JP2011173506A - Cross member structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve proof stress of a cross member to impact force by a side collision. <P>SOLUTION: In this cross member structure, the cross member 12 connected to right and left side sills 8 is formed into a closed cross section shape including a hollow part, and includes inclined upper end parts 35 becoming lower than a center part toward the side sill sides on right and left sides. A bead 36 swelling a wall surface toward a vehicle body front side or a vehicle body rear side is formed on a front wall or a rear wall 25 of the cross member. The bead 36 includes a pair of lateral beads 36a and 36b formed along a vehicle body width direction and arranged at a prescribed interval in a vehicle body vertical direction, and a connecting bead 36c for connecting end parts with each other on vehicle body lateral sides of the pair of lateral beads 36a and 36b in series. The connecting bead 36c is formed along the inclined upper end part 35 in a vehicle body front view. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 In addition, the present invention relates to a cross member structure provided with left and right inclined upper edges that are lower than the central portion toward the side sill.

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. For this reason, it is necessary to reinforce the cross member so that it can withstand the impact force caused by the side collision.
In the conventional cross member structure, a lateral bead is formed on the front wall of the cross member so that the wall surface bulges toward the front of the vehicle body or toward the rear of the vehicle body along one direction of the vehicle body width. It is reinforced so that it can withstand the impact force caused by the protrusion (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2001-247058 (FIG. 4A)

For this reason, when an impact force due to a side collision acts on a portion of the front wall of the cross member where a lateral bead is not formed, the portion where the lateral bead is not formed is likely to be bent and deformed, and the side collision is caused. There is a drawback that the proof strength of the cross member with respect to the impact force tends to decrease.
The present invention has been made in view of the above circumstances, and an object thereof is to improve the resistance of a cross member against an impact force caused by a side collision.

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 has a cross member structure provided with left and right inclined upper edges that are lower than the center portion toward the side sill,
A bead is formed on the front wall or the rear wall of the cross member so that the wall surface bulges toward the front or rear of the vehicle body, and the bead is formed along the vehicle body width direction and the vehicle body vertical direction. A pair of lateral beads arranged at predetermined intervals, and a connection bead for connecting a series of end portions of the pair of lateral beads on the lateral side of the vehicle body, the connection beads being inclined when viewed from the front of the vehicle body It is in the point formed along the upper edge.

With the cross member structure of this configuration, even if an impact force due to a side impact acts on a portion between a pair of lateral beads without additionally providing a reinforcing member, the impact force is transmitted via the connection bead. Thus, it can be distributed and transmitted to the pair of horizontal beads, and deformation such as breakage hardly occurs at a portion between the pair of horizontal beads.
Moreover, since the surface rigidity of the front wall or the rear wall of the cross member is improved by the connection bead, the occurrence of noise and vibration can be prevented.
Further, since the connection bead is formed along the inclined upper edge portion in the front view of the vehicle body, the portion along the inclined upper edge portion of the front wall or the rear wall of the cross member is reinforced to prevent the deformation. Can do.
Therefore, the strength of the cross member against the impact force caused by the 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. It is a perspective view of a reinforcing member. (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. It is a front view of the board | plate material for rear walls which shows 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
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. An 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. 6, 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 the 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 7, 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.

As shown in FIG. 3 (a), a sheet metal reinforcing member 37 having a pair of left and right reinforcing beads 37a formed along the vertical direction of the vehicle body is provided at the center of the rear surface of the front wall 23 in the vehicle width direction. They are joined together by spot welding or the like.
The reinforcing member 37 constitutes an inner support portion 22 b that supports the rear seat 18 via the central seat rail 20.

  As shown in FIG. 5, the reinforcing member 37 includes a reinforcing plate 37b on which a reinforcing bead 37a is formed, an upper flange 37c extending toward the rear of the vehicle body on the upper end side of the reinforcing plate 37b, and a lower end of the reinforcing plate 37b. A lower flange 37d extending toward the front of the vehicle body is integrally provided on the side.

  The reinforcing bead 37a is formed so that the lower end side rises from the lower flange 37d, and the upper end side is formed to open to the upper surface side of the upper flange 37c. The center seat rail 20 is screwed to left and right screw holes 37e formed in the upper flange 37c with the front wall rearward extending plate portion 32 interposed therebetween.

  As shown in FIGS. 6 and 7B, 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 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 rails 19a are formed at both ends of the rear cross member 12 in the vehicle width direction, as shown in FIGS. 3 (b), 6 and 7 (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. 8, the inclined wall 39 has a bent portion 40 with the upper wall 33 and a bent portion 41 with the front wall 23 that are wider than the bent portion 42 between the central upper wall 33 a and the inclined upper wall 33 b. 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.

[Second Embodiment]
FIG. 9 shows another embodiment of the present invention.
In the present embodiment, the connection beads 36c are formed so as to be arranged in a horizontal U shape protruding toward the side of the vehicle body when viewed from the front of the vehicle body.

According to the present embodiment, even if an impact force due to a side collision acts on a portion between the pair of lateral beads 36a and 36b, the impact force is applied to the pair of lateral beads 36a and 36b via the connection bead 36c. In addition, the impact force acting on the portion between the pair of lateral beads 36a and 36b due to a side collision can be transmitted to the pair of lateral beads 36a and 36b via the connecting beads 36c in the vehicle body width direction. The bead 36 is difficult to be deformed.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
1. In the cross member structure according to the present invention, the beads 36 (the horizontal beads 36a and 16b, the connection beads 36c, and the vertical beads 36d) may be press-molded so that the wall faces bulge toward the front of the vehicle body.
2. In the cross member structure according to the present invention, the bead 36 may be formed on the front wall 23 of the cross member 12 by press molding.

A Vehicle body 8 Side sill 12 Cross member 23 Front wall 25 Rear wall 27 Hollow portion 35 Inclined upper edge portion 36 Bead 36a Horizontal bead 36b Horizontal bead 36c Connection bead

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 has a cross member structure provided with right and left inclined upper edges that are lower than the central portion toward the side sill,
A bead is formed on the front wall or the rear wall of the cross member so that the wall surface bulges toward the front or rear of the vehicle body,
A pair of horizontal beads formed along the width direction of the vehicle body and arranged at predetermined intervals in the vertical direction of the vehicle body, and ends of the pair of horizontal beads on the lateral side of the vehicle body are connected in series. With a connection bead,
A cross member structure in which the connection bead is formed along the inclined upper edge in a front view of a vehicle body.

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