JPS6319258Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the vehicle body structure of the rear suspension attachment part. Specifically, the invention involves cutting out the middle rear side of the cross member to which the trailing arm is attached, and using this notch to recess the floor panel. By welding the front outer wall surface of the tire well for storing auxiliary tires, which is formed by using This invention relates to a device that increases the overall strength of the cross member or rear suspension attachment portion against loads and shortens the vehicle length.

For example, the configuration of the rear suspension attachment part in a so-called monokotsukku type vehicle body structure includes:
There is one shown in Japanese Utility Model Application Publication No. 50-59720.
In this configuration, both ends of the trailing arm are welded to the left and right side members, and the base end of the trailing arm is rotated vertically via a bracket to the cross member, which has a closed cross-section structure by covering the upper surface with a floor panel. It is configured to be movably supported. In order to effectively prevent the tires from shaking and swinging in the left-right direction, this trailing arm is supported by the cross member at two locations, one near the side members and the other near the center of the vehicle body. The width of the proximal end support portion of the cross member is increased, and this is supported by the cross member.

By the way, as is clear from Figures 1 and 2 of the above-mentioned publication, the center of the tire and the supporting part of the trailing arm for the cross member are offset in the vehicle width direction. During braking, etc., a considerable bending load is applied to the cross member via the trailing arm. In conventional rear suspension support structures in which the upper surface of a cross member with a U-shaped cross section is simply covered with a floor panel, even though the cross member has sufficient load-bearing strength, its cross section is limited due to its weight and dimensional limitations. It is not possible to increase the coefficient beyond a certain level,
Therefore, when a continuous impact heavy load is transmitted, especially from the supporting portion of the trailing arm near the center of the vehicle body, the cross member is elastically bent and deformed, causing the floor panel to become sticky. I couldn't avoid it.

This invention was devised in view of the above circumstances, and its purpose is to create a rear suspension with increased rigidity so that elastic deformation due to the load from the trailing arm is minimized without increasing weight. It is an object of the present invention to provide a vehicle body structure with a section for attaching a vehicle.

These objectives were achieved by taking the following technical measures.

That is, the rear part of the middle part of the cross member was cut out, and the front outer wall surface of the tire well for the auxiliary tire, which was formed by recessing the floor panel, was fitted into the cutout and welded. A trailing arm support bracket is attached to the cross member near the weld.

Since the tire well is integrally formed by recessing the floor panel, its rigidity against bending is extremely high. In the present invention, the front outer wall surface of the tire well is welded to the cutout portion of the cross member, so that the front upright member of the tire well takes charge of a part of the closed cross section of the cross member. As a result, the vehicle body structure according to the present invention has a structure in which the rigidity of the tire well that is integrally connected to the cross member with a closed cross section structure is added to the inherent rigidity of the cross member with a closed cross section structure. The rigidity of the structure of the present invention against the load from the member's trailing arm is dramatically increased compared to the rigidity of conventional cross members, and the sticky phenomenon of the floor panel described above is effectively eliminated. Avoided. Also,
Since the tire well is welded to a notch formed in a part of the cross member, the dimension from the front end of the cross member to the rear end of the tire well can be saved. shortening of,
Alternatively, it leads to effective use of vehicle body space.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of the vehicle body structure according to the present invention, showing the floor panel 1 with imaginary lines for convenience, and FIG. 2 shows the structure shown in FIG. A cross-sectional view when cut along a plane that passes through the
FIG. 3 is a sectional view taken along the line -- in FIG. 2.

As shown in FIG. 1, the rear side portion of the vehicle body is comprised of a tire house 3 that continues to the rear end of the side sill 2, and a side member 4 that extends front and rear along the inside of these. The side sill 2 includes an inner panel 5 and an outer panel 6.
The floor panel 1 is attached to horizontally bent flanges 5a and 6a formed at the upper ends of these flanges 5a and 6a.
A closed cross-section structure is created by welding the parts over each other. In addition, the side member 4
is a member having a substantially L-shaped cross section in which an upright piece 7 and a horizontal piece 8 are continuous, and a flange 8a formed at the edge of the horizontal piece 8 is attached to the inner wall of the inner panel 5 of the side sill 2 or the inner wall of the tire house 3. At the same time, a flange 7a formed by horizontally folding the upper edge of the upright piece 7 is welded to the lower surface of the floor panel 1. Therefore, this side member 4 also includes the inner panel 5 of the side sill and the floor panel 1.
It works together to form a closed cross-section structure. In addition, the code 9 is a trailing arm (code 10 in Figure 2)
Shock absorber (not shown) interposed between
This is a bulge of the housing for accommodating the upper end of the housing.

Although only the right side of the vehicle body rear side portion is shown in the drawings, the left rear side portion is constructed symmetrically with respect to the center of the vehicle body.

A cross member 11 is welded to a portion of the left and right side members 4 located in front of the tire house 3 in a spanning manner to support the base end of the trailing arm 10 and to increase the rigidity of the vehicle body. There is. This cross member 11 has a substantially U-shaped cross-sectional shape with an open upper part, and flanges 12a and 13a formed at the upper edges of a pair of front and rear upright pieces 12 and 13 are welded to the lower surface of the floor panel 1, respectively. This provides a closed cross-sectional structure surrounded by the floor panel 1 and the cross member 11.

The floor panel 1 is a substantially horizontal plate member welded so as to overlap and close the upper portions of the side sills 2, side members 4, and cross members 11. In the present invention, as clearly shown in FIGS. 2 and 3, the rear part of the floor panel 1 from the cross member 11 is recessed to match the tire shape, and the tire well 14 for the auxiliary tire is formed. is forming. It is clear that the section modulus of this floor panel 1 becomes extremely large simply by recessing it in this manner, and the rigidity against bending increases significantly.

On the other hand, the rear upright piece 12 at the intermediate portion of the cross member 11 has a notch 1 so that the front outer surface of the tire well 14 fits snugly therein.
5 is provided, and a tire well 14 is welded to this. In this case, as clearly shown in FIGS. 2 and 3, a flange portion 19 is formed at the edge of the notch 15 to abut along the left and right side uprights 16, 17 and the bottom surface 18 of the tire well 14. This is convenient for welding work.

As shown in Figure 3, the cross member 11
The connecting portion between the tire well 14 and the tire well 1
The four front upright members 20 cooperate with the cross member 11 to form a closed cross-sectional structure. As a result of doing this, the upright pieces 12, 1 at the front and rear of the cross member 11
3. The front upright member 20 of the tire well and the front side upright members 16, 17 of the tire well are integrated in a solid state to dramatically increase the section modulus of the area surrounded by the dashed line in FIG. Therefore, the rigidity of this portion against bending or twisting is dramatically increased compared to the conventional case.

In the vehicle body structure according to the present invention, the support brackets 21 and 22 of the trailing arm 10 are
As shown in FIG.
2 to the cross member 11 near the joint with the tire well 14, it is most effective.

As explained above, the vehicle body structure of the rear suspension attachment part of the present invention has a tire well formed by cutting out the rear middle part of the cross member that extends between the side members, and recessing the floor panel into this notch. Since the welding was performed so as to fit the front lower outer wall, it was possible to obtain a section modulus that is the sum of the section modulus of the cross member and the section modulus of the tire well.This allows us to increase the rigidity of the cross member at the tire well joint. It can be dramatically strengthened compared to the past. As a result, the elastic bending deformation of the cross member when subjected to an impact load from the trailing arm can be made extremely small, and the conventional drawback that the floor panel is sticky can be effectively solved. Furthermore, since the number of members or the plate thickness is not increased, there is no increase in weight at all.

It goes without saying that the scope of the present invention is not limited to the embodiments shown in the drawings. For example, the present invention can be applied to a pipe-shaped cross member in the same manner as in the above embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG.
A perspective view of the floor panel shown by imaginary lines, FIG. 2 is a sectional view of the floor panel shown in FIG. 1 taken along a plane slightly below the floor panel, and FIG. FIG. 11... Cross member, 14... Tire well, 15... Notch, 22... Support bracket.

Claims (1)

[Scope of utility model registration request] The rear part of the middle part of the cross member is cut out, and the front outer wall surface of the tire well for the auxiliary tire, which is formed by recessing the floor panel, is fitted into the cutout part and welded. A vehicle body structure of a rear suspension attachment part characterized by a trailing arm support bracket attached to the member.