JP2009142484A - Back spring mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispose a cushion spring and a reinforcing frame at appropriate positions while avoiding such inconvenience as generation of abnormal noise. <P>SOLUTION: The reinforcing frame 20 has a flange part 22 formed by folding at least one edge 22L orthogonally crossing a side frame inward to an occupant seat side F. A resin support 40 is mounted on the occupant side of the flange part 22, and a back spring 30 is fitted into the support 40 and disposed astride the reinforcing frame 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for attaching a back spring to a frame of a vehicle seat.

  As this type of back spring mounting structure, a mounting structure disclosed in Patent Document 1 is known. The metal frame of this attachment structure is composed of a pair of side frames forming a seat back side skeleton and a wire-like reinforcing member disposed in a bridging manner between the pair of side frames. A metal back spring is attached to the frame frame in a bridging manner (in parallel with the reinforcing member) between the lower portions of the pair of side frames.

By the way, in the frame of a vehicle seat, in order to enhance the reinforcing performance of the back frame, a flat reinforcing frame is often provided instead of a wire reinforcing member.
Also, the back spring may be improved in cushioning performance by being arranged parallel to the side frame so as to straddle the reinforcing frame, rather than being arranged in a bridging manner between the pair of side frames. is there.
Thus, in the frame of the vehicle seat, it may be preferable to have a configuration in which the back spring is disposed so as to straddle the reinforcing frame in order to improve the performance.
JP 2006-198129 A

However, in the case of the above-described configuration, every time the occupant leans against the seat back, the back spring comes into contact with the reinforcing frame to generate abnormal noise (metal sound), which may cause discomfort to the occupant.
Therefore, in the frame of the vehicle seat, in consideration of the seating performance of the occupant, the arrangement positions of the back spring and the reinforcing frame may have to be limited to some extent.
The present invention has been made in view of the above points, and the problem to be solved by the present invention is to arrange the back spring and the reinforcing frame at appropriate positions while avoiding inconveniences such as generation of abnormal noise. It is in.

As a means for solving the above-mentioned problems, the back spring mounting structure of the first invention is such that the frame of the vehicle seat has a pair of side frames forming a side skeleton and a bridge between the pair of side frames. A flat reinforcing frame attached in a shape. In order to further enhance the reinforcing performance of the reinforcing frame, the reinforcing frame includes a flange portion in which at least one edge portion which is orthogonal to the side frame is folded inward on the seating side of the occupant.
The back spring is disposed so as to straddle the reinforcing frame (typically in parallel with the side frame) so that the cushion performance of the frame frame is improved. However, with such an arrangement relationship, there is a concern about inconvenience such as generation of abnormal noise due to contact between the back spring and the reinforcing frame (particularly the flange portion).

Therefore, in the present invention, a resin support is attached to the occupant side of the flange portion, and a back spring is fitted to the support so as to straddle the reinforcement frame.
By supporting the back spring with the support (made of resin) provided on the occupant side of the flange portion in this way, a gap is created between the natural frame and the reinforcing frame (which makes it difficult to directly contact the reinforcing frame). Inconveniences such as the generation of abnormal noise due to the contact of the contact are avoided as much as possible.

The back spring mounting structure of the second invention is the back spring mounting structure of the first invention, wherein one side of the back spring is fixed to another frame of the vehicle seat different from the reinforcing frame, and the other side of the back spring is fixed. And it was set as the structure fitted to a support tool so that relative movement with respect to a reinforcement frame was possible.
With such a configuration, even if an excessive load is applied to the back spring due to the seating operation of the occupant, the load can be absorbed by the relative movement of the back spring with respect to the support, so that the back spring is excessively bent. Noise (abnormal noise) is less likely to occur.

The attachment structure of the back spring according to the third invention is the attachment structure of the first invention or the second invention, wherein the above-mentioned support can be fitted into an attachment hole provided on the passenger side of the flange portion and another type It consists of Then, the one mold and the other mold are fitted into the mounting hole in a face-to-face manner with the mounting hole interposed therebetween, and the engaging claw provided on one of the one mold and the other mold is inserted into the engaging hole provided on the other different from the one. It was set as the structure which attaches a support tool to an attachment hole by carrying out fitting assembly | attachment.
And in this invention, the attachment operation | work of a support tool can be simplified more by setting it as the structure assembled | attached, inserting one type and other type of a support tool with respect to an attachment hole.

According to the first aspect of the present invention, it is possible to dispose the reinforcing frame and the back spring at appropriate positions while avoiding inconvenience such as generation of abnormal noise. Further, according to the mounting structure of the second invention, it is possible to more reliably avoid the occurrence of abnormal noise.
And according to the 3rd invention, attachment work of a support tool can be made simpler.

The best mode for carrying out the present invention will be described below with reference to FIGS. In addition, in each figure, the code | symbol F is suitably attached | subjected to the front side of a vehicle seat, and the code | symbol B is attached to the rear side of a vehicle seat.
The vehicle seat 2 of the present embodiment includes a seat back 6 attached to the seat cushion 4 so as to be able to be tilted with reference to FIG. The frame 10 of the seat back 6 is a metal frame having a substantially rectangular shape when viewed from the front, and includes a pair of side frames 12 and 12 forming a side skeleton, and a substantially inverted U-shaped pipe frame 14 forming an upper skeleton. And a lower plate 16 (an example of “another frame”) that forms a lower skeleton.

[Back spring]
In this embodiment, a flat reinforcing plate (also referred to as an upper reinforcement 20 (detailed configuration will be described later)) is arranged in a bridging manner between the upper portions of the pair of side frames 12 and 12, and the occupant is elastically elastic. The back spring 30 for supporting is attached.
Referring to FIG. 1, the back spring 30 is a spring member that is formed by bending a metal wire to have a substantially U shape when viewed from the front. The back spring 30 has a substantially rectangular shape on the side of the connecting end 32 and extends to the left and right. The back spring 30 has a concave bent portion 34 provided at the bottom of the connecting end 32, and a pair of locking portions 18, 18 (longitudinal L-shape of the upper opening). The back spring 30 is configured to be narrow in a crank shape in the middle and wide in a fan shape on the pair of free ends 36 and 36 side.

The back spring 30 is connected in parallel to the pair of side frames 12 and 12 so that the pair of free ends 36 and 36 straddle the upper reinforcement 20 after the connecting end 32 is locked to the lower plate 16. It arranges in. However, in this member arrangement relationship, the upper reinforcement 20 and the back spring 30 (the pair of free ends 36, 36) are likely to come into contact with each other.
Therefore, in this embodiment, an attachment structure is employed in which the back spring 30 can be disposed at an appropriate position while avoiding inconveniences such as generation of abnormal noise by using the support tool 40 described later.

The mounting structure of the present embodiment includes a flange portion 22 provided in the above-described upper reinforcement 20 and a support tool 40 to be described later on which a back spring 30 can be fitted.
[Flange of reinforcing plate]
Referring to FIG. 1, the upper reinforcement 20 (reinforcing plate) has upper and lower edges orthogonal to the side frame 12 on the occupant seating side (seat front side F) in order to further enhance the reinforcing performance. A pair of flange portions 22 and 22 that are internally folded is provided. In the present embodiment, the flange portions 22 are formed continuously at the upper and lower edge portions of the upper reinforcement 20, respectively.
With reference to FIG. 2, the flange portion 22 of the present embodiment is configured to have a concave curved surface shape (concave curved portion 22 </ b> R) on the seat rear side B with respect to the upper reinforcement 20 main body. 22L protrudes from the upper reinforcement 20 main body to the front side F of the seat (inwardly folds on the passenger side). Specifically, the flange portion 22 (edge end 22L) is configured to protrude toward the occupant side by the protruding length dimension T from the surface of the upper reinforcement 20 main body.

A mounting hole 24 into which a support tool 40 to be described later can be fitted is provided through the occupant side (the edge end 22L side) of the flange portion 22 with reference to FIGS. 1 and 2. In the present embodiment, the mounting holes 24 are provided in the upper and lower edges of the flange portion 22 on both the left and right sides of the upper reinforcement 20, corresponding to the positions where the back springs 30 (the pair of free ends 36, 36) are disposed.
The attachment hole 24 has a semi-elliptical shape when viewed from above, and is formed as an inlet portion 26 into which a part of the occupant side edge is cut out and into which the back spring 30 can be fitted. A support tool 40 to be described later is attached to the attachment hole 24. With reference to FIG. 4, the opening dimension W2 of the inlet portion 26 is set to a dimension that is sufficiently wider than the radial dimension W1 of the back spring 30 so as to allow the opening deformation of the opening portion 42 of the support tool 40 described later. ing.

[Support]
The support 40 of the present embodiment is a horseshoe-shaped resin member (typically made of resin such as polyethylene resin or polypropylene resin) with reference to FIG. Has been. Referring to FIG. 4, the opening dimension W3 of the opening 42 is set to be slightly narrower than the diameter dimension W1 of the back spring 30. On the other hand, the opening dimension W4 in the support tool 40 (inner circumference) is slightly wider than the diameter dimension W1 of the back spring 30.
When the support tool 40 is viewed in a vertical cross section (broken line state) in FIG. 3, the cylindrical body portion 44 disposed in the mounting hole 24 described above and a pair of overhang portions that project in the circumferential direction from above and below the body portion 44. 46u, 46d. And the support tool 40 is a structure which can hold | grip the peripheral part of the attachment hole 24 from the thickness direction by a pair of overhang | projection parts 46u and 46d in the state which inserted the trunk | drum 44 in the attachment hole 24. FIG.

(One type and other types)
2 and 3, the support 40 of this embodiment has one mold 50 and another mold 60 (both having a substantially L-shaped vertical cross section) obtained by dividing the body portion 44 into a vertical section when viewed in a vertical section. Shape). The inner peripheral dimension of the mold 50 is set to be slightly wider than the outer peripheral dimension of the other mold 60, and the insertion piece 54 (corresponding to the body portion 44) of the one mold 50 projects radially inward. A claw 52 is provided. On the other hand, the insertion piece 64 (corresponding to the body portion 44) of the other mold 60 is provided with an engagement hole 62 into which the engagement claw 52 of the mold 50 can be inserted.

The support tool 40 is attached to the attachment hole 24 with the opening 42 of the support tool 40 positioned toward the inlet 26 side of the attachment hole 24. At this time, referring to FIG. 3, the one mold 50 and the other mold 60 constituting the support tool 40 are fitted into the mounting hole 24 facing each other with the mounting hole 24 interposed therebetween. Then, the support tool 40 is attached to the attachment hole 24 by fitting and engaging the engagement claw 52 provided in the one mold 50 into the engagement hole 62 provided in the other mold 60.
In this way, by mounting and assembling the mold 50 and the other mold 60 of the support tool 40 into the mounting hole 24, the mounting work of the support tool 40 can be completed with a single touch. It becomes easier.

[Back spring installation work]
Then, referring to FIG. 1, the connecting end 32 side of the back spring 30 is engaged with the lower plate 16 (the pair of locking portions 18, 18). Then, the pair of free ends 36 and 36 are disposed so as to straddle the upper reinforcement 20, and the back spring 30 is disposed in parallel with the pair of side frames 12 and 12.
Next, referring to FIG. 4 and FIG. 5, the back spring 30 (a pair of free ends 36, 36) is pressed against the opening 42 of the support tool 40, and both edges of the opening 42 of the support tool 40 (made of resin). Are pushed while being deformed so as to be separated from each other, and the back spring 30 is fitted into the support 40. After the back spring 30 is inserted into the support tool 40, the opening 42 returns to the original opening dimension W3 (narrower than the diameter dimension W1 of the back spring), so that the back spring 30 can be inserted with good moderation and the back spring 30 is supported. It can be stably attached to the tool 40. Since a slight gap is formed between the inner periphery of the support tool 40 and the back spring 30, the back spring 30 can be fitted to the support tool 40 so as to be movable relative to the upper reinforcement 20.

  As described above, in this embodiment, the back spring 30 is supported by the support 40 (made of resin) provided on the occupant side of the flange portion 22, so that a gap is naturally formed between the back spring 30 and the upper reinforcement 20 body. . For this reason, the back spring 30 (the pair of free ends 36, 36) is less likely to be in direct contact with the upper reinforcement 20, and inconveniences such as generation of abnormal noise due to the contact between both are avoided as much as possible.

Further, in this embodiment, the connecting end 32 side (one side) of the back spring 30 is fixed to the lower plate 16, while the free end 36 side (the other side) is movable relative to the upper reinforcement 20. 40 to be fitted. With such a configuration, when an excessive load is applied to the back spring 30 due to the occupant's seating operation, the load can be absorbed by the relative movement of the back spring 30 with respect to the support tool 40. For this reason, according to the present embodiment, the cushion performance of the vehicle seat 2 is further enhanced, and it is difficult for squeaking noise (abnormal noise) due to excessive bending of the back spring 30 to occur.
Thus, according to the mounting structure of the back spring 30 of the present embodiment, the upper reinforcement 20 and the back spring 30 are placed at appropriate positions so as to improve the performance of the frame 10 while avoiding inconvenience such as the generation of abnormal noise. It can be arranged.

The attachment structure of the back spring of the present embodiment is not limited to the above-described example, and various other embodiments can be taken.
(1) In the present embodiment, the example in which the upper reinforcement 20 is disposed in a bridging manner between the upper portions of the pair of side frames 12 and 12 has been described. In contrast to this, a flat reinforcing plate (lower reinforcement) can be arranged between the pair of side frames 12 and 12 in a bridging manner.
Then, the support tool 40 is attached to a predetermined position of the lower reinforcement, and the connection end 32 side of the back spring 30 is connected to the substantially inverted U-shaped pipe frame 14 (another frame of the seat back different from the reinforcement frame). It is good also as a structure arrange | positioned so that it may straddle lower reinforcement after attaching to "the other example".

(2) Further, in the present embodiment, the example of the back spring 30 in which a metal wire is bent to have a substantially U shape in front view has been described. The back spring can take various shapes corresponding to the shape of the vehicle seat (frame frame), and may be formed of, for example, a linear wire.
In the present embodiment, the back spring 30 has been described as being disposed in parallel on the pair of side frames 12 and 12 so as to straddle the upper reinforcement 20. The position where the back spring 30 is disposed may be inclined with respect to the pair of side frames 12, 12, for example, as long as it extends over the upper reinforcement 20.
Further, both the upper reinforcement and the lower reinforcement may be provided on the frame frame, and a back spring arranged so as to straddle both may be supported by a support attached to each reinforcement.

(3) In the present embodiment, an example in which the flange portions 22 are provided on the upper and lower edges of the upper reinforcement 20 (an example in which the reinforcing performance is further improved) has been described. Unlike this, a simple configuration in which the flange portion 22 is provided on either one of the upper and lower edges of the upper reinforcement 20 may be adopted. The flange portion 22 may have a simple configuration in which the edge end 22L of the upper reinforcement 20 is simply protruded (inwardly folded) toward the occupant's seating side.
Further, in the present embodiment, the example in which the flange portion 22 is continuously formed on the upper and lower edge portions of the upper reinforcement 20 has been described. Unlike this, as long as the strength of the upper reinforcement 20 is ensured, the flange portion may be formed intermittently (for example, only at a position corresponding to the position where the back spring is disposed) in the upper reinforcement 20.
(4) Further, in the present embodiment, the description has been made of the support 40 having a concave shape in the longitudinal section (a bent concave shape formed by assembling the L-shaped mold 50 and the other mold 60). The vertical cross-sectional shape of the support tool 40 may take other shapes as long as it can be fitted into the mounting hole 24, and may be, for example, a horizontal U-shaped vertical cross-section.
Furthermore, in this embodiment, the support tool 40 formed by assembling the one mold 50 and the other mold 60 is used. Alternatively, a support tool 40 (integrated support tool 40) in which the body portion 44 and the pair of overhang portions 46u and 46d are integrated may be used. In this case, the integrally configured support tool 40 is inserted from the inlet portion 26 of the mounting hole 24 from the front-rear direction of the seat.
(5) Moreover, in the present Example, the example of the support tool 40 of the upper view substantially horseshoe shape was demonstrated. The top view shape of the support tool 40 may be a polygonal shape such as a triangle or a square corresponding to the cross-sectional shape of the back spring 30.
(6) In the present embodiment, the example in which the back spring 30 is fitted to the support 40 so as to be relatively movable with respect to the upper reinforcement 20 has been described. Unlike this, the back spring 30 may be fitted to the support 40 so as not to move relative to the upper reinforcement 20. In this case, the opening dimension W4 in the support tool 40 (inner circumference) is set to be substantially the same as the diameter dimension W1 of the back spring 30 (zero gap setting). By doing so, the back spring 30 can be stably disposed on the frame 10.

It is a perspective view of a vehicle seat. It is a disassembled perspective view of an attachment structure. It is a longitudinal cross-sectional view of a resin clip and a flange part. It is an upper front view of an attachment structure. It is an expansion perspective view of a part of reinforcing plate.

Explanation of symbols

2 Vehicle seat 10 Seat back frame 12 Side frame 20 Upper reinforcement (reinforcement frame)
22 Flange portion 24 Mounting hole 26 Entrance portion 30 Back spring 40 Support tool 50 One mold 52 Engaging claw 60 Other mold 62 Engaging hole

Claims (3)

An occupant is elastically supported with respect to a frame frame of a vehicle seat including a pair of side frames forming a side skeleton and a flat reinforcing frame disposed in a bridging manner between the pair of side frames. In the mounting structure of the back spring for mounting the back spring,
The reinforcing frame includes a flange portion formed by folding at least one edge portion orthogonal to the side frame on the seating side of the occupant,
A back spring mounting structure in which a resin support is attached to an occupant side of the flange portion, and the back spring is fitted to the support so as to straddle the reinforcing frame. While fixing one side of the back spring to another frame of the vehicle seat different from the reinforcing frame,
The back spring mounting structure according to claim 1, wherein the other side of the back spring is configured to be fitted to the support so as to be movable relative to the reinforcing frame. The support is composed of one type and another type that can be fitted into a mounting hole provided on the passenger side of the flange portion,
The one mold and the other mold are fitted into the mounting hole in a face-to-face manner with the mounting hole in between, and an engaging claw provided on one of the one mold and the other mold is provided on the other side different from the one. A back spring mounting structure in which the support member is mounted to the mounting hole by being fitted and assembled into the engaging hole.

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