WORK MACHINE

WIPO Patent Application WO/2015/198644

A1

Provided is a work machine capable of efficiently regenerating energy that a working oil has at the time of deceleration turning. In the present invention, a deceleration turning detection unit (57a) detects a state of deceleration of an upper turning body (102); an operation determination unit (57c) determines a state of a bidirectionally tiltable pump-motor (14) not supplying the working oil to any one of a boom cylinder (1) and an arm cylinder (3); and, when the number of the bidirectionally tiltable pump-motors (14, 18) that were supplying the working oil to a hydraulic motor (7) for turning in a state before the detection by the deceleration turning detection unit (57a) of the state of deceleration of the turning body (102) is one or more, a pump valve control unit (57d) controls switching valves (43a, 45b, 45d, 49d) to open and increases the displacement of the bidirectionally tiltable pump-motors (14, 18) respectively toward the side on which the suction pressure of the bidirectionally tiltable pump-motors (14, 18) becomes higher than the discharge pressure thereof, thereby causing the bidirectionally tiltable pump-motors (14, 18) to act as motors.

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SAITOH TEPPEI (JP)
AKIYAMA YUKI (JP)
HIRAKU KENJI (JP)
TAKAHASHI HIROMASA (JP)
SHIMIZU JURI (JP)

PCT/JP2015/057053

December 30, 2015

March 10, 2015

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HITACHI CONSTRUCTION MACHINERY (JP)

F15B21/14; E02F9/22

JPS566901A	1981-01-24
US20130098017A1	2013-04-25
JPS61151333A	1986-07-10

The Patent Body Corporate TAKEWA INTERNATIONAL PATENT OFFICE (JP)
Patent business corporation Takekazu international patent firm (JP)

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