Gas spring is an industrial accessory that can support, cushion, brake, height adjustment and angle adjustment.

The principle is to fill the closed pressure cylinder with inert gas or oil-gas mixture to make the pressure in the cavity several times or dozens of times higher than the atmospheric pressure, and realize the movement of the piston rod by using the pressure difference generated by the cross-sectional area of the piston rod is less than the cross-sectional area of the piston.

Passenger cars mainly use compressed gas springs , which mainly play a supporting role.