Continuously variable fan drive clutch arrangement
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United States of America Patent
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-
Sep 16, 1997
Issued Date -
N/A
app pub date -
Sep 19, 1995
filing date -
Sep 18, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A clutch mechanism for a cooling fan of a size capable of fitting into the limited envelope available in an over-the-road diesel tractor. A compact housing has a belt drive input and an output connected to the fan hub. A wet clutch is included within the housing lubricated by oil from the engine lubrication system. The housing includes an internal positive displacement booster pump cooperating with a controllable valve in the oil return line to the engine sump. When it is desired to operate the clutch, the valve is controllably closed to restrict flow from the clutch mechanism to the engine sump line. The positive displacement pump thereupon causes an increase in pressure in a pressure chamber in the housing, which acts on an internal piston to translate the clutch in a continuously variable manner between engaged and disengaged conditions.
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