A three-cavity multi-layer welded front longitudinal beam

Abstract

The invention provides a three-cavity-body multi-layer welding front longitudinal beam. The three-cavity-body multi-layer welding front longitudinal beam comprises a first longitudinal beam, a second longitudinal beam, a first reinforcing plate and a second reinforcing plate, wherein the first longitudinal beam and the second longitudinal beam form a closed first square frame, the first reinforcing plate and one edge corner of the first square frame form a closed second square frame, the second reinforcing plate and another edge corner of the first square frame form a closed third square frame, and the second square frame and the third square frame are respectively located in the first square frame and distributed in an opposite angle mode. The three-cavity-body multi-layer welding front longitudinal beam has the advantages that the three-cavity-body cross section design is adopted, the situation that the front longitudinal beam deforming type of a traditional cross section is unstable is effectively improved, the front longitudinal beam cross section type is changed, under the condition of the same material and the same weight, the front longitudinal beam safe collision energy absorbing requirement is effectively met, crushing force and energy absorbing indexes are effectively improved, and the automobile body lightening requirement is met.

Description

technical field [0001] The invention relates to a car body, in particular to a three-cavity multi-layer welded front longitudinal beam in the car body. Background technique [0002] According to the new safety regulation C-NCAP in 2012, the car collides head-on with a rigid wall at a speed of 50km / h. Combined with the drop weight test, the energy absorption characteristics of the front longitudinal beam design can be easily verified. [0003] The deformation mode and energy absorption of the front longitudinal beam directly affect the intrusion of the passenger compartment and the acceleration damage value of the occupants. The front longitudinal beam is the basic load-bearing unit of the body frame structure and the key component for absorbing collision energy in the structure. It is generally used in The energy-absorbing area at the front end of the frame, its energy-absorbing characteristics directly determine the crash performance of the car. The component must not only...

AI Technical Summary

Problems solved by technology

[0004] The unreasonable design of the traditional hat-shaped cross-section can easily lead to uncontrollable deformation such as insufficient energy absorption, bending, and indentation of the flange. The front longitudinal beam of this cross-section will make the acceleration of the whole vehicle higher in the later stage of the collision, and then reduce the design margin.

At the same time, it increases the difficulty of constraint system matching

The deformation of the front longitudinal beam of the traditional section is not easy to control, so the energy absorption cannot meet the design requirements, and there are deficiencies in improving the utilization rate of materials or reducing the weight of the front longitudinal beam

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