JP2023102304A - Vehicle seat and method of manufacturing vehicle seat - Google Patents

Abstract

To provide a vehicle seat in which assembly work can be streamlined.SOLUTION: The vehicle seat includes a first frame member (cushion-side frame) 11, a second frame member (connection bracket) 60 facing at least a part of the first frame member 11, and a fastening member (screw) 70 which is driven into a part where the first frame member 11 and the second frame member 60 face each other and fastens the first frame member 11 and the second frame member 60. The first frame member 11 has a first protuberant portion which is formed on a peripheral edge portion of the portion of the first frame member 11 to which the fastening member 70 is fastened and protrudes along the fastening direction of the screw 70. The second frame member 60 has a second protuberant portion 60f which is formed on a peripheral portion of the portion of the second frame member to which the fastening member 70 is fastened and protrudes along the fastening direction of the fastening member 70.SELECTED DRAWING: Figure 7

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat, and more particularly to a vehicle seat provided with a connecting bracket for connecting a cushion frame and a back frame, and a method of manufacturing the vehicle seat.

Conventionally, a vehicle seat is known in which a cushion frame and a back frame are connected by a connection bracket that connects the rear portion of the cushion frame and the lower end portion of the back frame (see, for example, Patent Document 1).

In the vehicle seat provided with the connection bracket described in Patent Document 1, the cushion frame and the connection bracket are fastened with bolts in a state in which the connection bracket is arranged outside the cushion frame in the seat width direction.
A reinforcing member having a threaded projection is welded to the cushion frame. The cushion frame and the connection bracket are fixed by fastening a bolt inserted from the connection bracket side to a threaded portion formed on the protrusion of the reinforcing member.
By welding a threaded reinforcing member to the cushion frame, the cushion frame and the connecting bracket can be fastened without threading the cushion frame itself formed of a relatively hard and thin metal material.

JP 2021-109535 A

By the way, in the case of a vehicle seat, since the assembling work is relatively complicated, it has been desired to improve the efficiency of the assembling work. For example, there has been a desire to reduce the number of components.
In particular, in a vehicle seat provided with a connecting bracket as disclosed in Patent Document 1, it is necessary to weld a threaded reinforcing member to the cushion frame when bolting the cushion frame and the connecting bracket. Therefore, it is composed of a plurality of component parts, and the number of parts may increase. Moreover, since the welding work becomes complicated, there is also a possibility that the work efficiency is lowered.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat and a vehicle seat manufacturing method that can reduce the number of parts and improve the efficiency of assembly work.

According to the vehicle seat of the present invention, there is provided a vehicle seat having a seat frame serving as a skeleton, the seat frame having a first frame member, a second frame member facing at least a part of the first frame member, and a fastening member driven into a portion where the first frame member and the second frame member face each other to fasten the first frame member and the second frame member. The second frame member has a first raised portion that rises along the fastening direction of the fastening member, and the second frame member has a second raised portion that is formed on the peripheral edge portion of the portion of the second frame member to which the fastening member is fastened, and has a second raised portion that rises along the fastening direction of the fastening member.
According to the method for manufacturing a vehicle seat of the present invention, the method includes a disposing step of disposing a first frame member and a second frame member facing at least a part of the first frame member, and a fastening step of fastening the first frame member and the second frame member by driving a fastening member from the first frame member side to the second frame member side to the portion where the first frame member and the second frame member are opposed, and in the fastening step, the fastening member is fastened to a peripheral portion of the portion of the first frame member to which the fastening member is fastened. The problem is solved by forming a first protruding portion protruding along the fastening direction of the member, and forming a second protruding portion protruding along the fastening direction of the fastening member on the peripheral portion of the portion of the second frame member to which the fastening member is fastened.
With the above configuration, it is possible to realize a vehicle seat capable of streamlining the assembly work, specifically, reducing the number of components.
Specifically, the fastening member forms a first ridge on the first frame member (eg, the cushion frame or the back frame) and a second ridge on the second frame member (eg, the connecting bracket). Therefore, even if the first frame member is not subjected to screw processing in advance, the first frame member and the second frame member are fixed in contact with the fastening member so that the peripheral edge portion of the portion where the fastening member is fastened protrudes along the fastening direction.
Generally, the connection bracket is fixed to the cushion frame or the back frame using a fastening bolt and a fastening nut, but with this configuration, the fastening nut can be eliminated. In addition, it is not necessary to preliminarily provide a fastening hole for fastening a fastening member in the connecting bracket or the cushion side frame, and the work of providing the fastening hole can also be eliminated. In addition, the work of fastening with the fastening member can be automated.
Therefore, it is possible to realize a vehicle seat in which the work for assembling the connecting bracket is made more efficient (no need for a fastening nut, the number of parts is reduced, the work process is shortened, and the fastening work is automated).

At this time, the seat frame may include a cushion frame and a back frame, the first frame member may be the cushion frame or the back frame, and the second frame member may be a connection bracket that connects the seat rear portion of the cushion frame and the lower portion of the back frame.
With the above configuration, it is possible to realize a vehicle seat in which the assembly work of the frame member is made efficient in the seat provided with the connection bracket that connects the cushion frame and the back frame.

At this time, it is preferable that the vehicle seat includes a pad material that is placed on the first frame member, the second frame member is arranged inside the first frame member in the seat width direction, at least one of the fastening member and the second raised portion protrudes inward in the seat width direction from the body portion of the second frame member, and the pad material is formed at a position corresponding to the at least one and has a relief portion for avoiding interference with the at least one.
With the above configuration, the pad material is provided with the relief portion, so that the fastening member or the second raised portion is arranged at a position that does not overlap with the pad material in the seat width direction. Therefore, when the pad material is arranged on the cushion frame or the back frame, it is possible to suppress interference between the connection bracket (peripheral portion of the portion where the fastening member is fastened) and the pad material.

At this time, it is preferable that a reclining device that rotatably connects the back frame to the cushion frame is provided, the reclining device is attached to the outer surface of the back frame, and has a reclining unit that restricts rotation of the back frame, and the second frame member is attached to the outer surface of the back frame and the inner surface of the reclining unit.
With the above configuration, in a seat equipped with a reclining device having a complicated structure, by using this fastening structure, the work of assembling the device can be made more efficient.

At this time, the back frame may have back side frames arranged on the left and right sides in the seat width direction, and at least one of the fastening member and the second raised portion may protrude inward in the seat width direction from the body portion of the second frame member, and may be arranged at a position not overlapping the back side frame in the seat width direction.
With the above configuration, the fastening member or the second raised portion projecting inward in the seat width direction from the main body portion of the connection bracket is arranged at a position that does not overlap with the back side frame in the seat width direction. Therefore, when the back frame rotates in the seat front-rear direction, it is possible to suppress interference between the connection bracket (peripheral portion of the portion to which the fastening member is fastened) and the back side frame.

At this time, it is preferable that a height link device that connects the cushion frame to the vehicle body floor so as to be able to move up and down is provided, the height link device has left and right links provided between the cushion frame and the vehicle body floor, and at least one of the fastening member and the second raised portion is arranged at a position that does not overlap with the link in the seat width direction.
With the above configuration, the fastening member or the second raised portion is arranged at a position that does not overlap with the link in the seat width direction. Therefore, when the height link device operates, it is possible to suppress interference between the connection bracket (peripheral portion of the portion where the fastening member is fastened) and the link.

At this time, it is preferable that the first frame member has a flange that is formed at an end portion in the vertical direction of the first frame member and that is bent and protrudes outward in the seat width direction, the first protruding portion protrudes outward in the seat width direction more than the body portion of the first frame member, and the protruding height of the first protruding portion is lower than the protruding height of the flange.
With the above configuration, the protruding portion of the first raised portion is accommodated in the space formed by, for example, the main body portion, the upper end flange, and the lower end flange of the cushion frame. Therefore, the connecting bracket can be arranged compactly in the seat width direction.

At this time, the vehicle seat includes a driving device attached to the first frame member and driven to switch a portion of the vehicle seat between a normal position and a moving position moved from the normal position, and a connecting member connected to the driving device to supply power to the driving device and extending along an inner surface of the first frame member, wherein the second frame member is arranged inside the first frame member in the seat width direction, and at least one of the fastening member and the second raised portion is provided on the second frame. It is preferable that the connecting member protrudes inward in the seat width direction from the main body portion of the member, and that the connecting member is arranged at a position different from the at least one of the inner side surfaces of the first frame member.
With the above configuration, the fastening member or the second raised portion is arranged at a position that does not overlap with the connecting member in the seat width direction. Therefore, when the connection member is arranged, it is possible to suppress interference between the connection bracket (peripheral portion of the portion to which the fastening member is fastened) and the connection member.

At this time, it is preferable that the first frame member and the second frame member are plate members, the second frame member is arranged inside the first frame member in the seat width direction, the plate thickness of the first frame member is thinner than the plate thickness of the second frame member, and the fastening members are fastened so as to be driven from the first frame member side to the second frame member side.
With the above configuration, the fastening member is fastened from the thin first frame member to the thick second frame member. Therefore, since the second frame member having a high strength is on the penetration side of the fastening member, the fastening member can be fixed more firmly.

Advantageous Effects of Invention According to the present invention, it is possible to realize a vehicle seat capable of streamlining assembly work, specifically, reducing the number of components. Specifically, a fastening nut can be dispensed with. In addition, it is not necessary to preliminarily provide a fastening hole for fastening a fastening member in the connecting bracket or the cushion side frame, and the work of providing the fastening hole can also be eliminated. In addition, the work of fastening with the fastening member can be automated.
Further, according to the present invention, it is possible to realize a vehicle seat in which the assembly work of the frame member is made efficient in the seat provided with the connection bracket that connects the cushion frame and the back frame.
Further, according to the present invention, when the pad material is arranged on the cushion frame or the back frame, it is possible to suppress interference between the connection bracket (the peripheral portion of the portion where the fastening member is fastened) and the pad material.
Further, according to the present invention, in a seat having a reclining device having a complicated structure, by using this fastening structure, the work of assembling the device can be made more efficient.
Further, according to the present invention, interference between the connecting bracket and the back side frame can be suppressed when the back frame rotates in the seat front-rear direction.
Further, according to the present invention, interference between the connecting bracket and the link can be suppressed when the height link device operates.
Further, according to the present invention, the connecting bracket can be arranged compactly in the seat width direction.
Further, according to the present invention, interference between the connecting bracket and the connecting member can be suppressed when the connecting member is arranged.
Further, according to the present invention, the second frame member having a high strength is on the penetration side of the fastening member, so that the fastening member can be fixed more firmly.

It is a perspective view of the vehicle seat of this embodiment. 1 is a perspective view of a seat frame that serves as a skeleton of a vehicle seat; FIG. It is a side view of a seat frame. It is a sectional view of the fastening structure of this embodiment. FIG. 4 is a cross-sectional view of the fastening structure, showing a state in which the fastening member is fastened; It is a sectional view of the fastening structure of a modification. It is a sectional view of the fastening structure of a modification, Comprising: It is a figure which shows the state which fastened the fastening member. FIG. 2 is a perspective view of a reclining device and the periphery of the reclining device; FIG. 4 is a cross-sectional view of the reclining device and the periphery of the reclining device, illustrating the positional relationship between the connecting bracket, the cushion frame, the back side frame, and the link. It is a figure which shows the state which mounted the pad material on the cushion frame.

A vehicle seat and a method for manufacturing a vehicle seat according to embodiments of the present invention will be described below with reference to FIGS. 1 to 8. FIG.
This embodiment relates to a vehicle seat having a connection bracket that connects a cushion frame and a back frame, the connection bracket being attached to the cushion frame (cushion side frame) by a fastening member, and the main feature of the vehicle seat invention being that the peripheral edge portion of the portion of the connection bracket and the cushion side frame to which the fastening member is fastened protrudes along the fastening direction of the fastening member.
The present invention also relates to an invention of a manufacturing method for the vehicle seat.
Note that the side of the seat back of the vehicle seat on which the passenger sits is the front side of the seat.

As shown in FIG. 1, the vehicle seat S of this embodiment is a vehicle seat, and includes a seat body including a seat cushion 1 and a seat back 2, a rail device 30 supporting the seat body so as to be movable forward and backward with respect to the vehicle floor, a height link device 40 connecting the seat body to the vehicle floor so as to be able to move up and down, a reclining device 50 rotatably connecting the seat back 2 to the seat cushion 1, a connecting bracket 60 connecting the seat cushion 1 and the seat back 2, and a vehicle seat. and a driving device 80 that drives a part thereof.
2 and 3, fastening positions P1 to P13 indicate fastening positions of screws 70, which are fastening members, and are arranged symmetrically with respect to the center line of the seat cushion 1 in the seat width direction. In the present embodiment, each member is fastened at the fastening positions P1 to P13, but the fastening positions are not limited to this, and can be changed as appropriate.

As shown in FIG. 1, the seat cushion 1 is a seating portion that supports an occupant from below, and is constructed by placing a pad material 1a on a cushion frame 10 shown in FIG.
The seatback 2 is a backrest portion that supports an occupant from behind, and is constructed by placing a pad material 2a on a back frame 20 shown in FIG.
The seat frame Sa includes a cushion frame 10 and a back frame 20. As shown in FIG. The cushion frame 10 and the back frame 20 are connected by a connecting bracket 60 .

As shown in FIG. 2, the cushion frame 10 is composed of a substantially rectangular frame body, and includes cushion side frames 11 arranged on the left and right sides, plate-shaped pan frames 12 that extend over the front end portions of the cushion side frames 11, a front connection frame 13 that connects the front portions of the cushion side frames 11, a rear connection frame 14 that connects the rear portions of the cushion side frames 11, and is latched to the pan frame 12 and the rear connection frame 14, and extends in a serpentine shape in the seat front-rear direction. It is mainly composed of a plurality of elastic springs 15 .

The cushion side frame 11 is a plate-shaped frame elongated in the seat front-rear direction.
A reclining device 50 is attached to the rear portion of the cushion side frame 11 via a connecting bracket 60, and a rail device 30 is attached to the lower portion via a height link device 40. - 特許庁A driving device 80 is attached to the outer surface of the seat front-rear direction central portion of the cushion side frame 11 .

As shown in FIG. 3, the rear portion of the cushion side frame 11 has a main body wall portion 11a that extends longitudinally in the seat front-rear direction, and an upper end flange 11b and a lower end flange 11c that are formed at the upper end portion and the lower end portion of the main body wall portion 11a and protrude by bending to one side (strictly speaking, to the outside) in the seat width direction. The upper end flange 11b and the lower end flange 11c extend from the position where the reclining device 50 is attached to the position where the pan frame 12 is attached in the cushion side frame 11 in the seat front-rear direction.

A connection bracket 60 is attached by a screw 70 to the inner surface of the main body wall portion 11a in the seat width direction. The cushion side frame 11 and the connecting bracket 60 are assembled with screws 70 at fastening positions P1 and P2.
Further, a driving device 80 is attached by a screw 70 to the outer surface of the main body wall portion 11a in the seat width direction. The cushion side frame 11 and the driving device 80 are assembled with screws 70 at fastening positions P3, P4 and P5.

As shown in FIG. 2 , the pan frame 12 is a plate-like construction frame that supports the thighs of the occupant, and the side portions in the seat width direction are placed on the upper surfaces of the cushion side frames 11 . The cushion side frames 11 and the pan frame 12 are assembled with screws 70 at fastening positions P6 and P7.
The front connecting frame 13 and the rear connecting frame 14 are pipe-shaped frames, respectively, which connect the left and right cushion side frames 11 and the left and right links (the first link 41 and the second link 42).
The elastic springs 15 are elastic support members that support the buttocks of the occupant, and are provided in plurality at predetermined intervals in the seat width direction.
A front end portion of the elastic spring 15 is hooked on a spring hooking portion 12 a formed on the upper surface of the pan frame 12 . A rear end portion of the elastic spring 15 is attached to the rear connecting frame 14 via a hook member.

As shown in FIG. 2, the back frame 20 is composed of a substantially rectangular frame-like body, and is mainly composed of back side frames 21 arranged on the left and right sides, an inverted U-shaped upper frame 22 connecting the upper end portions of the respective back side frames 21, a plate-shaped lower frame 23 connecting the lower end portions of the respective back side frames 21, and elastic springs (not shown) hooked to the respective back side frames 21 and extending in a serpentine shape.
The back side frame 21 is a sheet metal member that extends vertically and has a substantially C-shaped cross section.
The lower frame 23 is a plate-shaped sheet metal member extending in the left-right direction, and is connected to the lower end portion of each back side frame 21 . The back side frame 21 and the lower frame 23 are assembled with screws 70 at fastening positions P8 and P9.
In the above configuration, the back frame 20 can rotate relative to the cushion frame 10 .

As shown in FIG. 2, the rail device 30 is arranged between the seat body and the vehicle body floor in the vertical direction, and mainly includes left and right lower rails 31 fixed to the vehicle body floor and extending in the seat front-rear direction, left and right upper rails 32 slidably supported along the lower rails 31, a locking member (not shown) for locking the upper rails 32 to the lower rails 31 so that the upper rails 32 cannot slide, and a rail operation lever 33 for releasing the locked state of the locking member.
A cushion frame 10 is installed on the upper surfaces of the left and right upper rails 32 via a height link device 40 .

As shown in FIG. 2, the height link device 40 is attached between the rail device 30 and the cushion frame 10, and is mainly composed of left and right first links 41 arranged on the front side of the seat, left and right second links 42 arranged on the rear side of the seat, a brake unit (not shown) for regulating the lifting operation of the seat body, and a height control lever 43 (see FIG. 1) for releasing the regulated state of the brake unit.
When the height control lever 43 is operated, the second link 42 (left second link) becomes a drive link, and the right second link 42 and the left and right first links 41 also rotate. As a result, the seat body is raised and lowered to adjust the seat height.
The rail device 30 and the height link device 40 are assembled with screws 70 at fastening positions P10 and P11.
The height link device 40 may be manually operated by the height control lever 43, or may be automatically operated using a driving device 80 described later, which is driven by operating a button (not shown).

The reclining device 50 is a device capable of rotatably connecting the back frame 20 to the cushion frame 10 and locking the back frame 20, as shown in FIGS.
The reclining device 50 mainly includes a reclining unit 51 that regulates the rotation of the back frame 20, a rotation shaft 52 that is pivotally supported in the seat width direction by the lower end portion of the back frame 20 and protrudes from the outer surface of the back frame 20 and is connected to the reclining unit 51, and a spiral spring 53 that is attached to the outside of the reclining unit 51 in the seat width direction and biases the back frame 20 to rotate toward the cushion frame 10 around the rotation shaft 52.

The reclining unit 51 can switch the state of the back frame 20 between a locked state in which the back frame 20 is fixed to the cushion frame 10 and an unlocked state in which the back frame 20 is relatively rotatable.
In the reclining unit 51, the state of the back frame 20 is normally locked, and when the reclining operation lever 55 shown in FIG.
While the back frame 20 is in the unlocked state, the occupant can tilt the seat back 2 rearward, and when the rearward tilt angle reaches a desired angle, the reclining operation lever 55 is released to return to the locked state.
The reclining unit 51 may be manually operated by the reclining operation lever 55, or may be automatically operated by a driving device 80 driven by button operation (not shown).

The rotating shaft 52 is arranged between the left and right cushion side frames 11 with its axial direction along the seat width direction, and the extending end of the rotating shaft 52 protrudes outward in the seat width direction through a shaft hole 21a formed in the side surface of the back side frame 21.
The protruding end of the rotating shaft 52 is assembled with the reclining unit 51, and further assembled with the reclining operation lever 55 shown in FIG.

The spiral spring 53 urges the back frame 20 to rotate toward the cushion frame 10 around the rotation shaft 52 when the back frame 20 is in the unlocked state and the back frame 20 is in the backward tilted state.
As shown in FIGS. 2 and 3, the spiral spring 53 is configured such that one end 53a thereof is hooked to a projecting portion of a spring locking bracket 54 on the back side frame 21 side. The spiral spring 53 is configured such that the other end 53b is hooked to the spring locking portion 61 of the connection bracket 60 on the cushion frame 10 side.
A spring lock bracket 54 is attached to the outer surface of the lower portion of the backside frame 21 . The recliner device 50 is attached to the back frame 20 via spring lock brackets 54 and connecting brackets 60 . The back frame 20 and the reclining device 50 are assembled with screws 70 at fastening positions P12 and P13.

The connection bracket 60 is a metal plate that connects the rear portion of the cushion frame 10 and the lower portion of the back frame 20, as shown in FIGS.
A central portion of the connection bracket 60 is fitted to the outer surface of the reclining unit 51 attached to the back side frame 21 .
Also, the front portion and the lower portion of the connection bracket 60 are fastened to the inner surface of the cushion side frame 11 .
An upper portion of the connecting bracket 60 is formed with a spring engaging portion 61 that protrudes outward in the seat width direction and engages the other end portion 53b of the spiral spring 53 .

As shown in FIGS. 2 and 3, the driving device 80 is attached to the outer surface of the central portion of the cushion side frame 11 in the seat front-rear direction. The driving device 80 is an electric motor that generates power in response to supply of electric power. The driving device 80 rotates the first link 41 and the second link 42 with respect to the rail device 30 about the horizontal axis in accordance with the power of the driving device 80 to cause the cushion side frame 11 to move up and down.
The drive device 80 may drive the rail device 30 and the height link device 40, or may drive other seat movable members. For example, a blower device (not shown) arranged under the seat cushion 1 to blow air toward the passenger sitting on the seat, or the reclining device 50 described above may be driven.

<FDS (flow drill screw) structure>
The connection member 81 is a wire harness formed by bundling a plurality of electric wires (transmission paths), and electrically connects the driving device 80 and the height link device 40 . The connecting member 81 connected to the driving device 80 is inserted from the seat width direction outside of the cushion side frame 11 to the seat width direction inside through the insertion hole 11h provided in the cushion side frame 11 . The connecting member 81 extends along the inner surface of the cushion side frame 11 and is connected to the height link device 40 .

Here, the fastening structure and the fastening member of this embodiment will be described with reference to FIGS. 4 and 5. FIG.
As shown in FIG. 4, the fastening structure of the present embodiment is a structure in which a cushion side frame 11 as an example of a first frame member and a connecting bracket 60 as an example of a second frame member are superimposed and fastened with screws 70. In this embodiment, the plate thickness of the main body portion of the cushion side frame 11 is thinner than the plate thickness of the main body portion of the connection bracket 60 .
The surface of the cushion side frame 11 on the insertion side in the fastening direction (penetration direction) of the screw 70 is referred to as a first surface 11d, and the surface opposite to the first surface 11d and in contact with the connection bracket 60 is referred to as a first opposing surface 11e. Similarly, the surface of the connecting bracket 60 that penetrates the screw 70 in the fastening direction is referred to as a second surface 60d, and the surface opposite to the second surface 60d and in contact with the cushion side frame 11 is referred to as a second opposing surface 60e.

The fastening structure of this embodiment is an FDS (flow drill screw) structure in which fastened members (cushion side frames 11 and connecting brackets 60) are softened by high-speed rotation of the fastening members (screws 70), and pressed and joined by axial pressure.
As shown in FIGS. 4A and 4B, the screw 70 has a screw head 71 and a threaded portion 73. Inside the screw head 71, a recessed portion 72 recessed on the opposite side of the threaded portion 73 is formed. The hollow portion 72 has an annular outer shape in plan view. The material of the screw 70 is, for example, metal such as steel, but is not limited to this.

As shown in FIG. 4A, first, the first facing surface 11e of the cushion side frame 11 and the second facing surface 60e of the connection bracket 60 are laminated in a superimposed state. By rotating the screw 70 from the first surface 11d of the cushion side frame 11 in a state in which both are laminated, a hole is opened by frictional heat. The cushion side frame 11 and the connection bracket 60 are fastened by being threaded.
As shown in FIG. 4B, after fastening, chips generated by threading the screw 70 protrude toward the insertion side in the fastening direction at the periphery of the fastening portion of the first surface 11d of the cushion side frame 11, forming a first protuberance 11f on the cushion side frame 11. The first raised portion 11 f is accommodated in a screw head space portion 75 inside the recess portion 72 of the screw head portion 71 .
Also, chips generated by thread cutting rise toward the penetration side in the fastening direction on the periphery of the fastening portion of the first opposing surface 11e of the cushion side frame 11, forming a third raised portion 11g on the cushion side frame 11. A space portion 74 is formed by the third raised portion 11g between the first opposing surface 11e and the second opposing surface 60e. Note that the cushion side frame 11 and the connection bracket 60 may be tightly fastened without forming the space 74 .

Similarly, chips generated by threading the screw 70 protrude toward the penetration side in the fastening direction on the peripheral edge of the fastening portion of the second surface 60d of the connection bracket 60, forming a second protuberance 60f on the connection bracket 60. Although not shown, chips generated by thread cutting may bulge toward the insertion side in the fastening direction on the periphery of the fastening portion of the second facing surface 60e of the connection bracket 60, and a ridge may be formed on the opposite side of the second ridge 60f.

The first protruding portion 11f, the second protruding portion 60f, and the third protruding portion 11g protrude along the direction in which the screws 70 are fastened in the peripheral portions of the cushion side frames 11 and the connecting brackets 60 where the screws 70 are fastened. The cushion side frame 11 and the connection bracket 60 are brought into close contact with the threaded portion 73 by rising chips generated by threading.
With such a fastening structure, the screw 70 can be detachably coupled to the cushion side frame 11 and the connection bracket 60 . In addition, it is possible to eliminate the need for drilling a pilot hole. Also, the joint strength of the members to be fastened can be increased. In addition, multi-layer joining of members to be fastened can be realized even between different materials. Furthermore, with this fastening structure, automation is possible, and work efficiency can be improved. In addition, no sparks or smoke are generated during fastening work, and environmental pollution can be suppressed.

Further, in this embodiment, the screw 70 penetrates from the thin cushion side frame 11 toward the thick connection bracket 60 . As a result, the connecting bracket 60 having a high strength is located on the side where the screw 70 penetrates, so that the screw 70 can be fixed more firmly.

<SPR (self-piercing rivet) structure>
A modification of the fastening structure is shown in FIG. This fastening structure is an SPR (self-pierce riveting) structure in which the upper base material (cushion side frame 111) is penetrated by pressing the fastening member (rivet 170), and the lower base material (connection bracket 160) is joined without being penetrated.
The rivet 170 has a disk-shaped rivet head 171 and a cylindrical rivet shaft 172 . The diameter of the rivet head 171 is larger than the outer diameter of the rivet shaft portion 172, but may be the same as the outer diameter of the shaft portion 12b. The material of the rivet 170 is, for example, metal such as steel, but is not limited to this.

As shown in FIG. 5A, first, the first facing surface 111e of the cushion side frame 111 and the second facing surface 160e of the connection bracket 160 are laminated in a superimposed state. In the state where both are laminated, the rivet head 171 is pressed from the first surface 111d of the cushion side frame 111 by a general-purpose pressing device, and the rivet 170 is driven. As the driving operation progresses, the cushion side frame 111 is plastically deformed so as to bulge toward the first facing surface 111e, and the connection bracket 160 is plastically deformed so as to bulge toward the second surface 160d. As the driving operation progresses further, the rivet shaft portion 172 of the rivet 170 begins to expand from the tip side and cuts into the cushion side frame 111 .
As shown in FIG. 5B, rivet 170 passes through cushion side frame 111 but does not pass through connecting bracket 160 . Joining is completed when the rivet head 171 is substantially flush with the first surface 111 d of the cushion side frame 111 . The rivet shaft portion 172 spreads so as to bite into the cushion side frame 111 and the connection bracket 160 . Therefore, the two companies are firmly fixed by the caulking effect.

After fastening, the rivet shafts 172 of the rivets 170 form on the cushion side frame 111 a first raised portion 111f that protrudes toward the penetration side in the fastening direction at the peripheral edge of the fastening portion of the first opposing surface 111e of the cushion side frame 111.
Similarly, on the connecting bracket 160, the rivet shaft 172 forms a second raised portion 160f that protrudes toward the penetration side (extrusion side) in the fastening direction (the driving direction) at the periphery of the fastening portion (the driving portion) of the second surface 160d of the connecting bracket 160.
The second raised portion 160f has a curved cross-sectional shape. Therefore, even if a worker or another member comes into contact with the second protruding portion 160f, the safety of the worker can be ensured, and damage to the member can be suppressed.

The first protruding portion 111f and the second protruding portion 160f are respectively formed on the peripheral portion of the cushion side frame 111 or the connecting bracket 160 where the rivet 170 is driven, and protrude along the driving direction of the rivet 170.
By adopting such a fastening structure, the rivets 170 can be fastened to the cushion side frames 111 and the connection brackets 160 while eliminating the need to drill pilot holes. Also, the joint strength of the members to be fastened can be increased. In addition, multi-layer joining of members to be fastened can be performed even between different materials. Furthermore, with this fastening structure, automation is possible, and work efficiency can be improved. In addition, no sparks or smoke are generated during fastening work, and environmental pollution can be suppressed.

The vehicle seat according to the present embodiment will now be described with reference to FIGS. 6 to 8 for each frame member using the fastening structure using screws 70 shown in FIG.
As shown in FIG. 6, at the fastening position P1, the lower portion of the connecting bracket 60 and the lower rear portion of the main body wall portion 11a of the cushion side frame 11 are overlapped so that the cushion side frame 11 is positioned outside in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction. At the fastening position P2, the front portion of the connecting bracket 60 and the rear upper portion of the main body wall portion 11a of the cushion side frame 11 are overlapped so that the cushion side frame 11 is outside in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction.
With the above configuration, the connection bracket 60 can be efficiently assembled to the inner surface of the cushion side frame 11 . Specifically, it is possible to eliminate the need for a fastening nut, reduce the number of parts, and shorten the work process.

Further, the connection bracket 60 is connected to the back side frame 21 via the spring locking bracket 54 on the inner side of the reclining device 50 in the seat width direction. At this time, at fastening positions P12 and P13, the spring locking brackets 54 and the lower portions of the back side frames 21 are overlapped so that the spring locking brackets 54 are outside in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction.
With the above configuration, the connecting bracket 60 can be efficiently assembled to the outer side surface of the back side frame 21 .
At fastening positions P8 and P9, the seat rear side of the lower end portion of the back side frame 21 and the seat width direction end portion of the lower frame 23 are overlapped so that the back side frame 21 is on the seat front side. In this state, the screw 70 is tightened from the rear side of the seat.
With the above configuration, the lower frame 23 can be efficiently attached to the seat rear side surface of the back side frame 21 .

As shown in FIG. 2, at the fastening positions P3, P4, and P5, the body wall portion 11a of the cushion side frame 11 and the driving device 80 are overlapped so that the driving device 80 is on the outer surface in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction.
With the above configuration, the driving device 80 can be efficiently assembled to the seat width direction outer surface of the cushion side frame 11 .
At fastening positions P6 and P7, the upper end flanges 11b of the cushion side frames 11 and the seat width direction end portions of the pan frame 12 are overlapped so that the pan frame 12 is on the upper side of the seat. In this state, the screw 70 is tightened from above the seat.
With the above configuration, the pan frame 12 can be efficiently attached to the side surface of the cushion side frame 11 above the seat.

Also, at the fastening position P10, the lower end portion of the second link 42 of the height link device 40 and the rail device 30 are overlapped so that the second link 42 is on the inner side in the seat width direction. In this state, the screw 70 is tightened from the inner side in the seat width direction. At the fastening position P11, the lower end portion of the first link 41 of the height link device 40 and the rail device 30 are overlapped so that the first link 41 is on the inner side in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction.
With the above configuration, the rail device 30 can be efficiently assembled to the height link device 40 .

The tightening direction of the screws 70 at the tightening positions P1 to P13 of the present embodiment is not limited to this, and the screws 70 may penetrate from opposite sides. For example, when assembling the connecting bracket 60 to the inner surface of the cushion side frame 11 , the screw 70 may be passed through from the connecting bracket 60 toward the cushion side frame 11 and fastened. Further, in the present embodiment, for example, the connecting bracket 60 is attached to the inner side surface of the cushion side frame 11, but the connecting bracket 60 may be attached to the outer side surface of the cushion side frame 11 without being limited to this. Furthermore, in this case as well, the fastening direction may be through from the outside in the seat width direction or from the inside in the seat width direction.

In the above configuration, as shown in FIG. 7, the screw 70 located at the fastening position P2 fastens the connecting bracket 60 and the cushion side frame 11 from the outside in the seat width direction in a state where the cushion side frame 11 is superimposed on the outside in the seat width direction. At this time, the screw 70 and the second raised portion 60f protrude inward in the seat width direction from the main body portion of the connection bracket 60 . The screw 70 and the second protruding portion 60f are arranged at positions that do not overlap with the back side frame 21 in the seat width direction.
Therefore, the connection bracket 60 can be arranged compactly in the seat width direction. Moreover, when the back frame 20 rotates in the seat front-rear direction, interference between the connection bracket 60 (the screw 70 and the second raised portion 60f) and the back side frame 21 can be suppressed.

In the above configuration, as shown in FIG. 7, the peripheral portion of the screw 70 and the second link 42 are arranged at different positions in the seat width direction.
Therefore, when the height link device 40 operates, it is possible to prevent the connection bracket 60 (the screw 70 and the second raised portion 60f) and the second link 42 from interfering with each other.

In the above configuration, as shown in FIG. 7, the peripheral portion of the screw head 71 of the screw 70 protrudes outward in the seat width direction from the main body wall 11a in the space surrounded by the main body wall 11a of the cushion side frame 11, the upper end flange 11b, and the lower end flange 11c. As described above, the first raised portion 11 f fits in the screw head space 75 within the recess 72 of the screw head 71 of the screw 70 . That is, the projection height of the first raised portion 11f is lower than the projection heights of the upper end flange 11b and the lower end flange 11c.
By doing so, the screw head 71 of the screw 70 can be arranged compactly, and interference of the screw 70 with other members can be suppressed. In addition, since the first raised portion 11f is lower than the projection height of the upper end flange 11b and the lower end flange 11c and is covered with the screw head 71, it is possible to suppress damage to other members by the first raised portion 11f.

In the above configuration, as shown in FIG. 8, the screw 70 located at the fastening position P2 overlaps the connection bracket 60 and the cushion side frame 11 so that the cushion side frame 11 is outside in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction. At this time, the screw 70 and the second raised portion 60f protrude inward in the seat width direction from the main body portion of the connection bracket 60 .
The pad material 1 a is placed on the cushion side frames 11 of the cushion frame 10 . A relief portion 1c is formed in the pad material 1a at a position corresponding to the peripheral portion of the screw 70 positioned at the fastening position P2. The relief portion 1c is formed in the pad material 1a so that the screw 70 positioned at the fastening position P2 and the second raised portion 60f do not interfere with each other.
In this way, the screw 70 and the second raised portion 60f that protrude inward in the seat width direction from the main body portion of the connection bracket 60 are arranged at positions that do not overlap the pad material 1a in the seat width direction. Therefore, when the pad material 1a is placed on the cushion side frame 11, interference between the pad material 1a and the peripheral portion of the screw 70 positioned at the fastening position P2 of the connection bracket 60 can be suppressed.
The relief portion 1c may be formed in a concave shape, or may be formed in a shape in which a portion of the pad material 1a is missing. Further, the direction of avoiding interference may be the vertical direction of the seat or the width direction of the seat.

In the above configuration, as shown in FIGS. 2 and 3, the screws 70 positioned at the fastening positions P4 and P5 overlap the driving device 80 and the cushion side frame 11 so that the driving device 80 is outside in the seat width direction. In this state, the screw 70 is tightened from the outside in the seat width direction. At this time, the screw 70 and the second protruding portion 60f protrude inward in the seat width direction from the main body portion of the cushion side frame 11 .
The connection member 81 is inserted from the seat width direction outside of the cushion side frame 11 to the seat width direction inside through the insertion hole 11h provided in the cushion side frame 11 . The connection member 81 extends along the inner surface of the cushion side frame 11 and is connected to the height link device 40 . At this time, the connection member 81 is arranged so as to avoid positions corresponding to peripheral portions of the screws 70 located at the fastening positions P4 and P5.
In this way, the screw 70 and the second raised portion 60f that protrude inward in the seat width direction from the body portion of the cushion side frame 11 are arranged at positions that do not overlap the connection member 81 in the seat width direction. Therefore, when the connection member 81 is arranged, interference between the peripheral portions of the screws 70 positioned at the fastening positions P4 and P5 and the connection member 81 can be suppressed.
The connecting member 81 is not limited to the fastening positions P4 and P5, and is arranged so as to avoid the position corresponding to the peripheral portion of the screw 70 in the peripheral portion of the screw 70 at the fastening position near where the connecting member 81 is arranged.

In the above configuration, as shown in FIG. 6, a cutout portion 62 is formed in a portion of the outer peripheral portion of the connection bracket 60 that is close to the rear connection frame 14 and is cut toward the side opposite to the rear connection frame 14 side.
Therefore, interference between the connection bracket 60 and the rear connection frame 14 can be suppressed.
Note that the notch portion 62 is cut out in a substantially triangular shape, and is sandwiched between the two fastening positions P1 and P2.

Further, in the above configuration, as shown in FIG. 6, the fastening position P2 is positioned in front of the seat from the fastening position P1. The fastening position P1 is positioned so as to overlap the rear connection frame 14 in the seat longitudinal direction and overlap the reclining unit 51 in the vertical direction. The fastening position P2 is positioned so as to overlap the reclining unit 51 in the seat front-rear direction and overlap the rear connecting frame 14 in the vertical direction.
Therefore, the assembly rigidity of the reclining unit 51 and the rear connection frame 14 can be increased.

<Other embodiments>
In the above embodiment, as shown in FIG. 2, the vehicle seat S includes the rail device 30, the height link device 40, and the reclining device 50, but is not particularly limited.
That is, the vehicle seat S does not have to include the rail device 30 , the height link device 40 and the reclining device 50 .
Further, the height link device 40 and the reclining device 50 may be operated by driving the driving device 80, or may be operated by manual operation of levers.

2 and 3, the cushion side frame 11, the pan frame 12, the back side frame 21, the lower frame 23, the rail device 30, the height link device 40, the reclining device 50, the connection bracket 60, and the drive device 80 are respectively fastened by this fastening structure at the fastening positions P1 to P13 as shown in FIGS. Examples include height brakes, hook springs, and member frames.
Even in that case, the fastening direction (strike direction) of the rivet 170 is not limited to this, and the rivet 170 may be driven from any direction of the member to be fastened.

In the above embodiment, each frame member is fastened at the fastening positions P1 to P13 by the fastening structure using screws 70 shown in FIG.
Even in that case, the fastening direction (strike direction) of the rivet 170 is not limited to this, and the rivet 170 may be driven from any direction of the member to be fastened.

In the above-described embodiment, as shown in FIGS. 4 and 5, the cushion side frame 11 and the connecting bracket 60 are not pre-formed with holes for fastening, but there is no particular limitation. A hole for fastening may be formed in advance in the cushion side frame 11 and the connection bracket 60 .

In the above embodiment, the connecting bracket 60 is attached to the inner surface of the cushion side frame 11 as shown in FIG.
In that case, it is preferable that the cushion side frame 11 has a stepped shape bent inward in the seat width direction.

In the above embodiment, the connecting bracket 60 is attached to the outer surface of the backside frame 21 as shown in FIG.

In the above embodiment, a vehicle seat used in an automobile has been described as a specific example, but the seat is not particularly limited, and can be used as a vehicle seat for trains, buses, etc., as well as for vehicles such as airplanes and ships.

In this embodiment, the vehicle seat and the method for manufacturing the vehicle seat according to the present invention have been mainly described.
However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from its spirit, and the present invention includes equivalents thereof.

S Vehicle seat Sa Seat frame 1 Seat cushion 1a, 2a Pad material 1b, 2b Skin material 1c Escape portion 2 Seat back 10 Cushion frame 11 Cushion side frame (first frame member)
11a main body wall portion 11b upper end flange 11c lower end flange 11d first surface 11e first opposing surface 11f first raised portion 11g third raised portion 11h insertion hole 12 pan frame 12a spring latching portion 13 front connecting frame 14 rear connecting frame 15 elastic spring 20 back frame 21 back side frame (first frame member)
22 Upper frame 23 Lower frame 30 Rail device 31 Lower rail 32 Upper rail 33 Rail operation lever 40 Height link device 41 First link 42 Second link (driving link)
43 Height control lever 50 Reclining device 51 Reclining unit 52 Rotating shaft 53 Spiral spring 53a One end 53b Other end 54 Spring locking bracket 55 Reclining control lever 60 Connection bracket (second frame member)
60d second surface 60e second facing surface 60f second raised portion 61 spring locking portion 62 notch portion 70 screw (fastening member)
71 screw head 72 recessed portion 73 screw portion 74 space portion 75 screw head space portion 80 drive device 81 connecting member 111d first surface 111e first opposing surface 111f first protruding portion 160d second surface 160e second opposing surface 160f second protruding portion 170 rivet (fastening member)
171 rivet head 172 rivet shaft P1 to P13 fastening position

Claims (10)

A vehicle seat having a seat frame serving as a skeleton,
The seat frame is
a first frame member;
a second frame member facing at least a portion of the first frame member;
a fastening member driven into a portion where the first frame member and the second frame member face each other to fasten the first frame member and the second frame member;
the first frame member has a first protruding portion formed on a peripheral edge portion of the portion of the first frame member to which the fastening member is fastened and protruding along the fastening direction of the fastening member;
The vehicle seat, wherein the second frame member has a second protuberant portion which is formed on a peripheral edge portion of the portion of the second frame member to which the fastening member is fastened and which protrudes along the fastening direction of the fastening member. The seat frame has a cushion frame and a back frame,
The first frame member is the cushion frame or the back frame,
2. The vehicle seat according to claim 1, wherein the second frame member is a connection bracket that connects the seat rear portion of the cushion frame and the lower portion of the back frame. The vehicle seat includes a padding material placed on the first frame member,
The second frame member is arranged inside the first frame member in the seat width direction,
at least one of the fastening member and the second raised portion protrudes inward in the seat width direction from the body portion of the second frame member;
3. The vehicle seat according to claim 2, wherein said pad material is formed at a position corresponding to said at least one and has a relief portion for avoiding interference with said at least one. a reclining device that rotatably connects the back frame to the cushion frame;
The reclining device has a reclining unit attached to the outer surface of the back frame and restricting rotation of the back frame,
4. A vehicle seat according to claim 2 or 3, wherein said second frame member is attached to the outer surface of said back frame and attached to the inner surface of said reclining unit. The back frame has back side frames arranged on the left and right sides in the seat width direction,
At least one of the fastening member and the second protrusion,
projecting inward in the seat width direction from the main body portion of the second frame member, and
5. The vehicle seat according to claim 4, wherein the back side frame is arranged at a position not overlapping with the back side frame in the seat width direction. a height link device for connecting the cushion frame to the vehicle body floor so as to be able to move up and down;
The height link device has left and right links provided between the cushion frame and the vehicle body floor,
6. The vehicle seat according to claim 5, wherein at least one of the fastening member and the second raised portion is arranged at a position not overlapping with the link in the seat width direction. The first frame member has a flange formed at an end portion in the vertical direction of the first frame member and bent outward in the seat width direction to project,
the first raised portion protrudes outward in the seat width direction from the body portion of the first frame member;
7. A vehicle seat according to any one of claims 2 to 6, wherein the projection height of the first raised portion is lower than the projection height of the flange. The vehicle seat includes:
a drive mounted to the first frame member for driving a portion of the vehicle seat to switch between a normal position and a moved position displaced from the normal position;
a connecting member extending along an inner surface of the first frame member connected to the drive for supplying power to the drive;
The second frame member is arranged inside the first frame member in the seat width direction,
at least one of the fastening member and the second raised portion protrudes inward in the seat width direction from the body portion of the second frame member;
8. A vehicle seat according to any one of claims 2 to 7, wherein said connecting member is arranged at a position different from said at least one inner surface of said first frame member. The first frame member and the second frame member are plate members,
The second frame member is arranged inside the first frame member in the seat width direction,
the plate thickness of the first frame member is thinner than the plate thickness of the second frame member,
The vehicle seat according to any one of claims 2 to 8, wherein the fastening member is fastened so as to be driven from the first frame member side to the second frame member side. A method of manufacturing a vehicle seat having a seat frame serving as a skeleton, comprising:
an arrangement step of arranging a first frame member and a second frame member facing at least a portion of the first frame member;
a fastening step of fastening the first frame member and the second frame member by driving a fastening member from the first frame member side to the second frame member side to the portion where the first frame member and the second frame member face each other;
In the fastening step,
forming a first protuberance protruding along the direction in which the fastening member is fastened on the peripheral portion of the portion of the first frame member to which the fastening member is fastened; and
A method of manufacturing a vehicle seat, comprising: forming a second protuberant portion that protrudes along a direction in which the fastening member is fastened in a peripheral edge portion of the portion of the second frame member to which the fastening member is fastened.