1, support the full weight of the vehicle, bear the load of the car, and pass the other direction of the force and torque;

2, the transfer of traction and braking torque, to ensure that there is a good adhesion between the wheels and the road, to improve the car's power, braking and through; with the car suspension to ease the impact of the car driving, and to attenuate the vibration caused by this;

3, to prevent the automobile parts by severe vibration and early damage, to adapt to the high speed performance of the vehicle and reduce the noise, ensure the safety of driving, handling stability, comfort and energy saving.