Structure Analysis And Lightweight Research Of Electric Vehicle Drive Axle Housing

Under the background of energy conservation and emission reduction and green environmental protection,electric vehicles develop rapidly relying on the advantages of cleanliness,green and low energy consumption.Their output and proportion in the world automobile output are increasing year by year.At the same time,lightweight design of vehicles is also one of the effective ways to save energy and emission.The automobile drive axle is an important part of the vehicle transmission system,and the drive axle housing is one of the main components of the drive axle.The drive axle housing not only plays a supporting and protective role in vehicle operation,but also bears complex loads.Therefore,the research on the lightweight of the drive axle housing should be carried out on the basis that the axle housing meets the requirements of strength,stiffness,vibration characteristics and fatigue life,and its working performance cannot be affected.The research contents mainly include:(1)The basic parameters and dynamic parameters of the electric vehicle studied are introduced.The geometric model and finite element model of automobile drive axle housing are established.In the process of model establishment,it is necessary to make appropriate simplification to improve the efficiency and accuracy of simulation analysis.(2)In order to carry out the simulation analysis,four driving frames under typical working conditions were selected,and there was a certain amount of leisure in each working condition to meet the requirements of rigid use.In the free state,the analysis of the natural frequencies from the 7th to 12th positions and the vibration of the secondary bridge shell shows that the natural frequencies from the 7th to the 12th positions are greater than the external excitation frequency,so that the drive axle Shell vehicle does not have resonance phenomenon when it is running normally.(3)The fatigue life of the drive axle housing is analyzed,and the fatigue life and fatigue damage nephogram of the axle housing under the condition of maximum vertical force are obtained.The results show that the minimum fatigue life of the axle housing is 2.864 million times,which is greater than the standard of 600000 times specified in QC/T 533-2020 commercial vehicle drive axle assembly.(4)The response surface method is used to analyze the lightweight of the drive axle housing.The mass of the optimized axle housing is 25.47kg,which is 10.9%lower than that before the optimization.The optimization result is obvious.Verify the optimized axle housing.The results show that the strength,stiffness,vibration characteristics and fatigue life of the optimized drive axle housing meet the requirements,and the optimization method is feasible.