PRESSURE MAINTAINING APPARATUS, MACHINE TOOL, AND METHOD OF RUNNING PRESSURE MAINTAINING APPARATUS IN MACHINE TOOL
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United States of America Patent
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Issued Date -
Apr 21, 2016
app pub date -
Sep 24, 2015
filing date -
Oct 17, 2014
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Abstract
A machine tool includes: a plurality of hydraulic devices including hydraulic balance cylinders; a main hydraulic unit including a main hydraulic pump and a pump motor for supplying hydraulic oil in an operation period; and a pressure-maintaining hydraulic unit connected in parallel to an oil supply line of the main hydraulic unit and including a pressure-maintaining hydraulic pump and a pump motor being smaller in output than the main hydraulic pump and the pump motor. When at least one of the hydraulic devices is operated, the hydraulic oil is supplied from the main hydraulic pump and the pump motor to the hydraulic devices. When all of the hydraulic devices are stopped, the hydraulic oil is supplied from the pressure-maintaining hydraulic pump and the pump motor to the hydraulic device in the standby period to maintain the pressure of the hydraulic oil in the hydraulic device.
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