Lightweight Design And Analysis Of New Electric Wheels

As a new driving mode of electric vehicle,the electric wheel system plays an important role in the layout of the whole structure of electric vehicle and the optimization of the driving control system.But the application of electric drive wheels will introduce the mass of motor and other components into the under-spring mass,which will greatly increase the under-spring mass of automobiles.That will worsen the driving safety of the whole vehicle,and affect the application and promotion of electric drive technology in the field of electric vehicles.In this paper,a new structure of un-spring mass lightweight electric driving wheel is designed.The main research contents are as follows:(1)The lightweight design methods common,ly used in engineering are explored.The lightweight design of electric drive wheels is carried out by three methods:function lightweight,material lightweight and structure lightweight.According to the method of lightweight function,a suspension system integrated electric drive wheel with under-spring mass transfer structure is obtained.The mass of motor,motor bracket,transmission device and cantilever in the structure is completely converted to the spring mass.The design reduces the under-spring mass of the electric driving wheel from 86.7 kg to 47.5 kg,and the under-spring mass of the electric driving wheel can be reduced by 45.2%.(2)The 7005 ultra-high strength aluminum alloy manufactured by rapid cooling technology was selected as the lightweight replacement material for the electric drive wheel.The under-spring mass was further reduced to 40.3 kg,and the weight reduction ratio of under-spring mass was 53.5%.The design Exploration module of ANSYS Workbench software is used to optimize the size of parts.On the basis of un-spring mass transfer and material lightweight,the un-spring mass of electric drive wheel is reduced by 0.65 kg again.After dimension optimization,the un-spring mass of the designed electrie drive wheels is reduced to 39.6 kg,and the weight reduction ratio reaches 54.3%.(3)The influence of the lightweight design of the spring mass on the dynamic performance of the vehicle is verified by the dynamic simulation analysis method.The simulation results of wheel dynamic displacement show that when the vehicle speed is over 40 km/h,the dynamic load of the lightweight electric driving wheel with un-spring mass lightweight design decreases obviously.The grounding performance and ride stability of the wheel are greatly improved,and the operation stability and driving safety of the vehicle are improved.