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Patent Searching and Data


Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/061741
Kind Code:
A1
Abstract:
A work machine comprises a variable-capacity pump (2), an actuator (5) driven by oil discharged by the pump (2), an open-center actuator flow rate control valve (4) for controlling the rate at which hydraulic oil flows to the actuator (5), a bleed-off pipe (8a) for connecting the actuator flow rate control valve (4) to a tank (6), a bleed-off flow rate control valve (8) disposed in the bleed-off pipe (8a), an operating device (3) for directing the operation of the actuator (5), a bleed-off controller (14) for controlling the opening degree of the bleed-off flow rate control valve (8) in accordance with the manipulated variable of the operating device (3), and a pump controller (15) for controlling the pump flow rate by correcting a reference pump flow rate, which corresponds to the manipulated variable of the operating device (3), in accordance with the opening degree of the bleed-off flow rate control valve (8). Provided thereby is a work machine capable of conserving energy while suppressing the incidence of any adverse sensation related to operation.

Inventors:
IMURA SHINYA (JP)
ISHIKAWA KOUJI (JP)
KANETA TOMOAKI (JP)
SATAKE HIDETOSHI (JP)
Application Number:
PCT/JP2013/078202
Publication Date:
April 24, 2014
Filing Date:
October 17, 2013
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
F15B11/00; E02F9/22; F04B49/00
Foreign References:
JP2011085198A2011-04-28
JPH11256623A1999-09-21
JP2011094687A2011-05-12
JP2012137149A2012-07-19
JP2000035005A2000-02-02
JP2006207800A2006-08-10
JP2011085198A2011-04-28
Other References:
See also references of EP 2910795A4
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
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