Study On The Integration Of Electric Vehicle Motor Rear Axle

Under the background of environmental pollution and energy shortage,low-speed pure electric vehicles,as an important part of new energy vehicles,have incomparable advantages in short-distance travel and use in rural areas,and are deeply loved by consumers.But at present,the quality of vehicles produced by various manufacturers is uneven and the reliability is poor.As an important component of low-speed pure electric vehicle,the driving axle bears the main load of the vehicle,and its quality directly affects the reliability and quality of the vehicle.In order to improve the quality of low-speed electric vehicles and reduce the cost of production and manufacture,this paper integrates the design of driving rear axle of low-speed electric vehicles from the perspective of high-speed pure electric vehicle design and the vehicle design requirements of a low-speed electric vehicle manufacturer in Hebei Province.The main work of this paper is as follows:(1)According to the structure and characteristics of the low-speed pure electric vehicle,the driving rear axle structure suitable for the low-speed pure electric vehicle is determined.According to the selected driving rear axle structure,the parameters of the driving rear axle are designed combined with the relevant vehicle design parameters,and the three-dimensional modeling of the driving rear axle is carried out by using the three-dimensional software SolidWorks.(2)According to the matched vehicle parameters,the vehicle power simulation model is established by using the vehicle modeling software AVL Cruise.The vehicle power performance is simulated and analyzed to ensure that the matched vehicle parameters meet the vehicle design requirements.(3)The force acting on the driving rear axle is analyzed and the simulation boundary conditions of the driving rear axle are established.Then the stiffness and strength of axle housing,main reducer and half axle of driving axle are analyzed by using finite element analysis software ANSYS Workbench and gear transmission analysis software ROMAX.Meanwhile,the modal analysis of the axle housing and half axle is carried out to determine its natural frequency and avoid resonance with the ground.Finally,the fatigue life of axle housing,main reducer and half axle is simulated and analyzed by using the Fatigue Tool module in ANSYS Workbench.In order to ensure that the designed driving axle meets the requirements of use.(4)By optimizing the thickness of the drive rear axle housing,the drive axle housing designed by the paper is lightly optimized.The optimal result of the quality of the driven rear axle under the set constraints is that the axle housing loses 18%.Then,the finite element,modal and fatigue life of the driven rear axle housing after weight reduction are analyzed to ensure that the weight-optimized driving rear axle housing meets the design requirements and relevant regulations of the vehicle.