The role of the suspension is to connect the axle and the frame elastically, and use it to absorb and moderate the impact and vibration transmitted to the frame due to road surface unevenness caused by wheel hopping; to maintain the frame and the wheels between the correct relationship between the movement of the car so as to ensure that the car's driving smoothness and maneuvering stability; to transfer the road surface acting on the wheels of the support force, driving force, braking force and lateral force and the torque generated by the car.
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