Vehicle seat and manufacturing method of vehicle seat

Abstract

To provide a vehicle sheet which can improve stability of the vehicle sheet.SOLUTION: A vehicle seat 1 includes right and left lower rails 3 which are provided on a floor 2 and are elongated back and forth, right and left upper rails 4 which are slide-movably supported on each of the lower rail and a seat body 5 supported on each of the upper rail. The seat body includes a seat cushion 15 which supports buttocks of a user and a seat back 16 which is elongates to the upper side from the seat cushion and supports a back part of the user. The seat back has a seat back frame 31 which forms a skeleton. The seat back frame has right and left seat back side members 41 extended vertically. A first seat back side member 41A has a closed cross section structure formed with a plurality of metal plates which are welded to each other. When viewed from the upper side, the first seat back side member is arranged between right edge and left edge of the lower rail corresponding to on left and right.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle seat and a method for manufacturing a vehicle seat. [Background technology]

[0002] Patent Document 1 discloses a vehicle seat. The vehicle seat has a seatback frame that constitutes a seatback. The seatback frame has left and right seatback side members that extend vertically, an upper member that extends horizontally and is joined to the upper ends of the left and right seatback side members, and a lower member that extends horizontally and is joined to the lower parts of the left and right seatback side members. The right seatback side member is formed by welding two channel-shaped steel plates and has a closed cross-sectional structure. The closed cross-sectional structure improves the rigidity of the right seatback side member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-154738 A Summary of the Invention [Problem to be solved by the invention]

[0004] The seat back is supported on the floor via a seat cushion and slide rails, so the position of the seat back relative to the slide rails significantly affects the stability of the seat.

[0005] In view of the above background, an object of the present invention is to improve the stability of a vehicle seat and to provide a method for manufacturing a vehicle seat with improved stability. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present invention is a vehicle seat (1) comprising: left and right lower rails (3) provided on a floor (2) and extending in the front-rear direction; left and right upper rails (4) slidably supported on each of the lower rails; and a seat body (5) supported on each of the upper rails, the seat body comprising a seat cushion (15) supporting a user's buttocks; and a seat back (16) extending upward from the seat cushion and supporting the user's back, the seat back having a seat back frame (31) forming a skeleton, the seat back frame having left and right seat back side members (41A, 41B) extending vertically, one of the left and right seat back side members being a first seat back side member (41A) having a closed cross-sectional structure formed by a plurality of metal plates welded to each other, and when viewed from above, the first seat back side member is disposed between a right edge and a left edge of one of the lower rails.

[0007] According to this embodiment, since the first seatback frame having a closed cross-sectional structure is disposed on the lower rail, a moment is less likely to be applied to the seatback, and the stability of the seat is improved.

[0008] In the above aspect, the seat cushion has a seat cushion frame (21) that forms a skeleton, and the seat cushion frame has left and right seat cushion side members (25A, 25B) extending in the front-rear direction, one of the left and right seat cushion side members is a first seat cushion side member (25A) that is rotatably connected to the first seatback side member at its rear end, and the first seat cushion side member may be arranged along the outer edges in the left-right direction of the corresponding lower rails on the left and right when viewed from above.

[0009] According to this aspect, the load path of the load transmitted from the seat back to the floor via the seat cushion is linear, thereby improving the stability of the seat.

[0010] In the above aspect, a belt guide (62) through which a seat belt (61) passes may be provided at an upper end of the first seatback side member, and at least a portion of the belt guide may be disposed between one right edge and one left edge of the lower rail when viewed from above.

[0011] According to this aspect, the load applied from the seat belt to the belt guide is transmitted to the floor via the first seatback side member, the first seat cushion side member, the upper member, and the lower member, which makes the load path linear, thereby improving the stability of the seat.

[0012] In the above aspect, the first seatback side member may be provided with a belt retractor (63) for winding up the seat belt.

[0013] According to this embodiment, the load applied to the belt retractor is transmitted to the first seatback side member.

[0014] In the above aspect, the seat cushion frame has a front member (26) extending left and right and connected to front portions of the left and right seat cushion side members, the front member being formed in a plate shape with a surface facing up and down, and the left and right side edges of the front member may overlap with the left and right lower rails when viewed from above.

[0015] According to this aspect, a moment is unlikely to be generated in the seat cushion in response to a load applied to the seat cushion by a user seated on the seat.

[0016] In the above aspect, a plate-shaped ottoman (71) may be rotatably supported on the seat cushion frame, and the left and right side edges of the ottoman may be positioned between the left edge of the left lower rail and the right edge of the right lower rail when viewed from above.

[0017] According to this aspect, a moment is unlikely to be generated in the seat cushion due to a load applied to the ottoman, and the ottoman can be made larger.

[0018] In the above aspect, the left and right seat cushion side members may have a second seat cushion side member (25B) different from the first seat cushion side member, the second seat cushion side member may be provided with a side wall portion (81) extending upward and with a surface facing left and right, a table (82) is rotatably supported on the side wall portion, and a storage recess (83) for accommodating the table is provided in the side wall portion, and the side wall portion may be positioned in the left-right direction more inward than the outer edge of the lower rail corresponding to the second seat cushion side member when viewed from above.

[0019] According to this aspect, a moment is unlikely to be generated in the seat cushion due to a load applied to the table and the side wall portion.

[0020] In the above aspect, the side wall portion may be disposed along the outer edge in the left-right direction of the lower rail corresponding to the second seat cushion side member in the left-right direction when viewed from above.

[0021] According to this aspect, the seat cushion can be increased in size while suppressing the moment generated in the seat cushion.

[0022] In the above aspect, a wire harness supplying device (91) that accommodates a wire harness connected to a power source is provided at an end of the lower rail that corresponds to the first seatback side member in the left-right direction, and the wire harness may extend from the wire harness supplying device through the lower rail to the upper rail.

[0023] According to this aspect, the wire harness can be disposed inside the lower rail.

[0024] Another aspect of the present invention is a manufacturing method for a vehicle seat, the method comprising the steps of attaching left and right lower rails (3) that slidably support left and right upper rails (4), respectively, to a floor (2), and attaching a seat body (5) to the left and right upper rails, the seat body having a seat cushion (15) that supports a user's buttocks, and a seat back (16) that extends upward from the seat cushion and supports the user's back, the seat back having a seat back frame (31) that forms a skeleton, the seat back frame having left and right seat back side members (41A, 41B) that extend vertically, one of the left and right seat back side members being a first seat back side member (41A) having a closed cross-sectional structure formed by a plurality of steel plates welded to each other, and the first seat back side member may be disposed between a right edge and a left edge of one of the lower rails when viewed from above.

[0025] According to this aspect, it is possible to provide a manufacturing method for a vehicle seat with improved stability. Effect of the Invention

[0026] One aspect of the present invention is a vehicle seat (1) having left and right lower rails (3) provided on a floor (2) and extending in the front-rear direction, left and right upper rails (4) supported slidably on each of the lower rails, and a seat body (5) supported on each of the upper rails, the seat body having a seat cushion (15) supporting a user's buttocks, and a seat back (16) extending upward from the seat cushion and supporting the user's back, the seat back having a seat back frame (31) forming a skeleton, the seat back frame having left and right seat back side members (41) extending vertically, one of the left and right seat back side members being a first seat back side member (41A) having a closed cross-sectional structure formed by a plurality of metal plates welded to each other, and when viewed from above, the first seat back side member is disposed between the right edge and the left edge of one of the lower rails.

[0027] According to this embodiment, since the first seatback frame having a closed cross-sectional structure is disposed on the lower rail, a moment is less likely to be applied to the seatback, and the stability of the seat is improved.

[0028] In the above aspect, the seat cushion has a seat cushion frame (21) that forms a skeleton, and the seat cushion frame has left and right seat cushion side members (25) extending in the front-rear direction, one of the left and right seat cushion side members is a first seat cushion side member (25A) whose rear end is rotatably connected to the first seatback side member, and when viewed from above, the first seat cushion side member may be arranged along the outer edges in the left-right direction of the corresponding lower rails on the left and right.

[0029] According to this aspect, the load path of the load transmitted from the seat back to the floor via the seat cushion is linear, thereby improving the stability of the seat.

[0030] In the above aspect, a belt guide (62) through which a seat belt (61) passes may be provided at an upper end of the first seatback side member, and at least a portion of the belt guide may be disposed between one right edge and one left edge of the lower rail when viewed from above.

[0031] According to this aspect, the load applied from the seat belt to the belt guide is transmitted to the floor via the first seatback side member, the first seat cushion side member, the upper member, and the lower member, which makes the load path linear, thereby improving the stability of the seat.

[0032] In the above aspect, the first seatback side member may be provided with a belt retractor (63) for winding up the seat belt.

[0033] According to this embodiment, the load applied to the belt retractor is transmitted to the first seatback side member.

[0034] In the above aspect, the seat cushion frame has a front member (26) extending left and right and connected to front portions of the left and right seat cushion side members, the front member being formed in a plate shape with a surface facing up and down, and the left and right side edges of the front member may overlap with the left and right lower rails when viewed from above.

[0035] According to this aspect, a moment is unlikely to be generated in the seat cushion in response to a load applied to the seat cushion by a user seated on the seat.

[0036] In the above aspect, a plate-shaped ottoman (71) may be rotatably supported on the seat cushion frame, and the left and right side edges of the ottoman may be positioned between the left edge of the left lower rail and the right edge of the right lower rail when viewed from above.

[0037] According to this aspect, a moment is unlikely to be generated in the seat cushion due to a load applied to the ottoman, and the ottoman can be made larger.

[0038] In the above aspect, the left and right seat cushion side members may have a second seat cushion side member (25B) different from the first seat cushion side member, the second seat cushion side member may be provided with a side wall portion (81) extending upward and with a surface facing left and right, a table (82) is rotatably supported on the side wall portion, and a storage recess (83) for accommodating the table is provided in the side wall portion, and the side wall portion may be positioned in the left-right direction more inward than the outer edge of the lower rail corresponding to the second seat cushion side member when viewed from above.

[0039] According to this aspect, a moment is unlikely to be generated in the seat cushion due to a load applied to the table and the side wall portion.

[0040] In the above aspect, the side wall portion may be disposed along the outer edge in the left-right direction of the lower rail corresponding to the second seat cushion side member in the left-right direction when viewed from above.

[0041] According to this aspect, the seat cushion can be increased in size while suppressing the moment generated in the seat cushion.

[0042] In the above aspect, a wire harness supplying device (91) that accommodates a wire harness connected to a power source is provided at an end of the lower rail that corresponds to the first seatback side member in the left-right direction, and the wire harness may extend from the wire harness supplying device through the lower rail to the upper rail.

[0043] According to this aspect, the wire harness can be disposed inside the lower rail.

[0044] Another aspect of the present invention is a manufacturing method for a vehicle seat, the method comprising the steps of attaching left and right lower rails (3) that support left and right upper rails (4) respectively so that they are slidable to a floor (2), and attaching a seat body (5) to the left and right upper rails, the seat body having a seat cushion (15) that supports a user's buttocks, and a seat back (16) that extends upward from the seat cushion and supports the user's back, the seat back having a seat back frame (31) that forms a skeleton, the seat back frame having left and right seat back side members (41) that extend vertically, one of the left and right seat back side members being a first seat back side member (41A) having a closed cross-sectional structure formed by a plurality of steel plates welded to each other, and the first seat back side member may be disposed between a right edge and a left edge of one of the lower rails when viewed from above.

[0045] According to this aspect, it is possible to provide a manufacturing method for a vehicle seat with improved stability. [Brief description of the drawings]

[0046] [Figure 1] FIG. 1 is a perspective view of a vehicle seat according to an embodiment; [Diagram 2] FIG. 11 is a perspective view showing a frame of a first seat body; [Diagram 3] FIG. 13 is a perspective view showing a base of a first seat body; [Figure 4] FIG. 4 is a plan view showing a frame of the first seat body and a first slide rail; [Diagram 5] FIG. 1 is a schematic diagram showing a first seat body, a second seat body, and a first slide rail; [Figure 6] 1A, 1B, and 1C are explanatory diagrams showing an example of a positional relationship between a first seat cushion side member and a first slide rail; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the drawings. In the following embodiment, the vehicle seat constitutes a right seat of an automobile.

[0048] 1, the vehicle seat 1 has left and right lower rails 3 that are provided on a vehicle floor 2 and extend in the front-rear direction, left and right first upper rails 4 that are slidably supported on the lower rails 3, respectively, and a first seat body 5 that is supported on the first upper rails 4. The first seat body 5 constitutes a second or third row seat of the vehicle. The lower rails 3 and the first upper rails 4 constitute a first slide rail 6.

[0049] The vehicle seat 1 also has left and right second upper rails 8 and a second seat body 9 coupled to each of the second upper rails 8. The left and right second upper rails 8 are disposed forward of the left and right first upper rails 4. The second seat body 9 is disposed forward of the first seat body 5. The second seat body 9 constitutes a first or second row seat of the vehicle. The second seat body 9 has a seat cushion 9A coupled to the left and right second upper rails 8, a seat back 9B extending upward from a rear portion of the seat cushion 9A, and a headrest 9C provided on an upper portion of the seat back 9B.

[0050] As shown in FIGS. 2, 3, and 4, the second seat body 9 is coupled to the left and right first upper rails 4 via a base 11 and front and rear second slide rails 12.

[0051] The base 11 has left and right upper rail brackets 11A joined to the upper portions of the first upper rail 4, and front and rear cross members 11B extending in the left-right direction and joining the left and right upper rail brackets 11A. The upper rail brackets 11A protrude upward from the first upper rail 4 and extend in the front-rear direction along the first upper rail 4. The front cross member 11B is joined to the front ends of the left and right upper rail brackets 11A. The rear cross member 11B is joined to the rear ends of the left and right upper rail brackets 11A. The cross members 11B are disposed above and spaced apart from the floor 2. The base 11 may have a lower cross member 11C extending in the left-right direction and joining the lower portions of the left and right upper rail brackets 11A.

[0052] The front and rear second slide rails 12 are arranged at a distance from each other in the front-rear direction. Each of the second slide rails 12 has a horizontal lower rail 12A extending left and right, and a horizontal upper rail 12B supported on the horizontal lower rail 12A so as to be slidable. The horizontal lower rail 12A of the front second slide rail 12 is joined to the upper surface of the front cross member 11B. The horizontal lower rail 12A of the rear second slide rail 12 is joined to the upper surface of the rear cross member 11B.

[0053] The distance from the front end of the front horizontal lower rail 12A to the rear end of the rear horizontal lower rail 12A may be shorter than the front-rear length of the upper rail bracket 11A. This allows the front and rear second slide rails 12 to be stably supported by the upper rail bracket 11A. The distance from the front end of the front horizontal lower rail 12A to the rear end of the rear horizontal lower rail 12A may be longer than the front-rear length of the upper rail bracket 11A. This allows the front and rear second slide rails 12 to support the seat body with good stability. The distance from the front end of the front horizontal lower rail 12A to the rear end of the rear horizontal lower rail 12A may be the same as the front-rear length of the upper rail bracket 11A.

[0054] The second seat body 9 has a seat cushion 15 that supports the buttocks of the user, and a seat back 16 that extends upward from the seat cushion 15 and supports the back of the user. A headrest 17 is provided on the upper part of the seat back 16. The seat cushion 15 has a seat cushion frame 21 that forms a skeleton, a pad 22 supported by the seat cushion frame 21, and a cover material 23 that covers the pad 22. The seat cushion frame 21 has left and right seat cushion side members 25A and 25B that extend forward and backward, a front member 26 that extends left and right and is connected to the front parts of the left and right seat cushion side members 25A and 25B, and a rear member 27 that extends left and right and is connected to the rear parts of the left and right seat cushion side members 25A and 25B. The front member 26 is formed in a plate shape with its surface facing up and down. The front member 26 is also called a pan frame.

[0055] The right seat cushion side member 25A is a first seat cushion side member 25A, and the left seat cushion side member 25B is a second seat cushion side member 25B.

[0056] The seat back 16 includes a seat back frame 31 forming a skeleton, a first pad 32 and a second pad 33 supported by the seat back frame 31, a first covering material 35 covering the first pad 32, and a second covering material 36 covering the second pad 33. The seat back frame 31 includes left and right seat back side members 41A and 41B extending vertically, an upper member 42 extending horizontally and connected to upper ends of the left and right seat back side members 41A and 41B, a lower member 43 extending horizontally and connected to lower parts of the left and right seat back side members 41A and 41B, and a movable frame 45. The lower ends of the left and right seat back side members 41A and 41B are rotatably supported by the rear ends of the corresponding seat cushion side members 25A and 25B via reclining devices 47.

[0057] One of the left and right seatback side members 41A, 41B is a first seatback side member 41A having a closed cross-sectional structure formed by a plurality of metal plates welded together. In this embodiment, the right seatback side member 41A is the first seatback side member 41A. The left seatback side member 41B, which is opposite to the first seatback side member 41A in the left-right direction, is the second seatback side member 41B. As shown in FIG. 6, the first seatback side member 41A is formed by a first member 49A having a groove-shaped cross section and a second member 49B having a groove-shaped cross section. The first member 49A and the second member 49B may be formed by press-molding metal plates. The first member 49A and the second member 49B are welded to each other at their edges, so that the first seatback side member 41A is formed in a rectangular tube shape. The cross section of the first seatback side member 41A is formed in a rectangular shape extending in the front-rear direction.

[0058] The second seatback side member 41B is formed of a metal plate. The second seatback side member 41B may have a closed cross-sectional structure. The upper member 42 is formed of a plurality of metal plates welded together and has a closed cross-sectional structure.

[0059] In the left-right direction, the right lower rail 3 corresponds to the first seatback side member 41A and the first seat cushion side member 25A. In addition, in the left-right direction, the left lower rail 3 corresponds to the second seatback side member 41B and the second seat cushion side member 25B.

[0060] As shown in Fig. 2, a movable frame 45 is rotatably supported by the left and right seatback side members 41A, 41B. The movable frame 45 has a central portion 45A extending in the left and right direction and left and right side portions 45B extending downward from the left and right ends of the central portion 45A. The lower ends of the left and right side portions 45B are respectively connected to the corresponding left and right seatback side members 41A, 41B on the left and right sides so as to be rotatable about a rotation axis extending in the left and right direction. The central portion 45A is provided with left and right headrest support portions 51 for supporting left and right headrest pillars extending from the headrest 17.

[0061] As shown in FIG. 1, the first pad 32 is supported by the lower parts of the left and right seatback side members 41A and 41B and the lower member 43. The lower parts of the left and right seatback side members 41A and 41B, the lower member 43, the first pad 32, and the first skin material 35 constitute the seatback lower part 16A. The second pad 33 is supported by the movable frame 45. The movable frame 45, the second pad 33, and the second skin material 36 constitute the seatback upper part 16B. The seatback upper part 16B is disposed above the seatback lower part 16A. The seatback upper part 16B is rotatable about a rotation axis relative to the seatback lower part 16A. A backboard 53 is disposed behind the seatback lower part 16A and the seatback upper part 16B. The backboard 53 is supported by the left and right seatback side members 41A and 41B, the upper member 42, and the lower member 43.

[0062] A belt guide 62 through which the seat belt 61 passes is provided at the upper end of the first seat back side member 41A. The belt guide 62 has a hole 62A that opens forward. The first seat back side member 41A is provided with a belt retractor 63 that winds up the seat belt 61. As shown in FIG. 4, the first seat back side member 41A is provided with a bracket 64 that protrudes to the left. The bracket 64 is disposed between the lower member 43 and the lower end of the movable frame 45 in the up-down direction. The belt retractor 63 is coupled to the bracket 64. As shown in FIG. 1, the seat belt 61 pulled out from the belt retractor 63 passes behind the first seat back side member 41A and extends upward to the belt guide 62. Thereafter, the seat belt 61 passes through the belt guide 62 from the rear to the front and extends to the front of the seat back 16. An end of the seat belt 61 is coupled to a belt anchor 66 provided on the first seat cushion side member 25A (see FIG. 2). A tongue 67 is movably supported by the seat belt 61. A buckle that is detachably coupled to the tongue 67 is preferably coupled to the left seat cushion side member 25B.

[0063] As shown in Fig. 1, a plate-shaped ottoman 71 is rotatably supported on the seat cushion frame 21. As shown in Fig. 4, the ottoman 71 is connected to the left and right seat cushion side members 25A, 25B via a rotation mechanism 72. The ottoman 71 is disposed in front of the front member 26 and is rotatable relative to the front member 26. The ottoman 71 has a plate-shaped ottoman frame 71A connected to the rotation mechanism 72, a pad supported by the ottoman frame 71A, and a cover material covering the pad.

[0064] As shown in FIG. 1, the second seat cushion side member 25B is provided with a side wall portion 81 that extends upward and has a surface facing left and right. As shown in FIG. 1, FIG. 2, and FIG. 4, the side wall portion 81 has a frame 81A that is joined to the second seat cushion side member 25B and a cover 81B that covers the frame 81A. A table 82 is supported on the side wall portion 81 so as to be rotatable. The side wall portion 81 is provided with an accommodation recess 83 that accommodates the table 82. The accommodation recess 83 is recessed downward from the upper end of the side wall portion 81. A slide device is provided in the accommodation recess 83 to support the table 82 so as to be movable in the up and down direction. The table 82 rotates around a rotation shaft that extends forward and backward while protruding from the accommodation recess 83. The table 82 is rotatable between an upright position in which the table 82 extends upward from the upper end of the side wall portion 81 and a use position in which the table 82 extends rightward from the upper end of the side wall portion 81 and is located above the seat cushion 15.

[0065] As shown in FIG. 1 and FIG. 5, at least one end of the left and right lower rails 3 is provided with a wire harness supplying device 91 that accommodates a wire harness connected to a power source. The rear wire harness supplying device 91 is provided at the rear end of one of the left and right lower rails 3. The front wire harness supplying device 91 is provided at the front end of one of the left and right lower rails 3. In this embodiment, the rear wire harness supplying device 91 is provided at the rear end of the right lower rail 3. The front wire harness supplying device 91 is provided at the front end of the left lower rail 3. In another embodiment, the front and rear wire harness supplying devices 91 may be provided on the right lower rail 3. In another embodiment, the front and rear wire harness supplying devices 91 may be provided on the left lower rail 3. The front and rear wire harness supplying devices 91 may be provided on the lower rail 3 on the same side, or on the lower rails 3 on different sides.

[0066] Each wire harness supplying device 91 has an internal tensioner (not shown). The wire harness supplying device 91 has an entrance 91B facing the end of the lower rail 3. The wire harness supplying device 91 extends from the end of the lower rail 3 along the side of the lower rail 3. The wire harness supplying device 91 may be disposed in a rail groove 92 formed in the floor 2 together with the lower rail 3.

[0067] The wire harness extending from the rear wire harness supplying device 91 extends forward within the right lower rail 3 and is fixed to the right first upper rail 4. The wire harness extends from the first upper rail 4 to electrical components provided in the first seat body 5. The electrically powered components may include an electric motor provided in the first upper rail 4, an electric motor that drives the reclining mechanism, an electric motor that drives the movable frame 45, a blower, a heater, an electronic control device, etc.

[0068] The wire harness extending from the front wire harness supply device 91 extends rearward within the left lower rail 3 and is fixed to the left second upper rail 8. The wire harness extends from the second upper rail 8 to electrical components provided in the second seat body 9. The electrically powered components may include an electric motor provided in the second upper rail 8, an electric motor that drives the reclining mechanism, a blower, a heater, an electronic control device, etc.

[0069] The following describes the positional relationship between each component of the first seat body 5 and the lower rail 3. In the following description, the second slide rail 12 is assumed to be in its initial position. In the initial position of the second slide rail 12, the horizontal upper rail 12B is disposed in the center of the horizontal lower rail 12A in the left-right direction. Note that the second slide rail 12 may be omitted, and the left and right seat cushion side members 25A, 25B may be directly coupled to the base 11 or the left and right first upper rails 4.

[0070] 6(A), when viewed from above, the first seatback side member 41A is disposed between the right edge and the left edge of the right-side lower rail 3. According to this embodiment, since the first seatback side member 41A having a closed cross-sectional structure is disposed on the right-side lower rail 3, a moment is less likely to be applied to the seatback 16, improving the stability of the seat.

[0071] 6(B), the first seatback side member 41A may be disposed so as to overlap with the right edge of the right lower rail 3 when viewed from above. That is, when viewed from above, the right end of the first seatback side member 41A may be disposed to the right of the right edge of the right lower rail 3, and the left end of the first seatback side member 41A may be disposed to the left of the right edge of the right lower rail 3. According to this embodiment, the seatback 16 can be expanded to the right.

[0072] 6(C), the first seatback side member 41A may be disposed so as to overlap the left edge of the right-side lower rail 3 when viewed from above. That is, when viewed from above, the left end of the first seatback side member 41A may be disposed to the left of the left edge of the right-side lower rail 3, and the right end of the first seatback side member 41A may be disposed to the right of the right edge of the right-side lower rail 3. According to this embodiment, the seatback 16 can be made compact.

[0073] As shown in FIG. 4, the first seat cushion side member 25A is disposed along the outer edge of the corresponding lower rail 3 in the left-right direction when viewed from above. According to this embodiment, the load path of the load transmitted from the seat back 16 to the floor 2 via the seat cushion 15 becomes linear. This improves the stability of the seat. When viewed from above, the right end of the first seat cushion side member 25A may be disposed to the left of the right end of the right lower rail 3. According to this embodiment, the seat cushion frame 21 can be made compact. When viewed from above, the right end of the first seat cushion side member 25A may be disposed to the right of the right end of the right lower rail 3. According to this embodiment, the seat cushion frame 21 can be enlarged.

[0074] When viewed from above, at least a part of the belt guide 62 is disposed between the right edge and the left edge of the right lower rail 3. According to this embodiment, the load applied from the seat belt 61 to the belt guide 62 is transmitted to the floor 2 via the first seatback side member 41A and the first seat cushion side member 25A. This makes the load path linear, improving the stability of the seat. When viewed from above, the belt guide 62 may be disposed so as to overlap with the left edge of the right lower rail 3. When viewed from above, the belt guide 62 may be disposed to the left of the right edge of the right lower rail 3. When viewed from above, the right end of the belt guide 62 may be disposed along the right edge of the right lower rail 3. When viewed from above, the right end of the belt guide 62 may be disposed to the right of the right edge of the right lower rail 3.

[0075] When viewed from above, the left and right side edges of the front member 26 may overlap the left and right lower rails 3. According to this embodiment, a moment is unlikely to be generated in the seat cushion 15 in response to a load applied to the seat cushion 15 by a user seated on the vehicle seat 1. When viewed from above, the right side edge of the front member 26 may be disposed to the left of the right edge of the right lower rail 3, and the left side edge of the front member 26 may be disposed to the right of the left edge of the left lower rail 3. When viewed from above, the right side edge of the front member 26 may be disposed along the right edge of the right lower rail 3, and the left side edge of the front member 26 may be disposed along the left edge of the left lower rail 3. When viewed from above, the right side edge of the front member 26 may be disposed to the right of the right edge of the right lower rail 3, and the left side edge of the front member 26 may be disposed to the left of the left edge of the left lower rail 3.

[0076] When viewed from above, the left and right side edges of the ottoman 71 may be disposed between the left edge of the left lower rail 3 and the right edge of the right lower rail 3. According to this embodiment, a moment is unlikely to be generated in the seat cushion 15 due to a load applied to the ottoman 71. In addition, the size of the ottoman 71 can be increased. When viewed from above, the right side edge of the ottoman 71 may be disposed along the right edge of the right lower rail 3, and the left side edge of the ottoman 71 may be disposed along the left edge of the left lower rail 3. When viewed from above, the right side edge of the ottoman 71 may be disposed to the right of the right edge of the right lower rail 3, and the left side edge of the ottoman 71 may be disposed to the left of the left edge of the left lower rail 3.

[0077] When viewed from above, the side wall portion 81 may be disposed more inwardly than the outer edge in the left-right direction of the lower rail 3 corresponding to the second seat cushion side member 25B. That is, when viewed from above, the side wall portion 81 may be disposed more inwardly than the outer edge in the left-right direction of the left lower rail 3. According to this embodiment, a moment is less likely to be generated in the seat cushion 15 due to a load applied to the table 82 and the side wall portion 81.

[0078] When viewed from above, the side wall portion 81 may be disposed along the outer edge in the left-right direction of the lower rail 3 corresponding to the second seat cushion side member 25B in the left-right direction. That is, the side wall portion 81 may be disposed along the left edge of the left lower rail 3. According to this embodiment, the seat cushion 15 can be increased in size while suppressing the moment generated in the seat cushion 15. When viewed from above, the left edge of the side wall portion 81 may be disposed to the right of the left edge of the left lower rail 3. When viewed from above, the left edge of the side wall portion 81 may be disposed to the left of the left edge of the left lower rail 3.

[0079] The second seatback side member 41B is provided with a shaft portion 95 that protrudes to the left. An operating lever 96 is rotatably supported on the shaft portion 95. A user can rotate the seatback upper portion 16B by operating the operating lever 96. The left end of the shaft portion 95 may be located at the same position as the left edge of the left lower rail 3. The left end of the shaft portion 95 may be located to the right of the left edge of the left lower rail 3. The left end of the shaft portion 95 may be located to the left of the left edge of the left lower rail 3.

[0080] When the first seat body 5 is positioned at the rearmost position relative to the left and right lower rails 3, the front end of the ottoman 71 of the first seat body 5 may be disposed rearward of the front end of the rear wire harness supplying device 91. At this time, the ottoman 71 may be in a position extending forwardmost relative to the seat cushion 15. In another embodiment, when the first seat body 5 is positioned at the rearmost position relative to the left and right lower rails 3, the front end of the ottoman 71 of the first seat body 5 may be disposed forward of the front end of the rear wire harness supplying device 91. This makes it difficult for a user seated on the first seat body 5 to step on the wire harness supplying device 91.

[0081] When the first seat body 5 is positioned at the rearmost position relative to the left and right lower rails 3, the front end of the seat cushion 15 of the first seat body 5 may be disposed rearward of the front end of the rear wire harness supplying device 91. In another embodiment, when the first seat body 5 is positioned at the rearmost position relative to the left and right lower rails 3, the front end of the seat cushion 15 of the first seat body 5 may be disposed forward of the front end of the rear wire harness supplying device 91. This allows the seat cushion 15 to be made larger.

[0082] When the second seat body 9 is positioned most forward relative to the left and right lower rails 3, the front end of the second seat body 9 may be disposed rearward of the front end of the front wire harness supplying device 91. In other embodiments, when the second seat body 9 is positioned most forward relative to the left and right lower rails 3, the front end of the second seat body 9 may be disposed forward of the front end of the front wire harness supplying device 91.

[0083] When the second seat body 9 is positioned most forward relative to the left and right lower rails 3, the rear end of the second seat body 9 may be disposed forward of the rear end of the front wire harness supplying device 91. In other embodiments, when the second seat body 9 is positioned most forward relative to the left and right lower rails 3, the rear end of the second seat body 9 may be disposed rearward of the rear end of the front wire harness supplying device 91.

[0084] The manufacturing method of the vehicle seat 1 includes a step of attaching left and right lower rails 3, which respectively support left and right first upper rails 4 so that they are slidable, to a floor 2, and a step of attaching the seat body to the left and right first upper rails 4.

[0085] Although the description of the specific embodiment has been completed above, the present invention is not limited to the above embodiment and can be modified in a wide range of ways. In other embodiments, the first seatback side member 41A and the second seatback side member 41B may be provided in the reversed left and right directions. [Explanation of symbols]

[0086] 1: Vehicle seats 2: Floor 3: Lower rail 4: First upper rail 5: First seat body 15: Seat cushion 16: Seat back 21: Seat cushion frame 25: Seat cushion side member 25A: First seat cushion side member 25B: Second seat cushion side member 26: Former member 31: Seat back frame 41: Seat back side member 41A: First seat back side member 41B: Second seat back side member 61: Seat belt 62: Belt guide 71: Ottoman 81: Side wall 82: Table 83: Storage recess 91: Wire harness supply device

Claims

1. A vehicle seat, The left and right lower rails are installed on the floor and extend forward and backward. left and right upper rails supported slidably on the lower rails, respectively; a seat body supported by each of the upper rails, The seat body includes a seat cushion that supports the buttocks of a user, and a seat back that extends upward from the seat cushion and supports the back of the user, The seat back has a seat back frame forming a skeleton, The seat back frame has left and right seat back side members extending vertically, one of the left and right seatback side members is a first seatback side member having a closed cross-sectional structure formed by a plurality of metal plates welded to each other, When viewed from above, the first seatback side member is disposed between one right edge and one left edge of the lower rail.

2. The seat cushion has a seat cushion frame that forms a skeleton, The seat cushion frame has left and right seat cushion side members extending in the front-rear direction, one of the left and right seat cushion side members is a first seat cushion side member pivotally connected at a rear end to the first seatback side member, 2. The vehicle seat according to claim 1, wherein the first seat cushion side members are disposed along outer edges of the corresponding lower rails in the left-right direction when viewed from above.

3. A belt guide through which a seat belt passes is provided at an upper end of the first seatback side member, 2. The vehicle seat according to claim 1, wherein at least a portion of the belt guide is disposed between one right edge and one left edge of the lower rail when viewed from above.

4. 4. The vehicle seat according to claim 3, wherein the first seatback side member is provided with a belt retractor for winding up the seat belt.

5. the seat cushion frame includes a front member extending in the left and right direction and connected to front portions of the left and right seat cushion side members, The front member is formed in a plate shape with its surface facing up and down, 3. The vehicle seat according to claim 2, wherein left and right side edges of the front member overlap with the left and right lower rails when viewed from above.

6. A plate-shaped ottoman is rotatably supported on the seat cushion frame, 3. The vehicle seat according to claim 2, wherein the left and right side edges of the ottoman are disposed between a left edge of the left lower rail and a right edge of the right lower rail when viewed from above.

7. the left and right seat cushion side members each include a second seat cushion side member different from the first seat cushion side member, The second seat cushion side member is provided with a side wall portion extending upward and having a surface facing left and right, A table is rotatably supported on the side wall portion, The side wall portion is provided with a storage recess for storing the table, 3. The vehicle seat according to claim 2, wherein, when viewed from above, the side wall portion is disposed more inward in the left-right direction than the outer edge in the left-right direction of the lower rail corresponding to the second seat cushion side member.

8. The vehicle seat according to claim 7 , wherein, when viewed from above, the side wall portion is disposed along the outer edge in the left-right direction of the lower rail that corresponds to the second seat cushion side member in the left-right direction.

9. a wire harness supplying device that receives a wire harness connected to a power source and is provided at an end of the lower rail that corresponds to the first seatback side member in the left-right direction; The vehicle seat according to claim 1 , wherein the wire harness extends from the wire harness supplying device through the lower rail to the upper rail.

10. A method for manufacturing a vehicle seat, comprising: a step of attaching left and right lower rails to a floor, the left and right upper rails being supported so as to be slidable thereon; and attaching a seat body to the left and right upper rails. The seat body includes a seat cushion that supports the buttocks of a user, and a seat back that extends upward from the seat cushion and supports the back of the user, The seat back has a seat back frame forming a skeleton, The seat back frame has left and right seat back side members extending vertically, one of the left and right seatback side members is a first seatback side member having a closed cross-sectional structure formed by a plurality of steel plates welded to each other, A method for manufacturing a vehicle seat, wherein the first seatback side member is disposed between one right edge and one left edge of the lower rail when viewed from above.

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