Variable damping absorber

Abstract

The invention relates to a variable damping absorber. In the variable damping absorber, circular holes with specified numbers, positions and sizes are drilled on the working cylinder wall of an ordinary dual-cylindrical hydraulic absorber for the conventional passive suspension and are separated from environment outside the working cylinder, and the area of a channel through which oil in the absorber flows in the working process under different working conditions is changed to fulfill the aim of changing the damping force of recover stroke and compression stroke. Bench tests and loading road tests prove that the absorber has the excellent performance and stable damping characteristic. According to the condition of the machined holes, the absorber can produce 2 to 5 levels of damping force, and once the absorber is designed, the damping force can be provided automatically according to the vibrating amplitude of vehicle bodies without arranging a damp regulating mechanism and a control mechanism additionally, so the absorber has a simple structure and low cost, is easy to manufacture, and has the high practical value. The variable damping absorber can be applied to semiactive suspension systems, seats of drivers and vibration isolation and vibration attenuation of driving cabs in various vehicles.

Description

technical field [0001] The invention belongs to a vehicle shock absorber, in particular to a variable damping shock absorber. Background technique [0002] Shock absorber is an important part of the car, and its performance directly affects the comfort, handling stability and safety of the car. At present, all kinds of domestic cars, including imported technology or various types of cars produced by Sino-foreign joint ventures, such as Santana, Audi, Fukang, Buick, etc., basically use traditional shock absorbers with invariable damping, so it is difficult to adapt to different roads. and usage status. Domestically, there have been patent applications for variable (or adjustable) damping shock absorbers that can adapt to different roads and usage conditions. For example, the application number is 91201256.0, which discloses an adjustable damping shock absorber, but this patent will stepper motors It is installed in the dust cover, so that the required installation space is ...

AI Technical Summary

Problems solved by technology

Domestically, there have been patent applications for variable (or adjustable) damping shock absorbers that can adapt to different roads and usage conditions. For example, the application number is 91201256.0, which discloses an adjustable damping shock absorber, but this patent will stepper motors It is installed in the dust cover, which requires a large installation space. The stepper motor is placed in a vibrating environment for a long time, and its life is short, and the hollow piston rod is used, which is difficult to manufacture and has low mechanical strength.

Another example is that the application number is 99217931.9, which announces a built-in solenoid valve type three-stage adjustable damping shock absorber. In this patent, the solenoid valve is placed horizontally in the middle of the piston, so that the installation space is relatively large, and the hollow piston rod is adopted. Its manufacturing More difficult, low mechanical strength, and its piston structure is more complicated, and the manufacturing cost is relatively high

There is also the magneto-rheological intelligent shock absorber for miniature cars announced as application number 200510060298.6, which needs to control the viscosity of the damping oil by changing the current size of the energized coil, so that the damping of the shock absorber is variable, but the magnetorheological fluid It is easy to precipitate, and the original magnetic field effect will not be eliminated immediately after the power is cut off or the current is changed. In addition, the shock absorber has relatively long response time and high cost.

In short, from the structure and working principle of the above three variable (or adjustable) damping shock absorbers, they all need to be equipped with damping adjustment mechanisms and control mechanisms, and their structures are complex, costly, and difficult to manufacture.

Therefore, variable (or adjustable) damping shock absorbers have not been successfully applied to real vehicles in China. Therefore, a variable damping shock absorber with relatively high cost performance and suitable for semi-active suspensions of ordinary automobiles has been developed. It is of great significance to promote the progress of my country's semi-active suspension technology and the application of real vehicles

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