JP5458407B2 - Cross member structure - Google Patents

Description

  According to the present invention, a cross member coupled to left and right side sills arranged along the left and right side lower portions of the vehicle body is formed in a closed cross-sectional shape having a hollow portion along the vehicle body width direction, and the cross member is A central upper wall in the vehicle body width direction central portion, and an upper wall provided with an inclined upper wall that is bent and continuous toward the side sill side with respect to each of the left and right sides of the central upper wall, and The present invention relates to a cross member structure having a front wall bent downward with respect to a front edge of an upper wall and having rear seat support portions provided at both ends of the cross member in the vehicle width direction.

The cross member structure is provided so that an impact force caused by a collision from the side of the vehicle body (hereinafter referred to as a side collision) can be dispersed through the cross member.
Further, in the cross member structure, the cross member is arranged on the side of the side sill with respect to each of the central upper wall at the center in the vehicle body width direction and both the left and right sides of the central upper wall so that the rear seat can be easily got on and off. The upper wall is provided with an inclined upper wall that is bent so as to be lower and continuous.
In the conventional cross member structure, the support portion of the rear seat is provided on the upper wall of the cross member (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 7-257435

For this reason, the load from the rear seat acts on the upper wall of the cross member in the vertical direction, and the upper wall easily deforms in the thickness direction.
When the upper wall is easily deformed in the thickness direction, if the impact force caused by the side impact acts on the cross member, the upper wall is further easily deformed, and the proof strength of the cross member against the impact force caused by the side impact is likely to be reduced. There is.
The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it difficult for a cross member to be deformed even if a support portion for a rear seat is provided, and to improve the resistance of the cross member against an impact force caused by a side collision. To do.

The first characteristic configuration of the present invention is that a cross member coupled to left and right side sills arranged along the left and right side lower portions of the vehicle body is formed in a closed cross-sectional shape having a hollow portion along the vehicle body width direction. The cross member includes a central upper wall in the vehicle body width direction central portion, and an inclined upper wall that is bent and continuous so as to be lower toward the side sill side with respect to each of the left and right sides of the central upper wall. A cross member structure having an upper wall and a front wall that is bent downward with respect to the front edge of the upper wall and has a support portion for a rear seat provided at both ends of the cross member in the vehicle width direction. There,
An inclined wall that is bent and continuous with respect to each of the upper wall and the front wall is formed at both ends in the vehicle body width direction of the cross member, and the inclined wall includes a bent portion with the upper wall and the front wall. The bent portion with the wall is formed so as to intersect at the center side in the vehicle width direction with respect to the bent portion between the central upper wall and the inclined upper wall, and the support portion is provided on the inclined wall. .

According to this configuration, the inclined wall provided with the support portion of the rear seat is bent and continuous with respect to the upper wall and the front wall of the cross member at both ends in the vehicle width direction of the cross member. It is easy to secure the bending strength as a panel by narrowing the area of the inclined wall.
In this case, since the rigidity of the inclined wall is sufficient, even if the support portion of the rear seat is provided on the inclined wall, it is not necessary to provide the reinforcing member on the inclined wall, and the number of parts and the production cost can be suppressed.
In addition, since the bent portion with the upper wall of the inclined wall and the bent portion with the front wall intersect each other, it is easy to transmit the impact force due to the side collision to the center portion in the vehicle body width direction.
Further, the bent portion of the inclined wall with the upper wall and the bent portion of the front wall are formed so as to intersect at the center in the vehicle width direction with respect to the bent portion between the central upper wall and the inclined upper wall. The impact force due to the protrusion is difficult to concentrate on the bent portion between the central upper wall and the inclined upper wall, and deformation of the bent portion can also be suppressed.
Therefore, with the cross member structure of this configuration, the cross member is not easily deformed even if the rear seat support portion is provided, and the cross member's resistance to an impact force caused by a side collision can be improved.

It is a schematic side view of a vehicle body. It is a schematic plan view of a vehicle body. (A) is a longitudinal cross-sectional view in the vehicle width direction center part of a cross member structure, (b) is a longitudinal cross-sectional view in the vehicle width direction end part of a cross member structure. (A) is a perspective view of the board material for back walls, (b) is a cross-sectional view of a bead. (A) is an exploded perspective view of a cross member structure, (b) is a perspective view of a cross member structure. (A) is a front view of the board material for rear walls, (b) is a partially cutaway front view of the cross member structure. It is a top view of a cross member structure.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show an automobile having a vehicle body A assembled substantially symmetrically.
The vehicle body A includes a sheet metal body body 2 that forms the passenger compartment 1, a sheet metal body frame 3 that supports the vehicle body 2, and a sheet metal subframe 4 that is supported on the lower front portion of the body frame 3. And.
A pair of left and right front wheels 5 are supported on the subframe 4, and a pair of left and right rear wheels 6 are supported on the rear portion of the vehicle body frame 3.

  The vehicle body frame 3 includes a pair of left and right front side frames 7 extending in the longitudinal direction of the vehicle body, a pair of left and right side sills 8 disposed on the laterally outer sides of the front side frame 7, and rearward from the rear end of each side sill 8. A pair of left and right rear side frames 9 are provided.

  The side sill 8 is disposed between the front wheel 5 and the rear wheel 6 along the left and right lateral sides of the vehicle body A, and the front end of the rear side frame 9 is coupled to the rear end of the side sill 8 by spot welding or the like. Has been.

  A front end cross member 10 that joins the front end portions of the front side frame 7, a left and right front cross member 11 that joins the front-rear direction intermediate portion of the front side frame 7 and the front end portion of the side sill 8, and the rear of the side sill 8 A rear cross member 12 joined to the end portion by spot welding or the like, and a rear end cross member 13 joining the rear end portions of the rear side frame 9 are provided.

  The lower part of the vehicle body 2 has a front floor panel 14 and a rear floor panel 15 arranged in parallel in the vehicle longitudinal direction. The front floor panel 14 and the rear floor panel 15 are placed on the front side frame 7, the rear side frame 9, the front cross member 11, and the rear end cross member 13, and are coupled to each other by spot welding or the like.

  The front floor panel 14 and the rear floor panel 15 are coupled to each other by spot welding or the like via the rear cross member 12, and the left and right side edges are coupled to the inner surface of the side sill 8 by spot welding or the like.

  The vehicle body 2 has a front pillar 2a, a center pillar 2b, and a rear pillar 2c that protrude upward from the left and right sides, and a roof panel 2d is supported by these to form a vehicle interior 1 inside.

  A steering wheel 16 is supported on the front portion of the passenger compartment 1 so as to be steerable, and a pair of left and right front seats 17 and a pair of left and right rear seats 18 are disposed behind the steering wheel 16.

  Each of the rear seats 18 is supported by the vehicle body A via an outer seat rail 19a for each of the left and right rear seats 18 and a central seat rail 20 integrally provided with an inner seat rail 19b for each of the left and right rear seats 18.

  A center portion of the front floor panel 14 in the vehicle body width direction, and a tunnel portion 21 that bulges upward and extends along the vehicle body longitudinal direction is formed at a position between the left and right front seats 17. The rigidity of the front floor panel 14 is increased.

The rear cross member 12 has the cross member structure according to the present invention, and both ends in the vehicle body width direction are joined to the left and right side sills 8 by spot welding or the like.
As shown in FIG. 3, the rear cross member 12 has outer support portions 22 a that support the rear seat 18 via the outer seat rail 19 a at both ends in the vehicle body width direction, and supports the rear seat 18 via the center seat rail 20. A plate-like inner support portion 22b is provided at the center in the vehicle width direction.

The rear cross member 12 includes a front wall plate member 24 constituting a front wall 23 and a rear wall plate member 26 constituting a rear wall 25 joined together by spot welding or the like to form a hollow portion 27 along the vehicle body width direction. Is formed in a substantially parallelogram-shaped closed cross-sectional shape.
In addition, the front wall 23 and the rear wall 25 may be attached in a substantially vertical posture with respect to the front floor panel 14 to enhance the proof stress against the load in the vertical direction.

As shown in FIG. 4, the rear wall plate 26 has a front floor panel 14 extending toward the front of the vehicle body on the lower edge side of the rear wall 25, and a rear wall rearward extending plate portion on the upper edge side of the rear wall 25. 28 extends in a bowl shape toward the rear of the vehicle body.
The front floor panel 14 constitutes the lower wall 29 of the rear cross member 12, and the rear wall rearward extending plate portion 28 is coupled to the rear floor panel 15 by spot welding or the like.

  At the center of the front floor panel 14 in the vehicle body width direction, a downward concave surface portion 30 forming a tunnel portion 21 along the vehicle body longitudinal direction is press-formed so as to open toward the rear of the vehicle body of the rear wall 25.

As shown in FIG. 5, the front wall plate member 24 includes a front extending plate portion 31 extending in a bowl shape toward the front of the vehicle body on the lower edge portion of the front wall 23, and an upper edge portion of the front wall 23. And a front wall rearward extending plate 32 extending in a bowl shape toward the rear of the vehicle body.
The front extending plate portion 31 is coupled to the front floor panel 14 by spot welding or the like.
The front wall rearward extending plate portion 32 constitutes the upper wall 33 of the rear cross member 12 and is coupled to the rear wall rearward extending plate portion 28 by spot welding or the like.

  Each of the front wall 23 and the rear wall 25 has a central upper edge portion 34 substantially parallel to the vehicle body width direction at the vehicle body width direction center portion, and the vehicle body width direction in the vehicle body width direction central portion so as to facilitate getting on and off the rear seat 18. Left and right inclined upper edges 35 that are lower than the central upper edge 34 toward the side sill 8 at both ends are provided.

A bead 36 having a wall surface bulging toward the rear of the vehicle body is formed on the rear wall 25 by press molding.
As shown in FIG. 4B, the cross-sectional shape of the bead 36 is substantially U-shaped or U-shaped in which a pair of side wall portions 38 that rises toward the rear of the vehicle body are connected over substantially the entire length. Alternatively, it is formed in a V shape.

  As shown in FIGS. 4 and 6, the bead 36 includes a pair of horizontal beads 36 a and 36 b formed along the vehicle body width direction and arranged at a predetermined interval in the vehicle body vertical direction, and the pair of horizontal beads. A connecting bead 36c for connecting a series of end portions of the side portions 36a and 36b on the side of the vehicle body and a vertical bead 36d formed in the vehicle body vertical direction along the vehicle body width direction central portion are provided.

Of the pair of lateral beads 36a and 36b, the lower lateral bead 36b is formed symmetrically continuously in series across both sides in the vehicle body width direction, and the upper lateral bead 36a is separated left and right at the center in the vehicle body width direction. And are arranged separately so as to form a pair with each of both end portions of the lower lateral bead 36b.
The connection bead 36c is formed along the inclined upper edge portion 35 in a front view of the vehicle body.

  The vertical bead 36d intersects with the lower horizontal bead 36b so that the lower end rises from the vehicle body rear side end of the downward concave surface portion 30 and the upper end opens to the upper surface of the front wall rearward extending plate portion 32. Is formed.

  The center seat rail 20 is screwed to the plate-like inner support portion 22b with the front wall rearward extending plate portion 32 interposed therebetween.

  As shown in FIGS. 5 and 6B, the upper wall 33 extends toward the rear of the vehicle body along the central upper edge portion 34 of the front wall 23, and the central upper wall 33 a at the center in the vehicle body width direction. And an inclined upper wall 33b extending toward the rear of the vehicle body along the left and right inclined upper edges 35 of the front wall 23.

The inclined upper wall 33b is bent and continuous so as to be lower toward the side sill 8 with respect to the left and right sides of the central upper wall 33a.
Further, the front wall 23 is bent downward and is continuous with respect to the front edge of the upper wall 33.

  The outer support portions 22a that support the rear seat 18 via the outer seat rail 19a are formed at both ends of the rear cross member 12 in the vehicle width direction, as shown in FIGS. 3 (b), 5 and 6 (b). Further, it is provided on an inclined wall 39 which is bent and continuous with respect to the upper wall 33 and the front wall 23.

  As shown in FIG. 7, the inclined wall 39 has a bent portion 40 with the upper wall 33 and a bent portion 41 with the front wall 23 than the bent portion 42 between the central upper wall 33a and the inclined upper wall 33b. It is formed so as to intersect at an intersection B located on the center side in the direction.

  The outer support portion 22a is configured by joining a sheet metal bracket 43 having a screw hole formed on the back surface of the inclined wall 39 by spot welding or the like, and screwing the outer seat rail 19a to the bracket 43. is there.

[Other Embodiments]
1. In the cross member structure according to the present invention, the rear seat mounting bracket 43 may be provided on the upper surface of the inclined wall 39 to constitute the support portion 22 a of the rear seat 18.
2. In the cross member structure according to the present invention, the support portion 22a of the rear seat 18 may be configured by providing a nut or the like on the inclined wall 39 instead of the bracket 43 for attaching the rear seat.
3. In the cross member structure according to the present invention, the outer seat rail 19a may be fixed to the inclined wall 39 by spot welding or the like to constitute the support portion 22a of the rear seat 18.
4). In the cross member structure according to the present invention, support portions that support a rear seat that cannot move in the longitudinal direction of the vehicle body may be provided at both ends of the cross member in the vehicle width direction.
In this case, the rear seat support portion may be configured by fixing the leg portion of the rear seat to the inclined wall by spot welding or the like.

A Car body 8 Side sill 12 Cross member 18 Rear seat 22a Support part 23 Front wall 27 Hollow part 33 Upper wall 33a Central upper wall 33b Inclined upper wall 39 Inclined wall 40 Bent part 41 with upper wall Bent part 42 with front wall Central upper wall And the bent part of the inclined upper wall

Claims (1)

A cross member coupled to left and right side sills arranged along the left and right lateral sides of the vehicle body is formed in a closed cross-sectional shape having a hollow portion along the vehicle body width direction,
The cross member is provided with a central upper wall at the center in the vehicle body width direction and an inclined upper wall that is bent and continuous so as to be lower toward the side sill side with respect to each of the left and right sides of the central upper wall. A wall and a front wall that is bent downward with respect to the front edge of the upper wall and is continuous,
A cross member structure in which rear seat support portions are provided at both ends of the cross member in the vehicle width direction,
Inclined walls that are bent and continuous with respect to each of the upper wall and the front wall are formed at both ends of the cross member in the vehicle body width direction,
The inclined wall is formed such that the bent portion with the upper wall and the bent portion with the front wall intersect at the center in the vehicle width direction with respect to the bent portion between the central upper wall and the inclined upper wall,
A cross member structure in which the support portion is provided on the inclined wall.

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