JPS6341264Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile chassis frame structure, and more particularly to an automobile chassis frame structure at a joint portion between a side frame and a cross member.

Generally, an automobile chassis frame has an opening with a U-shaped cross section facing inward, as shown in Fig. 1.
Two side frames 1 and 1' extending in the longitudinal direction of a vehicle body (not shown) have respective ends of cross members 2 to 7 each having a U-shaped or square-shaped cross section fitted inside their cross sections. The cross members 3 to 6 are connected to the side frame 1 or 1' through vanes 8 or 5d as reinforcing members at both ends and upper and lower surfaces of the cross members 3 to 6, as shown in FIG. The vane has a shape in which each vertex of an obtuse isosceles triangle is slightly cut out, and depending on the shape of the cross member, the vane may be a single member or may be integrated into the cross member. That is, for a cross member with a U-shaped cross section like the cross member 4, a wing plate 8 (hereinafter referred to as a gusset) is provided as a separate member from the cross member 4, and the cross section is as shown in FIG.
For the shaped cross member 5, the flange 5c of the cross member main body 5a is connected to the cross member main body 5a.
spread toward the outer edge 5b of the cross member body 5.
A wing plate 5d (hereinafter referred to as wing-shaped portion) is integrated with a.
is formed.

The gusset 8 increases the strength and rigidity of the connecting portion between the side frames 1, 1' and the cross members 3 to 6, and also increases the strength and rigidity of the side frames 1, 1' by connecting the side frames 1, 1' and the cross members 3 to 6.
This is provided to disperse concentrated stress occurring at the joints of the side frames 1 and 1', and to prevent damage to the joints of the side frames 1 and 1' caused by the concentrated stress.

Therefore, in order to disperse the concentrated stress generated in the side frames 1, 1', the gusset 8 should be extended as much as possible along the longitudinal direction of the side frames 1, 1', but this is due to the increase in the material of the gusset 8. This results in the disadvantage that the weight of the chassis frame increases. Therefore, there is a limit to how much the gusset 8 can be extended. That is, the gusset 8 having a uniform plate thickness has the disadvantage that high stress may be generated at the end position A of the gusset 8 in the side frames 1, 1'.

The present invention was devised to solve the above-mentioned drawbacks, and its purpose is to provide an automobile chassis frame structure that alleviates the high stress generated at the gusset end position of the side frame.

In order to achieve the above-mentioned object, the present invention provides that when a cross member is coupled to a side frame, the intervening blade plate has a thickness that increases from an arbitrary point on both ends of the blade plate toward its tip. The car chassis frame structure is characterized by a tapered shape that becomes thinner at the tip.
Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIG. 3, the gusset 18 has a shape in which each vertex of an obtuse isosceles triangle is slightly cut out, and its upper surface is tapered from end B to tip C so that the thickness becomes thinner at tip C. is formed.

The gusset 18 of the present invention is formed as described above, and when connecting the cross members 3 to 6 to the side frames 1 and 1' via the gusset 18,
With the tapered surface side formed on the gusset 18 facing the surfaces of the cross members 3 to 6 that the gusset 18 contacts, the gusset 18 is opened in the same manner as the conventional gusset 8.
are fixed to the upper and lower surfaces of the ends of the cross members 3 to 6 by welding or the like. The ends of the cross members 3 to 6 to which the gussets 18 are fixed are fitted inside the cross sections of the side frames 1 and 1'. In this case, since the end of the gusset 18 is tapered, the stress at the end C position of the gusset 18 in the side frame can be alleviated. Further, by providing a taper, it is possible to shorten the length of the gusset (the conventional length is indicated by a chain line), and it is possible to reduce the weight of the chassis frame. FIG. 4 shows another embodiment of the present invention. In the case of the cross member 15 having a cross-sectional shape,
Since the upper surface of the wing-shaped portion 15d that spreads toward the side is tapered from an arbitrary position D toward the tip E, the thickness becomes thinner at the tip E, so that the thickness of the wing-like portion 15d is tapered so that the thickness becomes thinner at the tip E. The stress at the end position of the cross member 15 can be alleviated.

As is clear from the above description, according to the present invention, it is possible to alleviate the concentrated stress occurring in the side frame, and the weight of the chassis frame can be reduced.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a general chassis frame, Figure 2 is a perspective view of a general chassis frame.
The figures are an enlarged perspective view of a portion of FIG. 1, FIG. 3 is a perspective view of one embodiment of the present invention, and FIG. 4 is a perspective view of another embodiment of the present invention. 1, 1'...Side frame, 2, 3, 4, 5,
6, 7...Cross member, 5d, 8, 15, 15
d... wing plate.

Claims (1)

[Scope of utility model registration request] In an automobile chassis frame structure having two side frames and a plurality of cross members connected to the side frames via vanes that widen toward the outer edges, the vanes have a wing-like shape. 1. An automobile chassis frame structure, characterized in that it is formed in a tapered shape so that the thickness becomes thinner at each end from an arbitrary point at both ends in the direction.