Viscous fluid shear clutches and control valves therefor

Details Viscous fluid shear clutches and control valves therefor Viscous fluid shear clutches and control valves therefor

F - Mech Eng,Light,Heat,Weapons

16

D

192/11, 192/12

F16D 25/00 (2006.01) F16D 35/02 (2006.01)

Patent

CA 2007135

ABSTRACT VISCOUS FLUID SHEAR CLUTCHES AND CONTROL VALVES THEREFOR A viscous fluid shear clutch comprises a two-part outer casing 14,15 and an inner clutch member 10 between which is defined a clearance gap into which viscous fluid may flow to provide an adjustable degree of coupling between the casing and the clutch members. Fluid is continually pumped out of the gap by a circumferential scoop pummp. The clutch may be assembled for reverse operation by indexing the casing parts relative to one another. The quantity of fluid in the gap may be controlled dependent on sensed temperature and sensed speed or sensed temperature alone. A thermo pressure valve provides a pressure force related to the sensed temperature; this relationship may be inverse for failsafe operation.

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