Modulated viscous fan drive

Details Modulated viscous fan drive Modulated viscous fan drive

F - Mech Eng,Light,Heat,Weapons

16

D

123/155

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

Patent

CA 1176522

ABSTRACT A shear fluid, temperature responsive fan drive coupling for the radiator cooling fan of an internal combustion engine. The drive coupling, con- ventionally, carries a temperature responsive valve which controls the degree of rotary coupling between the engine and the radiator cooling fan by controlling the quantity of shear fluid between a driving disc and a driven housing carrying the fan. The disc and the housing are parts of the coupling. The specific im- provement of this invention relates to the provision of accumulator grooves in -the walls of the drive chamber. These grooves allow an increase in the volume of shear (torque-transmitting) liquid in the coupling. The coupling exhibits modulated torque transmitting action in passing from partial to full engagement as tempera- ture is varied.

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