Crowell & Moring LLP
Work machine
Provided is a work machine including: a variable-displacement pump 2; an actuator 5 driven by a hydraulic fluid delivered from the pump 2; a flow control valve 4 of an open-center type that controls a flow rate of the hydraulic fluid supplied to the actuator 5; a bleed-off line 8a connecting the actuator flow control valve 4 to a tank 6; a bleed-off flow control valve 8 disposed in the bleed-off line 8a; an operating device 3 that specifies operation of the actuator 5; a bleed-off control device 14 that controls a degree of opening of the bleed-off flow control valve 8 in accordance with an amount of manipulation of the operating device 3; and a pump control device 15 that controls, in accordance with the degree of opening of the bleed-off flow control valve 8, a pump flow rate by correcting a reference pump flow rate that is based on the amount of manipulation of the operating device 3. The work machine with this configuration can save energy while at the same time inhibiting an occurrence of a sense of strangeness or discomfort in particular operation.
Hitachi Construction Machinery Co., Ltd.
F E F F F F F E E F F F E F E F F E E F
F15B E02F F15B F15B F15B F15B F15B E02F E02F F15B F15B F15B E02F F04B E02F F15B F15B E02F E02F F15B
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Kouji Tomoaki Hidetoshi Shinya
Ishikawa Kaneta Satake Imura