Framework structure of an automobile body

Details Framework structure of an automobile body Framework structure of an automobile body

1999-01-21

2001-01-09

Dayoan, D. Glenn (Department: 3612)

Land vehicles: bodies and tops

Bodies

Structural detail

C296S190050, C296S203030

Reexamination Certificate

active

06170906

ABSTRACT:

BACKGROUND OF THE DISCLOSURE
1. Field of the Invention
This invention relates to a framework structure of an automobile body formed of a lightweight metal material.
The present application is based on Japanese Patent Application No. Hei. 10-10288, which is incorporated herein by reference.
2. Description of the Related Art
For a lightweight metal material such as aluminum, a long size material which is complicated in cross section can be formed comparatively easily by extrusion or the light weight metal material can be provided with die casting. (Moreover, a strength equivalent to that of steel.) Thus, in recent years, attention has been focused on applications of light weight metal material as a frame material of an automobile.
By the way, a die casting has high rigidity, but is poor in toughness. Thus, if an extrusion is simply welded to the die casting, the die casting is broken due to impact load at the vehicle collision time and impact energy absorption characteristic at the deformation time, one of excellent features of the aluminum material, is impaired.
SUMMARY OF THE INVENTION
In view of the foregoing, it is therefore an object of the invention to provide a framework structure of an automobile body designed to be able to enhance yield strength of a joint part of a die casting member and an extrusion-molded member against the impact load.
According to the invention, there is provided a framework structure of an automobile formed of a lightweight metal material, in which a press-molded member is placed at a joint part of a die casting member and an extrusion-molded member. In doing so, insufficient toughness of the die casing member is reinforced by the press-molded member, so that the impact energy absorption performance of a welded joint part of the die casting member and the extrusion member is enhanced.
Features and advantages of the invention will be evident from the following detailed description of the preferred embodiments described in conjunction with the attached drawings.


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