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Shock absorber and elastic components undertake the task of cushioning impact and damping, damping force is too large, will make the suspension elasticity deteriorates, even damage the shock absorber connector. Due to the surface to adjust the elastic element and shock absorber this contradiction. (1) In the compression stroke (bridge and frame close to each other), the damping force of the shock absorber is small, so as to give full play to the elastic role of the elastic elements and mitigate the impact. At this point, the elastic element plays a major role. (2) In the suspension stretch travel (the bridge and the frame are far away from each other), the damping force of the shock absorber should be large to reduce the vibration quickly. (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 liquid flow, so that the damping force is always kept within a certain limit, so as to avoid bearing too large impact load.