A multi-stage controllable variable damping shock absorber

Abstract

The invention relates to a multistage controllable variable damping absorber which comprises a working cylinder and a floating piston located in the working cylinder. The working cylinder is divided into a closed air chamber filled with high pressure gas and a fluid cavity accommodating a magnetorheological fluid as a working fluid by the floating piston. A working piston with a hollow cavity is formed in the cavity accommodating the magnetorheological fluid as the working fluid, an annular slot is formed in the side wall of the working piston, and a magnet exciting coil winds in the annular slot; a pretightening force control rotor is arranged in the hollow cavity of the working piston, a plurality of rebound valves and compression valves are symmetrically distributed on the upper part of the working piston, pre-tightening springs with different pre-tightening forces are mounted on the rebound valves and compression valves, a flow control plate is arranged at the lower end of the working piston, circulating holes with different pore diameters are formed in the flow control plate, and two channels are arranged in the pre-tightening force control rotor for connecting the rebound valves and compression valves with different pre-tightening forces to the circulating holes with different pore diameters.

Description

technical field [0001] The invention belongs to the field of dampers and intelligent materials, in particular to a magnetorheological fluid shock absorber with multi-stage adjustable rotary damping force. Background technique [0002] Mechanical vibration is ubiquitous in various power machinery and mechanical products. Vibration can cause damage to mechanical parts, affect the working effect of precision instruments, and even have adverse effects on the human body. In the fields of aviation, aerospace, machinery, construction, precision instruments, etc., vibration dampers are mainly used to eliminate the adverse effects of vibration. At present, the types of shock absorbers can be divided into passive control type, active control type and semi-active control type according to the control method. [0003] The passive shock absorber is composed of a spring and a shock absorber. Once its performance parameter stiffness and damping coefficient are determined, it cannot be cha...

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Problems solved by technology

[0005] Although magnetorheological fluid shock absorbers are widely used in the fields of automobile suspension, construction, and bridge vibration reduction due to their simple structure, low energy consumption, adjustable output damping force, and rapid response, there are still Some problems need to be solved: Most of the magnetorheological fluid shock absorbers used at this stage belong to the piston gap flow mode. This kind of magnetorheological shock absorber has a narrow adjustable range of damping force, a small magnetic field action area, and the magnetorheological fluid Disadvantages such as low utilization rate, the range of damping force that can be provided is limited; and the damping force generated by the magneto-rheological fluid shock absorber is very small at low speed, especially when the speed is close to zero, so the car works at low speed on non-paved roads Or when cornering at low speed, it cannot provide enough damping force, which affects the handling stability and smoothness of the car

In order to obtain a greater output damping force, the traditional solution is to increase the length of the damping gap, but this method will make the volume of the magneto-rheological shock absorber larger

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