JP2008087578A - Seat frame for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat frame for a vehicle, which seat frame can improve the stiffness for a load in the direction of a seat width without increasing the number of components. <P>SOLUTION: A pair of lower arms 13 arranged on both sides in the direction of the seat width and a cushion panel 14 for connecting both of the lower arms on the front side of the seat are joined. The cushion panel has a recessed portion 21 extending in the direction of the seat width at the intermediate position of the forward and backward direction of the seat. A pair of the lower arms have engaging portions 22 to be engaged with side wall portions 21a formed on both sides of the recessed portion in the direction of the seat width respectively. The cushion panel and the respective lower arms are joined at the side wall portions and the engaging portions. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat frame that forms a skeleton of a seat cushion.

Conventionally, for example, a vehicle seat frame described in Patent Document 1 includes a pair of lower arms (16-1) disposed on both sides in the seat width direction and a cushion panel (18-1) that connects the lower arms on the front side of the seat. ). When assembling the vehicle seat frame, the lower arm and the cushion panel are fastened together with the set screw (20) with respect to the lower hole (12) provided in the lower arm via the hole (14) provided in the cushion panel. The temporary holding of the assembled shape is performed under the temporary fixing of the cushion panel to the lower arm. Thereafter, the vehicle seat frame is fixed in its completed shape under the integral joint between the lower arm and the cushion panel by welding (28). This simplifies the structure of the vehicle seat frame and its assembly.
JP 2004-359186 A JP 2000-309239 A

  By the way, in patent document 1, since it is the structure which joins a cushion panel along the upper flange of a lower arm by welding, the rigidity of the vehicle seat frame with respect to the load of a horizontal direction (seat width direction), such as at the time of vehicle side collision, for example The contribution of the cushion panel is small with respect to the improvement of.

  On the other hand, the vehicle seat frame described in Patent Document 2 includes a pair of lower arms (10) disposed on both sides in the seat width direction, and a cushion panel (2) for connecting the lower arms on the front side of the seat. Composed. The pair of rail members (21) connected to each lower arm is provided with an intermediate connecting member (76) for connecting the rail members at the intermediate portion in the front-rear direction of the seat. Indirect improvement of the rigidity of the vehicle seat frame with respect to the load is achieved.

However, in Patent Document 2, the need for a reinforcing intermediate connecting member in addition to the cushion panel increases the number of parts, which in turn increases the manufacturing cost.
An object of the present invention is to provide a vehicle seat frame capable of improving rigidity against a load in the seat width direction without increasing the number of parts.

  In order to solve the above problems, the invention according to claim 1 is a vehicle in which a pair of lower arms arranged on both sides in the seat width direction and a cushion panel connecting the lower arms on the front side of the seat are joined. In the seat frame, the cushion panel has a recess extending in the seat width direction at an intermediate portion in the seat front-rear direction, and the pair of lower arms has contact portions that contact the side wall portions on both sides of the recess in the seat width direction. And the cushion panel and each lower arm are joined at the side wall and the contact portion.

  According to this configuration, the cushion panel and the lower arms are directly joined at the side wall portion and the contact portion on each side of the recess in the seat width direction, so that no gap is generated in the seat width direction. Solidly integrated. Therefore, the rigidity against the load in the sheet width direction can be improved. In addition, since the structure can be basically realized only by changing the shape of existing members (lower arm, cushion panel), an increase in the number of parts can be avoided.

  According to a second aspect of the present invention, in the vehicle seat frame according to the first aspect, each of the lower arms has a first flange that protrudes in the seat width direction continuously to the upper end, and the cushion panel has an upper end. The lower flange and the cushion panel are arranged on both sides where the concave portion is disposed in the middle in the seat front-rear direction, and the second flange is placed on the first flange. The gist is that they are joined at the first and second flanges.

  According to the same configuration, the cushion panel and the lower arms are joined together at two locations on both sides where the concave portion is arranged in the seat longitudinal direction in the first and second flanges as a whole. Stiffness can be improved.

  According to a third aspect of the present invention, in the vehicle seat frame according to the first or second aspect, the projecting piece projecting in the seat width direction from either the side wall portion or the contact portion, and the side wall And a guide hole into which the projecting piece is inserted.

  According to this configuration, the pair of lower arms and the cushion panel are roughly integrated by temporary assembly by inserting the protruding pieces into the guide holes. Therefore, it is possible to smoothly perform the joining at the side wall portion and the contact portion by utilizing this temporarily assembled state.

  According to a fourth aspect of the present invention, there is provided a vehicle seat frame in which a pair of lower arms disposed on both sides in the seat width direction and a cushion panel connecting the lower arms on the front side of the seat are joined. The present invention is characterized in that a recess extending in the seat width direction is provided at an intermediate portion in the seat front-rear direction, and the pair of lower arms respectively have contact portions that come into contact with side wall portions on both sides in the seat width direction of the recess.

  According to this configuration, the cushion panel and the lower arms are in contact with each other at the side wall portion and the contact portion on each side of the concave portion in the seat width direction, so that a solid gap is not generated in the seat width direction. Integrated into Therefore, the rigidity against the load in the sheet width direction can be improved. In addition, since the structure can be basically realized only by changing the shape of existing members (lower arm, cushion panel), an increase in the number of parts can be avoided.

  A fifth aspect of the present invention is the vehicle seat frame according to the fourth aspect, wherein the cushion panel and each lower arm are joined at the side wall portion and the contact portion.

  According to this configuration, the cushion panel and the lower arms are directly joined at the side wall portion and the contact portion on each side of the recess in the seat width direction, so that no gap is generated in the seat width direction. Solidly integrated. Therefore, the rigidity against the load in the sheet width direction can be improved.

  According to the first to fifth aspects of the invention, it is possible to provide a vehicle seat frame capable of improving the rigidity against a load in the seat width direction without increasing the number of parts.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a skeleton part of a seat (vehicle seat) mounted on a vehicle such as an automobile. As shown in the figure, the pair of lower rails 11 disposed on both sides in the seat width direction are fixed so as to extend in the front-rear direction with respect to a vehicle floor (not shown). And the upper rail 12 which makes a pair in the seat width direction is attached to the upper side of each lower rail 11 so that sliding is possible in the front-back direction.

  On the upper part of each upper rail 12, a lower arm 13 made of a plate material paired in the seat width direction is supported. The front end portions of the lower arms 13 are connected via a cushion panel 14 made of a plate material extending in the seat width direction. Further, the rear end portions of the lower arms 13 are connected via a cylindrical connecting member 15 whose axis extends in the seat width direction. The pair of lower arms 13, the cushion panel 14, and the connecting member 15 form a rectangular frame that opens in the vertical direction, and constitutes the vehicle seat frame according to the present embodiment that forms a skeleton of the seat cushion.

  A seat back frame F is supported at the rear ends of the lower arms 13 so as to be tiltable about the rotation axis O, and the inclination angle of the seat back frame F is a known angle provided to each lower arm 13. It is selectively held by the locking device L.

  Next, the joining mode of the pair of lower arms 13 and the cushion panel 14 will be described with reference to FIGS. 2 is a plan view showing the vehicle seat frame, and FIGS. 3 and 4 are cross-sectional views taken along lines AA and BB in FIG. 2, respectively.

  As shown in FIG. 4, each of the lower arms 13 has a main body portion 13a standing up and down, bent from the upper end of the main body portion 13a to the outer side in the sheet width direction, and further folded back to the inner side in the sheet width direction. Part 13b. In addition, the front-end | tip part of the folding | turning part 13b forms the 1st flange 13c which protrudes inside a sheet | seat width direction.

  As shown in FIGS. 1 to 3, the cushion panel 14 includes a bottom plate portion 14 a, a pair of side plate portions 14 b that stand obliquely upward continuously at both ends of the bottom plate portion 14 a in the seat width direction, and the bottom plate portion. A front plate portion 14c that rises obliquely upward and continues to the front end of 14a and connects both side plate portions 14b is formed integrally with a square tray. Further, the cushion panel 14 has a recess 21 extending in the seat width direction at an intermediate portion in the seat front-rear direction. The concave portion 21 is recessed further downward than the bottom plate portion 14a, and the outer shape in plan view is rectangular (see FIG. 2).

  As shown in FIG. 4, the side wall portion 21a on each side in the sheet width direction of the concave portion 21 abuts on the abutting portion 22 of the lower arm 13 formed by the opposing surface of the main body portion 13a. The cushion panel 14 and the lower arms 13 are joined by welding 23 at the side wall 21a and the contact portion 22. In each figure, the welding location is marked with a cross to clearly indicate its arrangement.

  The cushion panel 14 has a second flange 24 bent so as to protrude outward in the seat width direction continuously to the upper ends of the side plate portions 14b and the side wall portions 21a. The second flange 24 is placed on the first flange 13c. As shown in FIG. 3, the lower arms 13 and the cushion panel 14 are welded to the first and second flanges 13 c and 24 by welding 25 on both sides where the concave portion 21 is disposed in the seat longitudinal direction. It is joined.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, the cushion panel 14 and the lower arms 13 are in contact with each other at the side wall portion 21a and the contact portion 22 on each side of the recess 21 in the seat width direction, and are directly welded 23. By being joined, it is firmly integrated without generating a gap in the sheet width direction. Therefore, the rigidity against the load in the sheet width direction can be improved. In addition, since the structure is basically realized only by changing the shape of the existing members (lower arm 13 and cushion panel 14), an increase in the number of parts can be avoided.

  (2) In the present embodiment, the cushion panel 14 and the lower arms 13 are also combined at two locations on both sides where the concave portion 21 is arranged in the seat longitudinal direction in the first and second flanges 13c and 24. By joining by welding 25, the rigidity as a whole can be improved.

In addition, you may change the said embodiment as follows.
As shown in FIGS. 5 and 6, the side wall 21a of the recess 21 is formed with a protruding piece 31 protruding in the sheet width direction by, for example, cutting, and the abutting portion of the lower arm 13 A guide hole 32 into which the projecting piece 31 is inserted may be formed in 22 so as to face the projecting piece 31 by, for example, punching. In this case, the pair of lower arms 13 and the cushion panel 14 are roughly integrated by temporary assembly by inserting the protruding pieces 31 into the guide holes 32. Therefore, by using this temporarily assembled state, it is possible to smoothly join the side wall portion 21a and the contact portion 22 by welding 23.

In addition, a projecting piece may be formed on the contact portion 22 of the lower arm 13, while a guide hole into which the projecting piece 31 is inserted may be formed on the side wall portion 21 a of the recess 21.
In the embodiment, the arrangement relationship of the welds 23 and 25 is an example. Further, if sufficient rigidity is obtained as a whole, the welding 25 may be omitted.

  In the above-described embodiment, the weldings 23 and 25 are generally made by a technique such as arc welding or spot welding.

The perspective view which shows one Embodiment of this invention. The top view which shows the same embodiment. Sectional drawing along the AA line of FIG. Sectional drawing along the BB line of FIG. The disassembled perspective view which shows the deformation | transformation form of this invention. Sectional drawing which shows the modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 13 ... Lower arm, 13c ... 1st flange, 14 ... Cushion panel, 21 ... Recessed part, 21a ... Side wall part, 22 ... Contact part, 23, 25 ... Welding, 24 ... 2nd flange, 31 ... Projection piece, 32 ... Guide Hole.

Claims (5)

In a vehicle seat frame formed by joining a pair of lower arms disposed on both sides in the seat width direction and a cushion panel connecting the lower arms on the front side of the seat,
The cushion panel has a recess extending in the seat width direction in the seat front-rear direction intermediate portion,
Each of the pair of lower arms has an abutment portion that abuts against the side wall portions on both sides of the recess in the sheet width direction,
The vehicle seat frame, wherein the cushion panel and each lower arm are joined at the side wall portion and the contact portion. The vehicle seat frame according to claim 1,
Each of the lower arms has a first flange projecting in the seat width direction continuously from the upper end,
The cushion panel has a second flange that protrudes in the seat width direction continuously from the upper end and is placed on the first flange,
Each of the lower arms and the cushion panel are joined at the first and second flanges on both sides where the concave portion is disposed in the middle in the seat front-rear direction. The vehicle seat frame according to claim 1 or 2,
A projecting piece projecting in the sheet width direction from either one of the side wall part and the contact part;
A vehicle seat frame comprising: a guide hole formed in one of the side wall portion and the contact portion and into which the protruding piece is inserted. In a vehicle seat frame formed by joining a pair of lower arms disposed on both sides in the seat width direction and a cushion panel connecting the lower arms on the front side of the seat,
The cushion panel has a recess extending in the seat width direction in the seat front-rear direction intermediate portion,
The pair of lower arms includes a contact portion that contacts the side wall portions on both sides in the seat width direction of the recess, respectively.   The vehicle seat frame according to claim 4, wherein the cushion panel and each lower arm are joined at the side wall portion and the contact portion.

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