Dual stage engagement for viscous fluid coupling

Details Dual stage engagement for viscous fluid coupling Dual stage engagement for viscous fluid coupling

F - Mech Eng,Light,Heat,Weapons

16

D

123/157

F16D 35/00 (2006.01) F01P 7/04 (2006.01) F16D 35/02 (2006.01)

Patent

CA 1182008

ABSTRACT OF THE DISCLOSURE A viscous fan clutch (10) is typically employed in a fan drive mechanism within a truck or automobile. A shaft (12) driven by the engine, rotates a clutch member (24) within the fan drive. The clutch member is arranged for fluid engagement with a cover assembly (38) for the transmission of torque thereto when the fluid is disposed in an operating chamber (70) defined by complementary shear surfaces (30, 31, 56, and 57) in the clutch and cover. During relative rotation between the clutch and cover, fluid is pumped from the operating chamber to primary (76) and secondary (77) fluid storage chambers. Independent fluid temperature responsive control valves (120 and 190) provide for selective communication between the storage chambers and the operating chamber to effect modulation of the total fluid flow whereby dual speed operation of the clutch is achieved. In the preferred embodiment, one of the valves operates in response to impinging ambient air at a relatively low temperature and the other valve operates in response to sensed engine coolant temperature at a relatively high temperature.

391548

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