The shape of the Truck Rear Shock Absorber is a shaft cylinder in which there is a movable shaft cylinder or a shaft rod. The shock absorber is located inside the suspension spring and is generally connected to the carriage and wheel carrier. The principle of pneumatic or hydraulic shock absorption is much the same. In the design and application of shock absorbers, the following factors need to be considered: the ability to provide the required amount of vibration isolation; Able to bear the specified load; Can withstand temperature and other environmental conditions (humidity, corrosive fluid, etc.) change; Has a certain vibration isolation characteristics; It can meet the requirements of weight and volume of vibration isolator for equipment using vibration isolator. Air adjustable shock absorbers are not used to support the weight of the car, but to suppress the shock of the spring after the rebound and absorb the energy of the road impact. The spring moderates the impact, changing the "large energy one-time impact" into "small energy multiple impact", and the shock absorber is gradually reducing the "small energy multiple impact".