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Coil spring is made of spring steel, can be made of constant stiffness of equal pitch or variable stiffness of variable pitch. Coil springs vary in wire thickness, number of coils and their density. A shock absorber is built into the spring, so that the body is separated from the road in some way and the car moves more smoothly on the road.

The spiral spring itself has no shock absorption effect, only has the buffer effect, so in the spiral spring suspension must be equipped with shock absorber. The combination of spiral spring and shock absorber is a great combination to make full use of their characteristics, can timely buffer the impact on the bottom, and drag the shock absorber piston in the spiral spring several back and forth process, drive the oil to absorb most of the energy, making the car quickly smooth down. Shock absorbers are used in conjunction with helical springs, mainly to alleviate the shock brought by the spring in the cushioning process, providing better comfort.

The automotive suspension system consists of three basic components: coil springs, damping components and guide components. The most important one is the steel auto coil spring. Made of thick steel wire, they are simple in structure and can be formed into the proper shape. Steel auto coil springs vary in wire thickness, number of coils and their density. A shock absorber is built into the spring, so that the body is separated from the road in some way and the car moves more smoothly on the road.