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    In the suspension system, the elastic element is shocked to produce a sensation. In order to improve the ride comfort of the car, a shock absorber is installed in parallel with the elastic element in the suspension to attenuate the sensation. The shock absorber used in the car suspension system is mostly hydraulic shock absorber. The operating principle of the shock absorber is that when the frame (or body) and the axle make a sensation and relative movement occurs, the piston in the shock absorber moves up and down, and the oil in the shock absorber cavity repeatedly passes through different chambers. The pore flows into another cavity. At this moment, the conflict between the hole wall and the oil and the internal conflict between the oil molecules form a damping force on the sensation, so that the sensational energy of the car is converted into oil heat, which is then absorbed by the shock absorber and emitted into the atmosphere. When the oil channel section and other elements remain unchanged, the damping force increases or decreases with the relative movement speed between the frame and the axle (or wheel), and is related to the oil viscosity.

    The shock absorber and the elastic element undertake the task of buffering and damping shock. If the damping force is too large, the elasticity of the suspension will be deteriorated, and even the shock absorber connector will be damaged. Therefore, the opposition between the elastic element and the shock absorber must be adjusted.


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