Tandem Pump No-Load Operation Device
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United States of America Patent
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Issued Date -
May 8, 2008
app pub date -
Aug 3, 2005
filing date -
Sep 22, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
When the pressure in the main oil supply channel is lower than the no-load operation start pressure, the pressurized oil within the secondary oil supply channel passes through the internal flow channel of the spool and flows into the main oil supply channel. At this time oil output from both the main and secondary oil pumps is merged and supplied to the oil supply destination. When the pressure within the main oil supply channel rises and reaches the no-load operation start pressure, the spool moves in opposite direction to the direction of the force of the spring, the pressurized oil within the secondary oil supply channel is drained, the poppet contacts the spool and blocks the internal flow channel of the spool. At this time, the secondary oil pump enters the no-load operation state, and oil output from the main oil pump only is transmitted to the oil supply destination.
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