficient strength.

A vehicle seat of the present invention that solves the above-described problem is a vehicle seat comprising a seating frame that is a frame of a seating portion on which an occupant sits, and a seatback frame that is supported by the seating frame. Is provided with a side frame that is spaced apart from the left and right, and a lower connecting member that is disposed so as to pass between the lower portions of the left and right side frames, and that connects the left and right side frames. A side wall portion and an inner extending portion extending inward in the left-right direction from the side wall portion, and the inner extending portion is formed so that the size in the vertical direction becomes smaller toward the inner side in the left-right direction. has a joint portion which is joined to the left-right direction inner end becomes smaller in size in the vertical direction than the portion connected to said side wall portion of the inner extending portion, joint, lower Than the upper end of the connection member, characterized in that located below and behind.

  According to such a configuration, the lower connecting member can be fixed to the side frame with sufficient strength.

The lower connecting member has a rear wall portion and a front wall portion that extends from the upper end of the rear wall portion and is positioned in front of the rear wall portion, and the joint portion is disposed on the rear wall portion, The front wall portion may be disposed so as to overlap when viewed from the front-rear direction .

The lower connecting member may be provided with a through hole into which another component enters above the center in the vertical direction. In this case, the upper end of the through hole may be located above the joint, and a plurality of through holes may be provided.

The lower end portion of the lower connection member can be a free end.

  The lower connecting member has a rear wall portion connected to the inner extending portion, a front wall portion extending from the upper end of the rear wall portion and positioned in front of the rear wall portion, and the lower end portion of the lower connecting member is It may be a free end and may extend backward from the front wall.

  The seat back frame is rotatably supported with respect to the seating frame, and further includes a shaft disposed on a pivot shaft of the seat back frame, and a lower end of the lower connection member is positioned below the shaft and joined. The part may be located behind the shaft.

The left and right side frames include a side wall portion facing outward in the left-right direction and an inner extension portion extending inward in the left-right direction from the side wall portion, and both ends of the lower connecting member may be separated from the side wall portion. .

  According to the present invention, the lower connection member can be fixed to the side frame with sufficient strength.

It is a perspective view of a vehicle seat. It is a perspective view of a seat frame. It is an expansion perspective view of a lower connection member. It is figure (a) and (b) explaining the angle of the front surface of a front wall part. It is the figure which looked at the seat back frame which shows the welding part of a rear wall part and an inner side extension part from back. It is a sectional side view explaining the attachment structure of the back cover of a seat back. It is a sectional side view which shows the seat back frame at the normal time. It is a sectional side view showing a seat back frame at the time of weak rear collision. It is a sectional side view showing a seat back frame at the time of a strong rear collision. It is a sectional side view of the lower connection member concerning a modification. It is a perspective view which shows the modification of the escape part of a lower connection member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a vehicle seat S as an example of a vehicle seat according to the present invention includes a seat back S1, a seating portion S2, and a headrest S3. In the present specification, the front, rear, left and right are based on the occupant seated on the vehicle seat S in the normal state in which the seat back S1 is raised (not lying on the back by reclining).

  In the vehicle seat S, a seat frame F as shown in FIG. 2 is provided. The seat frame F includes a seat back frame 1 that is a frame of the seat back S1 and a seating frame 2 that is a frame of the seating portion S2. The seating frame 2 and the seat back frame 1 are connected via a reclining mechanism 3 (the detailed structure is not shown). A cushion and an outer skin are provided on the outside of the seat back frame 1 and the seating frame 2, and a cover 5 (see FIG. 6) as an example of a member to be attached is attached to the back by a clip 51 as an example of a fixing member. Thus, the seat back S1 and the seating portion S2 are configured.

  The seat back frame 1 is connected to a side plate 10 that is spaced apart from the left and right and extends in the vertical direction, an upper frame 21 that connects the upper ends of the side plates 10, and the lower ends of the left and right side plates 10. The lower connecting member 30 is configured in a frame shape. The upper frame 21 is formed by bending a metal pipe into a U-shape, and includes an upper connecting portion 21A that extends to the left and right and a connecting portion 21B that extends downward from the left and right ends of the upper connecting portion 21A. The connecting portion 21B is connected to the upper end of the side plate 10 by welding.

  The side plate 10 includes a lower member 12 made of a sheet metal provided at a lower end portion, and an upper member 11 integrated with the upper portion of the lower member 12 by welding. The lower member 12 includes a side wall portion 12A and an inner extending portion 13 extending inward from the rear end of the side wall portion 12A.

  As shown in FIG. 5, the inner extending portion 13 has an inclined edge portion 13 </ b> A that is inclined at an angle γ with respect to the vertical direction so that the inner end portion goes from the inside to the outside as it goes from top to bottom. ing. The inclined edge portion 13A is a portion where the lower connecting member 30 and the inner extending portion 13 are welded as will be described later. Moreover, the inner side extension part 13 has the clip hole 13B as an example of the attachment hole in which the clip 51 for attaching the cover 5 of the back surface of seat back S1 is inserted.

  Returning to FIG. 2, the side frame SF of the seat back frame 1 includes a side plate 10 and a connection portion 21 </ b> B of the upper frame 21. A pressure receiving member 40 made of a plate-like resin is disposed between the left and right side frames SF. The pressure receiving member 40 is a connecting wire (a connecting wire made of a bent wire having a spring property at two upper and lower portions). Member) 41 and the left and right side frames SF. Specifically, the upper connecting wire 41 has an end engaged with a bracket 43 welded to the connecting portion 21B, and the lower connecting wire 41 has a rotating member 45 whose lower end can swing back and forth. It is connected to. The rotating member 45 is fixed to the side plate 10 (upper member 11). For example, as disclosed in Japanese Patent Application Laid-Open No. 2010-179748, the lower end of the arm is normally positioned forward. When a large force directed backward from the wire 41 is applied, the lower end swings backward, and the pressure receiving member 40 can be moved largely backward.

  The upper frame 21 is provided with a pillar support portion 23, and the pillar support portion 23 is provided with a headrest frame (not shown). The headrest S3 described above is configured by providing a cushion member on the outside of the headrest frame.

  Next, details of the lower connecting member 30 will be described. The lower connecting member 30 is disposed so as to be passed between the lower portions of the left and right side frames SF. Thereby, even when the load from the side is received, the lateral collapse of the seat frame F can be suppressed, and the load from the side can be transmitted to the center of the vehicle.

  The lower connecting member 30 is made of sheet metal, and as shown in FIG. 3, extends from the upper end of the front wall portion 31, the rear wall portion 32, and the front wall portion 31 to connect the front wall portion 31 and the rear wall portion 32. An upper wall portion 33, a lower flange 34, and a folded flange 35 are provided.

  The front wall portion 31 is located in front of the shaft 3S of the reclining mechanism 3. The shaft 3 </ b> S is disposed on the rotation axis of the seating frame 2 and the seat back frame 1, and is provided so as to connect the left and right side frames SF to each other in order to support the rotation by the reclining mechanism 3. Since the front wall portion 31 of the lower connecting member 30 is positioned in front of the shaft 3S, the load applied via the seat back cushion from the occupant's buttocks or the like is not directly applied to the shaft 3S but applied to the front wall portion 31. Therefore, it is possible to relieve the feeling of sensation felt by the occupant from the shaft 3S in the buttocks or the like.

  As shown in FIG. 4A, the front wall portion 31 is slanted so that the front surface 31A is parallel to the direction in which the connection portion 21B extends (straight line L1) or upward with respect to the direction in which the connection portion 21B extends. It has become. In the example of FIG. 4A, the front surface 31A faces upward at an angle α with respect to the straight line L1. Further, the front wall portion 31 is also directed upward at an angle β with respect to the rear wall portion 32. Thereby, since the front wall part 31 and the rear wall part 32 are connected by the upper end and become a shape opened downward, it is possible to secure a stroke in which the front wall part 31 is deformed rearward at the time of a rear surface collision. Note that the connecting portion 21B, which is a pipe constituting the side frame SF, is not straight when viewed from the side, but is warped so that the upper part is raised or the upper part is sleeping as shown in FIG. 4B. May be warped. In such a case, the angle of the front surface 31A with respect to the pipe (connecting portion 21B) refers to the angle with the most standing direction of the pipe.

  The lower end of the front wall portion 31 extends below the lower end of the rear wall portion 32. As a result, the front wall portion 31 can be enlarged, the occupant's feeling of contact with the lower connecting member 30 can be reduced, and the front wall portion 31 is long from the upper end to the lower end, so that the front wall portion 31 is at the time of a rear collision. Can be easily deformed backward.

The rear wall portion 32 is a wall connected to the side frame SF (inner extending portion 13), and is a member that connects and supports the lower connection member 30 to the side frame SF. Specifically, as shown in FIG. 4A, the rear surface of the rear wall portion 32 is aligned with the front surface of the inner extension portion 13, and the inclined edge portion 13A of the inner extension portion 13 as shown in FIG. The inner extending portion 13 and the rear wall portion 32 are welded along. Since the inclined edge portion 13A is inclined with respect to the vertical direction, even if there is little overlap in the height direction between the inclined edge portion 13A and the rear wall portion 32, the welding length is increased and the necessary welding strength is obtained. Can be kept. The angle γ of the inclined edge portion 13A is desirably 20 degrees or more. When the angle γ is 20 degrees or more, the effect of increasing the weld length is increased. The angle γ is more desirably 30 degrees or more, and further desirably 40 degrees or more. Further, by setting the angle γ to 70 degrees or less, it is possible to prevent the inner extending portion 13 from becoming an excessively acute angle.
And since the rear wall part 32 is being fixed to the side frame SF, the movement to the back of the rear wall part 32 at the time of a rear surface collision is suppressed, and it is easy to deform | transform in the connection part of the front wall part 31 and the rear wall part 32. Thus, the rearward movement of the front wall portion 31 is easily controlled.

  Since the lower connecting member 30 of the present embodiment has the front wall portion 31 and the rear wall portion 32 connected to the front wall portion 31 as described above, it is compared with a simple plate-like lower connecting member. Thus, the rigidity against crushing in the left-right direction is increased, and the load from the side can be efficiently transmitted to the center of the vehicle.

  As shown in FIG. 3, the upper wall portion 33 has a flat plate shape that extends substantially in the front-rear direction. Thereby, when the upper end of the front wall part 31 and the upper end of the rear wall part 32 leave | separate moderately back and forth, and the front wall part 31 deform | transforms back, a deformation | transformation stroke can be enlarged. And the connection part of the front wall part 31 and the upper wall part 33 becomes a gentle shape without an edge by natural R shape made when bending between the upper wall part 33 and the front wall part 31. Yes.

  The lower flange 34 is bent rearward from the lower end of the front wall portion 31 below the shaft 3S and extends rearward. The connecting portion between the front wall portion 31 and the lower flange 34 also has a gentle shape without an edge due to a natural R shape formed when bent between the lower flange 34 and the front wall portion 31. Further, the lower flange 34 is not connected to the rear wall portion 32, so that the lower connecting member 30 does not have a closed cross-sectional shape. As described above, the lower flange 34 and the rear wall portion 32 are not connected and there is a gap between them, so that the rear wall portion 31 can be easily deformed rearward.

  The folded flange 35 is folded forward on the lower side from the rear end of the lower flange 34, and the front end of the folded flange 35 is located behind the lower end of the front wall portion 31. As described above, the lower connecting member 30 includes the lower flange 34 and the folded flange 35, so that the cross-sectional area of the lower connecting member 30 increases. Therefore, the rigidity in the left-right direction is improved and the load transmission to the side is improved. In addition, the front end of the turn-up flange 35 is located behind the lower end of the front wall portion 31 (the connecting portion between the front wall portion 31 and the lower flange 34), so that the edge of the front end of the turn-up flange 35 is at the time of a rear collision. The seat back cushion is not strongly hit, and the hit feeling of the lower connecting member 30 of the occupant can be suppressed, and damage to the seat back cushion can be suppressed.

  Through holes 38 are formed at two places on the left and right sides of the rear wall portion 32 of the lower connecting member 30, specifically, from the rear wall portion 32 to the upper wall portion 33. As shown in FIG. 6, the through-hole 38 prevents the tip of the clip 51 from interfering with the rear wall portion 32 of the lower connecting member 30 when the rear cover 5 is attached to the clip hole 13 </ b> B with the clip 51. Functions as an escape section. Therefore, the through hole 38 is provided at a position corresponding to each clip hole 13B.

  As shown in FIG. 5, the lower connecting member 30 does not reach the side wall portion 12A, and a slight gap is provided between the lower connecting member 30 and the side wall portion 12A. However, when the manufacturing error of the lower connecting member 30 and the climbing to the corner of the lower member 12 of the lower connecting member 30 are not problematic, the both ends of the lower connecting member 30 are configured to abut against the side wall portion 12A. Also good.

The effect | action at the time of the rear surface collision of the vehicle seat S comprised as mentioned above is demonstrated.
As shown in FIG. 7, before the rear collision occurs, the rotating member 45 is in a position where the lower end swings forward, and the pressure receiving member 40 is positioned at the forefront in the movable range. 7 to 9, the rotation member 45 is not shown, but the lower end of the rotation member 45 is positioned forward in the normal state of FIG. 7.

  When a relatively weak rear collision occurs, as shown in FIG. 8, the center portion of the seat back cushion 50 (the portion where the back of the occupant P hits) moves rearward, and the seat back cushion 50 moves the pressure receiving member 40 rearward. By pressing, the pressure receiving member 40 moves backward. At this time, the lower end of the rotating member 45 swings backward. In addition, the lower part of the seat back cushion 50 (the part where the occupant P's buttocks or the like hits) is slightly deformed when the inner surface hits the front surface 31 </ b> A of the lower connecting member 30. However, since the front surface 31A has a wide surface and is inclined slightly upward with respect to the connection portion 21B and the rear wall portion 32, the reaction force received by the occupant P's buttocks from the lower connection member 30 is small. It acts as a pressure, and the sensation that the occupant P receives from the lower connecting member 30 is soft. Moreover, since the connection part of the front wall part 31 and the upper wall part 33 of the lower connection member 30 and the connection part of the front wall part 31 and the lower flange 34 are gentle curved surfaces, the passenger | crew P is a lower part. There is no strong hit feeling from the connecting member 30. Further, since the front end of the turn-up flange 35 is located behind the lower end of the front wall portion 31, the edge of the front end of the turn-up flange 35 does not hit the inner surface of the seat back cushion 50 strongly. 50 damage can be suppressed. Further, since the front wall portion 31 is in front of the shaft 3S, the seat back cushion 50 does not directly hit the shaft 3S. For this reason, the occupant P does not feel the shaft 3S.

  When a relatively strong rear collision occurs, as shown in FIG. 9, the central portion of the seat back cushion 50 moves rearward greatly, and the pressure receiving member 40 also moves backward while the connecting wire 41 is elastically deformed. Move a lot. At this time, the seat back cushion 50 strongly hits the front surface 31 </ b> A of the lower connection member 30, and the lower connection member 30 bends and deforms at the connection portion between the front wall portion 31 including the upper wall portion 33 and the rear wall portion 32. . For this reason, even if a strong force is applied to the seat back cushion 50 from the buttocks of the occupant P, the front wall portion 31 of the lower connecting member 30 absorbs the impact by moving backward, and the occupant P is strong in the buttocks and the like. There is no feeling of hit. In particular, in the vehicle seat S of the present embodiment, there is a flat plate-like upper wall portion 33 extending substantially in the front-rear direction between the front wall portion 31 and the rear wall portion 32, so that the front wall portion 31 and the rear wall portion 32 A space between them can be secured, and the stroke of deformation of the front wall portion 31 to the rear, that is, the amount of shock absorption can be increased.

  As in the case of a light rear collision, the connecting portion between the front wall portion 31 and the upper wall portion 33 of the lower connecting member 30 and the connecting portion between the front wall portion 31 and the lower flange 34 are gentle. Since it is a curved surface, it is difficult for the occupant P to feel a strong hit feeling from the lower connecting member 30. Further, since the front end of the turn-up flange 35 is located behind the lower end of the front wall portion 31, the edge of the front end of the turn-up flange 35 does not hit the inner surface of the seat back cushion 50 strongly. 50 damage can be suppressed. Furthermore, since the front wall part 31 is ahead of the shaft 3S, the seat back cushion 50 does not directly hit the shaft 3S, and the feeling of the shaft 3S hitting the occupant P can be reduced.

  And in the vehicle seat S of the present embodiment, the lower connecting member 30 has a front wall portion 31 and a rear wall portion 32 that are connected to each other at the upper portion instead of a flat plate like the conventional one. As a whole, rigidity against bending load in the front-rear direction is also improved. Therefore, conventionally, the rear frame is bent so that the center of the lower frame is displaced backward with respect to the side frame in the event of a rear collision, and the side frame is also deformed (orientated) so that the front end is closer to the left and right inside. However, such deformation is unlikely to occur in the vehicle seat S of the present embodiment. That is, the lower connecting member 30 is easily deformed so that the front wall portion 31 approaches the rear wall portion 32, but is difficult to be deformed so as to be bent in a square shape in plan view. The deformation of can also be suppressed. Further, since the lower connecting member 30 is provided so as to pass to the left and right side frames SF, when a load is applied to the side frame SF to be deformed inward, the front wall portion 31 is provided on the inner surface of the side frame SF. By hitting, deformation of the side frame SF can be suppressed.

  Further, in the vehicle seat S of the present embodiment, the lower connection member 30 is disposed so as to be passed to the left and right side frames SF, and the front wall portion 31, the rear wall portion 32, the upper wall portion 33, the lower flange 34, and Since the folding flange 35 has a sufficient cross-sectional area, when the vehicle receives a collision load from the side surface, the vehicle seat S is prevented from being crushed in the left-right direction, and the load from the side is applied to the vehicle. To the center of Particularly, since the lower connecting member 30 is welded to the inner extending portion 13 of the side frame SF at the inclined edge portion 13A, the lower connecting member 30 is fixed to the side frame SF with a long weld length and sufficient strength. Thereby, the rigidity of the seat back frame 1 can be increased and the load from the side can be efficiently transmitted to the center of the vehicle. In other words, without increasing the size of the lower connecting member 30 in the vertical direction, the left and right rigidity of the vehicle seat S can be increased by increasing the welding length of the lower connecting member 30 and the inner extending portion 13. .

  Further, in the vehicle seat S of the present embodiment, the through hole 38 as the escape portion is provided in the rear wall portion 32 of the lower connection member 30, so that when the cover 5 on the back surface of the seat back S 1 is attached, Interference with the rear wall portion 32 is avoided, and the assembly work is easy to perform. That is, even if there is some error in the size and shape of the rear wall portion 32, interference between the clip 51 and the rear wall portion 32 can be avoided, so that the lower connecting member 30 and the side frame SF can be assembled and the clip 51 can be attached. There is no need to pay extra attention and work is easy. In addition, since the escape portion is the through hole 38, when the lower connection member 30 made of sheet metal is manufactured by press working, the escape portion can be easily formed by blanking, so that the manufacture is easy.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below.

  For example, in the above-described embodiment, the lower connecting member 30 has the flat upper wall portion 33, but the upper wall portion 33 'connecting the front wall portion 31 and the rear wall portion 32 is shown in FIG. It is good also as a shape bent by 1 R like this.

  In the above embodiment, the escape portion of the lower connection member 30 is formed by the through hole 38, but may be formed by a recess 38 'as shown in FIG. By using the concave portion 38 ′ instead of the through hole 38, an escape portion can be formed without reducing the strength of the rear wall portion 32, and interference between the clip 51 and the rear wall portion 32 can be avoided.

  In the embodiment, the front surface 31A of the front wall portion 31 is inclined so as to face upward with respect to the direction in which the pipe of the connection portion 21B extends in a side view, but may be parallel to the direction in which the pipe extends.

  In the above-described embodiment, the pressure receiving member 40 is provided and the occupant P actively enters the seat back S1 at the time of a rear collision. However, the present invention can be applied to a seat without the pressure receiving member 40. Good. However, when the pressure receiving member 40 is present, the lower connecting member 30 and the occupant P are likely to approach each other, and the present invention can be effectively used in such a case.

  In the above embodiment, the inclined edge portion 13A of the inner extension portion 13 is inclined with respect to the vertical direction so that the inner end portion goes from the inside to the outside as it goes from top to bottom. On the contrary, you may incline with respect to a perpendicular direction so that an inner edge part may go inside from the outer side as it goes down from the top.

  In the above-described embodiment, the pressure receiving member 40 is supported on the side frame SF by the connecting wire 41. However, the pressure receiving member 40 may be supported on the side frame SF by another connecting member such as rubber or a belt.

  In the embodiment, the cover on the back of the seat back is illustrated as an example of the attached part, but a harness, switches operated in the back seat, a pocket on the back of the seat back, etc. may be attached as the attached part. it can. Further, the mounting hole is not a simple hole but can be a hole for screwing a tapping bolt or a female screw hole, and the fixing member can be a bolt, a tapping bolt, a rivet or the like.

  Moreover, in the said embodiment, although the vehicle seat S was shown as an example of application of a vehicle seat, the vehicle seat of this invention is applied to the sheet | seat for other vehicles, for example, a ship, and an aircraft. You can also.

DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Seating frame 3 Reclining mechanism 3S Shaft 5 Cover 10 Side plate 11 Upper member 12 Lower member 12A Side wall part 13 Inner extension part 13A Inclined edge part 13B Clip hole 21 Upper frame 21A Upper connection part 21B Connection part 23 Pillar support part DESCRIPTION OF SYMBOLS 30 Lower connection member 31 Front wall part 31A Front surface 32 Rear wall part 33 Upper wall part 33 'Upper wall part 34 Lower flange 35 Folding flange 38 Through hole 38' Recess 40 Pressure receiving member 50 Seat back cushion 51 Clip F Seat frame S For vehicles Seat S1 Seat back S2 Seating part S3 Headrest SF Side frame

Claims (9)

A vehicle seat comprising a seating frame that is a frame of a seating portion on which an occupant sits, and a seat back frame supported by the seating frame,
The seat back frame includes a side frame that is spaced apart from the left and right, and a lower connection member that is disposed so as to be passed between the lower portions of the left and right side frames, and that connects the left and right side frames,
The left and right side frames each have a side wall portion and an inner extending portion extending inward in the left-right direction from the side wall portion ,
The inner extension portion is formed so that the size in the vertical direction becomes smaller as going inward in the left-right direction,
The lower connection member has a joint portion joined to an edge portion on the inner side in the left-right direction whose size in the vertical direction is smaller than a portion connected to the side wall portion of the inner extension portion ,
The vehicle seat according to claim 1, wherein the joint portion is located below and behind the upper end of the lower connecting member. The lower connecting member has a rear wall portion, and a front wall portion extending from an upper end of the rear wall portion and positioned in front of the rear wall portion,
The joint is disposed on the rear wall;
The vehicle seat according to claim 1, wherein the joint portion and the front wall portion are arranged so as to overlap each other when viewed from the front-rear direction . The vehicle seat according to claim 1 or 2, wherein the lower connecting member is provided with a through hole into which another part enters above the center in the vertical direction.   The vehicle seat according to claim 3, wherein an upper end of the through hole is located above the joint.   The vehicle seat according to claim 3 or 4, wherein a plurality of the through holes are provided.   The vehicle seat according to any one of claims 1 to 5, wherein a lower end portion of the lower connecting member is a free end.   The lower connecting member has a rear wall portion connected to the inner extending portion, a front wall portion extending from an upper end of the rear wall portion and positioned in front of the rear wall portion,
  The vehicle seat according to any one of claims 1 to 5, wherein a lower end portion of the lower connection member is a free end and extends rearward from the front wall portion. .   The seat back frame is rotatably supported with respect to the seating frame,
  A shaft disposed on the pivot shaft of the seat back frame;
  The lower end of the lower connecting member is located below the shaft,
  The vehicle seat according to any one of claims 1 to 7, wherein the joint portion is located behind the shaft. The left and right side frames include a side wall portion facing outward in the left-right direction, and the inner extension portion extending inward in the left-right direction from the side wall portion,
The vehicle seat according to any one of claims 1 to 7, wherein both ends of the lower connection member are spaced apart from the side wall portion.

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