JP2020142672A - Vehicle seat and vehicle seat manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a seat spring without caulking. A vehicle seat 10 includes a seat cushion frame 16 having a front frame portion 20 and a rear frame portion 22. The rear frame portion 22 is provided with a rear locked portion 32J. The front frame portion 20 is provided with a front locked portion 30C. Then, the rear end portion 28A of the spring 28 is locked to the rear side locked portion 32J, and the front end portion 28B of the spring 28 is locked to the front side locked portion 30C, so that the spring 28 is locked to the seat cushion frame 16. Can be attached to. In a state where the front end portion 28B of the spring 28 is not locked to the front locked portion 30C, the rear end portion 28A of the spring 28 can be inserted into the rear locked portion 32J in the seat width direction, and the spring 28 can be inserted. In a state where the front end portion 28B is locked to the front locked portion 30C, the rear end portion 28A of the front locked portion 30C cannot escape from the rear locked portion 32J. [Selection diagram] FIG. 13

Description

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

The following Patent Document 1 discloses a vehicle seat on which a vehicle occupant sits. The seat cushion of this vehicle seat includes an upper frame and a crank portion arranged at intervals in the front-rear direction, and a seat spring (spring member) hung between the upper frame and the crank portion. There is. The rear end portion of the seat spring is attached to the crank portion via the rear side spring mounting portion by caulking the rear side spring mounting portion joined to the crank portion. Further, the front end portion of the seat spring is attached to the upper frame by being locked to the front spring attachment portion formed on the upper frame.

Japanese Unexamined Patent Publication No. 2011-63142

By the way, in order to crimp a member for attaching a seat spring, in addition to requiring special equipment and jigs, a processing cost for crimping is required, which increases the manufacturing cost of a vehicle seat. Invite.

In consideration of the above facts, an object of the present invention is to obtain a vehicle seat and a method for manufacturing a vehicle seat to which a seat spring can be attached without caulking.

The vehicle seat according to claim 1 constitutes a skeleton of a seat cushion on which an occupant sits, and is arranged with a pair of left and right side frame portions arranged at intervals in the seat width direction and at intervals in the seat front-rear direction. A seat cushion frame having a front frame portion and a rear frame portion connecting the pair of left and right side frame portions in the seat width direction, and one side of the front frame portion and the rear frame portion are provided from the seat width direction. A first locked portion formed in an annular shape or an annular shape that is partially open when viewed, and the first engaged portion provided on the other side of the front frame portion and the rear frame portion and viewed from the seat width direction. A second locked portion whose side opposite to the stop portion is open, and a first locked portion and a second locked portion that are locked to the first locked portion and the second locked portion, respectively. In a state where the second locking portion is not locked to the second locked portion, the first locking portion can be inserted into the first locked portion in the seat width direction. In a state where the second locking portion is locked to the second locked portion, the first locking portion cannot be pulled out from the first locked portion, and the front frame portion and the rear It is equipped with a seat spring that is hung between the frame and the frame.

According to the vehicle seat according to claim 1, the first locking portion of the seat spring is inserted into the first locked portion provided on one side of the front frame portion and the rear frame portion in the seat width direction. Next, the seat spring is displaced while the first locking portion of the seat spring is inserted into the first locked portion provided on one side of the front frame portion and the rear frame portion, and the second engaging portion of the seat spring is engaged. The stop portion is locked to the second locked portion provided on the other side of the front frame portion and the rear frame portion. As a result, the seat spring is hung between the front frame portion and the rear frame portion. That is, according to the vehicle seat according to claim 1, the seat spring can be attached without caulking.

The vehicle seat according to claim 2 is the vehicle seat according to claim 1, wherein the first locked portion is formed of a plate-shaped member, and the first locking portion is displaced downward to the seat. The lower wall portion that regulates the displacement, the front wall portion and the rear wall portion that regulate the displacement of the first locking portion to the front and rear sides of the seat, and the displacement of the first locking portion to the upper side of the seat are regulated. It is configured to include an upper wall portion, and the lower wall portion and the upper wall portion are offset in the seat width direction.

According to the vehicle seat according to claim 2, the first locked portion is formed of a plate-shaped member. The first locked portion regulates the displacement of the first locking portion of the seat spring to the lower side of the seat and the displacement of the first locking portion to the front and rear sides of the seat. It is configured to include a front and rear wall portion and an upper wall portion that regulates the displacement of the first locking portion to the upper side of the seat. Then, the lower wall portion and the upper wall portion of the first locked portion are offset in the seat width direction. In this way, the lower wall portion and the upper wall portion of the first locked portion are offset in the seat width direction, so that the jig for forming the lower wall portion is provided on the upper wall portion. It is possible to prevent interference or the jig for forming the upper wall portion from interfering with the lower wall portion.

The vehicle seat according to claim 3 is the vehicle seat according to claim 1 or 2, wherein the first locked portion is a portion on the upper side of one of the front frame portion and the rear frame portion. It is formed integrally with the welded joint that is joined by welding.

According to the vehicle seat according to claim 3, when the seat cushion frame is assembled, the seat spring is formed by welding a welded joint to one of the front frame portion and the rear frame portion on the upper side of the seat. 1 The first locked portion to which the locking portion is locked can be easily fixed to one side of the front frame portion and the rear frame portion.

The method for manufacturing a vehicle seat according to claim 4 is applied to the method for manufacturing a vehicle seat according to any one of claims 1 to 3, and the first locking portion is engaged with the first engaging portion. The first locking portion inserting step of inserting the first locking portion into the stop portion in the seat width direction and the second locking portion by displace the seat spring with the first locking portion inserted into the first locked portion. It has a second locking portion locking step of locking the portion to the second locked portion.

According to the method for manufacturing a vehicle seat according to claim 4, the first locking portion of the seat spring is inserted into the first locked portion provided on one side of the front frame portion and the rear frame portion in the seat width direction. (First locking portion insertion step). Next, the seat spring is displaced while the first locking portion of the seat spring is inserted into the first locked portion provided on one side of the front frame portion and the rear frame portion, and the second engaging portion of the seat spring is engaged. The stop portion is locked to the second locked portion provided on the other side of the front frame portion and the rear frame portion (second locking portion locking step). As a result, the seat spring is hung between the front frame portion and the rear frame portion. That is, according to the method for manufacturing a vehicle seat according to claim 4, the seat spring can be attached without caulking.

The vehicle seat and the method for manufacturing a vehicle seat according to the present invention have an excellent effect that the seat spring can be attached without caulking.

It is a perspective view which shows the seat frame of the vehicle seat of this embodiment. It is an enlarged perspective view which shows the part which attached the rear end part of the seat cushion spring in the seat cushion frame in an enlarged manner. It is an enlarged perspective view which shows the part which attached the front end part of the seat cushion spring in the seat cushion frame in an enlarged manner. It is a top view which shows one end of the seat cushion spring. It is a perspective view which shows the rear bracket. It is a top view which shows the rear bracket. It is a front view which shows the rear bracket. It is a side view which shows the rear bracket and the like, and shows typically the state in which the rear end portion of a seat cushion spring is locked. It is a side view which shows the rear bracket and the like, and shows the state in which the rear end portion of a seat cushion spring is inserted into the rear locking portion. It is a side view which shows the rear bracket and the like, and shows the state which the front end part of a seat cushion spring (not shown) is locked to the front side locking part after the rear end part of a seat cushion spring is inserted into a rear side locking part. ing. It is a perspective view which shows typically the process of inserting the 1st locking part. It is a perspective view which shows typically the first half of the 2nd locking part locking process. It is a side view which shows typically the completion state of the 2nd locking part locking process.

The vehicle seat according to the embodiment of the present invention will be described with reference to FIGS. 1 to 13. In the following description, when the front / rear / left / right / up / down directions are shown, the front / rear / left / right / up / down directions as seen from the occupant seated on the vehicle seat shall be indicated, and the arrow FRs appropriately shown in each figure are forward directions. , The arrow UP indicates the upward direction, the arrow RH indicates the right direction, and the arrow LH indicates the left direction. Further, the left-right direction coincides with the seat width direction.

As shown in FIG. 1, the vehicle seat 10 of the present embodiment is used as a rear seat arranged on the rear side of the driver's seat and the passenger's seat. In addition, in FIG. 1, two vehicle seats 10 arranged adjacent to each other in the left-right direction are shown. Further, since the two vehicle seats 10 are symmetrically configured in the left-right direction, the left and right vehicle seats 10 will be described in the following description.

The vehicle seat 10 includes a seat cushion 12 that supports the buttocks and thighs of the occupant, and a seat back 14 that supports the back of the occupant.

The seat cushion 12 is configured by attaching a seat cushion pad (not shown) covered with a skin material to a seat cushion frame 16 constituting the skeleton of the seat cushion 12.

The seat cushion frame 16 is a front frame portion 20 that connects a pair of left and right side frame portions 18 arranged at intervals in the seat width direction and front end portions 18A of the pair of left and right side frame portions 18 in the seat width direction. And a rear frame portion 22 that connects the intermediate portions 18B in the front-rear direction of the pair of left and right side frame portions 18 in the seat width direction.

More specifically, a round pipe-shaped front frame portion 20 is joined by welding to the front end portion 18A of the pair of left and right side frame portions 18. A locking wire 24 for locking a part of the seat cushion pad and a part of the skin material is joined to the front frame portion 20 and the like.

Further, a rear frame portion 22 formed by bending a round pipe-shaped member or the like is joined to the intermediate portion 18B in the front-rear direction of the pair of left and right side frame portions 18 by welding. After this, the rear frame portion 22 has a pair of left and right first extending portions 22A extending from a portion joined to the pair of left and right side frame portions 18 toward the inside in the seat width direction (the center side in the left and right direction of the seat), and left and right. The seat width is a pair of left and right second extending portions 22B extending from the inner end of the pair of first extending portions 22A in the seat width direction toward the rear side, and a pair of left and right second extending portions 22B. It is provided with a third extending portion 22C that connects in the direction. Here, in the present embodiment, the joining position of the first extending portion 22A arranged on the center side of the vehicle (center in the vehicle width direction) to the side frame portion 18 is arranged outside in the vehicle width direction. 1 It is located on the front side of the joining position of the extending portion 22A to the side frame portion 18. Further, the length of the second extending portion 22B arranged on the center side of the vehicle (center in the vehicle width direction) is set longer than the length of the second extending portion 22B arranged outside in the vehicle width direction. ing. As a result, the third extending portion 22C extends parallel to the seat width direction at a position corresponding to the rear end portion 18C of the pair of left and right side frame portions 18.

Further, a seat back frame 26 constituting the skeleton of the seat back 14 is attached to the rear end 18C of the pair of left and right side frame portions 18 so as to be tiltable in the front-rear direction.

As shown in FIGS. 1, 2 and 3, two seat cushion springs 28 as seat springs are hung between the front frame portion 20 and the third extending portion 22C of the rear frame portion 22. ing. In the following description, the "seat cushion spring 28" is simply referred to as a "spring 28".

The spring 28 is formed by repeatedly bending a round bar-shaped member having a wire diameter of D1 so as to meander in the seat width direction. As shown in FIG. 4, the rear end portion 28A (first locking portion) of the spring 28 is centrally engaged with the central locking portion 28C extending substantially parallel to the left-right direction in the central portion in the seat width direction. A retaining curved portion 28D that gently curves from one end of the stopping portion 28C in the seat width direction to the front side is provided. As a result, the dimension L1 from the rear end of the central locking portion 28C to the front end of the retaining curved portion 28D is larger than the wire diameter D1 of the round bar-shaped member forming the spring 28. The "rear end" of the central locking portion 28C and the "front end" of the retaining curved portion 28D are the "rear end" and the "front end" when the spring 28 is attached to the seat cushion frame 16. .. Further, as shown in FIG. 3, the front end portion 28B (second locking portion) of the spring 28 is also formed in the same shape as the rear end portion 28A (see FIG. 4) of the spring 28. Further, the portion of the front end portion 28B of the spring 28 corresponding to the rear end portion 28A is designated by the same reference numerals as the rear end portion 28A.

As shown in FIG. 3, the front end portion 28B of the spring 28 is locked to the front frame portion 20 via the front bracket 30. The front bracket 30 is formed by pressing or bending a steel plate material. The front bracket 30 includes a pair of left and right support plate portions 30A extending in the front-rear direction with the seat width direction as the thickness direction, and a bottom plate portion 30B connecting the lower ends of the pair of left and right support plate portions 30A in the seat width direction. I have. The pair of left and right support plate portions 30A are joined to the lower side of the front frame portion 20 by welding. As a result, the front bracket 30 is fixed to the front frame portion 20. In this embodiment, two front brackets 30 arranged at intervals in the seat width direction are fixed to the front frame portion 20. Further, the front bracket 30 extends from the rear end of the bottom plate portion 30B toward the rear side, and the rear end side is bent toward the front side to form a front side locked portion as a second locked portion. A unit 30C is provided. The front locked portion 30C has a U shape with the front side open when viewed from the seat width direction.

As shown in FIG. 2, the rear end portion 28A of the spring 28 is locked to the third extending portion 22C of the rear frame portion 22 via the rear bracket 32.

As shown in FIGS. 5, 6 and 7, the rear bracket 32 is formed by subjecting the steel plate material to press working, bending, or the like. After this, the rear bracket 32 includes a welded joint 32A curved with a radius of curvature along the upper surface of the third extending portion 22C of the rear frame portion 22, as shown in FIGS. 5, 6 and 8. As shown in FIGS. 6 and 7, projecting portions 32B protruding toward the third extending portion 22C side of the rear frame portion 22 are formed at the left, right, front and rear center portions of the welded joint portion 32A. .. Since the protruding portion 32B is formed, the welded joint portion 32A can be easily joined to the upper surface of the third extending portion 22C of the rear frame portion 22 by projection welding. The left and right ends of the welded joint 32A may be joined to the upper surface of the third extending portion 22C of the rear frame portion 22 by arc welding.

As shown in FIGS. 5, 6 and 8, the rear bracket 32 is a rear wall portion 32C extending downward from the central portion of the front end of the welded joint 32A in the sheet width direction, and the rear wall portion 32C. A lower wall portion 32D curved in a U shape from the lower end to the front side, and a front wall portion 32E extending upward from the front end of the lower wall portion 32D and substantially parallel to the rear wall portion 32C. Is equipped with. In the present embodiment, the dimensions W1 of the rear wall portion 32C, the lower wall portion 32D, and the front wall portion 32E in the sheet width direction are set to be smaller than the dimensions W2 of the welded joint portion 32A in the sheet width direction. .. Further, the rear bracket 32 has a pair of left and right connecting portions 32F protruding from the end in the seat width direction at the upper end portion of the front wall portion 32E toward the right side and the left side, and a pair of left and right connecting portions 32F facing upward. A pair of left and right second front wall portions 32G as extending front wall portions, and a pair of left and right upper walls that bend and extend from the upper ends of the pair of left and right second front wall portions 32G toward the welded joint 32A side (rear side). It is provided with a unit 32H. The ends 32I of the pair of left and right upper wall portions 32H opposite to the second front wall portion 32G are arranged close to the welded joint portion 32A. Here, in the present embodiment, the dimension S of the gap between the end 32I on the opposite side of the second front wall 32G and the welded joint 32A in the pair of left and right upper wall 32H forms the spring 28. It is set smaller than the wire diameter D1 of the round bar-shaped member. Note that in FIGS. 8, 9 and 10, the connection portion 32F is not shown.

Further, when the rear bracket 32 is viewed from the seat width direction, the rear wall portion 32C, the lower wall portion 32D, the front wall portion 32E, the connecting portion 32F, the second front wall portion 32G, and the upper wall portion 32H are first locked. It constitutes an annular rear locked portion 32J in which a part of the portion is opened. By eliminating the gap between the end 32I on the opposite side of the second front wall 32G and the welded joint 32A in the pair of left and right upper wall 32H, the entire circumference of the rear locked portion 32J is covered. It may be configured in a closed ring.

As shown in FIG. 9, when viewed from the seat width direction, the dimension L2 from the lower wall portion 32D to the upper wall portion 32H inside the rear locked portion 32J is after the central locking portion 28C of the spring 28. The dimension is set to be larger than the dimension L1 from the end to the front end of the retaining curved portion 28D. Further, when viewed from the seat width direction, the dimension D2 from the rear wall portion 32C to the front wall portion 32E inside the rear locked portion 32J is the outer diameter D1 of the spring 28 (the wire diameter of the member forming the spring 28). The dimensions correspond to D1) (dimensions slightly larger than the outer diameter D1 of the spring 28). As a result, in a posture in which the spring 28 stands upward (the posture shown in FIG. 9), the rear end portion 28A of the spring 28 is locked on the rear side by moving the spring 28 in the seat width direction. It can be inserted into the portion 32J (the rear end portion 28A of the spring 28 is locked to the rear locked portion 32J). Further, as shown in FIG. 10, with the rear end 28A of the spring 28 inserted into the rear locked portion 32J, the spring 28 is tilted in a direction in which the front end 28B of the spring 28 moves downward. In a state where the front end portion 28B of the spring 28 is locked to the front locked portion 30C (see FIG. 3), the retaining curved portion 28D of the spring 28 and the front wall portion 32E of the rear locked portion 32J are engaged. It becomes a state of overlapping in the seat width direction, and the rear end portion 28A of the spring 28 cannot be pulled out from the rear locked portion 32J. Further, in a state where the front end portion 28B of the spring 28 is locked to the front locked portion 30C (see FIG. 3), the rear end 28A (central locking portion 28C) of the spring 28 is the rear locked portion 32J. It is in contact with the lower wall portion 32D.

(About the process of installing the spring 28)
Next, a step of attaching the spring 28 to the seat cushion frame 16 in the manufacturing process of the vehicle seat 10 of the present embodiment will be described.

First, as shown by the solid line in FIG. 11, the rear end of the spring 28 is moved in the seat width direction to the position indicated by the alternate long and short dash line in a posture in which the spring 28 stands upward. The portion 28A is inserted into the rear locked portion 32J (first locking portion insertion step).

Next, as shown in FIG. 12, with the rear end 28A of the spring 28 inserted into the rear locked portion 32J, the spring 28 is moved in the direction in which the front end 28B of the spring 28 moves downward. Tilt (tilt in the direction of arrow A). Then, as shown in FIG. 13, by pulling the front end portion 28B of the spring 28 forward, the front end portion 28B of the spring 28 is locked to the front locked portion 30C from the front side (front locked portion). Lock from the open end side of 30C to the closed end of the front locked portion 30C). Through the above steps, the spring 28 is attached to the seat cushion frame 16.

As described above, in the vehicle seat 10 of the present embodiment, the spring 28 can be attached to the seat cushion frame 16 without caulking.

Further, in the present embodiment, when the seat cushion frame 16 is assembled, the rear end portion 28A of the spring 28 is engaged by joining the welded joint portion 32A to the upper surface of the third extending portion 22C of the rear frame portion 22 by welding. The rear locked portion 32J to be stopped can be easily fixed to the third extending portion 22C of the rear frame portion 22. In particular, in the present embodiment, since this welding work can be performed from the upper side of the sheet, the workability at the time of the welding is good.

Further, in the present embodiment, as shown in FIGS. 5, 6, 7, and 8, the rear bracket 32 is formed of a plate-shaped member. Then, the rear locked portion 32J of the rear bracket 32 includes a lower wall portion 32D that regulates the displacement of the rear end portion 28A (center locking portion 28C) of the spring 28 to the lower side of the seat and the central locking portion. The front and rear wall portions (front wall portion 32E, second front wall portion 32G and rear wall portion 32C) that regulate the displacement of the 28C to the front and rear sides of the seat and the central locking portion 28C that regulate the displacement to the upper side of the seat are regulated. It is configured to include an upper wall portion 32H. The lower wall portion 32D and the upper wall portion 32H of the rear locked portion 32J are offset in the seat width direction. In this way, the lower wall portion 32D and the upper wall portion 32H of the rear locked portion 32J are offset in the seat width direction, so that the jig for forming the lower wall portion 32D can be formed. It is possible to prevent the jig from interfering with the upper wall portion 32H or the jig for forming the upper wall portion 32H from interfering with the lower wall portion 32D.

Further, in the present embodiment, when the spring 28 is attached to the seat cushion frame 16, the rear end portion 28A (center locking portion 28C) of the spring 28 hits the lower wall portion 32D of the rear locked portion 32J. I'm in contact. In this state, the rear end portion 28A (central locking portion 28C) of the spring 28 and the third extending portion 22C of the rear frame portion 22 are arranged closest to each other. As a result, it is possible to prevent the rear bracket 32 from being deformed when an external force associated with the seating of the occupant on the seat cushion 12 is applied to the spring 28.

The rear bracket 32 and the front bracket 30 may be interchanged in the front-rear direction of the seat, that is, the configuration of the rear bracket 32 may be applied to the front bracket 30, and the configuration of the front bracket 30 may be applied to the rear bracket 32. ..

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be modified in various ways other than the above within a range not deviating from the gist thereof. Of course.

10 Vehicle seat 12 Seat cushion 16 Seat cushion frame 18 Side frame part 20 Front frame part 22 Rear frame part 28 Seat cushion spring 28A Rear end part (first locking part)
28B front end (second locking part)
30C Front locked part (second locked part)
32A Welded joint 32C Rear wall (front and rear wall)
32D Lower wall 32E Front wall (front and rear wall)
32G 2nd front wall (front and rear wall)
32H Upper wall part 32J Rear side locked part (first locked part)

Claims (4)

The skeleton of the seat cushion on which the occupant sits is composed of a pair of left and right side frame portions arranged at intervals in the seat width direction and a pair of left and right side frame portions arranged at intervals in the front-rear direction of the seat. A seat cushion frame having a front frame portion and a rear frame portion connected in the width direction,
A first locked portion provided on one side of the front frame portion and the rear frame portion and formed in an annular shape or an annular shape in which a part is opened when viewed from the seat width direction.
A second locked portion provided on the other side of the front frame portion and the rear frame portion and open on the side opposite to the first locked portion when viewed from the seat width direction.
A first locking portion and a second locking portion that are locked to the first locked portion and the second locked portion are provided, respectively, and the second locking portion is attached to the second locked portion. In the unlocked state, the first locking portion can be inserted into the first locked portion in the seat width direction, and the second locking portion is locked to the second locked portion. In this state, the first locking portion is made unable to escape from the first locked portion, and the seat spring is hung between the front frame portion and the rear frame portion.
Vehicle seat with. The first locked portion is formed of a plate-shaped member, and has a lower wall portion that regulates the displacement of the first locked portion to the lower side of the seat and a front and rear side of the first locked portion. The front and rear wall portions that regulate the displacement of the first locking portion and the upper wall portion that regulates the displacement of the first locking portion toward the upper side of the seat are included.
The vehicle seat according to claim 1, wherein the lower wall portion and the upper wall portion are offset in the seat width direction. The first or second aspect of the present invention, wherein the first locked portion is integrally formed with a welded joint portion to be joined to one of the front frame portion and the rear frame portion on the upper side of the sheet by welding. Vehicle seats. It is applied to the method for manufacturing a vehicle seat according to any one of claims 1 to 3.
A first locking portion insertion step of inserting the first locking portion into the first locked portion in the sheet width direction,
A second locking portion that displaces the seat spring with the first locking portion inserted into the first locked portion to lock the second locking portion to the second locked portion. Locking process and
A method for manufacturing a vehicle seat having.