Automobile driving axle is one of the important parts of automobile chassis, affecting automobile bearing capacity, stable operation, power performance of the key components, such as, at the end of the drive train, and its basic function is to increase the shaft or transmission of torque, and reasonable distribution of will power to the left and right driving wheels, car rear axle also inherit the role between road surface and frame or body of vertical force and vertical force and horizontal force.

The design of automobile rear axle assembly shall meet the following basic requirements:

1. The selected main deceleration ratio should ensure that the vehicle has the best power performance and fuel economy;

2. The exterior size and quality of the rear axle should be small, but necessary off-ground clearance should be ensured;

3, gear and other transmission parts work smoothly, low noise;

4, in a variety of speed and load with high transmission efficiency;

5. Under the condition of sufficient strength and stiffness, the quality of the rear axle should be as small as possible, especially the unsprung mass, to improve the smoothness of the automobile;

6. Coordinate with the movement of suspension guiding mechanism;

7, long service life, simple structure, structure performance should meet the requirements, easy to manufacture, easy maintenance, etc.;

8. The manufacturing technology and quality of the rear axle must meet the requirements of relevant standards and regulations in the automobile industry.