A liquid pressure-regulated and speed-dependent dry friction shock absorber

Abstract

The invention discloses a liquid pressure-regulated and velocity-dependent dry friction shock absorber for a vehicle, and aims at overcoming the shortage of restriction to damping force generation of a small-diameter shock absorber in the prior art. The liquid pressure-regulated and velocity-dependent dry friction shock absorber comprises an upper motor unit, an upper mounting fixing unit, a fixed piston unit, a main piston unit, a working cylinder barrel unit, a frictional cylinder barrel unit, a lower mounting fixing unit, and a lower motor unit; the upper motor unit is fixed on the upper mounting fixing unit by means of a screw; the upper mounting fixing unit is in threaded connection to an upper end of the working cylinder barrel unit; the fixed piston unit and the main piston unit are mounted within the working cylinder barrel unit; the upper motor unit is in key connection with the fixed piston unit, while the lower motor unit is in threaded connection with the main piston unit; the main piston unit is capable of moving up and down along the working cylinder barrel; the frictional cylinder barrel unit sleeves the working cylinder barrel unit, and the lower mounting fixing unit is welded on a lower end of the frictional cylinder barrel unit.

Description

technical field [0001] The present invention relates to a shock absorber, and more particularly to a fluid-regulated, speed-dependent dry friction shock absorber for vehicles. Background technique [0002] In the modern automobile structure, the suspension is an essential system of the vehicle, it is a necessary structure connecting the body and the wheels. Shock absorbers and springs are extremely important components that transmit and generate force in a suspension. Among them, the spring is responsible for alleviating the impact vibration of the road surface and improving the comfort of the vehicle, and the shock absorber is responsible for converting the vibration energy of the vehicle into heat energy for attenuation. Both of them play a vital role in improving the ride comfort of the vehicle. [0003] As an important part of the automobile chassis, the shock absorber plays an extremely important role in isolating and attenuating the vibration excitation of the road to...

AI Technical Summary

Problems solved by technology

[0005] However, there are two disadvantages for the traditional reciprocating piston hydraulic shock absorber. First, since the damping force depends on the pressure difference formed at both ends of the piston, the damping force that the shock absorber can generate is directly related to the area of ​​the piston. For small Diameter shock absorbers, the conditions of use of their sealing elements will limit the range of damping forces they can generate

At the same time, excessively reducing the cross-sectional area of ​​the oil channel in order to generate a large damping force may lead to unstable liquid flow and foaming

Secondly, for the most common double cylinder shock absorber, since the main piston is placed in the innermost cylinder, the heat dissipation condition deteriorates, thus affecting the cooling effect

[0006] For example, Chinese patent announcement number CN102032308A, announcement date 2011.04.27, application number 201010552262.0, application date 2010.11.19, the applicant Chongqing University, the name is "variable damping shock absorber", the variable damping described in the technical solution of this application Although the shock absorber is simple in structure, low in cost and easy to manufacture, the shock absorber is based on the traditional double-barrel shock absorber, and its vibration reduction principle is still to consume the energy of body vibration through the resistance of oil flow.

The resistance of the oil flow is limited by the pressure in the cylinder and the cross-sectional area of ​​the oil channel, and the shock absorber is the same as the traditional double-tube shock absorber. The main piston is placed in the innermost cylinder, which leads to deterioration of heat dissipation conditions, thus Affect cooling effect

[0007] For example, Chinese Patent Publication No. CN1246174A, announcement date 2000.03.1, application number 97181757, application date 1997.1.8, applicant Italy Spring AG, titled "Friction Damper for Washing Machine or Similar", the friction damper of this application The shock absorber has less wear and tear, and has a longer life than the ordinary friction shock absorber, and the noise is very small, but the shock absorber consumes energy through friction, and the energy consumption has nothing to do with the vibration speed of the shock absorber, so it cannot Timely change energy consumption according to the speed of vibration

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