JP2015003587A - Seat frame structure of vehicle seat and seat frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably weld and form a seat frame structure while allowing relatively large tolerance to be set in a welding part.SOLUTION: In a seat frame structure of a vehicle seat, a first member (6d) includes: a welding part 10 which is disposed so as to be at least partially separated from the second member (6a) in a state that the first member (6d) is placed at a position where the first member (6d) is integrated with the second member (6a); and a pressing part 14 which is disposed separated from the second member (6a) so that its separation distance becomes larger than or equal to a separation distance of the welding part 10. The pressing member 14 is pressed against the second member (6a) while being pressed to cause the welding part 10 to follow the pressing part 14 and make surface contact with the second member (6a).

Description

  The present invention relates to a seat frame structure for a vehicle seat in which a first member (made of metal) forming a part of a seat frame and a second member (made of metal) different from the first member are integrated by laser welding, and It relates to the seat frame.

As this type of seat frame structure, the structure of a seat frame disclosed in Patent Document 1 is known. A known seat frame is a substantially rectangular frame (made of metal) that forms a skeleton of a vehicle seat, and a plurality of parts (first part, second part, third part) are integrated by laser welding. Is formed.
Here, the first component (corresponding to the side frame) is a flat plate member that forms a side skeleton, and has a joint surface that can contact the second component and the third component. The second part (corresponding to the lower frame) is a flat plate member forming a lower skeleton, and can be fixed by welding to the lower part of the first part. The third part (corresponding to the upper frame) is a flat plate member that forms an upper skeleton, and can be fixed by welding to the upper part of the first part.
In the known technique, after the first part to the third part are arranged at appropriate positions, for example, the bonding surface of the first part is arranged facing the third part. At this time, a part of the joining surface (welded part) of the first part is made substantially flat, and is brought into surface contact with the third part without generating a gap as much as possible. Then, with the clamp device, the first part (welded part) is integrated with the third part by laser welding while the other part (substantially flat pressing part) of the first part is pressed against the third part. To do.

Patent No. 5127453 specification

By the way, in a well-known technique, both a welding part and a press part (all are flat surfaces) are formed in the joint surface of a 1st component. Since the welded portion is brought into surface contact with the third part before the pressing portion is pressed, the entire joint surface (particularly the welded portion) needs to be formed accurately and flatly, resulting in a manufacturing error (large tolerance) of the welded portion. The configuration was unacceptable.
The present invention was devised in view of the above points, and the problem to be solved by the present invention is to stably weld the seat frame structure while enabling a relatively large tolerance to be set in the welded portion. It is to form.

  As means for solving the above-mentioned problems, the seat frame structure of the vehicle seat of the first invention has a metal seat frame forming a seat skeleton. Then, the first member and the second member are integrated by laser welding the welded portion of the first member forming a part of the seat frame while bringing the welded portion into surface contact with the second metal member different from the first member. It is the composition which becomes. In this type of configuration, it is desirable that the seat frame structure can be stably welded while allowing a relatively large tolerance to be set in the weld.

Therefore, in the present invention, in the state where the above-mentioned first member is disposed at a position where it is integrated with the second member, a welded portion at least partially spaced from the second member and a welded portion or more (preferably welded). And a pressing portion that is spaced apart from the second member with a separation dimension (larger than the portion). And it was set as the structure which follows the press part and surface-contacts a 2nd member by pressing against a 2nd member side, pressing a press part.
In the present invention, the welded part (a part or all) of the first member is disposed away from the second member (a configuration in which a relatively large tolerance can be set). Then, the first member and the second member can be stably welded and integrated with each other by laser welding by causing the welded portion to follow the pressing operation of the pressing portion and come into surface contact with the second member. .

The seat frame structure of the vehicle seat of the second invention is the seat frame structure of the vehicle seat of the first invention, wherein the first member is disposed at a position where it is integrated with the second member, and the pressing portion And a starting point portion that is provided at a position different from that of the second member. Then, by pressing against the second member side while pressing the pressing portion, the welded portion comes into surface contact while approaching the second member starting from the starting portion.
In the present invention, the welded portion can be more reliably brought into surface contact with the second member by the starting portion.

The seat frame structure for a vehicle seat according to the third aspect of the invention is the seat frame structure for a vehicle seat according to the second aspect, in which a welded portion is disposed between the starting point portion and the pressing portion.
In the present invention, the welded portion is arranged between the starting point portion and the pressing portion, so that the welded portion can be more reliably brought into surface contact with the second member from the starting point portion as the starting point by the pressing operation of the pressing portion. it can.

A seat frame for a vehicle seat according to a fourth aspect of the present invention is a metal seat frame that forms a skeleton of a vehicle seat including a first member that forms part of the seat frame and a second member that is different from the first member. . The first member includes a pressing portion that can be pressed against the second member side by pressing, and a welding portion that is adjacent to the pressing portion and is integrated with the second member by laser welding in a surface contact state.
In the present invention, the pressing portion is provided at the end of the first member, and includes a pressing portion that can be pressed against the second member, and a connecting portion that is disposed between the pressing portion and the welded portion, The connection part is formed in a direction away from the second member as it goes from the welded part to the pressing part. And in the pressing part at the time of a press, while a connection site | part is bent and deformed to the 2nd member side, while a pressing site | part is pressed by the 2nd member, in a pressing part at the time of non-pressing, a connection site | part returns to an original state. Thus, the pressing portion is disposed away from the second member.
In the present invention, the welded part (a part or all) of the first member is disposed away from the second member (a configuration in which a relatively large tolerance can be set). Then, the first member and the second member can be stably welded and integrated with each other by laser welding by causing the welded portion to follow the pressing operation of the pressing portion and come into surface contact with the second member. .

  According to the first aspect of the present invention, the seat frame structure can be stably welded and formed while allowing a relatively large tolerance to be set in the welded portion. According to the second invention, the seat frame structure can be formed more stably. According to the third invention, the seat frame structure can be formed more stably. According to the fourth aspect of the invention, the seat frame can be stably welded and formed while allowing a relatively large tolerance to be set in the welded portion.

It is a partial perspective view of a vehicle seat. It is a front view of a seat frame. It is a disassembled perspective view of a seat frame. FIG. 4 is a cross-sectional view of a part of the seat frame corresponding to a portion broken along line IV-IV in FIG. 2. It is sectional drawing of a part of seat frame which shows a welding process, (a) is a figure before welding, (b) is a figure in the middle of welding, (c) is a figure after welding. It is sectional drawing of a part of seat frame before welding concerning a modification.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. In each figure, a reference symbol F is attached to the front of the vehicle seat, a reference symbol B to the rear of the vehicle seat, a reference symbol UP to the upper side of the vehicle seat, and a reference symbol DW to the lower side of the vehicle seat. 4 and 6, the gap between the upper frame and the side frame is exaggerated for convenience.
The vehicle seat 2 in FIG. 1 includes a seat cushion 4, a seat back 6, and a headrest 8. Each of these seat components covers a seat frame (4F, 6F, 8F) that forms a seat skeleton, a seat pad (4P, 6P, 8P) that elastically supports an occupant by forming a seat outer shape, and a seat pad. Seat covers (4S, 6S, 8S).
Here, the seat back 6 is connected to the seat cushion 4 so as to be able to be tilted. The headrest 8 is attached to the upper portion of the seat back 6 via a pair of headrest stays 8a (rod-like members).

[Seat frame (first member / second member)]
In this embodiment, the seat frame 6F of the seat back 6 has an upper frame 6a, a pair of side frames 6b, a lower frame 6c, and their related configurations (holder HM, recliner RM) (FIG. 1 to FIG. 1). 3).
Here, the seat frame 6F can be formed of various metals (for example, steel materials such as Hi-Ten 100) that can be integrated by laser welding.
The pair of side frames 6b (an example of the first member) are flat plate members each forming a side skeleton, and have a configuration (a welding portion 10, a starting point portion 12, and a pressing portion 14) described later. Each side frame 6b of the present embodiment has a substantially horizontal U shape (sectional view), and the front end portion and the rear end portion are bent toward the inside of the seat, respectively, with the standing state as a reference. The front end of each side frame 6b is relatively large and bends inward (the first flange portion 6d is formed), and the rear end is relatively large and bends inward (the second flange). Part 6e is formed). These two flange portions 6d and 6e are disposed facing each other with a predetermined gap (clearance into which an upper frame 6a described later can be inserted).

The upper frame 6a (an example of the second member) is a flat plate member (substantially rectangular in front view) that forms an upper skeleton, and can be arranged in a bridging manner between the pair of side frames 6b (see FIG. 3). . The upper frame 6a of the present embodiment has a hat cross-sectional shape, and has a substantially flat surface to be disposed forward with respect to the standing state. In the upper frame 6a, a pair of hole portions H penetrating vertically is provided at an appropriate interval in the sheet width direction. A pair of holders HM (relatively short cylindrical members) are inserted into the holes H of the upper frame 6a, respectively, so that the headrest stay 8a can be inserted.
The lower frame 6c is a flat plate member (substantially rectangular in front view) that forms a lower skeleton, and can be arranged in a bridging manner between the pair of side frames 6b. The lower frame 6c of the present embodiment has a substantially horizontal L shape (sectional view), and the lower portion of the lower frame 6c (projecting portion 6f) is disposed around the operation rod 2r described later while projecting forward of the seat ( (See FIG. 3).

Here, the recliner RM (substantially cylindrical member) is a member that regulates the raising / lowering operation of the seat back 6 with respect to the seat cushion 4, and has an internal configuration (not shown), an operating rod 2r, and a biasing member 4r. (See FIGS. 1-3). The operating rod 2r is a pipe material that is long in the sheet width direction, and the urging member 4r is a spiral spring-like member.
In this embodiment, the recliner RM is rotatably attached to the bracket portion BR of the seat cushion 4 (seat frame 4F) while being fixed to each side frame 6b (lower part). In addition, the operation rod 2r is arranged in a bridging manner between the lower portions of the pair of side frames 6b (the front side of the lower frame 6c). In this state, both end portions of the operating rod 2r are inserted into the recliner RM via the bushes 3r so as to be rotatable around the axis. Next, an urging member 4r is attached to the end (bush 3r) of the operation rod 2r via a fastener 5r, and the operation rod 2r is urged in a direction rotating in one direction.
Then, the operation rod 2r is rotated in the other direction against the urging force of the urging member 4r, and the recliner RM (internal structure) is unlocked. In this way, the seat back 6 can be tilted (rotated) with respect to the seat cushion 4 with the recliner RM as the center of rotation. Further, the operation rod 2r is rotated in one direction by the urging force of the urging member 4r, so that the recliner RM (internal structure) is in a locked state, and the tilting operation of the seat back 6 with respect to the seat cushion 4 is restricted.

[Formation of seat frame]
Referring to FIGS. 3 and 5, a plurality of frames 6 a, 6 b, 6 c are welded and integrated with each other with the seat back 6 standing up as a reference, and related structures are appropriately attached thereto.
In this embodiment, the lower frame 6c is arranged in a bridging manner between the pair of side frames 6b (lower part), and then both frames are welded to be integrated.
Further, the upper frame 6a is disposed between the pair of side frames 6b (upper parts) in a bridging manner, and the end of the upper frame 6a is disposed between the first flange portion 6d and the second flange portion 6e. At this time, both frames are held in this state while the first flange portion 6d (back surface) is disposed facing the end portion of the upper frame 6a (while being disposed at an integrated position).
Then, with the jig 20 (bar material), the first flange portion 6d is pressed against the upper frame 6a side (substantially flat surface disposed forward), and the middle of the first flange portion 6d (welded portion 10 described later) is upper. The surface is brought into contact with the frame 6a. In this state, the first flange portion 6d is integrated with the upper frame 6a by laser welding. With this type of configuration, a relatively large tolerance can be set in the welded portion 10, and the structure of the seat frame 6F is made. It is desirable that it can be formed by stable welding.

(Welded part, starting part, pressing part)
Therefore, in the present embodiment, the first flange portion 6d (side frame 6b) is provided with the starting portion 12 and the pressing portion 14 together with the welded portion 10 (see FIGS. 4 and 5).
The welded portion 10 is a portion that is integrated with the end portion of the upper frame 6a by laser welding, and is formed in the middle of the first flange portion 6d. The welded portion 10 of the present embodiment is inclined linearly in a direction away from the upper frame 6a from the lower side of the seat toward the upper side of the seat. Then, in the state where the upper part of the welded portion 10 is disposed at the position where it is integrated, it is disposed farthest from the upper frame 6a (separation dimension L1).
In this way, by allowing the welded portion 10 to be spaced apart from the upper frame 6a (with a configuration in which surface contact is not required when the welded portion 10 is disposed at an integrated position), a relatively large tolerance can be set for the welded portion 10. It becomes.

The starting point portion 12 is a portion that abuts against the end portion of the upper frame 6a in a state where the starting point portion 12 is disposed at an integrated position. The starting point portion 12 of the present embodiment is a portion bent in a substantially crank shape (sectional view) in a direction approaching the upper frame 6a, and is formed at the lower portion of the first flange portion 6d (below the welded portion 10).
The pressing portion 14 is a portion formed by bending and deforming the upper end portion of the first flange portion 6d (the adjacent position on the upper side of the welding portion 10) in a substantially crank shape (sectional view) in a direction away from the upper frame 6a. Yes, it has a pressing part 14a and a connecting part 14b. The pressing portion 14a is a portion having a concave and convex shape into which the jig 20 can be fitted. The pressing portion 14a is separated from the upper frame 6a with a separation dimension L2 (L2> L1) larger than the welded portion 10 in a state where the pressing portion 14a is arranged at an integrated position. Place them apart. Moreover, the connection site | part 14b is a site | part formed between the pressing site | part 14a and the welding part 10, and it deform | transforms and forms in the direction which leaves | separates gradually from the upper frame 6a as it goes to the pressing site | part 14a from the welding part 10 ( It gradually tilts forward from the bottom toward the front).

In this embodiment, the first flange portion 6d (back surface) is pressed toward the end of the upper frame 6a while pressing the jig 20 into the pressing portion 14 (pressing portion 14a) in a fitting manner (FIGS. 4 and 5). See). The connecting portion 14b is bent and deformed toward the upper frame 6a, so that the pressing portion 14a is pressed against the end of the upper frame 6a.
At this time, in this embodiment, the welded portion 10 is disposed between the pressing portion 14 and the starting point portion 12. For this reason, the welded portion 10 can follow the pressing operation of the pressing portion 14 and can smoothly make surface contact while approaching the end of the upper frame 6a starting from the starting point portion 12. Therefore, the upper frame 6a and the side frame 6b can be integrated by irradiating the side frame 6b with a laser (arrow line indicated by a broken line in FIG. 5B) and welding the upper frame 6a and the welded portion 10. Then, by removing the jig 20 (when not pressed), the connecting portion 14b returns to the original state, so that the pressing portion 14a is arranged away from the upper frame 6a.

In this type of configuration, the vehicle seat 2 may vibrate when the vehicle is moving. At this time, there is a concern that an abnormal sound (such as a hitting sound) is generated when the end side (pressing portion 14a) of the side frame 6b repeats contact and separation with respect to the upper frame 6a.
Therefore, in this embodiment, the pressing portion 14a (the end portion of the side frame 6b) in the non-pressed state is disposed away from the upper frame 6a in a state where the side frame 6b and the upper frame 6a are integrated. By doing so, it is possible to prevent or reduce the occurrence of abnormal noise caused by contact / separation between the pressing portion 14a and the upper frame 6a during vibration of the vehicle seat 2 or the like.

As described above, in this embodiment, the welded portion 10 of the side frame 6b (first member) is at least partially spaced from the upper frame 6a (second member) (with a configuration in which a relatively large tolerance can be set). is there). Then, the seat frame 6F structure can be stably welded by causing the welded portion 10 to follow the pressing operation of the pressing portion 14 and bring it into surface contact with the upper frame 6a.
At this time, in this embodiment, the welded portion 10 can be brought into surface contact with the upper frame 6a more reliably with the starting portion 12 as the starting point. For this reason, in the welded part 10, a larger gap can be allowed as the distance from the starting point part 12 becomes larger (a large tolerance can be set).
Further, in the present embodiment, by arranging the welded portion 10 between the starting point portion 12 and the pressing portion 14, the welded portion 10 can be more reliably brought into surface contact with the upper frame 6 a starting from the starting point portion 12.
In this embodiment, with the side frame 6b and the upper frame 6a integrated, the pressing portion 14a at the time of non-pressing is disposed away from the upper frame 6a. By doing so, it is possible to prevent or reduce the occurrence of abnormal noise caused by contact / separation of the pressing portion 14a (the end of the side frame 6b) and the upper frame 6a during vibration of the vehicle seat 2 or the like.
Therefore, according to the present embodiment, the seat frame 6F structure can be stably welded while enabling a relatively large tolerance to be set in the welded portion 10.

(Modification)
Here, the welded portion can take various shapes (cross-sectional shapes) as long as it can be brought into surface contact with the upper frame 6 a following the pressing operation of the pressing portion 14.
For example, in the first modification, referring to FIG. 6, the welded portion 10 </ b> A is curved in a direction away from the upper frame 6 a toward the upper side of the seat from the starting portion 12 (lower side of the seat) side. Even in this curved welded portion 10A, the seat frame 6F structure can be stably welded and integrated because it can be brought into surface contact with the upper frame 6a by following the pressing operation of the pressing portion 14.

The seat frame structure or the like of the vehicle seat of the present embodiment is not limited to the above-described embodiment, and can take other various embodiments.
(1) In the present embodiment, the side frame 6b is exemplified as the first member. As the first member, any one member of the upper frame 6a, the side frame 6b, and the lower frame 6c can be used.
In the present embodiment, the upper frame 6a is exemplified as the second member. As the second member, any other member (member different from one member) of the upper frame 6a, the side frame 6b, and the lower frame 6c can be used. Examples of the second member include various metal members (a cushion pan for supporting a seat pad, a harness, an armrest, a bracket for attaching an airbag, and the like).
The configurations (shape, dimensions, etc.) of the upper frame, the side frame, and the lower frame can be changed as appropriate according to the seat configuration. A part of these frames can be integrally formed in advance.

(2) Moreover, in this embodiment, although the structure (shape, dimension, arrangement position, etc.) of the welding part 10 (10A), the starting part 12, and the press part 14 was illustrated, it is not the meaning which limits the structure of these each part. . For example, in the present embodiment, an example in which the starting point portion is arranged at a position different from the welded portion has been described. In contrast to this, a part of the welded part can be used as a starting part (a part of the welded part can be brought into surface contact with the second member in a state where the welded part is disposed at an integrated position). In addition, the starting portion can be formed in the middle of the welded portion (the welded portion and the starting portion are formed integrally), and the pressing portions can be formed on both sides of the welded portion 10 respectively. Depending on the sheet configuration, the starting point can be omitted.
In the present embodiment, the example in which the starting point, the welded portion, and the pressing portion are arranged in this order from the lower side of the sheet to the upper side of the sheet has been described. Unlike this, the starting point, the welded portion, and the pressing portion can be arranged in this order from the upper side of the seat toward the lower side of the seat. Further, the starting portion, the welded portion, and the pressing portion can be provided in parallel in the sheet width direction.
In this embodiment, the welded portion and the pressing portion are formed at adjacent positions (continuous). However, as long as the welded portion can follow the pressing operation of the pressing portion, these portions are spaced apart. You can also
In this embodiment, the separation dimension L2 of the pressing part is set to be larger than the separation dimension L1 of the welding part. However, the separation dimension L2 of the pressing part and the separation dimension L1 of the welding part may be the same.
Moreover, in the present Example, although the shape of the press part 14 was illustrated, it is not the meaning which limits the structure of the part. For example, the pressing portion itself can be elastically deformable to the second member side. Moreover, a connection site | part can also be bent and formed in a sheet | seat front side orthogonally from a welding part. Further, in a state where the side frame and the upper frame are integrated, the pressing portion when not pressed can be arranged so as to be in contact with the upper frame.

(3) In the present embodiment, the configuration of the related configuration (holder HM, recliner RM) is exemplified, but the configuration is not intended to be limited. Depending on the sheet configuration, these related configurations can be omitted as appropriate. Note that the configuration of the jig 20 can be changed as appropriate.
(4) In the present embodiment, the seat back 6 has been described as an example, but the configuration of the present embodiment can be applied to various seat components such as the seat cushion 4 and the headrest 8. The configuration of the present embodiment can be applied to various vehicle seats such as vehicles, airplanes, and trains.

2 Vehicle Seat 4 Seat Cushion 6 Seat Back 8 Headrest 6F Seat Frame 6a Upper Frame 6b Side Frame 6c Lower Frame 6d First Flange Part 6e Second Flange Part 10 Welding Part 12 Starting Part 14 Pressing Part 14a Pressing Part 14b Connecting Part 20 Jig HM Holder RM Recliner BM Bracket

Claims (4)

Laser welding is performed while having a metal seat frame that forms a seat skeleton and surface-contacting a weld portion of a first member that forms part of the seat frame to a second metal member that is different from the first member By this, in the seat frame structure of the vehicle seat configured to integrate the first member and the second member,
In a state where the first member is disposed at a position where the first member is integrated with the second member, the weld portion that is at least partially spaced from the second member, and the second member is spaced apart from the weld portion by a separation dimension larger than the second portion. A pressing portion that is spaced apart from the member,
A vehicle seat frame structure in which the welded portion is pressed against the second member while pressing the pressing portion so that the welded portion follows the pressing portion and comes into surface contact with the second member. In a state where the first member is disposed at a position integrated with the second member, the first member is provided at a position different from the pressing portion and has a starting point portion that contacts the second member,
2. The vehicle according to claim 1, wherein the welded portion comes into surface contact while approaching the second member with the starting point as a starting point by pressing against the second member while pressing the pressing portion. Seat frame structure of the seat.   The seat frame structure for a vehicle seat according to claim 2, wherein the welded portion is disposed between the starting point portion and the pressing portion. A metal seat frame forming a skeleton of a vehicle seat including a first member forming a part of a seat frame and a second member different from the first member,
A pressing portion that can be pressed against the second member by pressing, and a welding portion that is adjacent to the pressing portion and is in surface contact with the second member by laser welding; Have
The pressing portion is provided at an end of the first member, and includes a pressing portion that can be pressed against the second member, and a connecting portion that is disposed between the pressing portion and the welded portion. The connecting part is formed in a direction away from the second member as it goes from the welded part to the pressing part,
In the pressing portion at the time of pressing, the pressing portion is pressed against the second member by bending and deforming the connecting portion on the second member side, and in the pressing portion at the time of non-pressing, the connecting portion A seat frame in which the pressing portion is arranged apart from the second member by returning to the original state.

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