JP2021107178A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat which can contribute to reduction of a workload for assembly of a seat back frame.SOLUTION: A seat back frame includes: left and right side frames 35 each having a plate-like part 35a which extends upward along a vertical surface orthogonal to a rotation axis SX, a front wall 35b which is continuous with a front edge of the plate-like part 35a and is formed bent inward, and a rear wall 35c which is continuous with a rear end of the plate-like part 35a and is formed bent inward; a lower frame 36 having a back area 51 which is disposed rearward of the rotation axis SX and is joined to the rear wall 35c from the rear side to connect the left and right side frames 35; and an upper frame for connecting the left and right side frames 35 with each other above the lower frame 36. The lower frame 36 has a reinforcement area 52 which is continuous with a lower end of the back area 51, expands to an area at the front side relative to the rotation axis SX, and is joined to the front wall 35b from the rear side.SELECTED DRAWING: Figure 4

Description

The present invention is formed by a plate-shaped portion that extends along a vertical plane orthogonal to the rotation axis around the rotation axis and extends upward along the vertical plane, and a plate-shaped portion that is continuously bent inward from the trailing edge of the plate-shaped portion. , Left and right side frames with rear walls that form a curved area extending vertically from around the axis of rotation, and dorsal areas that are located behind the axis of rotation and are joined to the rear wall from behind to connect the left and right side frames to each other. The present invention relates to a vehicle seat including a lower frame having a lower frame and a seat back frame having an upper frame for connecting left and right side frames to each other above the lower frame.

Patent Document 1 discloses a vehicle seat (vehicle seat) including a seat back that is recliningly connected to a seat cushion. The seat back extends vertically upward from the rotation axis, and the left and right side frames that support the seat back pad and the lower panel (lower frame) that is arranged behind the reclining rotation axis and connects the left and right side frames to each other. And an upper cross member (upper frame) that connects the left and right side frames to each other above the lower panel. The left and right side frames, lower panel and upper cross member form a square frame structure.

Japanese Unexamined Patent Publication No. 2013-67240

The individual side frames have a plate-shaped part that extends along the vertical plane orthogonal to the reclining rotation axis, and an upper cloth that is continuously bent inward from the trailing edge of the plate-like part and extends vertically from around the rotation axis. It has a trailing wall that forms a curved area leading to the member. When assembling the seat back frame, the lower panel is joined to the rear wall of the side frame from the rear. Therefore, the side frame can be attached to the lower panel from one direction. The side frame can be attached to the lower panel with good work efficiency.

On the other hand, since the space between the two joint regions is flat, the torsional rigidity of the frame structure is not so high. High joint strength is required for joining the lower panel and side frame to ensure torsional rigidity. The workload of joining increases.

An object of the present invention is to provide a vehicle seat that can contribute to reducing the workload when assembling the seat back frame.

According to the first aspect of the present invention, a plate-shaped portion extending along a vertical plane orthogonal to the rotation axis around the rotation axis and extending upward along the vertical plane, continuous from the front edge of the plate-shaped portion. The front wall, which is bent inward to form a curved region extending vertically from around the rotation axis, and the plate-shaped portion, which is continuously bent inward from the trailing edge of the plate-shaped portion, is bent inward in the vertical direction from around the rotation axis. Left and right side frames having a rear wall forming a curved region extending to, and a lower frame having a back region arranged behind the rotation axis and joined to the rear wall from the rear to connect the left and right side frames to each other. In a vehicle seat including a seat back frame having an upper frame that connects the left and right side frames to each other above the lower frame, the lower frame continuously rotates from the lower edge of the back region. It has a reinforcing area that extends forward from the axis and is joined to the front wall from the rear.

According to the second side surface, in addition to the configuration of the first side surface, the side frame provides a space formed between the front wall and the rear wall along the peripheral edge of the plate-like portion around the rotation axis. Have.

According to the third side surface, in addition to the configuration of the first or second side surface, the vehicle seats are individually attached to the side frame and rotatably around the rotation axis to the seat cushion frame. A reclining mechanism for connecting the seat back frames and a connecting member for connecting the left and right link lining mechanisms are further provided, and an opening is formed in the back region of the lower frame to allow the passage of a jig when the seat back frame is assembled. The connecting member is formed with a square body arranged in front of the opening and held by the jig.

According to the fourth side surface, in addition to the configuration of the first to third side surfaces, a first receiving surface that extends in the first plane and is supported from the rear is formed in the back region of the lower frame. The rear wall of the side frame spreads in the second plane set in a positional relationship determined with respect to the first plane, and when supported from the rear, the side frame is attached to the lower frame. A second receiving surface for positioning is formed.

According to the fifth side surface, in addition to the configuration of any one of the first to third side surfaces, the upper frame is formed by bending from a plate material and is separated from a front wall separated by an upper ridge line and a lower ridge line extending in the horizontal direction. An upper wall that continuously extends rearward from the upper ridge line, an upper standing wall that is bent upward from the rear end of the upper wall and is joined to the rear wall from the front, and an upper wall that continuously extends rearward from the lower ridge line. It has a lower wall and a lower standing wall that is bent downward from the rear end of the lower wall and joined to the rear wall from the front, and the inner edge of the front wall is a virtual shape corresponding to the shape of the upper frame. It has a projecting piece that extends inward from the contour line and overlaps the front wall from the rear.

According to the sixth side surface, in addition to the configuration of the fifth side surface, the front wall is formed by bending forward at two positions on the left and right in the horizontal direction to form a depression along the valley fold line in the vertical direction. It has a connecting piece extending toward, and the recess is formed with a reinforcing shape that extends and reinforces rigidity in the bending direction while intersecting the valley fold line.

According to the seventh side surface, in addition to the configuration of the fifth or sixth side surface, the upper wall and the lower wall are formed with coaxial through holes for holding the headrest pillars, and the front wall is viewed from the front. A reinforcing shape is formed that reinforces the rigidity in the extending in-plane direction while intersecting the headrest pillar.

According to the eighth side surface, in addition to the configuration of the fifth or sixth side surface, the upper wall and the lower wall are formed with coaxial through holes for holding the headrest pillars, and the upper wall is formed with the upper wall. A flange that is continuously bent forward from the upper end of the standing wall is formed, and behind the through hole, the flange is formed with a receiving piece that is continuously bent upward or downward from the front edge of the flange. NS.

According to the ninth side surface, in addition to the configuration of the eighth side surface, a support cylinder inserted into the through hole and supporting the headrest pillar guide for guiding the headrest pillar is fixed to the upper wall and the lower wall. The receiving piece supports the support cylinder from the rear.

According to the tenth side surface, a first receiving surface that extends in a first plane and is supported from the rear is formed in the back region of the lower frame, and the first receiving surface is formed on the rear wall of the side frame. A second receiving surface that spreads within the second plane set in a positional relationship determined with respect to the plane and positions the side frame with respect to the lower frame when supported from the rear is formed, and the upper The frame has a third receiver that spreads in a third plane set in a positional relationship determined with respect to the second plane and positions the upper frame with respect to the side frame when supported from behind. A plane is formed.

According to the first aspect, the lower frame is joined to the individual side frames in addition to the back area by a reinforcing area extending from the lower edge of the back area toward the front of the rotation axis. Torsional rigidity can be increased. The bonding strength of the lower frame and the side frame can be reduced as compared with the case where the lower frame is bonded to the side frame only in the back region. In this way, the workload of joining can be reduced. Moreover, when assembling the seat back frame, the lower frame can be assembled to the side frame from the rear. The side frame can be attached to the lower frame from one direction. Assembling workability is not impaired.

According to the second side surface, the front wall that is bent and molded along the peripheral edge of the plate-shaped portion around the rotation axis and the rear wall that is bent and molded along the peripheral edge of the plate-shaped portion around the rotation axis are separated in space. Therefore, in drawing the side frame, the shape accuracy of the front wall and the rear wall can be improved as compared with the case where the front wall and the rear wall are continuous around the rotation axis. Therefore, the assembling property of the side frame with respect to the lower frame is stable.

According to the third aspect, the jig can be inserted into the opening from the rear when assembling the seat back frame. The jig can hold the square body of the connecting member. In this way, the connecting member can be positioned with respect to the left and right rotating bodies. The connecting members can be joined to the individual rotating bodies with good working efficiency.

According to the fourth aspect, the lower frame can be physically supported by the first receiving surface when assembling the seat back frame. When the side frame is physically supported by the second receiving surface, the side frame can be positioned with respect to the lower frame based on the positional relationship between the first plane and the second plane. The side frame can be easily positioned with respect to the lower frame.

According to the fifth side surface, the upper frame can be assembled from the front to the left and right side frames arranged at intervals during assembly. At this time, the front wall of the side frame does not interfere with the upper and lower standing walls located behind the front wall in the upper frame. In this way, work efficiency can be improved when assembling the upper frame.

According to the sixth side surface, the rigidity of the front wall can be increased against bending along the valley fold line. Therefore, deformation of the upper frame can be suppressed when assembling the upper frame. The work efficiency of assembly can be improved.

According to the seventh side surface, the rigidity of the front wall can be increased corresponding to the through holes of the upper wall and the lower wall. Therefore, deformation of the upper frame can be suppressed when assembling the upper frame. The work efficiency of assembly can be improved.

According to the eighth side surface, the rigidity of the front wall can be increased corresponding to the through holes of the upper wall and the lower wall. Therefore, deformation of the upper frame can be suppressed when assembling the upper frame. The work efficiency of assembly can be improved.

According to the ninth side surface, the rigidity of the front wall can be increased by the cooperation of the support cylinder and the receiving piece. Therefore, deformation of the upper frame can be suppressed when assembling the upper frame. The work efficiency of assembly can be improved.

According to the tenth aspect, the lower frame can be physically supported by the first receiving surface in assembling the seat back frame. When the side frame is physically supported by the second receiving surface, the side frame can be positioned with respect to the lower frame based on the positional relationship between the first plane and the second plane. The side frame can be easily positioned with respect to the lower frame. When the upper frame is physically supported by the third receiving surface, the upper frame can be positioned on the side frame based on the positional relationship between the second plane and the third plane. The upper frame can be easily positioned with respect to the side frame.

It is a perspective view which shows typically the whole structure of the vehicle seat which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of a seat frame schematicly. It is a perspective view which shows the structure of the seat cushion pad and the seat back pad schematicly. It is a front view of the lower frame. It is a rear view of the lower frame. It is an enlarged cross-sectional view along the line 6-6 of FIG. It is a bottom view of the enlarged part of a seat back frame. It is a front view of the upper frame. It is the enlarged front view of the side frame. FIG. 5 is a cross-sectional view taken along the line 10-10 of FIG. It is an enlarged perspective view of the upper wall of the upper frame. It is sectional drawing of the lower frame cut by the cut surface passing through the central axis of the insertion hole. It is sectional drawing of the side frame which was overlapped with the lower frame and was cut at the cut surface passing through the central axis of the insertion hole. It is sectional drawing of the upper frame which was overlapped with the side frame and was cut at the cut surface passing through the central axis of the insertion hole. It is sectional drawing of the lower frame and connecting shaft cut by the cut plane passing through the central axis of an opening. It is a front view of the upper frame which concerns on a modification. It is sectional drawing of the lower frame and the connecting shaft cut by the cut plane passing through the central axis of the opening, and is the figure which shows the connecting shaft which concerns on other specific examples. It is a front view which shows typically the support cylinder to be inserted into the upper wall and the lower wall of an upper frame. FIG. 5 is a cross-sectional view taken along the line 19-19 of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, front / rear, left / right, and up / down refer to the directions seen from the occupant seated in the vehicle seat in the normal sitting posture (basic posture during driving).

FIG. 1 schematically shows an overall configuration of a vehicle seat (vehicle seat) according to an embodiment of the present invention. The vehicle seat 11 is supported by, for example, a slide rail 13 coupled to a floor panel 12 that functions as one component of a vehicle's monocock structure, and a slide rail 13 that can be moved in the front-rear direction, and holds the occupant's buttocks and thighs. The seat cushion 14 that receives the seat cushion 14 is connected to the seat cushion 14 so that it can swing in the front-rear direction around the swing axis SX, and is supported by the seat back 15 that receives the back of the occupant and the upper end of the seat back 15, and the head of the occupant. A headrest 16 for receiving the headrest 16 is provided. The seat cushion 14, the seat back 15, and the headrest 16 each have skin materials 14a, 15a, 16a that individually wrap the inner pad. The skin materials 15a and 16a are brought into close contact with the outer surface of the pad following the recesses of the pad by the action of the hanging thread 17. Details of the pad will be described later. The vehicle seat 11 is configured for the left seat. When the vehicle seat 11 is used for the right seat, the left and right sides of the vehicle seat 11 may be exchanged.

The seat cushion 14 includes a side cover 18. A first lever (operator) 19a and a second lever (operator) 19b are attached to the side cover 18. The first lever 19a is swingably supported around an axis parallel to the rotation axis SX. When the first lever 19a is pulled upward around the axis, the seat cushion 14 and the seat back 15 move upward. When the first lever 19a is pushed downward around the axis, the seat cushion 14 and the seat back 15 move downward. The second lever 19b is swingably supported around the rotation axis SX. When the second lever 19b is pulled upward around the swing axis SX, the lock is released between the seat cushion 14 and the seat back 15 around the swing axis SX. The swing of the seat back 15 is allowed around the swing axis SX. The seat back 15 is driven forward around the swing axis SX by the action of the spring force. When an external force is applied to the seat back 15 rearward around the swing axis SX against the spring force, the seat back 15 can be driven rearward around the swing axis SX. When the second lever 19b is released from the pulling force around the swing axis SX, a lock is established between the seat cushion 14 and the seat back 15 around the swing axis SX. The angle of the seat back 15 can be fixed around the swing axis SX.

A third lever (operator) 19c is attached to the seat cushion 14. The third lever 19c is swingably supported around an axis parallel to the swing axis SX. When the third lever 19c is pulled upward around the axis, the lock is released between the seat cushion 14 and the slide rail 13. Linear movement of the seat cushion 14 on the slide rail 13 is allowed. When an external force is applied to the seat cushion 14 forward or backward, the seat cushion 14 can be displaced along the slide rail 13. When the third lever 19c is released from the pulling force around the axis, a lock is established between the seat cushion 14 and the slide rail 13. The position of the seat cushion 14 can be fixed in the front-rear direction on the slide rail 13.

The headrest 16 is fixed to the headrest pillar 21 extending upward from the upper end of the seat back 15. The headrest pillar 21 is supported by the seat back 15 so as to be vertically displaceable in the axial direction. The height of the headrest 16 can be adjusted according to the displacement of the headrest pillar 21.

As shown in FIG. 2, the vehicle seat 11 includes a seat frame 23 that supports the pads. The seat frame 23 is connected to the seat cushion frame 24 that supports the pad of the seat cushion 14 and the seat cushion frame 24 that swings around the swing axis SX to support the pad of the seat back 15. And a base frame 26 that is guided by the slide rail 13 so as to be movable back and forth in the longitudinal direction and supports the seat cushion frame 24 on the slide rail 13. The seat cushion frame 24 is connected to the base frame 26 by a link mechanism 27. The link mechanism 27 rotates around one end rotatably connected to the base frame 26 around the horizontal axis FH extending in the left-right direction parallel to the swing axis SX and around the horizontal axis SH extending in the left-right direction parallel to the horizontal axis FH. A link member 28 having an other end that is freely coupled to the seat cushion frame 24 is provided. The link member 28 guides the vertical movement of the seat cushion frame 24 with respect to the base frame 26 around the horizontal axis FH.

The seat cushion frame 24 includes a cushion side frame 24a extending side by side with each slide rail 13, a pan frame 24b connecting the cushion side frames 24a at the front end of the seat cushion 14, and a cushion side frame at the rear end of the seat cushion 14. It is provided with a connecting pipe 24c for connecting the 24a to each other. A plurality of S springs (not shown) are arranged between the pan frame 24b and the connecting pipe 24c. The individual S springs have a zigzag shape and extend back and forth. The zigzag shape is formed by alternately combining a wire rod extending in the front-rear direction and a wire rod extending in the left-right direction.

A manual type forward / backward movement device 29 is attached to the base frame 26. The third lever 19c is connected to the manual type forward / backward moving device 29. The manual type forward / backward movement device 29 switches between locking and unlocking the movement of the base frame 26 on the slide rail 13 in response to the swing of the third lever 19c.

A manual vertical movement device 31 is attached to the cushion side frame 24a of the seat cushion frame 24. The manual vertical movement device 31 includes a transmission mechanism 32 supported by the cushion side frame 24a and connected to the link mechanism 27. The transmission mechanism 32 is arranged outside the cushion side frame 24a and causes the link member 28 to rotate with respect to the cushion side frame 24a around the horizontal axis SH in response to the driving force transmitted from the first lever 19a around the axis. .. The transmission mechanism 32 may include, for example, a drive gear fixed to the swing shaft of the first lever 19a and a driven gear fixed to the link member 28 around the horizontal axis SH.

The seat back frame 25 is a lower frame that connects the left and right side frames 35 that are connected to the inside of each cushion side frame 24a by the reclining unit (reclining mechanism) 34 and the lower ends of the side frames 35 to each other around the reclining unit 34. 36 and an upper frame 37 that connects the upper ends of the side frames 34 to each other above the lower frame 36 are provided. The side frame 35 extends around the reclining unit 34 along the vertical plane orthogonal to the swing axis SX, extends upward along the vertical plane, and is continuously inside the plate-shaped portion 35a from the front edge of the plate-shaped portion 35a. The front wall 35b, which is bent in the direction and forms a curved region 38 extending in the vertical direction from around the reclining unit 34, and the plate-shaped portion 35a are continuously bent inward from the trailing edge, and are vertically bent from around the reclining unit 34. It has a rear wall 35c that forms a curved region 39 extending into. The rear wall 35c is formed with a side frame flange 41 that is continuously bent forward from the inner end of the rear wall 35c. Each side frame 35 is formed from, for example, one metal plate. A headrest pillar guide 42 that supports the headrest pillar 21 so as to be slidable in the vertical direction is fixed to the upper frame 37. Details of the upper frame 37 will be described later.

The reclining unit 34 includes a rotating body 43 that is rotatably supported relative to the seat cushion frame 24 and the seat back frame 25. A shaft body 44 is coaxially coupled to one of the rotating bodies (here, the left rotating body) 43 with the swing axis SX. The second lever 19b is fixed to the shaft body 44. The relative rotation of the seat cushion frame 24 and the seat back frame 25 is locked and unlocked according to the rotation of the rotating body 43. The left and right reclining units 34 are connected to each other by a connecting shaft 45. The connecting shaft 45 can rotate around the swing axis SX. The connecting shaft 45 transmits the rotation of one rotating body (here, the left rotating body) 43 to the other rotating body (here, the right rotating body) 43. In this way, the operation of the second lever 19b is transmitted from one reclining unit 34 to the other reclining unit 34.

As shown in FIG. 3, the seat cushion 14 further includes a seat cushion pad 46 supported by the seat cushion frame 24 and wrapped in the skin material 14a. The seat back 15 further includes a seat back pad 47 supported by the seat back frame 25 and wrapped in the skin material 15a. The seat cushion pad 46 and the seat back pad 47 are formed of an elastic material such as urethane foam.

As shown in FIGS. 4 to 6, the lower frame 36 is arranged behind the swing axis SX and is joined to the rear wall 35c of the side frame 35 from the rear to connect the left and right side frames 35 to each other. It has a 51 and a reinforcing region 52 that continuously extends from the lower edge of the back region 51 toward the front of the swing axis SX and is joined to the front wall 35b from the rear. The reinforcing region 52 has a generatrix in a posture orthogonal to the plate-shaped portion 35a of the side frame 35, and is curved around the swing axis SX along the edge of the plate-shaped portion 35a. The torsional rigidity of the lower frame 36 can be increased around the swing axis SX by the action of the curved reinforcing region 52. The lower frame 36 is formed from, for example, one metal plate.

The back region 51 has a flat plate portion 51a extending along the first plane Pf, and a flange 51b that is continuously bent forward from the upper edge of the flat plate portion 51a. The upper edge of the flat plate portion 51a includes a first edge 53a extending parallel to the swing axis SX in the left-right direction from the left-right center position, and a second edge 53b extending upwardly from the left-right ends of the first edge 53a. It includes a third edge 53c that extends from the upper end of the second edge 53b outward in parallel with the swing axis SX and is overlapped with the side frame 35. The flange 51b is continuous at the first edge 53a and the second edge 53b and faces the side frame flange 41 which is interrupted at the upper end of the second edge 53b.

Weld marks 54 for welding are established in the back region 51 at positions overlapping the left and right side frames 35. Here, the weld mark 54 is composed of a weld bead formed along the edge of the side frame 35. The left and right side frames 35 are joined to the back region 51 of the lower frame 36 at the welding marks 54. In addition, spot welding and laser welding can be used for welding.

Two insertion holes 55 are formed in the back region 51 at positions separated from the individual side frames 35. The insertion hole 55 is arranged apart in the axial direction of the swing axis SX at a distance that the lower frame 36 is stably supported when the lower frame 36 is supported by a pin that stands up in the vertical direction (gravity direction). .. The insertion hole 55 has, for example, a circular contour.

Two openings 56 are formed in the back region 51 in the left-right direction toward the center of the two insertion holes 55 at positions separated from the individual side frames 35. The openings 56 are arranged apart from each other in the axial direction of the swing axis SX at a distance in which the connecting shaft 45 is stably supported when the connecting shaft 45 is supported by a jig standing in the vertical direction (gravity direction). The opening 56 has, for example, a circular contour.

As shown in FIG. 5, the back region 51 is formed with a first receiving surface 57 that extends within the first plane Pf and is supported from the rear when the seat back frame 25 is assembled. The insertion hole 55 and the opening 56 are drilled in the first receiving surface 57. Here, the opening 56 may be partially widened in the reinforcing area 52. The connecting shaft 45 is formed with a square body 58 arranged in front of the opening 56 and held by a jig as described later. The square body 58 is arranged in a cylindrical space surrounded by a virtual cylindrical surface inscribed in the opening 56 while being orthogonal to the first plane Pf. The square body 58 can be formed into a square cross-sectional shape, for example, by crushing a round tube flat.

As shown in FIG. 7, the front wall 35b of the side frame 35 has a first height Hf from the plate-shaped portion 35a in the axial direction of the swing axis SX. The front wall 35b is arranged so as to be offset in the axial direction of the swing axis SX from the virtual plane Se orthogonal to the swing axis SX including the edge of the lower frame 36. The rear wall 35c of the side frame 35 is adjacent to the front wall 35b along the peripheral edge of the plate-shaped portion 35a around the swing axis SX with a space 59 in between, and is located in the axial direction of the swing axis SX from the plate-shaped portion 35a. A low wall 61a having a height Hf and a high wall portion continuous from the low wall portion 61a and having a second height Hs larger than the first height Hf in the axial direction of the swing axis SX from the plate-shaped portion 35a. It has 61b and. The curved area 38 of the front wall 35b and the curved area 39 of the rear wall 35c are separated by a space 59. As shown in FIG. 4, the high wall portion 61b is arranged above the virtual plane Le which is orthogonal to the first plane Pf and is in contact with the front edge of the reinforcing region 52 from above.

As shown in FIG. 7, on the front wall 35b of the side frame 35, a stacking piece 62 that extends inward from the inner edge of the first height Hf and is overlapped with the reinforcing region 52 of the lower frame 36 from the front is formed. .. A welding mark 63 for welding is established on the edge of the overlapping piece 62 at a position overlapping the reinforcing area 52. Here, the weld mark 63 is composed of a weld bead formed along the edge of the stack 62. The left and right side frames 35 are joined to the reinforcing area 52 of the lower frame 36 at the welding marks 63. In addition, spot welding and laser welding can be used for welding. As shown in FIG. 4, the overlapping piece 63 is arranged below the virtual plane Le which is orthogonal to the first plane Pf and is in contact with the front edge of the reinforcing region 52 from above.

As shown in FIG. 5, each side frame 35 spreads in the second plane Ps set in a positional relationship determined with respect to the first plane Pf, and is supported from the rear when the seat back frame 25 is assembled. The second receiving surface 64 to be formed is formed. Here, the second plane Ps is set parallel to the first plane Pf. The rear wall 35c of the side frame 35 is formed with an insertion hole 65 that opens into the second receiving surface 64 at a position separated from the lower frame 36. The insertion hole 65 has, for example, a circular contour.

As shown in FIG. 2, an auxiliary insertion hole 66 is formed in the rear wall 35c of each side frame 35 at a position above the insertion hole 65 and away from the upper frame 37. The auxiliary insertion hole 66 is a distance in which the side frame 35 is stably supported in cooperation with the insertion hole 65 when the side frame 35 is supported by a pin that stands up in the vertical direction (gravity direction) like the insertion hole 65. Is arranged vertically away from the insertion hole 65. The auxiliary insertion hole 66 has, for example, a circular contour. The auxiliary insertion hole 66 expands in the auxiliary plane set in a positional relationship determined with respect to the first plane Pf, and opens at the auxiliary receiving surface supported from the rear when the seat back frame 25 is assembled.

As shown in FIG. 8, the upper frame 37 is formed by bending from a plate material, and has a front wall 69 separated by an upper ridge line 67 and a lower ridge line 68 extending in the horizontal direction, and an upper wall extending rearward continuously from the upper ridge line 67. 71, an upper wall 72 that is bent upward from the rear end of the upper wall 71, a lower wall 73 that is continuous and extends rearward from the lower ridge line 68, and a lower wall that is bent downward from the rear end of the lower wall 73. It has a standing wall 74. A first flange 75 that is continuously bent forward from the upper end of the upper wall 72 is connected to the upper wall 72. The first flange 75 extends horizontally over the entire area along the upper edge of the upper wall 72. A second flange 76 that is continuously bent forward from the lower end of the lower standing wall 74 is connected to the lower standing wall 74. The second flange 76 extends horizontally over the entire area along the lower edge of the lower wall 74.

The front wall 69 has a connecting piece 69a that is formed by bending forward at two positions on the left and right in the horizontal direction to form a recess along the valley fold line 77 in the vertical direction, and each extends outward. The connecting piece 69a is further bent and formed rearward on the outside of the recess in the horizontal direction to form a ridge line along the mountain fold line 78 in the vertical direction. As the front wall 69 is deformed, the upper standing wall 72 and the lower standing wall 74 are similarly deformed. The upper frame 37 is formed from, for example, one metal plate.

Weld marks 79 are established on the front wall 69 outside the mountain fold line 78 in the horizontal direction. Here, the weld mark 79 is composed of weld beads formed along the edges of the left and right side frames 35. Welding marks 81 and 82 of welding are established on the upper standing wall 72 and the lower standing wall 74 corresponding to the upper and lower sides of the welding mark 79. Here, the welding marks 81 and 82 are composed of welding beads formed along the edges of the left and right side frames 35. The upper frame 37 is fixed to the left and right side frames 35 at the welding marks 79, 81, and 82. In addition, spot welding and laser welding can be used for welding.

As shown in FIG. 9, the inner edge of the front wall 35b has a protrusion 83 that extends inward from the virtual contour line 83a corresponding to the edge of the upper frame 37 and overlaps the front wall 69 of the upper frame 37 from the rear. The front wall 69 of the upper frame 37 forms a weld mark 79 with the projecting piece 83. The inner edge of the rear wall 35c is an upper stacking area 84 that is overlapped with the upper wall 72 of the upper frame 37 from the rear, and a space below the upper stacking area 84 from the upper stacking area 84, and the upper frame 37 from the rear. It has a lower stacking area 85 that is superposed on the lower wall 74. The upper wall 72 of the upper frame 37 forms a welding mark 81 with the upper overlapping region 84. Similarly, the lower wall 74 of the upper frame 37 forms a weld mark 82 with the lower overlapping region 85.

As shown in FIG. 10, the upper frame 37 is formed in a first through hole 87 formed in the upper wall 71 to receive the headrest pillar guide 86, and a second through hole 87 formed in the lower wall 73 to receive the headrest pillar guide 86. It has a through hole 88. The headrest pillar guide 86 supports the headrest pillar 21 so as to be displaced in the axial direction. The headrest pillar guide 86 is formed with a positioning flange 89 that extends in a direction orthogonal to the axis. When the headrest pillar guide 86 is inserted into the first through hole 87 and the second through hole 88 from above, the positioning flange 89 contacts the upper wall 71 from above and positions the headrest pillar guide 86 in the axial direction. The headrest pillar guide 86 can be molded from, for example, a resin material.

Support hole flanges 91 that are bent downward are formed on the peripheral edges of the first through hole 87 and the second through hole 88, respectively. The headrest pillar guide 86 is press-fitted into the support hole flange 91. The support hole flange 91 fixes the headrest pillar guide 86 to the upper frame 37. The support hole flange 91 can prevent the headrest pillar guide 86 from coming off from the upper frame 37.

As shown in FIG. 11, behind the first through hole 87, the first flange 75 is formed with a receiving piece 92 that is bent downward from the front edge of the first flange 75. The receiving piece 92 receives the headrest pillar guide 86 from the rear. The load acting on the headrest pillar guide 86 from the front is supported by the upper wall 72 of the upper frame 37. In addition, the receiving piece 92 may be bent upward from the front edge of the first flange 75.

As shown in FIG. 8, a bead (reinforcing shape) 93 is formed in the recess of the front wall 69 to reinforce the rigidity of the front wall 69 in the extending bending direction while intersecting the valley fold line 77. The bead 93 extends horizontally in the left-right direction. Similarly, the front wall 69 is formed with a bead (reinforced shape) 94 that reinforces the rigidity of the front wall 69 in the inward extending direction while intersecting the headrest pillar 21 in the front view. The bead 94 is inclined so as to be displaced upward from the lowermost end toward the center toward the outside.

Two insertion holes 95 are formed in the front wall 69 in a region sandwiched between the two recesses. The insertion hole 95 is arranged apart in the axial direction of the swing axis SX at a distance that the upper frame 37 is stably supported when the upper frame 37 is supported by a pin that stands up in the vertical direction (gravity direction). .. The insertion hole 95 has, for example, a circular contour. As shown in FIG. 10, the insertion hole 95 expands in the third plane Pt set in the positional relationship determined with respect to the first plane Pf (or the auxiliary plane), and when the seat back frame 25 is assembled. It opens at the third receiving surface 96 supported from the rear.

Next, a method of manufacturing the seat back frame 25 will be described. A lower frame 36, left and right side frames 35, and an upper frame 37 are prepared for assembling the seat back frame 25. As shown in FIG. 12, the lower frame is installed on the first plane Pf. At the time of installation, the insertion pin 101 is inserted into the insertion hole 55. The insertion pin 101 is formed in a cylindrical shape having an axial center that stands up in the vertical direction (gravity direction), for example. The insertion pin 101 has a step 101a that defines a first plane Pf orthogonal to the axis. The first receiving surface 57 of the lower frame 36 is received by the step 101a of the insertion pin 101. The lower frame 36 is positioned with respect to the first plane Pf by inserting the insertion pin 101 into the insertion hole 55.

Subsequently, as shown in FIG. 13, the left and right side frames 35 are arranged on the lower frame 36. In the arrangement, the insertion pin 102 is inserted into the insertion hole 65 of the side frame 35. The insertion pin 102 is formed in a cylindrical shape having an axial center that stands up in the vertical direction (gravity direction), for example. The insertion pin 102 has a step 102a that defines a second plane Ps orthogonal to the axis. The second receiving surface 64 of the side frame 35 is received by the step 102a of the insertion pin 102. At this time, an auxiliary insertion pin (not shown) is further inserted into the auxiliary insertion hole 66 of the side frame 35. The auxiliary insertion pin is formed in a cylindrical shape having an axial center that stands up in the vertical direction (gravity direction), for example. The auxiliary insertion pin has a step that defines the auxiliary plane. The auxiliary receiving surface of the side frame 35 is received by the step of the auxiliary insertion pin. The side frame 35 is supported by the second plane Ps and the auxiliary plane. Since the second plane Ps and the auxiliary plane are arranged in a predetermined positional relationship with respect to the first plane Pf, the left and right side frames 35 can be accurately positioned with respect to the lower frame 36. The side frame 35 can be superposed on the lower frame 36 from the axial direction of the insertion pin 102. The rear wall 35c of the side frame 35 is superposed on the back region 51 of the lower frame 36. The front wall 35b of the side frame 35 is superposed on the reinforcing region 52 of the lower frame 36 from the axial direction of the insertion pin 102. The side frame 35 thus positioned is welded to the lower frame 36. Weld marks 54 and 63 are formed.

Subsequently, as shown in FIG. 14, the upper frame 37 is arranged on the left and right side frames 35. In the arrangement, the insertion pin 103 is inserted into the insertion hole 95 of the upper frame 35. The insertion pin 103 is formed in a cylindrical shape having an axial center that stands up in the vertical direction (gravity direction), for example. The insertion pin 103 has a step 103a that defines a third plane Pt orthogonal to the axis. The third receiving surface 96 of the upper frame 37 is received by the step 103a of the insertion pin 103. Since the third plane Pt is arranged in a predetermined positional relationship with respect to the first plane Pf and the auxiliary plane, the upper frame 37 can be accurately positioned with respect to the left and right side frames 35. The upper frame 37 can be superposed on the side frame 35 from the axial direction of the insertion pin 103. The front wall 69 of the upper frame 37 is superposed on the projecting piece 83 from the axial direction of the insertion pin 103. The upper wall 72 of the upper frame 37 is overlapped with the upper stacking area 84 of the rear wall 35c from the axial direction of the insertion pin 103. Interference between the upper wall 72 and the front wall 35b can be avoided in the superposition. Similarly, the lower wall 74 of the upper frame 37 is overlapped with the lower stacking area 85 of the rear wall 35c from the axial direction of the insertion pin 103. Interference between the lower wall 74 and the front wall 35b can be avoided during superposition. The upper frame 37 positioned in this way is welded to the left and right side frames 35. Weld marks 79, 81, 82 are formed.

As shown in FIG. 15, when the lower frame 36 is received by the insertion pin 101, the jig 104 enters the opening 56 of the back region 51. A square groove 104a is formed coaxially with the swing axis SX at the tip of the jig 104. The square body 58 of the connecting shaft 45 can be fitted into the square groove 104a. In this way, the connecting shaft 45 can be positioned with respect to the individual side frames 35. Both ends of the positioned connecting shaft 45 are welded to the rotating body 43 of the reclining unit 34, respectively.

In the seat back frame 25 according to the present embodiment, the lower frame 36 continuously extends forward from the swing axis SX from the lower edge of the back region 51 and is joined to the front wall 35b of the side frame 35 from the rear. It has a reinforcing area 52. In addition to the back region 51, the lower frame 36 is joined to each side frame 35 by a reinforcing region 52 extending from the lower edge of the back region 51 toward the front of the swing axis SX. The torsional rigidity of the seat back frame 25 can be increased. The bonding strength of the lower frame 36 and the side frame 35 can be reduced as compared with the case where the lower frame 36 is bonded to the side frame only in the back region 51. In this way, the workload of joining can be reduced. Moreover, when assembling the seat back frame 25, the lower frame 36 can be assembled to the side frame 35 from the rear. The side frame 35 can be attached to the lower frame 36 from one direction. Assembling workability is not impaired.

The side frame 35 has a space 59 formed around the reclining unit 34 along the periphery of the plate-shaped portion 35a between the front wall 35b and the rear wall 35c. The front wall 35b that is bent and molded along the peripheral edge of the plate-shaped portion 35a around the reclining unit 34 and the rear wall 35c that is bent and molded along the peripheral edge of the plate-shaped portion 35a around the reclining unit 34 are separated by a space 59. Will be done. In drawing the side frame 35, the shape accuracy of the front wall 35b and the rear wall 35c can be improved as compared with the case where the front wall 35b and the rear wall 35c are continuous around the reclining unit 34. Therefore, the assembling property of the side frame 35 with respect to the lower frame 36 is stable.

In the present embodiment, the back region 51 of the lower frame 36 is formed with an opening 56 that allows the jig 104 to pass through when the seat back frame 25 is assembled. On the other hand, the connecting shaft 45 is formed with a square body 58 arranged in front of the opening 56 and held by the jig 104. When assembling the seat back frame 25, the jig 104 can be inserted into the opening 56 from the rear. The jig 104 can hold the square body 58 of the connecting shaft 45. In this way, the connecting shaft 45 can be positioned with respect to the left and right rotating bodies 43. The connecting shaft 45 can be joined to each rotating body 43 with good work efficiency.

In the back region 51 of the lower frame 36, a first receiving surface 57 that extends within the first plane Pf and is supported from the rear is formed. The rear wall 35c of the side frame 35 spreads within the second plane Ps set in a positional relationship determined with respect to the first plane Pf, and when supported from behind, the side frame with respect to the lower frame 36. A second receiving surface 64 for positioning the 35 is formed. In assembling the seat back frame 25, the lower frame 36 can be physically supported by the first receiving surface 57. When the side frame 35 is physically supported by the second receiving surface 64, the left and right side frames 35 can be positioned with respect to the lower frame 36 based on the positional relationship between the first plane Pf and the second plane Ps. .. The side frame 35 can be easily positioned with respect to the lower frame 36.

In addition, the upper frame 37 spreads in the third plane Pt set in a positional relationship determined with respect to the second plane Ps, and when supported from the rear, the upper frame 37 is relative to the side frame 35. A third receiving surface 96 for positioning is formed. When the upper frame 37 is physically supported by the third receiving surface 96, the upper frame 37 can be positioned on the side frame 35 based on the positional relationship between the second plane Ps and the third plane Pt. The upper frame 37 can be easily positioned with respect to the side frame 35.

In the side frame 35 according to the present embodiment, on the inner edge of the front wall 35b, a projecting piece 83 that extends inward from the virtual contour line 83a corresponding to the shape of the upper frame 37 and is overlapped with the front wall 69 of the upper frame 37 from the rear. It is formed. The upper frame 37 can be assembled from the front to the left and right side frames 35 arranged at intervals during assembly. At this time, the front wall 35b of the side frame 35 does not interfere with the upper standing wall 72 and the lower standing wall 74 located behind the front wall 69 in the upper frame 37. In this way, the work efficiency can be improved when assembling the upper frame 37.

The front wall 69 of the upper frame 37 has a connecting piece 69a that is formed by bending forward at two positions on the left and right in the horizontal direction to form a recess along the valley fold line 77 in the vertical direction and extends toward the projecting piece 83. In the recess of the front wall 69, a bead 93 that extends while intersecting the valley fold line 77 and reinforces the rigidity in the bending direction is formed. The front wall 69 can be made more rigid with respect to bending along the valley fold line 77. Therefore, deformation of the upper frame 37 can be suppressed when the upper frame 37 is assembled. The work efficiency of assembly can be improved.

A bead 94 is formed on the front wall 69 of the upper frame 37 so as to extend inwardly to reinforce the rigidity while intersecting the headrest pillar 21 in the front view. In the upper frame 37, the rigidity of the front wall 69 can be increased corresponding to the first through hole 87 of the upper wall 71 and the second through hole 88 of the lower wall 73. Therefore, deformation of the upper frame 37 can be suppressed when the upper frame 37 is assembled. The work efficiency of assembly can be improved.

In the upper frame 37 according to the present embodiment, a receiving piece 92 that is continuously bent downward from the front edge of the first flange 75 is formed on the first flange 75 behind the first through hole 87. The rigidity of the front wall 69 can be increased corresponding to the first through hole 87 of the upper wall 71 and the second through hole 88 of the lower wall 73. Therefore, deformation of the upper frame 37 can be suppressed when the upper frame 37 is assembled. The work efficiency of assembly can be improved.

As shown in FIG. 16A, a punch opening 105 may be formed between the left and right beads 94 on the front wall 69 of the upper frame 37. The punched opening 105 can contribute to weight reduction of the upper frame 37. The bead 94 can suppress a decrease in rigidity caused by the formation of the punch opening 105. In addition, as shown in FIG. 16B, in the upper frame 37, in addition to the punched opening 105 of the front wall 69, a punched opening 106 may be formed in the lower standing wall 74. The punched opening 106 can contribute to further weight reduction of the upper frame 37. In addition, as shown in FIG. 16C, the lower wall 74 itself may be shortened in the vertical direction. In this case, the bead 93 may be extended toward the mountain fold line 78.

As shown in FIG. 17, the connecting shaft 45 itself may be formed of a square tube. In this case, the horn tube forms the horn body 58 in front of the opening 56.

As shown in FIG. 18, a support cylinder 107 inserted into the first through hole 87 and the second through hole 88 to support the headrest pillar guide 86 is fixed to the upper wall 71 and the lower wall 73 of the upper frame 36. NS. The support cylinder 107 is formed from, for example, a metal material. Here, small pieces 108 and 109 are bent upward and downward from the peripheral edge of the first through hole 87 and the second through hole 88, respectively. As shown in FIG. 19, the individual pieces 108, 109 are superposed on the outer surface of the support cylinder 107. The small pieces 108 and 109 are welded to the support cylinder 107. Since the welding can be performed from the front in the same manner as the welding of the upper frame 37 and the side frame 35, the work efficiency of assembling the seat frame 23 is improved. The headrest pillar guide 86 is press-fitted into the support cylinder 107.

The support cylinder 107 is supported by the receiving piece 92 from the rear. The rigidity of the front wall 69 can be increased by the cooperation of the support cylinder 107 and the receiving piece 92. Therefore, deformation of the upper frame 37 can be suppressed when the upper frame 37 is assembled. The work efficiency of assembly can be improved.

11 ... Vehicle seat (vehicle seat), 21 ... Headrest pillar, 24 ... Seat cushion frame, 25 ... Seat back frame, 34 ... Reclining mechanism (reclining unit), 35 ... Side frame, 35a ... Plate-shaped part, 35b ... Front wall, 35c ... Rear wall, 36 ... Lower frame, 37 ... Upper frame, 38 ... Curved area, 39 ... Curved area, 45 ... Connecting member (connecting shaft), 51 ... Back area, 52 ... Reinforcing area, 56 ... Opening , 57 ... 1st receiving surface, 58 ... square body, 59 ... space, 64 ... 2nd receiving surface, 67 ... upper ridge line, 68 ... lower ridge line, 69 ... front wall, 69a ... connecting piece, 71 ... upper wall, 72 ... upper wall, 73 ... lower wall, 74 ... lower wall, 75 ... flange (first flange), 77 ... valley fold line, 83 ... projecting piece, 83a ... virtual contour line, 86 ... headrest pillar guide, 87 ... Through hole (first through hole), 88 ... through hole (second through hole), 92 ... receiving piece, 93 ... reinforced shape (bead), 94 ... reinforced shape (bead), 96 ... third receiving surface, 104 ... Jig, 107 ... support cylinder, Pf ... first plane, Ps ... second plane, Pt ... third plane, SX ... rotation axis (swing axis).

Claims (10)

A plate-shaped portion (35a) that extends along a vertical plane orthogonal to the rotation axis (SX) around the rotation axis and extends upward along the vertical plane, and is continuously inside from the front edge of the plate-shaped portion (35a). It is bent inward continuously from the front wall (35b) forming a curved region (38) extending in the vertical direction from around the rotation axis and the trailing edge of the plate-shaped portion (35a). , Left and right side frames (35) having a rear wall (35b) forming a curved region (39) extending in the vertical direction from around the rotation axis.
A lower frame (36) having a back region (51) arranged behind the rotation axis (SX) and joined to the rear wall (35c) from the rear to connect the left and right side frames (35) to each other.
In a vehicle seat (11) including a seat back frame (25) having an upper frame (37) that connects the left and right side frames (35) to each other above the lower frame (36).
The lower frame (36) extends continuously from the lower edge of the back region (51) toward the front of the rotation axis (SX) and is joined to the front wall (35b) from the rear. ) Is a vehicle seat. In the vehicle seat according to claim 1, the side frame (35) is formed on the front wall (35b) and the rear wall (35c) along the peripheral edge of the plate-shaped portion (35a) around the rotation axis. A vehicle seat characterized by having a space (59) formed between them. In the vehicle seat according to claim 1 or 2.
A reclining mechanism (34) that is individually attached to the side frame (35) and rotatably connects the seat back frame (25) to the seat cushion frame (24) around the rotation axis (SX).
Further provided with a connecting member (45) for connecting the left and right link lining mechanisms (34).
The back region (51) of the lower frame (36) is formed with an opening (56) that allows the jig (104) to pass through when the seat back frame (25) is assembled.
A vehicle seat characterized in that a square body (58) arranged in front of the opening (56) and held by the jig (104) is formed on the connecting member (45). In the vehicle seat according to any one of claims 1 to 3, the back region (51) of the lower frame (36) extends in a first plane (Pf) and is supported from the rear. A receiving surface (57) is formed, and a second plane (Ps) is set on the rear wall (35c) of the side frame (35) in a positional relationship determined with respect to the first plane (Pf). ), A second receiving surface (64) for positioning the side frame (35) with respect to the lower frame (36) when supported from the rear is formed. .. In the vehicle seat according to any one of claims 1 to 3, the upper frame (37) is
A front wall (69) that is bent and molded from a plate material and is separated by an upper ridge line (67) and a lower ridge line (68) extending in the horizontal direction.
An upper wall (71) that extends rearward continuously from the upper ridge line (67),
An upper standing wall (72) that is bent upward from the rear end of the upper wall (71) and joined to the rear wall (35c) from the front.
A lower wall (73) that extends rearward continuously from the lower ridge line (68),
It has a lower standing wall (74) that is bent downward from the rear end of the lower wall (73) and is joined to the rear wall (35c) from the front.
The inner edge of the front wall (35b) has a protrusion (83) that extends inward from the virtual contour line (83a) corresponding to the shape of the upper frame (37) and is overlapped with the front wall (69) from the rear. A vehicle seat that features that. In the vehicle seat according to claim 5, the front wall (69) is horizontally bent and formed at two positions on the left and right to form a recess along a vertical valley fold line (77). It has a connecting piece (69a) extending toward the piece (83), and the recess is formed with a reinforcing shape (93) that extends and reinforces rigidity in the bending direction while intersecting the valley fold line (77). A vehicle seat that features that. In the vehicle seat according to claim 5 or 6, the upper wall (71) and the lower wall (73) are formed with coaxial through holes (87, 88) for holding the headrest pillars (21). A vehicle seat characterized in that a reinforced shape (94) is formed on the front wall (69) while intersecting the headrest pillar (21) in a front view and reinforcing the rigidity in the inward direction of the extending surface. In the vehicle seat according to claim 5 or 6, coaxial through holes (87, 88) for holding the headrest pillars (21) are formed in the upper wall (71) and the lower wall (73). The upper wall (72) is formed with a flange (75) that is continuously bent forward from the upper end of the upper wall (72), and the flange (75) is formed behind the through holes (87, 88). ) Is formed of a receiving piece (92) that is continuously bent upward or downward from the front edge of the flange (75). In the vehicle seat according to claim 8, the headrest is inserted into the through hole (88, 89) in the upper wall (71) and the lower wall (73) to guide the headrest pillar (21). A vehicle seat characterized in that a support cylinder (107) for supporting a pillar guide (86) is fixed, and the receiving piece (92) supports the support cylinder (107) from behind. In the vehicle seat according to any one of claims 5 to 9.
In the back region (51) of the lower frame (36), a first receiving surface (57) that extends in the first plane (Pf) and is supported from the rear is formed.
The rear wall (35c) of the side frame (35) spreads in the second plane (Ps) set in a positional relationship determined with respect to the first plane (Pf) and is supported from the rear. A second receiving surface (64) for positioning the side frame (35) with respect to the lower frame (36) is formed at the time of the operation.
The upper frame (37) spreads in a third plane (Pt) set in a positional relationship determined with respect to the second plane (Ps), and when supported from behind, the side frame (37) A vehicle seat characterized in that a third receiving surface (96) for positioning the upper frame (37) with respect to 35) is formed.

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