Abstract: In order to study the effect of torsion beam deformation on toe and camber angle of a torsion beam suspension vehicle when the vehicle is offline,taking the toe and camber angle of the torsion beam of an electric taxi as the research object,the combination of numerical simulation technology and bench verification was used to complete the toe and camber angle mechanical compensation and bench verification at the development stage of the torsion beam components. Compared with the traditional method of using the statistical analysis results of small batch of vehicle toe and camber angle to compensate the toe and camber angle of torsion beam, the development cycle of the method proposed was greatly shortened,and a new design and verification method was provided for the mechanical compensation of the toe and camber angle of torsion beam suspension by the main engine factory. The main results are as follows: 1) using the numerical simulation method of torsion beam deformation,after the offline load applied by the spring to the torsion beam,the toe and camber angle changes of torsion beam are calculated and obtained, which are 2.7′ and -31.5′ respectively; 2) the torsion beam structure has little influence on the toe angle change,but has great influence on the camber angle change; 3) based on the numerical simulation deformation results of the toe and camber angle of the torsion beam,the equivalent and reverse mechanical angle compensations are given to the toe and camber angle of the torsion beam,and the physical verification was carried out using the torsion beam suspension system test bench; 4) comparing the numerical simulation data of the toe and camber angle change of the torsion beam with the bench verification data,the error is within 10 %,and the numerical simulation results of the torsion beam deformation are in good agreement with the bench verification results. Finally,through the batch verification of the whole vehicle,it meets the production requirements of the main engine factory.

Key words: torsion beam deformation, toe and camber angle, numerical simulation, bench verification