Pumping system
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United States of America Patent
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Dec 10, 2013
Grant Date -
Mar 20, 2008
app pub date -
Jan 5, 2005
filing date -
Jan 9, 2004
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Abstract
A pumping system having a pump, such as a variable-displacement vane pump or a gear pump. The pump in turn has hydraulic pressure-control dissipating devices for imparting to the oil in a first control chamber a pressure lower than the pressure of a second chamber. The system is characterized in that the first control chamber of the pump has a channel connecting the first control chamber to an oil inlet. And the channel has an opening/closing device controlled selectively by an engine operating parameter, such as oil temperature.
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