VARIABLE DISPLACEMENT LUBRICANT PUMP
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United States of America Patent
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Issued Date -
Sep 1, 2016
app pub date -
Oct 21, 2013
filing date -
Oct 21, 2013
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Abstract
A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine. The variable displacement lubricant pump includes a shiftable control ring, a pump rotor comprising a plurality of slidable vanes which rotate in the control ring, a hydraulic pressure control comprising a control chamber which comprises a lateral control chamber wall, and a control ring plunger shiftable along the lateral control chamber wall, a first eccentricity limiting opening arranged in the lateral control chamber wall, a second eccentricity limiting opening arranged in the lateral control chamber wall, and an eccentricity limiting control system which connects or disconnects the first eccentricity limiting opening and the second eccentricity limiting opening to atmospheric pressure dependent on a lubricant temperature. The hydraulic pressure control directly actuates and controls an eccentricity of the control ring.
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