1.Purpose and significance

1.1 Research Background

Pure electric vehicles are currently the only vehicles in the world that can achieve zero emissions. Due to the requirements of environmental protection and the development of new materials and new technologies, the research and development of pure electric vehicles is a strategic choice to realize the leap-forward development of China's engineering technology, and an important choice for the sustainable development of China's automobile industry. For the development of new energy vehicles, China can seize this opportunity and vigorously study and develop electric vehicles. It is bound to hope to reach the world's advanced level in this field and form a new growth point for China's pillars .

The electric vehicle drive axle is an important part of the electric vehicle power train, which plays an important role in the smooth and efficient transmission of power to the hub. At the end of the entire power system, its basic functions are: 1. The engine torque transmitted from the universal joint transmission is transmitted to the drive wheels through the final drive, the differential, the half shaft, etc., to achieve a speed reduction. Torque; 2.through the main reducer bevel gear pair to change the direction of torque transmission; 3.through the differential to achieve differential action on both sides of the wheel, to ensure that the inner and outer wheels turn at different speeds; 4 through the axle housing and wheels to achieve load And the transmission of torque. The main components of the driving axle, such as the final reducer, the differential, the half shaft, and the driving axle case, have many different structures. For example, the main reducer is divided into a single-stage, two-stage, two-speed, wheel-side reducer, etc., and the half-axis also has a full-floating half-axis and a semi-floating half-axis. Therefore, in the case that our design goal is based on the 6t pure electric truck, the correct selection of the structure and parameters of the drive axle according to the different properties of the motor and the fuel engine has become the main problem that we need to study.

2. 研究的基本内容与方案

2.Basic content, objectives, technical solutions and measures to be adopted for research (design)

2.1 Basic content of research (design)

(1) According to the basic parameters of the vehicle, determine the basic parameters of the main components of the driving axle such as the final drive, the differential, the half shaft, and the drive axle housing;

(2) The main parameters of the components of the driving axle are calculated and intensity-summed;

(3) Physical modeling using CATIA software;

(4) Using ANSYS Workbench for modal simulation analysis and structural optimization;