He Xie Gas Spring speed is relatively slow, the dynamic force change is not large (usually within 1:1.2), easy to control; the disadvantage is that the relative volume is small, the cost is high, and the life is relatively short. Different from the mechanical spring, the air spring has a nearly linear elastic curve. The elastic coefficient X of the standard gas spring is between 1.2 and 1.4, and the other parameters can be defined according to the requirement and working conditions.