In order to reduce the vibration and impact of the road on the vehicle mentioned above, the tension spring is required to absorb the energy of vibration and impact. The tension spring is an energy storage element in the suspension, but it is not enough to temporarily store it. These energy consumptions that are unfavorable to the ride comfort and handling stability of the vehicle are consumed. This is the turn of the shock absorber. The working principle of the hydraulic shock absorber is that when the frame and the axle move back and forth relative to each other, and the piston When the cylinder reciprocates, the oil in the shock absorber shell repeatedly flows from one cavity through some narrow pores into another cavity. At this moment, the conflict between the hole wall and the oil and the conflict between the liquid molecules are It forms a damping force against vibration, so that the vibration energy of the vehicle body and the frame is converted into heat energy, which is absorbed by the oil and the shock absorber shell, and then dispersed into the atmosphere. In short, it converts kinetic energy into heat. If the shock absorber works continuously for several minutes on the test bench, the outer wall of the shock absorber storage cylinder will become very hot and even tricky.