When the wheel moves relative to the frame, the working piston reciprocates in the oil, causing the oil pressure difference between the upper and lower chambers of the working piston, and then the pressure oil pushes the compression valve or the expansion valve to flow back and forth. Since the valve produces a large damping force on the pressure oil, the vibration is attenuated. The cylinder volume change caused by the presence of the piston rod is compensated by the up and down movement of the floating piston.
Resistance-adjustable shock absorber A piston is installed in the cylinder, and a hollow connecting rod is installed in the middle hole of the piston. The upper end of the hollow connecting rod is fixed on the lower shell of the air chamber, and a plunger rod and a plunger are also installed in the hollow connecting rod. The upper end of the plunger rod rests on the spring seat and the diaphragm. A spring is installed between the spring seat and the plunger rod. The lower end of the hollow connecting rod is provided with an orifice near the upper surface of the piston.