Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/207268
Kind Code:
A1
Abstract:
A work machine provided with: a regulator (42) for controlling the pump capacity of a variable capacity hydraulic pump (41) on the basis of a pump control signal generated according to the operation amount of an operation lever device (52) for a bucket (35); a proportional electromagnetic valve (45) that is capable of adjusting the pump control signal input to the regulator; and a controller for controlling the proportional electromagnetic valve (45) on the basis of the operation amount of the operation lever device (52). The controller is able to switch to either a normal mode in which adjustment of the pump control signal is performed by the signal adjustment valve or a responsiveness-priority mode in which adjustment of the pump control signal by the signal adjustment valve is not performed. As a result, it is possible to achieve both reduction of pressure loss and flow loss, which result from control of the flow discharged from the hydraulic pump, and responsiveness of a hydraulic actuator with intermittent, sudden lever operations.
Inventors:
AMANO HIROAKI (JP)
IMURA SHINYA (JP)
NISHIKAWA SHINJI (JP)
HITA MASAFUMI (JP)
IMURA SHINYA (JP)
NISHIKAWA SHINJI (JP)
HITA MASAFUMI (JP)
Application Number:
PCT/JP2017/017600
Publication Date:
November 15, 2018
Filing Date:
May 09, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B11/00; F15B11/08
Foreign References:
| JP5886976B2 | 2016-03-16 | |||
| JP2007051781A | 2007-03-01 | |||
| JPH0633905A | 1994-02-08 | |||
| JP2011111796A | 2011-06-09 |
Attorney, Agent or Firm:
KAICHI IP (JP)
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