A gap fine-tuning magneto-rheological clutch

Abstract

The invention discloses a gap fine adjustment type magnetorheological clutch which comprises an input shaft, an output shaft, an inner disc, a left outer disc, a right outer disc, a left shell, a right shell and an electromagnetic coil. The right shell, the left outer disc, the inner disc and the right outer disc form a main magnetic circuit in a surrounding manner, and the left shell is made of non-magnetic-permeability materials and is arranged on the outside of the main magnetic circuit; the inner disc and the outer discs are attracted to one another by the aid of a magnetic field generated by currents which are applied into the electromagnetic coil when the clutch works, so that gaps among the discs can be automatically adjusted; the left outer disc is of a blind hole structure, and convex teeth on the circumference of the left outer disc are matched with grooves in a non-magnetic ring, so that the left outer disc can axially move rightwards, and a space between the left outer disc and the non-magnetic ring can be safely sealed by the aid of a magnetorheological sealing device. The gap fine adjustment type magnetorheological clutch has the advantages that the clutch can be sealed safely and is compact in structure and free of electric brushes, optional rotational speeds can be outputted by the aid of an active control mode, and accordingly speeds can be regulated from zero in a stepless manner under a high-slip condition.

Description

technical field [0001] The invention relates to a magneto-rheological clutch, in particular to a gap fine-tuning magneto-rheological clutch capable of realizing stepless speed regulation when working at a large slip speed. Background technique [0002] In recent years, many domestic scholars have paid great attention to the magneto-rheological clutch transmission and carried out many studies. The radial self-pressurization and centrifugal magneto-rheological clutches developed by Huazhong University of Science and Technology adjust the output torque of the magneto-rheological clutch in the form of a fixed curve and by changing the gap value respectively, but they can only be adjusted passively and cannot achieve arbitrary active control. has limitations. The China University of Mining and Technology designed a double-disc clutch for the application of small load torque speed regulation. The fatal problem is that the seal is located on the large circumference, and the magnet...

AI Technical Summary

Problems solved by technology

Since the device uses permanent magnets, its output torque can only be adjusted passively through the disc gap according to the temperature, and its application range is limited, and its conical section takes up a lot of space and consumes magnetorheological fluid

[0004] The common problem in the above design of magneto-rheological clutches is that the output torque range is not wide enough due to the non-adjustable value of the gap between the driving and driven discs as a fixed structural parameter.

If the gap value is small, at a large slip speed (high shear rate), due to the existence of liquid viscous force, the complete detachment of zero torque output cannot be achieved; if the gap value is large, the magnetic field strength in the working gap will decrease , so that a larger output torque cannot be obtained

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