Novel hydro-pneumatic spring

Abstract

The invention discloses a novel hydro-pneumatic spring. An upper hemisphere chamber is arranged in an inner cavity of an upper lifting ring fixing device, a rubber oil-gas membrane is arranged in an upper port of a working cylinder barrel, a hermetic high pressure gas chamber filled with high pressure gas is formed by the upper hemisphere chamber and the rubber oil-gas membrane, a hermetic rodlesscavity is defined by the rubber oil-gas membrane, the inner wall of the working cylinder barrel and a piston located below the rubber oil-gas membrane, an annular cavity is defined by the piston, a piston rod outer wall, the inner wall of the working cylinder barrel and the lower wall of the working cylinder barrel, and a gas bag and a damping valve are arranged in an inner cavity of the piston rod. The side wall of the damping valve is provided with four second trapezoid through holes evenly distributed in the radial direction, the side wall of the piston rod is provided with four first trapezoid holes evenly distributed in the radial direction and located in the same radial positions as the second trapezoid through holes, the pressure difference is produced between the pressure intensity of gas in the gas bag and the pressure intensity of liquid in the annular cavity, the gas bag is compressed or expanded, the throttling hole area is constantly changed, vehicle smoothness can be enhanced, and the service life of the hydro-pneumatic spring can be prolonged.

Description

technical field [0001] The invention relates to the field of automobile suspension systems, in particular to an oil-pneumatic spring with variable damping. Background technique [0002] In the automobile suspension system, the oil-gas spring is a suspension elastic damping element with excellent performance. It is the core part of the oil-gas suspension. It has both damping characteristics and nonlinear stiffness characteristics. The flow resistance of the oil is used to achieve vibration reduction, while the incompressibility of the oil is used to achieve more accurate motion and force transmission. The oil-pneumatic spring has the characteristic of variable stiffness, so that the vehicle equipped with the oil-pneumatic suspension can obtain a lower natural vibration frequency, thereby improving the driver's working conditions and increasing the average speed, and the oil-pneumatic spring can also realize the adjustment of the vehicle body height. [0003] Existing oil-gas...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the oil-gas spring in the prior art that the metal valve plate is easily fatigued and damaged under heavy loads and the movement of the damping valve is easily affected by the movement of the oil, and provides a new type of oil-gas spring with variable damping of the solid valve type. Spring, using a rigid valve body to replace the traditional orifice metal valve plate, using the air bag as the elastic element of the damping valve to drive the damping valve to move up and down

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