Electroactive fluid torque transmission apparatus with ferroflui

Details Electroactive fluid torque transmission apparatus with ferroflui Electroactive fluid torque transmission apparatus with ferroflui

1990-04-03

1991-04-16

Lorence, Richard

192 clutches and power-stop control

Field responsive frictional media type

277 80, 277135, 252 6252, F16D 3702, F16J 1540

Patent

active

050075136

ABSTRACT:
An apparatus for controlling the transmission of torque between drive elements using an electroactive fluid which is sealed within an enclosed chamber. A housing defines the chamber and includes at least one end defining an opening. Spaced electrodes are provided in the chamber in contact with the fluid and are respectively connected to the drive elements. A controllable power source applies a variable electric field to the fluid such that force is transmitted between the electrodes by the fluid according to the strength of the field. A shaft connects one of the electrodes to one of the elements and extends through the opening. A ferrofluid seal assembly prevents leakage of the fluid from the chamber through the opening. The assembly defines with the shaft an annular space in communication with the fluid. A magnetic circuit is provided in the assembly by a permanent magnet for applying a concentrated magnetic field in one or more regions across the annular space. A ferrofluid which is immiscible with the electroactive fluid occupies the regions as though it were a liquid O-ring, thus sealing the fluid within the chamber both when the shaft is stationary and when rotating.

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