In the uneven road, although the shock absorption spring can filter the vibration of the road, but the rear gas shock absorber spring itself will also have reciprocating motion, and the shock absorber is used to inhibit this spring jump. The stiffness of the air spring shock absorber can be selected according to the need by changing the volume of the additional air chamber, and can be selected very low. The same air spring, can bear axial and radial load at the same time, but also can transfer torque, and through the adjustment of internal pressure, but also can get different carrying capacity, so it can adapt to the needs of a variety of loads. Renault traffic shock absorber USES air springs can be roughly divided into free film type, hybrid, and capsule type air spring sleeve type, its structure and tubeless tyre rubber capsule, by inside rubber (air layer), rubber, fabric reinforced layer and steel wire circle, its load is mainly composed of cord, cord material is air spring pressure resistance and durability of the decisive factor, The general use of high strength polyester cord or nylon cord, cord layer number is generally 2 or 4 layers, layers crossed and the direction of the capsule into an Angle arrangement. Compared with metal spring, it has the advantages of small mass, good comfort, fatigue resistance, long service life and so on. It also has the effect of shock absorption and noise elimination.