At this time, the friction between the hole wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vehicle vibration energy is converted into oil heat, which is then absorbed by the shock absorber and emitted into the atmosphere. When the oil channel cross-section and other factors 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 shock and damping. Excessive damping force will deteriorate the elasticity of the suspension and even damage the shock absorber connector. Because of the contradiction between adjusting the elastic element and the shock absorber.
(1) In the compression stroke (the axle and the frame are close to each other), the damping force of the shock absorber is small, so as to give full play to the elastic effect of the elastic element and alleviate the impact. At this time, the elastic element plays a major role.
(2) During the extension stroke of the suspension (the axle and the frame are far away from each other), the damping force of the shock absorber should be large and the vibration should be quickly reduced.
(3) When the relative speed between the axle (or wheel) and the axle is too large, the shock absorber is required to automatically increase the fluid flow, so that the damping force is always kept within a certain limit to avoid excessive impact Load.
In the automobile suspension system, the cylindrical shock absorber is widely used, and it can dampen the vibration in both compression and extension strokes. It is called a two-way-acting shock absorber. There is also a new type of shock absorber, which includes a gas-filled shock absorber. Vibrator and adjustable resistance shock absorber.