Variable flow water pump
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United States of America Patent
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Mar 6, 2007
Grant Date -
Jun 2, 2005
app pub date -
Jan 26, 2001
filing date -
Jan 26, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A variable flow water pump includes a housing having an impeller mounted on a rotatable shaft. The pump impeller has a plurality, of vanes fixed to a back plate or flange. A circumferentially surrounding shroud is axially movable within the housing and may move between an open position and a covering position to expose or surround the vane portions and therefore control the effective working capacity of the pump. The shroud is controlled by an actuator and shift fork arrangement that responds to sensor measurements of temperature and/or engine speed to supply a sufficient quantity of coolant tailored to the actual need of the engine and without unwanted power loss caused by excessive flow.
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