Multipath magnetic circuit magneto-rheological shock absorber with permanent magnet

Abstract

The invention discloses a multipath magnetic circuit magneto-rheological shock absorber with a permanent magnet. The multipath magnetic circuit magneto-rheological shock absorber comprises a cylinderblock, a piston rod, a magnetic core, magnetorheological fluid, a coil, a magnetizer and the permanent magnet. According to the multipath magnetic circuit magneto-rheological shock absorber, the coilis arranged outside the cylinder block, installation and dismantling of the coil are facilitated during daily maintenance. Meanwhile, heat generated by the electrified coil can be dissipated well without affecting the viscosity of the magnetorheological fluid. Accordingly, the service life of the shock absorber is prolonged. As the coil is arranged outside, the internal structure of the shock absorber is concise, the manufacturing difficulty is reduced, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the field, in particular to a multi-magnetic circuit magneto-rheological shock absorber with permanent magnets. Background technique [0002] The viscosity of magnetorheological fluid can change with the strength of the external magnetic field, and its main characteristics are fast, reversible and controllable. The magnetorheological shock absorber uses this characteristic to change the output damping force of the magnetorheological hydraulic mount by controlling the current in the excitation coil to change the magnetic field strength, so as to attenuate the vibration of the car. This process responds quickly, the process is continuous, reversible. [0003] In the current magneto-rheological shock absorber, the coil is mainly arranged in the circumferential groove of the piston, and the coil wire is led out of the shock absorber through the deep hole processed in the piston rod. Although this solution has a compact structure,...

AI Technical Summary

Problems solved by technology

Although this solution has a compact structure, the piston structure is too complicated, and the processing of the deep and long holes in the piston is difficult and the manufacturing cost is high, resulting in an expensive overall shock absorber

At the same time, because the friction will generate heat when the piston moves, and the coil will also generate heat, which will easily cause the heat to not be dissipated immediately in a short time to form heat accumulation, resulting in the temperature of the magnetorheological fluid being too high. The damping performance of magnetorheological fluids drops sharply

[0004] And because most of the current magneto-rheological shock absorbers use a single magnetic circuit, the damping force output by the shock absorber will drop when there is no electricity, and when the coil fails, the shock absorber will completely lose its effect

Therefore, in order to obtain a larger damping force, the length of the piston is usually increased, and then the length of the damping channel is increased to obtain a large damping force. Increased manufacturing costs

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