JPH0577762A - Cross member connecting structure for car - Google Patents

Abstract

PURPOSE:To improve the connecting strength of a cross member, increase the rigidity of a connecting part and enable reduction of the parts number. CONSTITUTION:End parts 3a, 3b of a cross member 3 and supporting member 12a, l2b are connected to side frames 4a, 4b by welding under the condition that the end parts 3a,3b of the cross member 3 are arranged in a penetrating manner into the supporting members 12a, 12b which are of 'L' letter section and support bump-stoppers 13a, 13b, the end parts 3a, 3b of the cross member 3 are inserted into inserting holes 19, 20 formed in side frames 4a, 4b, and the cross member 3 and the supporting members 12a, 12b are assembled to the side frames 4a, 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile cross member connecting structure.

[0002]

2. Description of the Related Art Various cross members are installed between a pair of left and right side frames on the body of an automobile. Conventionally, the cross member is usually joined to the side member by spot welding flange portions provided at both end edges of the cross member or both ends of the cross member to the side member.

In the rear suspension cross member, after the cross member is joined to the side frame in the vehicle body assembling process, parts related to the rear suspension (for example, bump stoppers, lateral rod side stays, etc.). In reality, various parts such as an engine mounting bracket and the like are attached to the cross member.

[0004]

However, in the conventional cross member connecting structure as described above, since the cross member is simply spot-welded to the side frame, the connecting strength is weak and the rigidity of the connecting portion is low. There is. Further, in the case of a cross suspension member for a rear suspension, etc., many assembly parts are used in the vehicle body assembly process, so that the number of man-hours required for the line assembly in the conventional assembly work is large, and the production efficiency can be improved. There is also the problem that it cannot be done.

The present invention has been made to solve such a problem, and its main purpose is to improve the joint strength of the cross member and to increase the rigidity of the joint portion. An object of the present invention is to provide such a cross member coupling structure for an automobile.

[0006]

In order to achieve the above-mentioned object, in the present invention, a support member having an L-shaped cross section for supporting a bump stopper is formed with a side member having an end portion of the cross member penetratingly arranged therethrough. Under the state where the end portion of the cross member is inserted into the inserted hole and the cross member and the support member are assembled to the side frame,
The end portion of the cross member and the support member are welded to the side frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a one-box type automobile 1, in which a rear suspension cross member 3 is arranged at a rear portion of a vehicle body 2 of the automobile 1. The cross member 3 is formed by bending one rod-shaped member into a crank shape, and both ends 3a and 3b thereof are connected to a pair of left and right side frames 4a and 4b. Then, as shown in FIGS. 2 and 3, various parts such as a lateral rod center holder 5, a lateral rod side stay 6, a rear engine mount bracket 7, a flexible hose bracket 8, and a muffler are provided at an intermediate portion of the cross member 3. The hangers 9a, 9b and the like are integrally attached.

Further, both ends 3a, 3 of the cross member 3 are
b, as shown in FIG.
And support members 12a and 12b having an L-shaped cross section, which have bent portions 11a and 11b, respectively, are attached.
That is, the bent portions 11 of the support members 12a and 12b
Both ends 3a, 3b of the cross member 3 are integrally joined to a and 11b by welding under a penetrating state, and both ends 3a, 3b of the cross member 3 protruding from these bent portions 11a, 11b. Are arranged substantially parallel to the substrate portions 10a and 10b of the support members 12a and 12b with a slight distance therebetween.

Then, the above-mentioned support members 12a, 1
As shown in FIG. 3, bump stoppers 13a and 13b are fixed to the lower surfaces of the substrate portions 10a and 10b of 2b, respectively.

On the other hand, the side frames 4a and 4b are provided with flanges 1 on both sides (upper side) of the base 14 having a U-shaped cross section.
5 and 16 are formed by bending (see FIG. 3),
Insertion holes 19 and 20 are formed in the facing pieces 17 and 18 of the base 14 that face each other.

Next, the cross member 3 is attached to the side frame 4
The work of connecting to a and 4b will be described.

First, the various parts 5 to 9 are integrally attached to an intermediate portion of the cross member 3, and these parts 5 to 9 are integrated.
And one cross member (assembly) 21
Make up.

Thereafter, the above-mentioned combined body 21 is assembled between the side frames 4a and 4b as follows. That is, by moving the side members 4a and 4b from both sides of the cross member 3 toward the cross member 3,
As shown in, the insertion holes 19 of the side frames 4a, 4b,
Both end portions 3a and 3b of the cross member 3 are inserted and arranged in the cross member 20, and the lower surfaces 22 of the base portions 14 of the side frames 4a and 4b are joined and arranged on the substrate portions 5a and 5b of the support members 7a and 7b, respectively.

Next, as shown in FIG. 4, both end portions 3a, 3b of the cross member 3 and the peripheral portions of the insertion holes 19, 20 of the side members 4a, 4b are joined by welding 23, and at the same time, the side members 4a, 4b. The lower surface 22 of 4b, the substrate portions 10a and 10b of the support members 12a and 12b, and the bump stoppers 13a and 13b are joined together by spot welding 24 (4 points). As a result, the cross member 3 and the bump stoppers 13a and 13b are connected via the support members 12a and 12b to the side frame 4a,
It is attached to 4b.

According to the cross member coupling structure having such a structure, the support members 12a and 12b can be used as a supporting member for the bump stoppers 13a and 13b and also as a supporting member for the cross member 3. Therefore, the number of parts can be reduced. In addition, the combination 21 is joined to the side frames 4a and 4b by welding 23 between both end portions 3a and 3b of the cross member 3 and the peripheral portions of the through holes 19 and 20 of the side frames 4a and 4b. Substrate portions 10a and 10b of the support members 12a and 12b and lower surfaces 2 of the side members 4a and 4b.
Since the spot welding 24 is performed between the two, it is possible to increase the bonding strength (rigidity).

Further, in this example, before the assembling to the side frames 4a and 4b of the cross member 3, various parts 5 are attached.
9 to 9 are integrally attached to the cross member 3 in advance and the combined body 21
Therefore, the dimensional accuracy of the combined body 21 can be improved. Moreover, since the work of assembling the parts to the cross member 3 in the vehicle body assembling process is eliminated, it is possible to reduce the number of man-hours for the line work, and at the same time, the slender components such as the lateral rod center holder 5 are assembled in the vehicle body assembling process. Therefore, the assembling work can be facilitated.

The above is a description of one embodiment of the present invention.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention. For example, it goes without saying that the present invention is applicable not only to the rear suspension cross member 3 but also to a connecting structure for a front suspension cross member or the like.

[0019]

As described above, according to the present invention, the end portion of the cross member penetratingly arranged in the bump stopper supporting support member having an L-shaped cross section is inserted into the through hole of the side frame, and the end portion of the cross member and Since the support member is welded to the side frame, the support member can also be used as a bump stopper support member and a cross member support member, and the number of parts can be reduced and the connection can be achieved. The strength (rigidity) can be increased.

Further, by assembling the cross member to which various parts related to the suspension and the like are previously attached to the side member as described above, the dimensional accuracy of the combination of the cross member and various parts can be improved. In addition to being able to improve, it is possible to facilitate the line work in the vehicle body assembly process.

[Brief description of drawings]

FIG. 1 is a perspective view of a one-box type automobile having a cross member coupling structure according to the present invention.

FIG. 2 is a perspective view showing a cross member coupling structure according to the present invention.

FIG. 3 is an exploded perspective view of the cross member coupling structure.

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

[Explanation of symbols]

 1 One-box type automobile 2 Body 3 Cross member 3a, 3b End 4a, 4b Side frame 12a, 12b Support member 13a, 13b with L-shaped cross section Bump stopper 19, 20 Insert hole 21 Assembly 22 Lower surface 23 Welding 24 spot welding

Claims (2)

[Claims] 1. An end portion of a cross member is arranged to penetrate a support member having an L-shaped cross section for supporting a bump stopper, and the end portion of the cross member is inserted into an insertion hole formed in a side frame to form the side frame. A structure for connecting a cross member of an automobile, characterized in that an end portion of the cross member and a support member are welded to the side frame under a state in which the cross member and the support member are assembled. 2. The cross member coupling structure for an automobile according to claim 1, wherein the cross member is a suspension cross member in which various parts related to a suspension or the like are integrally assembled in advance.