JP2021183479A - Vehicle seat and method of making vehicle seat - Google Patents

Abstract

To widen a space in front of a seat cushion and facilitate assembling work in a vehicle seat.SOLUTION: A vehicle seat includes: a base provided on a floor; a seat back rotatably provided on the base; a seat cushion rotatably provided on the seat back; and a driving device 61 connected to the base and the seat back and rotating the seat back with respect to the base. The driving device 61 is arranged behind the front end of the seat cushion.SELECTED DRAWING: Figure 12

Description

The present invention relates to a vehicle seat and a method for manufacturing a vehicle seat.

Patent Document 1 discloses a dive-down seat in which the seat cushion moves to the floor side in a storage form. The seat cushion and floor are connected by front and rear legs, and the seat cushion, floor, front and rear legs form a four-bar link. The front leg and the floor are connected by a driving means equipped with a screw rod that reciprocates under the driving force of an electric motor. When the driving means is driven, the angle of the front leg with respect to the floor changes, and the seat cushion moves. As a result, the sheet changes from a usage form to a storage form.

Japanese Unexamined Patent Publication No. 2004-262294

In the seat according to Patent Document 1, the driving means is provided in front of the front leg on the floor. Therefore, there is a problem that the space in front of the seat cushion becomes narrow. Further, since the drive means needs to be mounted on the floor separately from the seat, there is a problem that the seat assembling work is complicated.

In view of the above background, it is an object of the present invention to widen the space in front of the seat cushion in the vehicle seat. Another object of the present invention is to facilitate the assembling work in the vehicle seat.

In order to solve the above problems, one aspect of the present invention is a vehicle seat (1,200) that can be rotated to a base (7) provided on the floor (4) and the base (7). The seat back (3) provided in the seat back (3), the seat cushion (2) rotatably provided in the seat back (3), and the base and the seat back (3) connected to the base (7). ), The second drive device (61) is arranged behind the front end of the seat cushion (2). ..

According to this aspect, since the second driving device is arranged behind the front end of the seat cushion, the space in front of the seat cushion can be widened. Further, since the second drive device is connected to the base and the seat back, it is not necessary to fix the second drive device to the floor, and the assembly work can be facilitated.

In the above embodiment, the base (7) includes left and right base side members (11) extending back and forth and base cross members (13, 213) extending left and right and coupled to the left and right base side members (11). The drive device is coupled to the case with a case (61A) supported by the base cross member (13, 213) and a nut (61B) rotatably supported by the case. It is screwed into the ball screw nut (61B) with an electric motor (61D) that generates a driving force to rotate the nut (61B), extends back and forth, and is rotatably connected to the seat back (3) at the rear end. It is preferable to have a screw shaft (61C).

According to this aspect, since the drive device is arranged on the base cross member provided between the left and right base side members, the seat back can be rotated with good stability by one drive device.

In the above embodiment, the case may be coupled to the base cross member (13, 213) via a hinge.

According to this aspect, since the ball screw shaft (61C) can be rotated according to the angle of the seat back, the seat back can be rotated efficiently.

In the above embodiment, the base cross member (213) may be formed of a pipe material having at least one bent portion.

According to this aspect, the configuration of the base cross member can be simplified and the rigidity can be improved.

In the above aspect, the seat back (3) has a left and right backside member (17) and a lower member (19) extending left and right and coupled to the left and right backside members (17), and the ball. The rear end of the screw shaft (61C) may be rotatably connected to the lower member (19).

According to this aspect, since the screw shaft is connected to the lower member arranged between the left and right back side members, the load from the screw shaft can be stably transmitted to the seat back.

In the above aspect, the left and right backside members (17) have a plate-shaped main body portion whose surface faces left and right, and an edge wall portion protruding inward from the edge of the main body portion, and the lower member. (19) may have a groove-shaped cross section, and may have a first channel material (19A) welded to the edge wall portion at the left and right ends.

According to this aspect, the rigidity of the lower member can be improved. As a result, the driving force from the driving device can be efficiently transmitted to the seat back.

In the above embodiment, the lower member (19) is arranged inside the first channel material (19A) and is bonded to the first channel material (19A) with a second channel material having a groove-shaped cross section. 19B), the rear end of the ball screw shaft (61C) may be connected to the first channel material (19A) at a position corresponding to the second channel material (19B) in the left-right direction. ..

According to this aspect, the rigidity of the portion of the lower member to which the ball screw shaft is connected can be improved. As a result, the driving force from the driving device can be efficiently transmitted to the seat back.

In the above embodiment, the lower member (19) is provided with a bracket (217) that rotatably supports the ball screw shaft (61C), and the seat back (3) is extended vertically. It is preferable that the bracket (217) extends downward and forward from the lower member (19) and rotatably supports the rear end of the ball screw shaft (61C) at the tip portion about an axis extending left and right.

According to this aspect, in the state where the seat back is horizontally extended, that is, the seat is retracted, the bracket extends downward from the lower member, so that the rear end of the bracket and the screw shaft is arranged below the back surface of the seat back.

In the above aspect, the electric motor (61D) is arranged behind the base cross member (213).

According to this aspect, the distance between the electric motor and the nut and the seat back can be shortened, and the screw shaft can be shortened. As a result, the drive device can be miniaturized.

In the above aspect, it is preferable that the rotation axis of the electric motor (61D) extends in the left-right direction, and the axis of the ball screw shaft (61C) extends in the front-rear direction in a plan view.

According to this aspect, the distance between the electric motor and the nut and the seat back can be shortened, and the screw shaft can be shortened. As a result, the drive device can be miniaturized.

Another aspect of the present invention is a method for manufacturing a vehicle seat (1,200), which comprises a step of rotatably providing a seat back (3) on a base (7) and a seat on the seat back (3). The step of providing the cushion (2) rotatably and the driving device (61) for rotating the seat back (3) with respect to the base (7) are provided with the base (7) and the seat back (3). It has a step of connecting to the seat cushion (2) and providing the seat cushion (2) behind the front end.

According to this aspect, a vehicle seat provided with a second driving device can be unitized. This facilitates the attachment of the vehicle seat to the vehicle.

One aspect of the present invention is a vehicle seat (1,200), which is a base (7) provided on the floor (4) and a seat back (3) rotatably provided on the base (7). ), A seat cushion (2) rotatably provided on the seat back (3), and the base and the seat back (3) are connected to the seat back (7) with respect to the base (7). It has a drive device (61) for rotating 3), and the second drive device (61) is arranged behind the front end of the seat cushion (2).

According to this aspect, since the second driving device is arranged behind the front end of the seat cushion, the space in front of the seat cushion can be widened. Further, since the second drive device is connected to the base and the seat back, it is not necessary to fix the second drive device to the floor, and the assembly work can be facilitated.

In the above embodiment, the base (7) includes left and right base side members (11) extending back and forth and base cross members (13, 213) extending left and right and coupled to the left and right base side members (11). The drive device is coupled to the case with a case (61A) supported by the base cross member (13, 213) and a nut (61B) rotatably supported by the case. It is screwed into the ball screw nut (61B) with an electric motor (61D) that generates a driving force to rotate the nut (61B), extends back and forth, and is rotatably connected to the seat back (3) at the rear end. It is preferable to have a screw shaft (61C).

According to this aspect, since the drive device is arranged on the base cross member provided between the left and right base side members, the seat back can be rotated with good stability by one drive device.

In the above embodiment, the case may be coupled to the base cross member (13, 213) via a hinge.

According to this aspect, since the ball screw shaft (61C) can be rotated according to the angle of the seat back, the seat back can be rotated efficiently.

In the above embodiment, the base cross member (213) may be formed of a pipe material having at least one bent portion.

According to this aspect, the configuration of the base cross member can be simplified and the rigidity can be improved.

In the above aspect, the seat back (3) has a left and right backside member (17) and a lower member (19) extending left and right and coupled to the left and right backside members (17), and the ball. The rear end of the screw shaft (61C) may be rotatably connected to the lower member (19).

According to this aspect, since the screw shaft is connected to the lower member arranged between the left and right back side members, the load from the screw shaft can be stably transmitted to the seat back.

In the above aspect, the left and right backside members (17) have a plate-shaped main body portion whose surface faces left and right, and an edge wall portion protruding inward from the edge of the main body portion, and the lower member. (19) may have a groove-shaped cross section, and may have a first channel material (19A) welded to the edge wall portion at the left and right ends.

According to this aspect, the rigidity of the lower member can be improved. As a result, the driving force from the driving device can be efficiently transmitted to the seat back.

In the above embodiment, the lower member (19) is arranged inside the first channel material (19A) and is bonded to the first channel material (19A) with a second channel material having a groove-shaped cross section. 19B), the rear end of the ball screw shaft (61C) may be connected to the first channel material (19A) at a position corresponding to the second channel material (19B) in the left-right direction. ..

According to this aspect, the rigidity of the portion of the lower member to which the ball screw shaft is connected can be improved. As a result, the driving force from the driving device can be efficiently transmitted to the seat back.

In the above embodiment, the lower member (19) is provided with a bracket (217) that rotatably supports the ball screw shaft (61C), and the seat back (3) is extended vertically. It is preferable that the bracket (217) extends downward and forward from the lower member (19) and rotatably supports the rear end of the ball screw shaft (61C) at the tip portion about an axis extending left and right.

According to this aspect, in the state where the seat back is horizontally extended, that is, the seat is retracted, the bracket extends downward from the lower member, so that the rear end of the bracket and the screw shaft is arranged below the back surface of the seat back.

In the above aspect, the electric motor (61D) is arranged behind the base cross member (213).

According to this aspect, the distance between the electric motor and the nut and the seat back can be shortened, and the screw shaft can be shortened. As a result, the drive device can be miniaturized.

In the above aspect, it is preferable that the rotation axis of the electric motor (61D) extends in the left-right direction, and the axis of the ball screw shaft (61C) extends in the front-rear direction in a plan view.

According to this aspect, the distance between the electric motor and the nut and the seat back can be shortened, and the screw shaft can be shortened. As a result, the drive device can be miniaturized.

Another aspect of the present invention is a method for manufacturing a vehicle seat (1,200), which comprises a step of rotatably providing a seat back (3) on a base (7) and a seat on the seat back (3). The step of providing the cushion (2) rotatably and the driving device (61) for rotating the seat back (3) with respect to the base (7) are provided with the base (7) and the seat back (3). It has a step of connecting to the seat cushion (2) and providing the seat cushion (2) behind the front end.

According to this aspect, a vehicle seat provided with a second driving device can be unitized. This facilitates the attachment of the vehicle seat to the vehicle.

Perspective view of the frame of the sheet according to the embodiment Side view of the seat frame It is a perspective view which looked at the frame of a sheet from the rear lower part, and shows the state which removed the plate member. Perspective view showing the bottom of the seat back frame Perspective view of the second drive unit Front view showing the bottom of the seat back frame Sectional drawing which shows the connection part of the lower member and the 2nd drive device. Side view showing the lower end of the lower part of the side member Explanatory drawing showing connection structure of control cable and harness A side view showing (A) usage mode, (B) transition state from usage mode to storage mode, and (C) storage mode of the sheet. Sectional drawing which shows the connection part of the lower member and the 2nd drive device which concerns on a modification embodiment. Front view of the bottom of the seat Perspective view of the seat A perspective view showing the structure of the base cross member and its surroundings according to the second embodiment. (A) rear view, (B) side view of the bracket Sectional drawing which shows the main part of the sheet in a storage form Perspective view of the second drive device equipped with a strain sensor

Hereinafter, an embodiment in which the vehicle seat according to the present invention is applied to the rear seats (including the second and third rows) of an automobile will be described with reference to the drawings. The form of the vehicle seat changes between the usage form (seating form) and the storage form as described later. Unless otherwise specified, the shape and orientation of each configuration of the vehicle seat will be described with reference to the usage pattern. Further, when it is described that each member is connected, the joining mode shall include welding and fastening unless otherwise specified.

As shown in FIGS. 1 and 10, the seat 1 has a seat cushion 2 and a seat back 3. The seat back 3 is rotatably supported by the floor 4, and the seat cushion 2 is rotatably supported by the seat back 3. A lock device 5 that selectively regulates the rotation of the seat back 3 with respect to the floor 4 is provided between the seat back 3 and the floor 4. In the usage mode of the seat 1, the seat back 3 stands up against the floor 4 and the seat cushion 2 is separated upward from the floor 4. From the usage mode of the seat 1, the seat back 3 rotates forward, so that the seat 1 becomes a storage mode. As the seat 1 changes from the usage form to the storage form, the seat cushion 2 moves downward and comes close to the floor 4. In the storage form of the seat 1, the seat back 3 extends substantially horizontally and overlaps the seat cushion 2.

As shown in FIGS. 1 and 2, the floor 4 is provided with a base 7. The base 7 extends left and right on the upper surface of the floor 4 to the left and right base side members 11 connected to the floor 4, and left and right base pillars 12 extending upward from the rear ends of the left and right base side members 11. It has a base cross member 13 that extends and is coupled to the left and right base side members 11. Each of the base side member 11, the base pillar 12, and the base cross member 13 is formed of sheet metal.

As shown in FIGS. 1 to 3, the left and right base side members 11 have a bottom wall portion 11A whose surface faces up and down and is connected to the floor 4, and a vertical wall portion extending upward from the side edge of the bottom wall portion 11A. Has 11B and. The base pillar 12 and the base side member 11 may be formed of a common sheet metal or may be formed of a sheet metal independent of each other. In the present embodiment, the base pillar 12 on the right side is integrally formed with the base side member 11. The base pillar 12 on the left side is formed by a sheet metal independent of the base side member 11 and is connected to the base side member 11. The base pillar 12 has a plate-shaped pillar main body portion 12A whose surface faces left and right, and a pillar edge wall portion 12B extending outward from the leading edge and the trailing edge of the pillar main body portion 12A.

The base cross member 13 has a lower channel material 13A having a groove-shaped cross section that opens upward and an upper channel material 13B having a groove-shaped cross section that opens downward. The length of the upper channel material 13B in the left-right direction is shorter than the length of the lower channel material 13A in the left-right direction. The upper channel material 13B and the lower channel material 13A cooperate to form a closed cross-sectional structure. The upper channel material 13B may be fitted inside the lower channel material 13A. The left and right ends of the lower channel member 13A are coupled to the vertical wall portion 11B of the corresponding base side member 11. The left end portion of the upper channel material 13B is connected to the left vertical wall portion 11B. The right end portion of the upper channel material 13B is arranged to the left of the center in the left-right direction of the lower channel material 13A. It is preferable that the bottoms of the lower channel material 13A and the upper channel material 13B are provided with an uneven structure such as a beat in order to increase the rigidity.

As shown in FIGS. 1 and 4, the seat back 3 has a seat back frame 16. A pad (not shown) is supported on the seat back frame 16, and the pad and the seat back frame 16 are covered with a skin material (not shown). The seat back frame 16 has left and right backside members 17, an upper member 18, a lower member 19, a first cross member 21, a second cross member 22, a third cross member 23, and a plate member 24. The left and right backside members 17 extend vertically with a space between the left and right backside members 17. The upper member 18 extends to the left and right and is connected to the upper ends of the left and right backside members 17. The lower member 19 extends below the upper member 18 to the left and right, and is connected to the lower part of the left and right backside members 17. The first to third cross members 21 to 23 extend left and right between the upper member 18 and the lower member 19, and are connected to the intermediate portion of the left and right backside members 17.

The left and right backside members 17 have a side member upper portion 17A and a side member lower portion 17B coupled to the side member upper portion 17A. The left and right side member upper portions 17A and the upper member 18 are formed by bending a continuous pipe material. The left and right side member lower portions 17B have a main body portion 17C formed of sheet metal and whose surface faces left and right, and an edge wall portion 17D bent inward from the edge of the main body portion 17C.

The upper member 18 is provided with left and right headrest support portions 26. The left and right headrest support portions 26 are coupled to the front surface of the central portion of the upper member 18 in the left-right direction at a distance from each other. The left and right headrest support portions 26 are formed in a cylindrical shape and extend downward from the upper member 18.

As shown in FIGS. 4 to 7, the lower member 19 has a rear channel material 19A having a cross-section groove opening toward the front and a front channel material 19B having a cross-section groove opening toward the front. The length of the front channel material 19B in the left-right direction is shorter than the length of the rear channel material 19A in the left-right direction. The rear channel material 19A and the front channel material 19B cooperate to form a closed cross-sectional structure. The front channel material 19B may be fitted inside the rear channel material 19A. The left and right ends of the rear channel material 19A are arranged inside the edge wall portion 17D of the corresponding side member lower portions 17B on the left and right, and are welded to the edge wall portion 17D. It is preferable that the end portion of the edge wall portion 17D of the side member lower portion 17B is welded to the rear surface of the rear channel material 19A. The end of the rear channel material 19A has an extension 19C to increase the contact area of the side member lower portion 17B with the edge wall portion 17D. The extension portion 19C may be provided at the tip of the side wall portion forming the groove shape of the rear channel material 19A.

The left end portion of the front channel material 19B is connected to the main body portion 17C of the left side member lower portion 17B. The right end portion of the front channel material 19B is arranged to the left of the center in the left-right direction of the rear channel material 19A. It is preferable that the bottoms of the rear channel material 19A and the front channel material 19B are provided with convex portions 19D such as beads in order to increase the rigidity. It is preferable that the convex portion 19D bulges toward the front channel material 19B and is in contact with the front channel material 19B. Further, the convex portion 19D may extend to the left and right along the rear channel material 19A.

As shown in FIGS. 1 and 4, the first cross member 21 and the second cross member 22 are formed of a rod-shaped member having a circular cross section. The first cross member 21 extends to the left and right below the upper member 18 and above the lower member 19. The left and right end portions 21A of the first cross member 21 are bent upward with respect to the central portion and welded to the corresponding side member upper portion 17A. The second cross member 22 extends to the left and right below the first cross member 21 and above the lower member 19. The left and right ends of the second cross member 22 are bent upward with respect to the central portion and welded to the corresponding side member upper portion 17A.

The third cross member 23 extends to the left and right below the second cross member 22 and above the lower member 19, and is welded to the left and right side member lower portions 17B. The third cross member 23 may be formed of a plurality of sheet metal members. The third cross member 23 has a main body portion 23A whose surface faces forward and backward, and a bent portion 23B that extends forward and upward from the lower edge of the main body portion 23A and then further bends and extends downward. An anchor 23C projecting forward is provided on the lower edge of the third cross member 23. The anchor 23C is used to lock the hook of the child seat.

The plate member 24 is facet back and forth and is welded to the left and right backside members 17, upper member 18, lower member 19, and third cross member 23. The upper edge of the plate member 24 is located above the upper member 18 and extends to the left and right. The lower edge of the plate member 24 is located below the lower member 19 and extends to the left and right. The left and right side edges of the plate member 24 are located on the left and right outer sides of the left and right back side members 17, and extend vertically. A curved portion 24A curved in an arc shape is provided at each edge portion of the plate member 24. The curved portion 24A has a semi-circular cross section that is convex toward the front and extends along each edge portion. It is preferable that each curved portion 24A is provided with a concavo-convex structure such as a plurality of beads. Each uneven structure may extend in a direction orthogonal to the extending direction of the curved portion 24A. Each curved portion 24A and each uneven structure improve the rigidity of the plate-shaped portion.

The plate member 24 has a flat surface portion 24B whose surface faces forward and backward, and a plurality of raised portions 24C raised from the flat surface portion 24B. The raised portion 24C may be raised forward or backward with respect to the flat surface portion 24B. Each raised portion 24C is formed by pushing a plate-shaped portion forward or backward. The raised portion 24C improves the rigidity of the plate member 24.

As shown in FIGS. 4 and 6, the rear channel material 19A and the front channel material 19B of the lower member 19 are formed with at least one through hole 19E penetrating the front and rear. The through hole 19E of the front channel material 19B is arranged at a position overlapping the through hole 19E of the rear channel material 19A in the front-rear direction. The plate member 24 is provided with a sign for aligning with the lower member 19. The sign may be a hole, a convex portion, a concave portion, a design, or the like. When the plate member 24 is positioned appropriately with respect to the lower member 19, the marker is exposed forward through the through hole 19E.

In another embodiment, the left and right backside members 17, upper members 18, and lower members 19 may be integrally formed with the plate member 24. For example, a three-dimensional shape may be formed by press-molding the plate member 24, and this three-dimensional shape may form a backside member 17, an upper member 18, and a lower member 19.

As shown in FIGS. 1 and 4, the left and right side member lower portions 17B are rotatably supported by the corresponding base pillars 12 on the left and right sides via the lock device 5. The rotation axes of the left and right side member lower portions 17B extend to the left and right and are arranged coaxially with each other. The lock device 5 is arranged coaxially with the rotation axis of the side member lower portion 17B.

As shown in FIG. 8, the locking device 5 has an operating shaft 5A that extends along the rotation axis of the backside member 17, penetrates the backside member 17, and projects inward to the left and right of the backside member 17. , The rotation of the operation shaft 5A allows or restricts the rotation of the side member with respect to the floor 4. A known reclining mechanism can be applied to the locking device 5. The locking device 5 is provided in, for example, a first portion coupled to the base pillar 12, a second portion coupled to the side member lower portion 17B and rotatably supported by the first portion, and a second portion. A lock claw that can move between the connection position that joins the first part and the release position that is away from the first part, the spring 5D that urges the lock claw to the connection position, and the rotation axis of the second member with respect to the first member. An operating shaft 5A that is coaxial with the second member and can rotate with respect to the second member, and a cam that is coupled to the operating shaft 5A and rotates to move the lock claw to the release position against the urging force of the spring 5D. It is good to have. When no external operating force is applied to the operating shaft 5A, the operating shaft 5A returns to the initial position by the urging force of the spring 5D. When the operation shaft 5A rotates with respect to the backside member 17, the seat back 3 becomes rotatable with respect to the floor 4. An operating lever 5B extending in the radial direction is provided at the end of each operating shaft 5A.

As shown in FIG. 1, the seat cushion 2 has a seat cushion frame 31. A pad is supported on the seat cushion frame 31, and the pad and the seat cushion frame 31 are covered with a skin material. The seat cushion frame 31 has left and right cushion side members 32, a front member 33, a rear member 34, and a center plate 35. The left and right cushion side members 32 extend back and forth with a space between the left and right cushion side members 32. The front member 33 extends to the left and right and is connected to the front ends of the left and right cushion side members 32. The rear member 34 extends to the left and right and is connected to the rear ends of the left and right backside members 17. The center plate 35 extends back and forth and is joined to the front member 33 and the rear member 34.

Left and right rear links 37 extending rearward and upward are connected to the rear ends of the left and right cushion side members 32. The left and right rear links 37 move integrally with the left and right cushion side members 32. The rear ends of the left and right rear links 37 are rotatably supported by the left and right side member lower portions 17B about an axis extending to the left and right. As a result, the seat cushion 2 is rotatably coupled to the seat back 3.

The front ends of the left and right cushion side members 32 are connected to the front ends of the base side member 11 via the left and right front links 38. One end of the front link 38 is rotatably connected to the front end of the cushion side member 32 about an axis extending to the left and right. The other end of the front link 38 is rotatably connected to the front end of the base side member 11 about an axis extending to the left and right.

As shown in FIG. 1, the seat back frame 16 is provided with a first drive device 41 for driving the lock device 5 and an electronic control device 42 for controlling the first drive device 41. The electronic control device 42 includes a CPU, a non-volatile memory (ROM), a volatile memory (RAM), and the like. The first drive device 41 and the electronic control device 42 are arranged vertically side by side on one side of the seat back frame 16 in the left-right direction. In the present embodiment, the first drive device 41 and the electronic control device 42 are arranged side by side on the right side of the seat back frame 16.

As shown in FIG. 4, the electronic control device 42 is coupled to the plate member 24 via the first bracket 44. The first bracket 44 may be welded to the plate member 24, or may be fastened to the plate member 24 by fastening members such as bolts and nuts. The first bracket 44 is coupled to at least one of the flat surface portion 24B and the raised portion 24C so as to overlap the flat surface portion 24B and the raised portion 24C when viewed from a direction orthogonal to the plate member 24. The first bracket 44 has a first portion 44A coupled to the flat surface portion 24B and a second portion 44B that is offset forward with respect to the first portion 44A and abuts on the raised portion 24C. The second portion 44B may be coupled to the raised portion 24C. The electronic control device 42 is fastened to the second portion 44B by fastening members such as bolts and nuts. The first portion 44A may be coupled to the backside member 17 in addition to the flat surface portion 24B.

The electronic control device 42 and the first bracket 44 are arranged at one of the left and right backside members 17 and a corner defined by the upper member 18. In the present embodiment, the electronic control device 42 and the first bracket 44 are arranged at the corners defined by the right side member and the upper member 18. Further, at least a part of the electronic control device 42 is arranged between the corresponding backside member 17 and the headrest support portion 26 on the left and right sides. In the present embodiment, the upper portion of the electronic control device 42 is arranged between the upper portion of the backside member 17 on the right side and the headrest support portion 26 on the right side. Further, the electronic control device 42 and the first bracket 44 are arranged above the first cross member 21. The electronic control device 42 is arranged in a space defined by a backside member 17, a headrest support portion 26, an upper member 18, and a first cross member 21 corresponding to each other on the left and right sides.

The outer shape of the electronic control device 42 may be formed in a shape that does not give a sense of discomfort to the back of the seated person. For example, the outer shape of the left portion of the electronic control device 42 provided on the right side of the seat back 3 may be formed by a surface inclined rearward toward the left. Further, the outer shape of the left portion of the electronic control device 42 may be formed by a smooth curved surface. With this configuration, the electronic control device 42 provided on the seat back 3 can reduce the discomfort given to the back of the seated person.

As shown in FIGS. 1 and 4, the first drive device 41 has a first electric motor 41A and an output unit 41B that is displaced according to the drive of the first electric motor 41A. The first drive device 41 is coupled to the backside member 17 via the second bracket 46. In the present embodiment, the second bracket 46 is a main body portion 46A to which the first drive device 41 is fastened, and at least one first projecting piece portion that protrudes to the right from the main body portion 46A and is coupled to the side member upper portion 17A. It has a 46B and at least one second projecting piece portion 46C that protrudes to the left from the main body portion 46A and is coupled to the flat surface portion 24B or the raised portion 24C portion of the plate member 24. The main body portion 46A, the first projecting piece portion 46B, and the second projecting piece portion 46C may be formed of different members from each other and may be coupled to each other. Further, the main body portion 46A, the first protruding piece portion 46B, and the second protruding piece portion 46C may be formed from one plate member 24.

The first projecting piece portion 46B is curved in a semi-circular shape and extends along the outer circumference of the side member upper portion 17A. In the present embodiment, two first projecting piece portions 46B are arranged vertically at intervals. The upper first projecting piece portion 46B is arranged below the end portion 21A of the first cross member 21. The end portion 21A of the first cross member 21 is bent to the side opposite to the second bracket 46. The two first projecting piece portions 46B may be welded to or fastened to the side member upper portion 17A. Further, the second projecting piece portion 46C may be welded to or fastened to the plate member 24.

The second projecting piece portion 46C and the first driving device 41 are arranged below the electronic control device 42. Further, the second projecting piece portion 46C and the first driving device 41 are arranged below the first cross member 21. That is, the first cross member 21 passes between the first drive device 41 and the electronic control device 42 and extends to the left and right.

As shown in FIG. 4, a relay lever 51 is rotatably provided on the left side of the plate member 24 and on the right side of the backside member 17 on the left side. The relay lever 51 is urged to the initial position by a spring (not shown). The first drive device 41 is connected to the relay lever 51 via the first control cable 52 (transmission member). The relay lever 51 is connected to the operation lever 5B of the lock device 5 on the left side via the second control cable 53 (transmission member), and is connected to the operation lever 5 of the lock device 5 on the right side via the third control cable 54 (transmission member). It is connected to 5B.

At the base end of the operating lever 5B on the right side, a convex portion 5C protruding in the radial direction of the rotation shaft of the operating lever 5B is provided. A sensor 57 for detecting the position of the operating lever 5B is provided at the lower end of the backside member 17. The sensor 57 is a right side surface of the lower side member 17B on the right side, and is arranged around the operation lever 5B. The sensor 57 may be a limit switch that is pushed and rotated by the convex portion 5C of the operating lever 5B. When the seat back 3 is in the seated position, the sensor 57 is placed between the corresponding backside member 17 and the rear link 37. That is, the sensor 57 is arranged between the backside member 17 on the right side and the rear link 37 on the right side. The operating lever 5B is connected to the lower side member 17B via the spring 5D and is urged toward the initial position.

As shown in FIGS. 4 and 5, the base 7 is provided with a second drive device 61 that rotates the seat back frame 16 with respect to the base 7. The second drive device 61 connects the base 7 and the seat back 3, and rotates the seat back 3 with respect to the base 7 by expanding and contracting. The second drive device 61 is coupled to the case 61A, the ball screw nut 61B rotatably supported by the case 61A, the ball screw shaft 61C screwed to the ball screw nut 61B, and the ball screw nut 61A. It has an electric motor 61D that rotates the 61B. The case 61A is rotatably connected to the base cross member 13 via a hinge 63 about an axis extending to the left and right. The hinge 63 is rotatably coupled to the lower hinge bracket 63A, which is fastened to the upper channel material 13B of the base cross member 13, and to the lower hinge bracket 63A about an axis extending to the left and right, and is fastened to the case 61A. It also has an upper hinge bracket 63B. A work hole 13C, which is a through hole, is formed at the bottom of the lower channel material 13A of the base cross member 13. The bolt 13D that fastens the upper channel material 13B and the lower hinge bracket 63A is exposed downward through the work hole 13C. As a result, the operator can perform the fastening work between the upper channel material 13B and the lower hinge bracket 63A through the work hole 13C.

A bracket 64 extending downward is welded to the lower member 19 of the seat back frame 16. The bracket 64 may be welded to the outer surface of the lower side wall of the lower channel member 19A of the lower member 19. The tip of the ball screw shaft 61C is rotatably connected to the bracket 64 about an axis extending to the left and right. In another embodiment, as shown in FIG. 11, it is preferable that the tip of the ball screw shaft 61C is provided with a bent portion 61E bent upward. It is preferable that the bent portion 61E is rotatably coupled to the connecting portion 19F integrally formed with the rear channel material 19A about an axis extending to the left and right. The connecting portion 19F may be formed, for example, by cutting up the rear channel material 19A.

As shown in FIGS. 5 and 12, the second drive device 61 is arranged behind the front end of the seat cushion 2. Specifically, the second drive device 61 is provided on the base cross member 13 behind the front member 33 of the seat cushion frame 31. The second drive device 61 is arranged on the left side of the base cross member 13. The axis of the ball screw shaft 61C extends in the front-rear direction. The axis of the ball screw shaft 61C is orthogonal to the rotation axis of the electric motor 61D in a plan view. With this configuration, since the front end of the second drive device 61 is arranged behind the front member 33 of the seat cushion 2, it is possible to prevent the legs of the seated person from coming into contact with the electric motor 61D.

The electric motor 61D is arranged behind the base cross member 13. The rotation axis of the electric motor 61D extends in the left-right direction and extends substantially parallel to the base cross member 13. The front end of the electric motor 61D is arranged at a distance from the base cross member 13. With this configuration, the distance between the electric motor 61D and the seat back 3 can be shortened, and the ball screw shaft 61C can be shortened. As a result, the drive device can be miniaturized.

The upper wall portion of the electric motor 61D may be above the upper portion of the right portion of the base cross member 13. The upper wall portion of the electric motor 61D may be on the same horizontal plane as the upper portion of the right portion of the base cross member 13. The upper wall portion of the electric motor 61D may be below the upper portion of the right portion of the base cross member 13. With this configuration, the electric motor 61D and the base cross member 13 can be arranged compactly.

As shown in FIGS. 4 and 9, the electronic control device 42 is connected to the first drive device 41 by the first harness 66, is connected to the second drive device 61 by the second harness 67, and is a sensor by the third harness 68. It is connected to 57. The first to third harnesses 66 to 68 are partially bound to each other. A part of the second harness 67 is fastened to the lower member 19 by a plurality of resin fasteners 69 and is arranged along the lower member 19. In another embodiment, a part of the second harness 67 may be fastened to the third cross member 23 by a plurality of resin fasteners 69 and may be arranged along the third cross member 23.

Further, the electronic control device 42 is connected to the operation switch 72 by the fourth harness 71, and is connected to the power supply 75 by the fifth harness 74. The operation switch 72 outputs the first signal according to the first operation of the occupant and outputs the second signal according to the second operation. The first signal is a signal corresponding to the operation of changing the sheet 1 from the usage form to the storage form, and the second signal is a signal corresponding to the operation of changing the sheet 1 from the storage form to the storage form.

Next, the operation of the seat 1 will be described. As shown in FIG. 10A, when the seat 1 is in use, the seat back 3 stands up against the floor 4, and the lock device 5 restricts the rotation of the seat back 3. The seat cushion 2 extends substantially horizontally and is arranged at a distance from the floor 4. When the occupant performs the first operation on the operation switch 72 when the seat 1 is in the usage mode, the first signal is output to the electronic control device 42. The electronic control device 42 drives and controls the first drive device 41 based on the first signal. As a result, the first drive device 41 moves the relay lever 51 from the initial position to the drive position by the first control cable 52. When the relay lever 51 moves from the initial position to the drive position, the second control cable 53 and the third control cable 54 pull the left and right operation levers 5B, and the left and right operation levers 5B move from the lock position to the release position. As a result, the left and right lock devices 5 are released, and the seat back 3 can rotate with respect to the base 7.

When the right operating lever 5B reaches the release position, the sensor 57 is pushed by the convex portion 5C of the operating lever 5B, and the detection signal is output to the electronic control device 42. The electronic control device 42 determines that the operation lever 5B has reached the release position, that is, the lock device 5 has been released, based on the signal from the sensor 57. When the electronic control device 42 determines that the lock device 5 is released, the electronic control device 42 drives and controls the electric motor 61D of the second drive device 61 to extend the second drive device 61. When the electric motor 61D rotates, the ball screw nut 61B rotates with respect to the case 61A, and the ball screw shaft 61C projects rearward with respect to the case 61A. As a result, as shown in FIG. 10B, the lower end portion of the seat back 3 is pushed backward by the second drive device 61, and the upper portion of the seat back 3 rotates forward. At the same time, the seat cushion 2 is pushed by the seat back 3 and moves forward and downward. As a result, the sheet 1 becomes a storage form. The electronic control device 42 detects that the ball screw shaft 61C has reached the longest position based on the drive current of the electric motor 61D of the second drive device 61, and stops the drive of the second drive device 61. Further, the electronic control device 42 measures the elapsed time from the time when the lock device 5 is determined to be released, and stops the driving of the first drive device 41 when the elapsed time reaches a predetermined time. As a result, the locking device 5 is changed from the released state to the locked state by the urging force of the springs 5D of the left and right locking devices 5. As a result, as shown in FIG. 10 (C), the sheet 1 is maintained in the stored form.

When the occupant performs the second operation on the operation switch 72 when the seat 1 is in the retracted form, the second signal is output to the electronic control device 42. The electronic control device 42 drives and controls the first drive device 41 based on the second signal. As a result, the first drive device 41 moves the left and right operation levers 5B from the lock position to the release position via the first control cable 52, the relay lever 51, the second control cable 53, and the third control cable 54. As a result, the left and right lock devices 5 are released, and the seat back 3 can rotate with respect to the base 7.

The electronic control device 42 determines that the operation lever 5B has reached the release position, that is, the lock device 5 has been released, based on the signal from the sensor 57. When the electronic control device 42 determines that the lock device 5 is released, the electronic control device 42 drives and controls the electric motor 61D of the second drive device 61 to contract the second drive device 61. When the electric motor 61D rotates, the ball screw nut 61B rotates with respect to the case 61A, and the ball screw shaft 61C moves forward with respect to the case 61A. As a result, as shown in FIG. 10B, the lower end portion of the seat back 3 is pulled forward by the second drive device 61, and the upper portion of the seat back 3 rotates backward. At the same time, the seat cushion 2 is pulled by the seat back 3 and moves backward and upward. As a result, the sheet 1 becomes a usage form. The electronic control device 42 detects that the ball screw shaft 61C has reached the shortest position based on the drive current of the electric motor 61D of the second drive device 61, and stops the drive of the second drive device 61. Further, the electronic control device 42 measures the elapsed time from the time when the lock device 5 is determined to be released, and stops the driving of the first drive device 41 when the elapsed time reaches a predetermined time. As a result, the locking device 5 is changed from the released state to the locked state by the urging force of the springs 5D of the left and right locking devices 5. As a result, as shown in FIG. 10 (A), the sheet 1 is maintained in the usage mode.

According to the sheet 1 according to the embodiment, the electronic control device 42 can be arranged at a position that does not interfere with the operation of the sheet 1. By arranging the electronic control device 42 on the seat back 3, the thickness of the seat cushion 2 can be reduced. Further, it is possible to secure a space for the seat cushion 2 to move below the seat cushion 2. In addition, the influence of the electronic control device 42 and the first drive device 41 on the back of the occupant can be suppressed.

The first bracket 44 that supports the electronic control device 42 is arranged so as to overlap the flat surface portion 24B and the raised portion 24C in the plate member 24. As a result, the first bracket 44 is arranged in a portion of the plate member 24 having high rigidity, and the first bracket 44 and the electronic control device 42 are stably supported by the seat back frame 16.

The electronic control device 42 is arranged at a corner defined by the upper member 18 and the backside member 17. Further, the electronic control device 42 is arranged in the space defined by the upper member 18, the side member, the first cross member 21, and the headrest pillar. Therefore, the electronic control device 42 can be arranged by effectively utilizing the space formed by the upper member 18, the side member, and the plate member 24. In addition, the influence of the electronic control device 42 on the back of the occupant can be suppressed.

Since the first drive device 41 is arranged below the electronic control device 42, the electronic control device 42 and the first drive device 41 can be arranged in the seat back 3 with high space efficiency. Further, since the first cross member 21 is arranged between the electronic control device 42 and the first drive device 41, the rigidity of the seat back frame 16 at the portion where the electronic control device 42 and the first drive device 41 are attached is increased. Can be improved. Since the end portion 21A of the first cross member 21 coupled to the backside member 17 is bent upward, interference with the second bracket 46 coupled to the backside member 17 can be avoided.

The sheet 200 according to the second embodiment has a different structure around the second drive device 61 as compared with the sheet 1 according to the first embodiment. In the following description, only the different configurations will be described, and the description of the same configurations as the sheet 1 according to the first embodiment will be omitted by referring to the above description.

As shown in FIGS. 13 and 14, in the sheet 200 according to the present embodiment, the base cross member 213 is formed of a pipe material having at least one bent portion 214. The left and right ends of the base cross member 213 are coupled to the vertical wall portion 11B of the corresponding base side member 11. The base cross member 213 is partitioned by a plurality of bends 214 and has a right portion 213A, a central portion 213B, and a left portion 213C. The right portion 213A, the central portion 213B, and the left portion 213C each extend linearly. The right portion 213A is arranged above the left portion 213C. The central portion 213B is inclined upward toward the right. The left portion 213C is formed longer in the left-right direction with respect to the right portion 213A.

A bracket 206 is connected to the left portion 213C of the base cross member 213. The bracket 206 has a main body portion 206A whose surface faces up and down, and left and right side wall portions 206B extending downward from the left and right side edges of the main body portion 206A. A semi-circular recess 206C is formed at the lower end of the side wall portion 206B. The upper portion of the base cross member 213 is received and welded to the recess 206C. A lower hinge bracket 63A is fastened to the main body 206A of the bracket 206. With this configuration, the configuration of the base cross member 213 can be simplified and the rigidity can be improved. Further, the second drive device 61 can be fixed to the curved base cross member 213 via the bracket 206.

The lower member 219 of the seat back frame 16 is formed of a channel material having a groove-shaped cross section that opens toward the front. The lower member 219 has a side wall portion 219A whose surface faces forward and backward, an upper wall portion 219B extending forward from the upper edge of the side wall portion 219A, and a lower wall portion 219C extending forward from the lower edge of the side wall portion 219A. The vertical width of the side wall portion 219A is wider than the front-rear width of the upper wall portion 219B, and the vertical width of the side wall portion 219A is wider than the front-rear width of the lower wall portion 219C. The left and right ends of the side wall portion 219A of the lower member 219 are welded to the inside of the edge wall portion 17D of the corresponding side member lower portion 17B on the left and right. With this configuration, the lower member 219 is coupled to the backside member 17 at the side wall portion 219A which is wider than the upper wall portion 219B and the lower wall portion 219C, so that the rigidity of the coupling portion can be improved.

As shown in FIGS. 14 and 15, a bracket 207 is coupled to the lower member 219. The bracket 207 has a rear wall portion 207A whose surface faces forward and backward, and left and right edge wall portions 207B extending forward from the left and right side edges of the rear wall portion 207A. The rear wall portion 207A and the left and right edge wall portions 207B are formed by bending a sheet metal. The upper end portion 207C of the rear wall portion 207A extends upward from the upper end portion 207C of the left and right edge wall portions 207B, and is in surface contact with the rear surface of the side wall portion 219A of the lower member 219. The upper end portion 207C of the rear wall portion 207A is welded to the rear surface of the side wall portion 219A of the lower member 219. The upper ends of the left and right edge wall portions 207B are in contact with the lower surface of the lower wall portion 219C of the lower member 219 and are welded. The edge wall portion 207B of the bracket 207 extends downward and forward. The left and right edge wall portions 207B face left and right, and correspond to each other through a gap in the left and right directions. The left and right edge wall portions 207B are bent at an intermediate portion in the vertical direction so that the distance between the lower end portions 207D is smaller than the distance between the upper end portions 207C. Support holes 207E penetrating left and right are formed in the lower end portions 207D of the left and right edge wall portions 207B. A shaft 208 is inserted into the support hole 207E. The rear end portion of the ball screw shaft 61C is arranged between the left and right edge wall portions 207B and is rotatably supported by the shaft 208. Since the bracket 207 extends downward and forward, the bracket 207 can compactly accommodate the ball screw shaft 61C under the seat back 3 when the seat 200 is in the retractable form.

As shown in FIG. 16, in an automobile, a luggage compartment 201 is provided behind the seat 200. The floor 4 defining the lower part of the luggage compartment 201 is provided with a recess 220 recessed downward. The recess 220 can store an article 221 such as a tire. A luggage compartment board 202 is provided on the upper surface of the floor 4 so as to cover the recess 220. The luggage compartment board 202 is detachably provided with respect to the floor 4 and extends horizontally. The luggage compartment board 202 is made of, for example, resin.

A cover 203 is provided on the leading edge of the luggage compartment board 202. The cover 203 extends in the left-right direction of the seat 200. When the seat 200 is in the stowed mode, the front end of the cover 203 is arranged on the back surface of the seat back 3. That is, the cover 203 is provided so as to cover the gap between the luggage compartment board 202 and the seat back 3. The cover 203 may be integrally molded with the luggage compartment board 202. When the seat 200 is in the stowed mode, the cover 203 is located above the rear end of the ball screw shaft 61C. When the seat 200 is in use, the bracket 207 extends forward and downward. Therefore, when the seat 200 is in the stowed state, it is possible to prevent the bracket 207 and the rear end of the ball screw shaft 61C from coming into contact with the cover 203. With this configuration, when the seat 200 is in the stored form, the cover 203 can hide the gap between the seat 200 and the luggage compartment board 202 and the rear end of the ball screw shaft 61C.

As shown in FIG. 13, a sensor 204 is provided on the upper portion of the seat cushion 2. Specifically, the sensor 204 is arranged between the upper surface of the pad constituting the seat cushion 2 and the skin material. The sensor 204 is a load sensor that detects a load. The sensor 204 may be, for example, a piezoelectric element, a membrane switch that deforms according to a load and is connected to contacts, or the like. The sensor 204 is provided to detect whether or not an object is present on the seat cushion 2. In the present embodiment, the sensor 204 is a membrane switch and outputs an ON signal when a load of a predetermined value or more is applied.

When viewed from the front-rear direction, at least a part of the sensor 204 is arranged at a position overlapping with the second drive device 61 in the vertical direction. With this configuration, the sensor 204 and the second drive device 61 can be arranged without increasing the left-right width of the seat cushion 2.

The sensor 204 is connected to the electronic control device 42. The sensor 204 outputs a signal to the electronic control device 42 according to the detected pressure. The electronic control device 42 regulates the deformation from the usage mode to the storage mode when it is determined that an object exists on the seat cushion 2 based on the signal from the sensor 204. Specifically, the electronic control device 42 prohibits the driving of the first driving device 41 when the ON signal is received from the sensor 204. With this configuration, it is possible to prevent the seat 200 from changing to the storage form when an object is placed on the seat cushion 2 or when a seated person is present.

Further, instead of the sensor 204, the pinching of the object by the seat cushion 2 and the seat back 3 may be detected by another sensor. The sensor may be, for example, a strain sensor 222 provided between the bracket 63B and the case 61A, as shown in FIG. The strain sensor 222 is a known strain sensor, and outputs a signal corresponding to the strain to the electronic control device 42. When an object is sandwiched between the seat cushion 2 and the seat back 3, the seat back 3 with respect to the seat cushion 2 is restricted. At this time, since the ball screw shaft 61C tends to move backward with respect to the case 61A, the strain sensor 222 is compressed between the bracket 63B and the case 61A. Thereby, the electronic control device 42 can detect the pinching of the object by the seat cushion 2 and the seat back 3 based on the signal from the strain sensor 222. By using the strain sensor 222, the sensor 204 can be omitted and the structure of the seat cushion 2 can be simplified. In another embodiment, the electronic control device 42 may detect pinching of an object by the seat cushion 2 and the seat back 3 based on the current flowing through the electric motor 61D.

The sheet 200 is provided with an indicator 205. The indicator 205 is a display device including, for example, an LED. The indicator 205 may be located at the upper left end of the seat back 3. The indicator 205 is connected to the electronic control device 42. The electronic control device 42 lights the indicator 205 when the ball screw shaft 61C is in the longest position and the operation lever 5B is in the initial position. With this configuration, the user can visually confirm that the seat 200 has completely changed to the storage form. In another embodiment, the electronic control device 42 may turn on the indicator 205 when the operating lever 5B is not in the initial position. In this case, the user can visually confirm that the lock device 5 is in the released state.

The method for manufacturing a vehicle seat includes a step of rotatably providing a seat back 3 on a base 7, a step of rotatably providing a seat cushion 2 on the seat back 3, and a step of rotating the seat back 3 with respect to the base 7. It is preferable to have a step of connecting the driving device 61 to be connected to the base 7 and the seat back 3 and providing the driving device 61 behind the front end of the seat cushion 2. According to this aspect, the vehicle seats 1 and 200 provided with the second drive device 61 can be unitized. This facilitates attachment of the vehicle seats 1 and 200 to the vehicle.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment.

1, 200: Seat 2: Seat cushion 3: Seat back 4: Floor 5: Lock device 5A: Operation shaft 5B: Operation lever 5C: Convex part 7: Base 13, 213: Base cross member 16: Seat back frame 17: Back Side member 18: Upper member 19: Lower member 21: First cross member 21A: End part 24: Plate member 24B: Flat surface part 24C: Raised part 26: Headrest support part 37: Rear link 41: First drive device 41A: First electric Motor 42: Electronic control device 44: First bracket 46: Second bracket 57: Sensor 61: Second drive device 67: Second harness 201: Luggage chamber 202: Luggage compartment board 203: Cover 204: Sensor 205: Indicator 206: Bracket 207: Bracket

Claims (11)

It ’s a vehicle seat,
The base on the floor and
The seat back that is rotatably provided on the base and
A seat cushion rotatably provided on the seat back and
It has a drive device that is connected to the base and the seat back and rotates the seat back with respect to the base.
The drive device is a vehicle seat arranged behind the front end of the seat cushion. The base has left and right base side members extending back and forth, and a base cross member extending left and right and connected to the left and right base side members.
The drive device includes a case supported by the base cross member, a nut rotatably supported by the case, an electric motor coupled to the case and generating a driving force to rotate the nut, and the nut. The vehicle seat according to claim 1, further comprising a screw shaft that is screwed into a screw shaft that extends back and forth and is rotatably connected to the seat back at the rear end. The vehicle seat according to claim 2, wherein the case is coupled to the base cross member via a hinge. The vehicle seat according to claim 2 or 3, wherein the base cross member is formed of a pipe material having at least one bent portion. The seat back has a left and right back side member and a lower member that extends left and right and is connected to the left and right back side members.
The vehicle seat according to any one of claims 2 to 4, wherein the rear end of the screw shaft is rotatably connected to the lower member. The left and right backside members have a plate-shaped main body portion whose surface faces left and right, and an edge wall portion protruding inward from the edge of the main body portion.
The vehicle seat according to claim 5, wherein the lower member has a groove-shaped cross section and has a first channel material welded to the edge wall portion at the left and right ends. The lower member has a second channel material having a grooved cross section that is disposed inside the first channel material and is coupled to the first channel material.
The vehicle seat according to claim 6, wherein the rear end of the screw shaft is connected to the first channel material at a position corresponding to the second channel material in the left-right direction. The lower member is provided with a bracket that rotatably supports the screw shaft.
A claim that the bracket extends downward and forward from the lower member in a state where the seat back extends vertically, and rotatably supports the rear end of the screw shaft at a tip portion about an axis extending left and right. The vehicle seat according to 7. The vehicle seat according to any one of claims 2 to 8, wherein the electric motor is arranged behind the base cross member. The vehicle seat according to any one of claims 2 to 9, wherein the rotating shaft of the electric motor extends in the left-right direction, and the axis of the screw shaft extends in the front-rear direction in a plan view. It is a method of manufacturing vehicle seats.
The process of rotatably providing the seat back on the base and
The process of rotatably providing a seat cushion on the seat back and
A method for manufacturing a vehicle seat, comprising a step of connecting a driving device for rotating the seat back with respect to the base to the base and the seat back, and providing the seat back behind the front end of the seat cushion.

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