Inclusion of an anti-drain valve in viscous fan clutches
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United States of America Patent
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Oct 13, 2009
Grant Date -
N/A
app pub date -
Feb 6, 2006
filing date -
Feb 6, 2006
priority date (Note) -
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Abstract
A viscous fluid clutch assembly used in automobiles, SUVs, and trucks minimizes flow back of the cooling fluid from the reservoir towards the working chamber of the clutch when the vehicle is at rest and avoids excessive fan noise, wasted power and fuel inefficiency when a cold automobile engine is started. The clutch utilizes a discharge channel extending from the periphery of the working chamber to the reservoir and a specially designed ball check valve at the entrance to the reservoir which is open or closed depending on operation of the vehicle. The ball check valve is fluidly connected to the working chamber of the fluid clutch by a preferred articulated discharge channel which starts at the working chamber of the fluid clutch and ends at the reservoir of the fluid clutch.
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