Combined longitudinal beam of aluminum alloy frame

Abstract

A combined longitudinal beam of an aluminum alloy frame is composed of a front longitudinal beam, a rear longitudinal beam and connecting insertion plates, the front longitudinal beam and the rear longitudinal beam are staggered and offset in the transverse direction and form an overlapping combination area in the longitudinal direction, the two side edges of the upper connecting insertion plate and the lower connecting insertion plate are inserted into connecting grooves in the side faces of the front longitudinal beam and the rear longitudinal beam in the overlapping area respectively and are welded and fixed, and the combined longitudinal beam is formed. The two longitudinal beam combination structures are adopted for connection, after the two longitudinal beam combination structures are further combined with a battery compartment on the frame, the overall structural rigidity is high, manufacturing is easy, and the offset distance between the front longitudinal beam and the rear longitudinal beam can be flexibly adjusted to adapt to different chassis plate spring positions.

Description

technical field [0001] The invention relates to the technical field of new energy automobile manufacturing, in particular to an aluminum alloy vehicle frame combined longitudinal beam. Background technique [0002] The frame is generally composed of longitudinal beams and beams, and then the longitudinal beams and beams are connected by riveting or welding to form a strong rigid frame. In the traditional steel structure frame, the longitudinal beams are mainly channel-shaped or box-shaped, and the length direction runs through the entire body. According to the needs of other assembly parts, it can be made into a curved shape in the horizontal plane or in the vertical plane. [0003] In the field of new energy vehicles, in order to reduce the weight of the frame, an aluminum alloy frame can be designed, including aluminum alloy longitudinal beams. Although the elastic modulus of aluminum alloy is only one-third of that of steel, it has obvious advantages in light weight, but...

AI Technical Summary

Problems solved by technology

This solution has two major deficiencies: 1) The combined beam and hard point structure are relatively complex, which increases the complexity of frame manufacturing; 2) There are many structures around the hard point, resulting in the assembly space of the hard point structure itself and the assembly of the chassis leaf spring system The space is tight and the assembly operation is difficult

[0013] However, the above technical solutions have the following disadvantages: Large-area thermal welding of the joints of aluminum alloy profiles will inevitably cause changes in the metal structure of the aluminum alloy, coarse grains, and a loss of at least 40% of the mechanical properties of the welded parts, which is not conducive to longitudinal The stress on the overall structure of the beam is likely to cause stress concentration and weld cracking; in addition, the above scheme also needs to manufacture multiple sets of extrusion dies for production and use, which is undoubtedly not conducive to cost reduction to a certain extent

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