192 clutches and power-stop control – Field responsive frictional media type
Patent
1987-11-27
1989-03-14
Bonck, Rodney H.
192 clutches and power-stop control
Field responsive frictional media type
188267, F16D 3702
Patent
active
048118230
ABSTRACT:
A magnetic particle clutch is provided for use as a clutch or brake. The clutch is particularly useful in a helicopter steering subassembly. The clutch has an inner rotor and an outer drum with a common axis. The inner rotor has a shaft on which the outer drum is journaled. Between the inner rotor and the outer drum is a cylindrical working cavity, which contains magnetic powder. The outer drum has a peripheral coil and has exterior slip rings for actuating the coil. Axial flux lines caused by the actuated coil pass through the magnetic powder, causing a chain-like linking of particles of powder, which results in a shear force and torque between outer drum and inner rotor. In order to prevent shifting of the powder within the cylindrical cavity during tilting of the clutch, a series of conical and radial cavities are disposed at each end of the cylindrical cavity and connecting thereto. The conical and radial cavities at each end act like powder guides. Centrifugal force on the powder at clutch start-up distributes evenly the powder peripherally and axially along cylindrical cavity. Gravity forces on the powder during angular displacements of the clutch in a helicopter during flight do not easily displace the powder out of the cylindrical cavity. The clutch torque is proportional to coil current and is independent of clutch speed.
REFERENCES:
patent: 2605876 (1952-08-01), Becker
patent: 2840206 (1958-06-01), Logan
patent: 2886151 (1959-05-01), Winslow
patent: 2897931 (1959-08-01), Didszuns
patent: 2921657 (1960-01-01), Winther
patent: 3094202 (1963-06-01), Issler
Fink Richard A.
Raymond Bruce C.
Bonck Rodney H.
Honeywell Inc.
Terry Howard Paul
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