Magneto-rheological shock absorbers for rapid redispersion of settled particles

Abstract

The invention discloses a magnetorheological damper capable of achieving rapid redispersion of settling particles. The magnetorheological damper comprises a guiding base, a supporting base, a check bottom valve arranged on the supporting base, and a single-pass valve which is arranged on the guiding base and used for achieving switching related to strokes through piston movement, wherein the single-pass valve comprises a guiding belt; a sliding ring is arranged on a piston rod through the guiding belt so as to move along with a piston rod under the action of friction force between the guidingbelt and the piston rod; a through hole is formed in the part, leading to a compensation chamber, of the guiding base so as to be opened when the damper is compressed, and oil of a working cylinder upper cavity is extruded by the piston rod to enter the compensation chamber; and when the damper is in a stretching stroke, the sliding ring moves with the piston rod to close the through hole, pressure in the compensation chamber is higher than a working cylinder lower cavity, compensation oil enters a working cylinder through the check bottom valve, fluid impacts and stirs the lower cavity settling particles and dilutes lower cavity fluid. The settling affect is eliminated by the damper, and meanwhile, the radiating performance of the double cylinder damper is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to a magneto-rheological shock absorber capable of quickly redispersing sedimentation particles. Background technique [0002] Magneto-rheological semi-active suspension is the main development direction of advanced suspension, and a large number of tests have been carried out on off-road vehicles, especially military vehicles. Magnetorheological fluid is the key material of this technology, which is composed of carbonyl iron powder, synthetic oil and other additives. Due to the large density difference between components, sedimentation and stratification will inevitably occur after long-term standing. When used in vehicle suspension, the settlement problem causes the damping force of the shock absorber to be unstable, which affects the shock absorption effect; for the double-tube shock absorber, the damage caused by the blockage of the bottom valve is the main obstacle...

AI Technical Summary

Problems solved by technology

However, these measures also have adverse effects: excessive emphasis on settlement stability sacrifices the shear stress of magnetorheological fluid, and settlement stratification cannot be avoided; after canceling the bottom valve, it is necessary to fill the shock absorber with higher air pressure to reduce The service life of the shock absorber is shortened, and the problem of unstable damping force cannot be solved; while the scheme with the piston rod down will reduce the service life of the oil seal due to the action of iron powder abrasive particles in the magneto-rheological fluid.

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