Modulated viscous fan drive

Details Modulated viscous fan drive Modulated viscous fan drive

1981-09-25

1984-04-10

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Fluent material

192 82T, 192 52, F16D 3500, F16D 4325

Patent

active

044415982

ABSTRACT:
A shear fluid, temperature responsive fan drive coupling for the radiator cooling fan of an internal combustion engine. The drive coupling, conventionally, 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 improvement 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 temperature is varied.

REFERENCES:
patent: 3059745 (1962-10-01), Tauschek
patent: 3191733 (1965-06-01), Weir
patent: 4007819 (1977-02-01), Maci

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