Novel hydro-pneumatic spring

Abstract

The invention discloses a novel hydro-pneumatic spring. An upper semispherical chamber is arranged in an inner cavity of an upper hoisting ring fixing device, a rubber hydro-pneumatic diaphragm is arranged at the upper opening of a working cylinder, a sealed high-pressure air chamber inflated with high-pressure air is formed by the upper semispherical chamber and the rubber hydro-pneumatic diaphragm, a closed rodless cavity is defined by the rubber hydro-pneumatic diaphragm, the inner wall of the working cylinder and a piston located under the rubber hydro-pneumatic diaphragm, an annular cavity is defined by the piston, the outer wall of a piston rod, the inner wall of the working cylinder and the lower wall, an air bag and a damping valve are arranged in an inner cavity of the piston rod, four second trapezoid through holes evenly distributed in the radial direction are formed in the lateral wall of the damping valve, and four first trapezoid through holes which are evenly distributed in the radial direction and are in the same radial positions as the four second trapezoid through holes are formed in the lateral wall of the piston rod. Pressure difference is generated between the pressure of the air in the air bag and the pressure of liquid in the annular cavity, the air bag is pressed or expands, continuous variation of the area of a throttling hole is achieved, the smoothness of a car can be improved, and the service life of the hydro-pneumatic spring is 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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