JPH0120221Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> The present invention relates to a vehicle frame structure.

<Conventional technology> Ladder-type frames have been most commonly used as vehicle frames for trucks, etc., but the most basic form of this ladder-type frame consists of two vertical members (side rails) ) are lined up parallel to the direction of travel of the vehicle, an appropriate number of cross members are placed at right angles to the cross members, and the vertical members and cross members are joined in an appropriate manner to form a ladder shape. There is.

An example of this type of frame structure is the one shown in FIG. 3 (see Japanese Utility Model Application No. 143218/1983).

To explain this, a side rail 1 having a U-shaped cross section is attached to a cross member 2 which also has a U-shaped cross section.
is connected to the other side rail (not shown).

That is, both the upper and lower flange portions 1 of the side rail 1
Gussets 3 and 4 for connecting members are attached to a and 1b, respectively.
Both the upper and lower flange portions 2 of the cross member 2
a and 2b are fastened together by rivets 5.

These side rails 1 and cross members 2 constitute a frame.

The side rail 1 is a main component that penetrates the entire length of the vehicle and bears all the loads.
The cross member 2 is a member to prevent twisting and parallelogram deformation of the frame, and may also serve as a mounting location for various devices.

<Problems to be solved by the invention> However, in such a conventional vehicle frame structure, both the side rail 1 and the cross member 2 have a U-shaped cross section, that is, the frame has an open cross-sectional shape, Therefore, although it has excellent flexibility, it has problems in terms of strength such as low torsional rigidity.

Furthermore, in order to solve this problem, if the frame is constructed by forming at least one of the side rails 1 and the cross member 2 with a member having a closed cross section, the torsional rigidity of the entire frame is improved, but , lacks flexibility in manufacturing, and
Because it has a closed cross-sectional shape, it can easily be used for cabs, rear bodies,
When attaching various equipment such as the engine, drive unit, and axle, it becomes difficult to fasten with rivets, making it difficult to assemble the frame.Furthermore, since the entire structure is welded, the quality of the frame as a product may be affected due to thermal distortion, etc. There was a problem that it was difficult to keep it constant.

The present invention was developed in view of these conventional problems, and aims to solve the above problems by improving the torsional rigidity of the entire frame without impairing the ease of attaching various devices to the frame. shall be.

<Means for Solving the Problems> Therefore, the present invention provides a vehicle frame structure in which a pair of side rails having a U-shaped cross section are connected to each other by a cross member, which is fastened to the inner surface of the outer wall of the side rail. a first gusset which is formed in a U-shape in cross section, is disposed such that its open inner surface faces the open inner surface of the side rail, and is fastened to both upper and lower flange portions of the side rail. and a second gusset, the cross member formed in a closed cross-sectional shape was passed through the second gusset and abutted against the first gusset, and the cross member and the first and second gussets were welded together. The structure is as follows.

<Function> According to this configuration, the joint between the side rail and the cross member is formed in a closed cross-sectional shape by the side rail, the first and second gussets, and the cross member, and the cross member also has a closed cross-sectional shape. Therefore, parts of the frame that are important in terms of strength are formed in a closed cross-sectional shape.

<Example> The example shown in FIGS. 1 and 2 will be described below. Incidentally, the same elements as those in the conventional example are given the same reference numerals as in FIG. 3, and the explanation thereof will be omitted.

A first gusset 12 is fastened to the inner surface of the outer wall of the side rail 11 having a U-shaped cross section with a rivet 13, and the open inner surface of the side rail 11 having a U-shaped cross section faces the open inner surface of the side rail 11. A second gusset 14 arranged as shown in FIG.

Then, the cross member 15 made of a cylindrical pipe and formed in a closed cross-sectional shape is passed through the second gusset 14 and abutted against the first gusset 12, so that the cross member 15 and the first and second gussets 12, 14 are welded together.

According to this configuration, the joint portion between the side rail 11 and the cross member 15 includes the side rail 11,
The first and second gussets 12, 14 and the cross member 15 form a closed cross-sectional shape (see Figure 2), and since the cross member 15 also has a closed cross-sectional shape, the parts that are important for the strength of the frame are Formed in a closed cross-sectional shape.

This improves the bending rigidity of the side rails 11 and the torsional rigidity of the cross member 15, thereby improving the torsional rigidity of the entire frame.

Then, the side rail 11 and the second gusset 1
4 is fastened with rivets 13, so
Stress can be distributed.

In addition, the only welded joints are the joints between the cross member 15 and the first and second gussets 12 and 14, and since riveted joints are mainly used, there is little effect of thermal distortion due to welding, and the quality of the frame as a product is improved. It is relatively easy to keep constant, and the degree of freedom in manufacturing is not impaired.

Further, since the side rail 11 has a U-shaped cross section, various types of equipment can be easily attached to the side rail 11.

In addition, since no members with special shapes are used, the cost will not be high.

<Effects of the invention> As explained above, according to the invention, the bending rigidity of the side rails and the torsional rigidity of the cross member are improved, and the torsional rigidity of the entire frame is improved. Since it is only connected to the first and second gussets and is mainly connected by fastening, there is little effect of thermal distortion due to welding, and it is relatively easy to maintain a constant quality of the frame as a product. The degree of freedom in manufacturing is also not compromised.

Furthermore, since the side rail has a U-shaped cross section, it is easy to attach various devices, and since no specially shaped members are used, there is no cost increase. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a longitudinal cross-sectional view of a main part of the same embodiment, and FIG. 3 is a perspective view showing a conventional frame structure. DESCRIPTION OF SYMBOLS 11... Side rail, 11a, 11b... Flange portion, 12... First gusset, 13... Rivet, 14... Second gusset, 15... Cross member.

Claims (1)

[Scope of utility model registration request] A vehicle frame structure in which a pair of side rails having a U-shaped cross section are connected to each other by a cross member, the first gusset being fastened to the inner surface of the outer wall of the side rail, and the first gusset having a U-shaped cross section and being open. The inner surface is arranged so as to face the open inner surface of the side rail, and
a second gusset fastened to both lower flange portions, the cross member formed in a closed cross-sectional shape is passed through the second gusset and abutted against the first gusset, and the cross member and the first, A frame structure for a vehicle, characterized in that the frame structure is welded to a second gusset.