JP6472021B2 - Lower body structure of automobile - Google Patents

Description

  The present invention relates to a lower body structure of an automobile in which a front end portion of a trailing arm is swingably supported by support brackets attached to left and right rear side members.

  In an automobile, for example, in FIG. 1 of Patent Document 1, a closed cross-section is formed by projecting to a rocker inner 5 below a side member 4 from the viewpoint of increasing the rigidity of the lower vehicle body with respect to input from a rear wheel during traveling. And a bulkhead 26 for connecting the mounting seat 22 of the suspension bracket 2 and the overhanging portion 51, and the bush 10 of the trailing arm 1 is interposed between the overhanging portion 51 and the mounting seat 22. Arranged structures are disclosed.

JP 2000-153778 A

  By the way, in the said conventional structure, since it is a structure which receives the front-back direction input and the vehicle width direction input only with a suspension bracket, sufficient rigidity may not be obtained depending on the input. For this reason, there is a possibility that the suspension bracket may be deformed, and there is a concern that the ride comfort and the steering stability are deteriorated.

  The present invention has been made in view of the above-described conventional situation, and provides a lower vehicle body structure of an automobile that can improve ride comfort and steering stability by increasing rigidity of the lower vehicle body with respect to input from a rear wheel. It is an issue.

The present invention relates to a lower body of an automobile having left and right rear side members extending in the vehicle front-rear direction and a support bracket attached to the left and right rear side members and supporting a front end portion of a trailing arm so as to be swingable. In structure
An upper wall portion coupled to the lower surface of the rear side member, the left and right support brackets; an inner and outer wall portion extending in a downward direction from the upper wall portion and supporting the trailing arm; It has a front wall part that connects the front ends of the inner and outer wall parts,
A coupling member extending forward and coupled to the rear side member in the vehicle width direction is disposed on the left and right support brackets, and the coupling member forms a closed cross section with the support bracket and the rear side member. In addition, it has a contact portion that contacts the front wall portion of the support bracket in the vehicle front-rear direction.

  According to the lower vehicle body structure of the present invention, the coupling member extending forward is disposed on the left and right support brackets, and the coupling member, the support bracket and the rear side member form a closed cross section, and the coupling member Since the abutting portion that abuts in the vehicle front-rear direction is formed on the front wall portion of the support bracket, the input of the front-rear direction from the rear wheel during vehicle travel is caused by the coupling member to be stretched back and forth between the support bracket and the rear side member. Thus, it is transmitted from the front wall portion of the support bracket to the rear side member via the contact portion of the coupling member.

In the present invention, since the coupling member is coupled to the rear side member in the vehicle width direction, the vehicle width direction input during turning of the vehicle is efficiently transmitted from the support bracket to the rear side member via the coupling member.

  As described above, in the present invention, the longitudinal direction input and the vehicle width direction input from the rear wheel are transmitted from the support bracket to the rear side member via the coupling member. The rigidity of the vehicle can be increased, which in turn improves ride comfort and handling stability.

It is a bottom view of the lower car body of the car by Example 1 of the present invention. FIG. 2 is a sectional view of the lower vehicle body (sectional view taken along line II-II in FIG. 1). It is the perspective view seen from the diagonally lower part of the said lower vehicle body. It is a side view of the said lower vehicle body. FIG. 5 is a cross-sectional view of the lower vehicle body (a cross-sectional view taken along line V-V in FIG. 4). FIG. 5 is a sectional view of the lower vehicle body (sectional view taken along line VI-VI in FIG. 4).

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 6 are views for explaining a lower body structure of an automobile according to a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a lower body of an automobile. The lower vehicle body 1 includes left and right rear side members 2 and 2 extending in the vehicle front-rear direction, support brackets 3 and 3 disposed on the left and right rear side members 2, and the left and right rear side members 2 respectively. Rocker panels 4, 4 disposed on the vehicle exterior side, and a rear floor panel 5 disposed between the rocker panels 4 on the upper surfaces of the left and right rear side members 2.
A rear cross member 6 extending in the vehicle width direction is coupled between the front end portions of the left and right rear side members 2, and the rear end portions of the left and right front side members 7, 7 are connected to the rear cross member 6. Is connected.

The rear side member 2 has a generally hat-shaped cross section that opens upward, a kick-up portion 2a that extends obliquely rearward and upward from a joint portion with the rear cross member 6, and a rear side following the kick-up portion 2a. And a horizontal portion 2b extending substantially horizontally. A rocker inner 4 a of the rocker panel 4 is coupled to the outer wall 2 c of the rear side member 2.

  A fuel tank 9 is disposed between the kick-ups 2 a of the left and right rear side members 2. The fuel tank 9 is disposed at a position displaced from the vehicle center to one side in the vehicle width direction.

  A rear suspension 10 is disposed below the left and right rear side members 2. As shown in FIG. 2, the rear suspension 10 supports a bush 13 fixed to the front end portion of the trailing arm 12 by the support bracket 3, and connects the rear wheel 11 to the rear end portion of the trailing arm 12. The coil spring 14 is disposed between the trailing arm 12 and the rear side member 2, and the shock absorber 15 is disposed between the rear wheel 11 and the rear side member 2.

  The left and right support brackets 3 are bent downward following the upper wall 3a coupled to the bottom surface of the bottom wall 22e of the kick-up 2a of the rear side member 2, and the left and right edges of the upper wall 3a. The inner and outer wall portions 3b and 3b 'extending in the direction and the front wall portion 3c for connecting the front edges of the inner and outer wall portions 3b and 3b' are integrally formed. 3d is a flange portion to which a rear end portion of a stay (not shown) whose front end portion is fastened to the front side member 7 is attached.

  A coupling member 20 described later is overlaid on the inner wall 3b of the support bracket 3, and the rocker inner 4a is overlaid on the outer wall 3b '. The bush 13 is disposed between the inner and outer wall portions 3b and 3b 'of the support bracket 3, and the bush 13 has the support shaft 13a inserted in the shaft core portion of the bush 13 and the inner wall portion 3b. And the coupling member 20 and the overlapped portion between the outer wall 3b 'and the rocker inner 4a are fastened (see FIG. 6).

  Between the left and right support brackets 3, a connecting bar 18 extending in a substantially linear shape in the vehicle width direction is disposed (see FIGS. 1 and 2). The connecting bar 18 includes a linear main body portion 18a made of a pipe material, and flat plate portions 18b and 18b that are bent and formed inside the vehicle by pressing both ends of the main body portion 18a with a press or the like.

  The left and right flat plate portions 18b of the connection bar 18 are bolted and fixed to the inner side wall portion 3b of the support bracket 3, whereby the left and right support brackets 3 are integrally connected by the connection bar 18. ing.

Further, when viewed from the side of the vehicle, the connecting bar 18 is disposed so as to extend obliquely downward from the flat plate portion 18 b and then pass under the rear end portion 9 a of the fuel tank 9. This prevents the fuel tank 9 from being deformed by an external force from below and behind the vehicle while avoiding interference with the fuel tank 9.

  The left and right support brackets 3 are provided with the coupling member 20 extending from the support bracket 3 to the front of the vehicle. The coupling member 20 includes a coupling plate portion 20a that is opposed to the bottom wall 2e of the rear side member 2 with a predetermined gap, an inner flange portion 20b that is bent and extends upward following the inner edge of the coupling plate portion 20a, And an outer flange portion 20c that bends and extends downward following the outer edge.

  The inner flange portion 20b of the coupling member 20 is joined to the inner wall 2d of the rear side member 2 by welding in the vehicle width direction, and the outer flange portion 20c is welded to the rocker inner 4a of the rocker panel 4 by welding. Combined in direction.

Further, the coupling plate portion 20a of the coupling member 20 is formed so as to be substantially horizontal with respect to the front and lower slope of the kick-up 2a, and the front flange portion 20d of the coupling plate portion 20a is formed on the rear side member 2. The bottom wall 2e is connected to the lower surface in the vertical direction by welding.

As a result, the connecting member 20 forms a closed section A having a substantially triangular shape in a side view by the support bracket 3, the rear side member 2, and the rocker inner 4a.

  The coupling member 20 has an expanded portion 20e that extends rearward while expanding in the vertical direction following the inner flange portion 20b. A plurality of bead portions 20f extending in the vertical direction are formed in the expanded portion 20e.

The expanded portion 20 e has a size that covers substantially the entire vertical direction of the inner wall 2 d of the rear side member 2 and the inner wall 3 b of the support bracket 3. The upper portion of the expanded portion 20e is coupled to the inner wall 2d, and the lower portion is fastened and fixed to the inner wall 3b via the support shaft 13a of the bush 13.

  The coupling plate portion 20a has a contact portion 20f that bends and extends downward following the rear edge of the coupling plate portion 20a (see FIGS. 2 and 3). The contact portion 20f is in contact with the front wall portion 3c of the support bracket 3 in the vehicle front-rear direction, and is joined to the front wall portion 3c in the front-rear direction by welding.

  According to this embodiment, the coupling member 20 extending forward is disposed on the support bracket 3 coupled to the lower surfaces of the left and right rear side members 2, and the coupling member 20, the support bracket 3, the rear side member 2, and the rocker inner 4a. And the contact portion 20g of the coupling member 20 is coupled to the front wall portion 3c of the support bracket 3 in the vehicle front-rear direction. The input F from the trailing arm 12 is received when the coupling member 20 is stretched between the support bracket 3 and the rear side member 2. As a result, the input F can be efficiently transmitted from the front wall portion 3c of the support bracket 3 to the rear side member 2 through the contact portion 20g of the coupling member 20, and the conventional suspension bracket alone receives the input. Compared to the above, the rigidity of the lower body can be increased, and as a result, the ride comfort and steering stability during vehicle acceleration / deceleration can be improved.

  In this embodiment, the inner flange portion 20b of the coupling member 20 is coupled to the support bracket 3 and the rear side member 2 in the vehicle width direction, and the outer flange portion 20c is coupled to the rocker panel 4 in the vehicle width direction. The vehicle width direction input at that time is received by the rear side member 2 and the rocker panel 4 from the support bracket 3 via the coupling member 20. As a result, the deformation of the support bracket 3 due to the input can be prevented, and the riding comfort and steering stability when turning the vehicle can be improved.

Further, in this embodiment, the expanded portion 20e is formed in the inner flange portion 20b of the coupling member 20, and the support bracket 3 and the rear side member 2 are integrally connected in the vertical direction by the expanded portion 20e. The rigidity of the support bracket 3 with respect to the vehicle width direction input at the time can be greatly increased, and the deformation of the support bracket 3 can be more reliably prevented.

Further, in this embodiment, the left and right support brackets 3 are connected by the connecting bar 18, so that the input in the vehicle width direction is received by the connecting bar 18 being stretched, and also from this point, the deformation of the support bracket 3 is prevented. can do.

DESCRIPTION OF SYMBOLS 1 Lower vehicle body 2 Rear side member 3 Support bracket 3a Upper wall part 3b, 3b 'inside, outer wall part 3c Front wall part 12 Trailing arm 20 Coupling member 20g Contact part A Closed cross section

Claims (1)

In a lower body structure of an automobile having left and right rear side members extending in the vehicle front-rear direction and a support bracket attached to the left and right rear side members and swingably supporting a front end portion of a trailing arm.
An upper wall portion coupled to the lower surface of the rear side member, the left and right support brackets; an inner and outer wall portion extending in a downward direction from the upper wall portion and supporting the trailing arm; It has a front wall part that connects the front ends of the inner and outer wall parts,
The left and right support brackets are provided with coupling members extending forward and coupled to the rear side member in the vehicle width direction,
The lower body structure of an automobile, wherein the coupling member forms a closed section with the support bracket and the rear side member, and has a contact portion that contacts a front wall portion of the support bracket in a vehicle front-rear direction.

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