Hot extrusion variable volume percentage bearing bush type magnetorheological fluid brake

Abstract

The invention discloses a hot extrusion variable volume percentage bearing bush type magnetorheological fluid brake. The hot extrusion variable volume percentage bearing bush type magnetorheological fluid brake comprises a brake shell, a brake shaft and a base; one part, in the brake shell, of the brake shaft is expanded to form a brake section; a magnet exciting coil and a magnetism isolating friction ring are arranged in a brake cylinder; an accommodating groove is formed in the brake section; a friction top block, a guide column and a shape memory alloy spring are arranged in the accommodating groove; a bearing bush is arranged on the external side of the brake section; a shaft hole is formed in the right end of the brake shaft; an oil guide hole is formed in the middle part of the brake section; the inner end of the oil guide hole communicates with the shaft hole; the middle part of the oil guide hole communicates with the accommodating groove; a filter is arranged at the outer endof the oil guide hole; the bearing bush is connected with the filter in a sliding fit manner; magnetorheological fluids are filled between the external wall of the bearing bush and the internal wallof the brake shell; and the shaft hole, the oil guide hole, a connecting hole and the accommodating groove are filled with silicone oil. The hot extrusion variable volume percentage bearing bush typemagnetorheological fluid brake has the advantages that the stability and reliability of the brake can be guaranteed in a high temperature environment, the braking performance can be guaranteed, and the braking effect can be improved.

Description

technical field [0001] The invention relates to the technical field of brakes, in particular to a magneto-rheological fluid brake of thermal extrusion volume percentage bearing pad type. Background technique [0002] Magnetorheological fluid is a kind of magnetic smart material, which is mainly composed of magnetic particles and base fluid (usually silicone oil), controlled by an external magnetic field, and exhibits the properties of Newtonian fluid when there is no external magnetic field; after adding a magnetic field, the magnetic The viscosity of the rheological fluid changes by several orders of magnitude, showing the properties of Bingham plastic fluid; the whole change process is rapid, reversible, and easy to operate. [0003] Based on the above properties of magnetorheological fluid, it has broad application prospects in the field of clutches and brakes; for example, "a magnetorheological brake" disclosed in Chinese patent CN103453053A uses an excitation coil for m...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to solve the problem that the existing magneto-rheological fluid brakes tend to degrade the performance of the magneto-rheological fluid in a high-temperature environment, resulting in poor brake stability and poor braking effect. Provides a thermal extrusion volume percentage bearing pad type magneto-rheological fluid brake, which can ensure the stability and reliability of the brake in a high-temperature environment, ensure the braking performance, and improve the braking effect

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