JP2003160067A - Rear body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear body structure of an automobile capable of improving the rigidity of a coupling part of each side member with a cross-member and not requiring high accuracy in coupling operation. <P>SOLUTION: The rear body structure of the automobile is configured so that left and right side members are coupled with each other by the cross- member, wherein the coupling part of each side member 20 with the cross- member 40 is reinforced with a reinforcing member 30. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear body structure of an automobile capable of improving rigidity of a joint portion between a side member and a cross member.

[0002]

2. Description of the Related Art FIG. 7 shows a rear body structure of an automobile which adopts a trailing arm type suspension, and a rear floor pan 10 constituting a floor of a vehicle body 100.
A pair of substantially U-shaped rear floor side members 102 are disposed on the lower surface side of the vehicle 1 on the left and right sides in the front-rear direction of the vehicle body. Both ends of a rear floor cross member 103, which is arranged in the vehicle width direction, are connected to the rear floor side members 102 at substantially intermediate positions in the longitudinal direction.
The rear floor cross member 103 is formed in an inverted hat shape in cross section as shown in FIG. 8, and is joined to the side surface 102a of the rear floor side member 102 by abutting it with mating flanges 103a and 103b provided on the end surface thereof. (See FIG. 9). The mating flange 103
a is erected upright on the lower surface 103c of the rear floor cross member 103 and has a mating flange 103b.
Is provided on the side surface 103d of the rear floor cross member 103 toward the outside.

The left and right rear floor side members 102
Trailing arm hangers 104 are joined to the front end of each of them, as shown in FIG. A trailing arm 105 that suspends a rear wheel is swingably supported by a trailing arm hanger 104 via a support bolt 106. A rear axle shaft 107 supporting a rear wheel is supported at the rear end of the trailing arm 105, and the rear end of the trailing arm 105 is suspended on the rear floor side member 102 via a coil spring 108. There is. The coil spring 108 is concentrically arranged around a bump stopper 109 provided on the lower surface of the rear floor side member 102 (see FIG. 10). The rear end of the trailing arm 105 is supported by the rear floor side member 102 via the shock absorber 110. On the outside of the left and right rear floor side members 102 in the vehicle width direction,
As shown in FIG. 9, the wheel house inner panel 111 is joined together with the flange portions 101 a at both ends of the rear floor pan 101.

[0004]

However, according to the above-mentioned conventional rear vehicle body structure, the rear floor cross member 1 is formed.
The mating flange 103a provided on the lower surface 103c of No. 03 upwardly has a difficulty in improving the coupling force.
The mating flange 103a is provided on the side surface 103d of the rear floor cross member 103.
Since it has no continuity with b, it has a poor binding force and is disadvantageous to the torsional rigidity of the vehicle body. A separate press process was required to provide the mating flanges 103a and 103b on the rear floor cross member 103. Further, since the rear floor side member 102 is aligned in the vehicle width direction, it is difficult to insert the parts, and high accuracy is required for the parts.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a rear vehicle body structure for an automobile, in which the rigidity of the joint portion between the side member and the cross member is improved and which does not require high precision in the joint work. .

[0006]

In order to solve the above-mentioned problems, the present invention provides a rear body structure of an automobile in which left and right side members are connected to each other by a cross member. It is reinforced with a reinforcing member. Further, the present invention is that the cross member is connected to the side member via the reinforcing member. Further, according to the present invention, a reinforcing member having a substantially U-shaped cross-section having a flange portion toward the outside at the upper end portion on the cross member side is arranged on the outer surface side of the side member, and the flange portion of the reinforcing member has a vehicle width. Direction cross-section is provided, and the cross member is joined so as to be assembled in the recess from above and below. Still further, according to the present invention, the reinforcing member extends a member, which is provided on the side member, for mounting a bump stopper supporting a coil spring for suspending a wheel, to a connecting portion between the side member and the cross member. Have applied it. Further, according to the present invention, the left and right side members are connected to each other by a cross member, and one end of the trailing arm is pivotally supported on the side members while the other end of the trailing arm is coiled. In a rear body structure of an automobile suspended on the side member via a shock absorber, a coil spring bracket for attaching a bump stopper supporting the coil spring to the side member is extended to a connecting portion between the side member and the cross member. To reinforce the coupling portion, and to provide a recessed portion in the vehicle width direction on the flange portion provided on the coil spring bracket,
The cross member is joined to the recess so as to be assembled in the vertical direction.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a side view showing a rear floor side member and a trailing arm type suspension, FIG. 2 is an enlarged perspective view showing a joint portion between the rear floor side member and the rear floor front cross member of FIG. 1, and FIG. 3 is an exploded view of FIG. FIG. 1 is a perspective view and FIG. 4 and FIG.
3 is a cross-sectional view taken along line AA and line BB in FIG.

1 to 5, a pair of left and right rear floor side members 20 are arranged in the vehicle front-rear direction on the lower surface side of a rear floor pan 10 which constitutes a rear vehicle body 1 of an automobile. The rear floor side member 20 is a member that is elongated in the vehicle front-rear direction and has a substantially U-shaped cross section, and is joined to the lower surface side of the rear floor pan 10 via a flange portion (not shown). This rear floor side member 20
Has a step portion 20c formed such that the rear end portion 20b is higher than the front end portion 20a, and a coil spring bracket 30 having a forward extension is provided so as to cover the periphery of the step portion 20c. . A rear floor front cross member 40 arranged so as to connect the step portions 20c of the left and right rear floor side members 20 is joined to a side surface of the coil spring bracket 30.

The coil spring bracket 30 is
As shown in FIGS. 4 and 5, a reinforcing member having a substantially U-shaped cross-section that reinforces the joint portion between the rear floor side member 20 and the rear floor front cross member 40 is formed on the outer surface of the rear floor side member 20 over the step portion 20c. Are joined by spot welding w or the like. This coil spring bracket 30 is used for the rear floor side member 2
As shown in FIG. 6, the step portion 30c is formed so as to correspond to the step portion 20c of 0 and the rear end portion 30b is higher than the front end portion 30a. This rear end 30b
On the bottom side of the, trailing arm suspension 2
A bump stopper 51 that supports the upper end of the coil spring 50 and restricts the stroke of the trailing arm suspension 2 is mounted. The coil spring 50 is arranged around the bump stopper 51.

Trailing arm type suspension 2
The trailing arm hanger 52 is mounted on the front end portion 20a of the rear floor side member 20, and the trailing arm hanger 52 pivotally supports the front end 53a of the trailing arm 53 for suspending the wheels via the support bolt 55. There is. An axle shaft 4 supporting the rear wheel 3 is supported on the rear end portion 53b of the trailing arm 53. The trailing arm 53 includes a shock absorber 5 having a rear end portion 53b supported by the coil spring 50 and an upper end 54a supported by the rear floor side member 20.
Suspended by 4 and. The lower end of the coil spring 50 suspends the axle shaft support portion 56 of the trailing arm 53, and the shock absorber 54.
The lower end portion 54b of the trailing arm 53 supports the rear end 53c of the trailing arm 53 on the rear side of the axle shaft support portion 56.

The coil spring bracket 30 has
A flange portion 30d is provided on the side connected to the rear floor front cross member 40.
A concave portion 30e in the vehicle width direction is provided at d, and the rear floor front cross member 40 is joined by spot welding w so as to be assembled in the concave portion 30e from above and below. The rear floor front cross member 40 has an inverted hat-shaped cross section with a substantially U-shaped cross section, and the recess 30 is formed so as to match the rear floor front cross member 40.
e is formed. The rear floor front cross member 40 is joined to the lower surface of the rear floor pan 10 by spot welding w via a flange portion 40a provided at the upper end.

The coil spring bracket 30 includes
At the bump stopper 51 mounting part, the bump stopper 5
1 The cross-sectional shape is formed to match the mounting position,
The rear floor side member 20 is designed to maintain a constant sectional shape. The left and right flange portions on the left and right sides of the rear floor pan 10 have the coil spring bracket 30.
The outer upper end portion 30f and the lower end portion 60a of the wheel house inner panel 60 are joined by spot welding w. A portion indicated by a chain double-dashed line in FIG. 1 shows a side body outer panel 70 that constitutes a vehicle body.

According to the above construction, the coil spring bracket 30 for mounting the coil spring 50 of the trailing arm type suspension has its front end portion extended to the joint portion of the rear floor front cross member 40.
The rear floor front cross member 40 is connected to the coil spring bracket 30. The flange portion 30d of the coil spring bracket 30 is provided with a recess 30e in the vehicle width direction, and the rear floor front cross member 40 is joined by spot welding w so as to be assembled in the recess 30e from above and below. The coil spring bracket 30 has a large sectional shape at the bump stopper 51 mounting portion in accordance with the bump stopper 51 mounting position. In this way, since the rear floor side member 20 can maintain a constant cross-sectional shape, the strength of the rear floor side member 20 is not impaired.

Further, since the coil spring bracket 30 for mounting the coil spring 50 of the trailing arm type suspension has its front end extended to the joint portion of the rear floor front cross member 40, it is joined to the rear floor front cross member 40. The rigidity of the portion is improved, and the torsional rigidity of the vehicle body can be improved. Further, the flange portion 3 of the coil spring bracket 30
0d is provided with a recess 30e in the vehicle width direction.
Since the rear floor front cross member 40 is joined by spot welding w so as to be assembled to e from above and below, accuracy control in the vehicle width direction is eased. Also,
In the above-described embodiment, the rear floor front cross member 40 is positioned in the vehicle width direction by abutting against the rear floor side member 20, so that the assembly accuracy is not required. Compared with the conventional technique, the rear floor front cross member 40 does not require a conventional mating flange, so that the machining process can be omitted.

The present invention is not limited to the above-described embodiment, and for example, the recess 30e in the vehicle width direction provided in the flange portion 30d of the coil spring bracket 30 has an upper surface side or a lower surface of the flange portion 30d. May be formed on the side of the coil spring bracket 3
The material of 0 or the thickness can be arbitrarily set as required. Needless to say, the present invention can be appropriately modified and implemented within a range that does not change the gist of the present invention.

[0016]

As described above, according to the rear body structure of the automobile of the present invention, the following effects can be obtained.
In the rear vehicle body structure of an automobile according to claim 1, in which the left and right side members are connected to each other by a cross member, the joint of the side member and the cross member is reinforced by a reinforcing member, which improves the rigidity of the joint. It is possible to improve the torsional rigidity of the vehicle body. In the second aspect, since the cross member is connected to the side member via the reinforcing member, the side member can maintain a constant cross-sectional shape, so that the strength of the side member is not impaired. The reinforcing member having a substantially U-shaped cross section having an outward flange portion on the upper end portion on the cross member side is arranged on the outer surface side of the side member, and the flange portion of the reinforcing member is arranged in the vehicle width direction. Since the concave member is provided and the cross member is joined to the concave member so as to be assembled in the vertical direction, accuracy control in the vehicle width direction at the time of assembling is eased. Further, since it is unnecessary to machine the flange of the end surface of the cross member, workability can be improved and cost can be reduced. Since the connecting portions are continuous, the rigidity can be improved. Since the cross member can be assembled from one direction, accuracy control is easy. In claim 4, as the reinforcing member, a member for mounting a bump stopper, which is provided on the side member and supports a coil spring for suspending a wheel, is extended to a connecting portion between the side member and the cross member. Therefore, the member is not a separate component, and the cost can be reduced, and the bending and torsional rigidity of the vehicle body can be improved. The left and right side members are connected to each other by a cross member, and one end of the trailing arm is pivotally supported by the side members, and the other end of the trailing arm is connected to a coil spring and a coil spring. In a rear body structure of an automobile suspended on the side member via a shock absorber, a coil spring bracket for attaching a bump stopper supporting the coil spring to the side member is extended to a connecting portion between the side member and the cross member. Since the coupling portion is reinforced by providing a concave portion in the vehicle width direction on the flange portion provided on the coil spring bracket, and the cross member is joined to the concave portion so as to be assembled from the vertical direction,
It is possible to improve bending and torsional rigidity of the vehicle body.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a rear body structure of an automobile according to the present invention.

FIG. 2 is a perspective view showing a cross member connecting portion of the rear body structure of the automobile of the present invention.

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

5 is a cross-sectional view taken along the line BB of FIG.

6 is a side view showing the coil spring bracket of FIG. 1. FIG.

FIG. 7 is a side view showing a rear body structure of a conventional automobile.

FIG. 8 is a perspective view showing a cross member connecting portion of a rear body structure of a conventional automobile.

9 is a sectional view taken along line CC of FIG.

10 is a sectional view taken along line DD of FIG.

[Explanation of reference symbols] 1 rear vehicle body 2 trailing arm suspension 10 rear floor pan 20 rear floor side member (side member) 30 coil spring bracket (reinforcing member) 30d flange portion 30e recess 40 rear floor front cross member (cross member) 50 coil spring 51 bump stopper 53 trailing arm 54 shock absorber 56 axle shaft support

Claims (5)

[Claims] 1. A rear vehicle body structure of an automobile in which left and right side members are connected to each other by a cross member, wherein a connecting portion of the side member with the cross member is reinforced by a reinforcing member. Construction. 2. The rear vehicle body structure according to claim 1, wherein the cross member is connected to the side member via the reinforcing member. 3. A reinforcing member having a substantially U-shaped cross-section having a flange portion toward the outside at the upper end portion on the cross member side is disposed on the outer surface side of the side member, and the flange portion of the reinforcing member is arranged in the vehicle width direction. 3. The rear body structure of the automobile according to claim 1, wherein the cross member is joined so as to be assembled in the recess from above and below. 4. The reinforcing member is a member provided with a bump stopper for supporting a coil spring for suspending a wheel, which is provided on the side member, and extends to a connecting portion between the side member and the cross member. The rear body structure of the automobile according to any one of claims 1 to 3, wherein: 5. The left and right side members are connected to each other by a cross member, and one end of a trailing arm is pivotally supported by these side members, and the other end of the trailing arm is provided with a coil spring. In a rear body structure of an automobile suspended on the side member via a shock absorber, a coil spring bracket for attaching a bump stopper supporting the coil spring to the side member is extended to a connecting portion between the side member and the cross member. A connecting portion is reinforced, a concave portion in the vehicle width direction is provided in a flange portion provided in the coil spring bracket, and the cross member is joined to the concave portion so as to be assembled in the vertical direction. Rear body structure.