Water pump with electronically controlled viscous coupling drive
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United States of America Patent
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Nov 19, 2002
Grant Date -
N/A
app pub date -
Jun 19, 2001
filing date -
Jun 19, 2001
priority date (Note) -
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Abstract
An electronically-controlled viscous coupling is coupled to a water pump to control the coolant flow rate of engine coolant to an engine to maximize fuel economy and minimize emissions while preventing pump cavitation and possible water pump damage. The viscous coupling controls the rotational speed of a water pump shaft that is used for moving engine coolant through a cooling system as a function of engine speed and engine temperature. The viscous coupling has a stationary electrical coil that, when excited by electrical current, closes valve members which prevent the viscous fluid from entering the working chamber, thereby preventing the creation of torque to drive the water pump shaft.
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