VARIABLE-FLOW RATE OIL PUMP
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United States of America Patent
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Sep 25, 2015
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Oct 16, 2014
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Abstract
A variable-flow rate oil pump includes: a main oil pump; a subsidiary oil pump; a control valve provided with a spool valve body; a main discharge oil passage; a subsidiary discharge oil passage merging with the main discharge oil passage; a main relief oil passage branching from the main discharge oil passage; a subsidiary relief oil passage branching from the subsidiary discharge oil passage; and a check valve permitting a flow only in one direction from the upstream side to the downstream side of the subsidiary discharge oil passage. The control valve is positioned at respective intermediate points of the main relief oil passage and the subsidiary relief oil passage, and the control valve is positioned on the upstream side of the check valve in the subsidiary discharge oil passage, and an engine speed at which the subsidiary discharge oil passage.
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