The presence of the fluid to a large extent permits a wear-free and low-friction sealing between piston and cylinder. Additionally, there is a possibility of providing the spring elements with an integrated hydraulic damper and a hydraulic level regulator. The hydro-pneumatic air spring with level control has the following characteristic:
Gas weight = const.
The significant relationships between the various parameters of a hydropneumatic spring is indicated in the figure.
As a result of the compression-dependent decrease of hth, the natural frequency of body oscillations increases with the increasing load.