The rear axle of an automobile is one of the important components of the automobile chassis, and it is a key component that affects the bearing capacity, smooth running, and dynamic performance of the automobile. In addition, the rear axle of the car also bears the vertical, longitudinal and lateral forces acting on the road surface and the frame or body.

The design of the rear axle assembly of the vehicle should meet the following basic requirements:

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

2. The size and quality of the rear axle of the car should be small, but the necessary ground clearance should be guaranteed;

3. Gears and other transmission parts work smoothly with low noise;

4. High transmission efficiency under various speeds and loads;

5. Under the condition of ensuring sufficient strength and stiffness, the mass of the rear axle of the car should be as small as possible, especially the unsprung mass to improve the ride comfort of the car;

6. Coordinate with the movement of the suspension guide mechanism;

7. The service life should be long, the structure should be simple, the structural performance should meet the requirements of use, the manufacture is convenient, and the maintenance is easy;

8. The production process and quality of the rear axle of the automobile must meet the corresponding standards and regulations of the automobile industry.