Variable displacement lubricant pump with a pressure control valve having a preload control arrangement
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United States of America Patent
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Jul 19, 2016
Grant Date -
Jan 30, 2014
app pub date -
Feb 21, 2011
filing date -
Feb 21, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A lubricant pump for pumping a pressurized lubricant to an engine includes a shiftable control ring, a pump rotor, a pump outlet port, a pressure control system and a preload control arrangement. The pressure control system comprises a first pressure control chamber, a first pressure conduit connecting the pump outlet port with the first pressure control chamber, and a pressure control valve. The pressure control valve comprises an outlet port, a control valve cylinder wall comprising a control port connected with the outlet port, a control plunger which opens and closes the control port, an input pressure plunger connected with the control plunger, and a control spring preloading the control plunger into a closed position. The preload control arrangement comprises a preload cylinder, a preload plunger in the preload cylinder supporting a basis of the control spring, a preload cylinder inlet, and a preload control valve controlling a lubricant pressure.
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