CN102673455B - Seat backrest frame structure for seat of vehicle - Google Patents

Abstract

The present invention provides a seat back frame structure of a vehicle seat that can realize rigidity enhancement of the seat back frame without increasing the number of parts, complicating the structure, or the like. In the seat back frame structure of a seat for a vehicle, the lower frame (20) has a rear piece (20A) that overlaps left and right ends on the inner surface (10Cb) of the rear flange (10C) extended. The welding position of the lower frame (20) relative to the rear flange (10C) of the side frame (10) is along the inside row of the inner edge of the rear flange (10C) of the side frame (10) and along the rear flange (10C) The inner and outer two rows of the outer row of the free end edge, the upper and lower positions of the welding (A) of the inner row and the welding (B) of the outer row are staggered positions different from each other on the left and right.

Description

Seat back frame structure of vehicle seat

technical field

The present invention relates to a seat back frame structure of a vehicle seat, which is formed by connecting upper and lower parts of left and right side frames with an upper frame and a lower frame, respectively. It is roughly rectangular in front.

Background technique

As a configuration for improving the lateral rigidity and torsional rigidity of a substantially rectangular front seat back frame, Japanese Unexamined Patent Application Publication No. 2000-333769 discloses a configuration in which a cross bar is fixedly installed as a reinforcing member between the rear surfaces of the left and right side frames. The seat back frame described in this gazette is formed into a substantially square frame shape by an upper frame, two side frames, and a lower frame, and a lower reinforcement member and an upper reinforcement member are provided between the two side frames. The lower cross bar and the upper cross bar are formed into substantially U-shaped cross-sections by bending the upper and lower side portions toward opposite sides. In addition, the upper frame and the side frames are integrally formed by the plate frame into a substantially inverted U shape. In addition, recesses are respectively formed in one lower part of the side frames, and the lower rails are fixed to the side frames by bolts and nuts in a state where both ends of the lower rails are respectively fitted in the recesses. Top cross bar also is fixed on the concave part of one side top of both sides frame with bolt 15, nut. In addition, a lower frame made of pipe frames is fixed at the lower ends of the two side frames.

[Patent Document 1] Japanese Patent Laid-Open No. 2000-333769

Contents of the invention

However, in the above-mentioned conventional seat back frame structure of a vehicle seat, the front substantially rectangular seat back frame has a cross bar constituting members other than the lower frame added in order to increase the rigidity. Therefore, as the number of parts increases, , the job project increases. In addition, although the crossbar fits into the recess of the side frame, there will inevitably be a dimensional error between the recess and the cross bar. In addition, the side frame and the end of the cross bar are fixed at one point on one side with bolts and nuts, so the lateral Rigidity tends to deteriorate. In addition, since the lower frame is a pipe, the weight tends to increase, and the configuration may be complicated if it is provided in parallel with the connecting shaft for synchronously connecting the left and right reclining mechanisms.

An object of the present invention is to provide a seat back frame structure for a vehicle seat that can achieve rigidity enhancement of the seat back frame without increasing the number of parts or complicating the structure.

The seat back frame structure of the vehicle seat of the present invention uses the upper frame and the lower frame to connect the upper part and the lower part of the left and right side frames respectively, so that the front is formed into a substantially rectangular shape; it is characterized in that:

The left and right side frames have flanges protruding inwardly of the seat as rear flanges at least at rear end edges of the side frames,

said lower frame comprises a substantially U-shaped section from the front side to the rear side of said side frame,

The left and right ends of the rear panel of the lower frame are arranged to overlap the rear flanges of the side frames,

The welding position of the lower frame with respect to the rear flange of the side frame is an inner row along the inner edge of the rear flange of the side frame and an inner row and an outer row along the free end edge of the rear flange. The upper and lower positions of the welds in the inner row and the welds in the outer row are staggered positions different from each other on the left and right.

In the seat back frame structure of this vehicle seat, the lower frame is formed to include a substantially U-shaped cross-section from the front side to the rear side of the side frame, so the end of the lower frame can be enlarged, and can also serve as a conventional horizontal frame. Therefore, the lateral rigidity and the torsional rigidity are improved, and the increase in the number of parts and the complication of the configuration can be prevented. In addition, the left and right ends of the rear part of the lower frame are arranged so as to be superimposed on the rear flanges of the side frames, and the welding position of the lower frame with respect to the rear flanges of the side frames is the inner row along the inner edge of the rear flanges of the side frames. With the inner and outer two rows of the outer row along the free end edge of the rear flange, the upper and lower positions of the welding of the inner row and the welding of the outer row are staggered positions different from each other on the left and right, so the welding strength is increased, and the lateral direction can be reliably improved. rigidity and torsional rigidity. In addition, since it is not necessary to fit the cross bar into the recess for stabilizing the cross bar as in the past, high machining accuracy is not required, and bolts and nuts are not used, so workability can be improved.

In addition, it is preferable that the front end edge of the lower frame is formed in a bar-shaped protrusion shape (Bide shape).

With such a configuration, it is possible to reliably prevent the pad from being broken at the front end edge of the side frame.

According to the present invention, it is possible to increase the rigidity of the seat back frame without increasing the number of parts, complicating the structure, or the like.

Description of drawings

Fig. 1 is a perspective view showing an embodiment of a seat back frame structure of a reclining chair according to the present invention.

Fig. 2 is a perspective view showing a side frame and a lower frame.

Fig. 3 is a perspective view showing a state in which a lower frame is welded to a side frame.

Fig. 4 is a sectional view along line A-A of Fig. 3 .

Detailed ways

Next, preferred embodiments of the seat back frame structure of the reclining chair of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1 , a recliner chair 1 has a seat back freely tiltable relative to the seat back, a seat cushion forms a seat cushion frame 2 as a skeleton member, and the seat back forms a seat back frame 3 as a skeleton member.

A linear spring 4 for supporting the seat cushion from below is stretched on the cushion frame 2 , and a linear spring 5 for supporting the seat back from the back side is stretched on the seat back frame 3 .

In addition, the lower end of the seat back frame 3 is freely pivotally attached to the pivot shaft 7 erected on the left and right at the rear end of the seat cushion frame 2 , and the seat back frame 3 can be tilted by raising the operating lever 6 .

As shown in FIGS. 2 and 3 , the seat back frame 3 is formed into a substantially rectangular shape when viewed from the front by left and right side frames 10 and an upper frame 11 and a lower frame 20 connecting the upper and lower portions of the left and right side frames 10 .

The side frame 10 is formed into a substantially U-shaped section by a side wall 10A, a front flange 10B, and a rear flange 10C; the side wall 10A has a side surface 10Aa extending in the vertical direction; the front flange 10B has a The rear flange 10C has a rear surface 10Ca extending along the rear end edge of the side wall 10A and protrudes inward.

The lower end portions 10 a of the left and right side frames 10 are bridged by a plate-shaped lower frame 20 also serving as a reinforcing member extending in the horizontal direction. The left and right expansion parts 21 provided on the lower frame 20 protrude forward, and the side end portions 20 a of the lower frame 20 are arranged around the rotation shaft 7 along the outer shape of the lower end portion 10 a of the side wall 10A of the side frame 10 . Then, the expanded portion 21 of the lower frame 20 is configured in a substantially U-shaped cross section from the front surface 10Ba to the rear surface 10Ca of the side frame 10 .

Therefore, the side end portion 20a of the lower frame 20 is enlarged and can also be used as a conventional cross bar, so that the lateral rigidity and torsional rigidity can be improved, and an increase in the number of parts and a complicated configuration can be prevented.

As shown in FIGS. 1 to 4 , left and right end portions 20 a of the lower frame 20 are extended so as to bridge the front flange 10B, side wall 10A, and rear flange 10C of the side frame 10 . With such a configuration, the integration of the lower end portion 10a of the side frame 10 and the lower frame 20 can be improved, and further deformation of the side frame 10 by the lower frame 20 around the rotation shaft 7 can be prevented.

The lower frame 20 has a rear sheet 20A arranged so that the left and right ends overlap on the inner surface 10Cb of the rear flange 10C, and a front sheet 20B which overlaps the left and right ends of the front flange 10B. configuration. Moreover, the center part 20Ba of the front part sheet 20B is formed in a straight shape, and the expansion part 21 of both sides of the front part sheet 20B is formed in a curved shape.

The rear flange 10C is formed wider than the front flange 10B, and the overlapping area becomes larger. In this way, rigidity reinforcement of the seat back frame 3 is achieved.

In addition, the welding position of the lower frame 20 with respect to the rear flange 10C of the side frame 10 is the inner side row along the inner edge of the rear flange 10C of the side frame 10 and the inner and outer sides of the outer row along the free end edge of the rear flange 10C. In each row, the upper and lower positions of weld A in the inner row and weld B in the outer row are staggered positions different from each other on the left and right.

Therefore, the welding strength is increased, and the lateral rigidity and torsional rigidity can be reliably improved, so that the lower frame can also be used as a reinforcing member. In addition, since it is not necessary to fit the cross bar into the recess for stabilizing the cross bar as in the past, high machining accuracy is not required, and bolts and nuts are not used, so workability can be improved.

In addition, the front end edge of the lower frame 20 has a strip-like protrusion shape. Therefore, it is possible to reliably prevent the pad from being broken at the front end edge of the side frame 10 .

Of course, the present invention is not limited to the above-mentioned embodiments. For example, the left and right ends of the front piece 20B of the lower frame 20 extend so as to overlap with the front flange 10B. Therefore, the above-mentioned cross-welding may be performed on the outer surface and the inner surface of the front piece 20B about the overlapped portion.

Explanation of reference signs

1...back chair, 2...seat cushion frame, 3...seat back frame, 7...rotation shaft, 10...side frame, 10A...side wall, 10Aa...side surface, 10B...front flange, 10Ba...front surface, 10C ...rear flange, 10Ca...rear surface, 10a...lower end of side frame, 20...lower frame, 20a...side end of lower frame, 20A...rear piece, 20B...front piece, 21...expanded part, A ...welding, B...welding.

Claims (2)

1. A seat back frame structure of a seat for a vehicle, wherein an upper frame and a lower frame are respectively used to connect the upper part and the lower part of the left and right side frames, thereby forming a roughly rectangular front; it is characterized in that: The left and right side frames have flanges protruding inwardly of the seat as rear flanges at least at rear end edges of the side frames, The lower frame includes expansion parts provided on the left and right sides of the lower frame, and the expansion parts are configured in a substantially U-shaped cross section from the front surface to the rear surface of the side frame, The left and right ends of the rear piece of the lower frame are arranged to overlap with the rear flanges of the side frames, The welding position of the lower frame relative to the rear flange of the side frame is along the inner row of the inner edge of the rear flange of the side frame and along the free end edge of the rear flange In the outer row, which is the inner and outer row, the upper and lower positions of the welding of the inner row and the welding of the outer row are alternate positions different from each other on the left and right. 2 . The seat back frame structure of a vehicle seat according to claim 1 , wherein the front end edge of the lower frame is formed in a strip-shaped protrusion shape. 3 .