Title:
HYDRAULIC DRIVE DEVICE OF HYDRAULIC WORK MACHINE
Document Type and Number:
Japanese Patent JP2018028336
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To enhance volume efficiency of any variable displacement hydraulic pump among a plurality of variable displacement hydraulic pumps, in specific operation with a small required flow rate of a hydraulic actuator.SOLUTION: A hydraulic drive device of a hydraulic work machine is configured to, when it is determined, based on a signal of a work mode switch 41, that an ECO mode with a small required flow rate of a hydraulic actuator is executed at an operation determination unit, cause a controller 40 to perform control of minimizing tilting of a variable displacement hydraulic pump 12c as a specific hydraulic pump and increasing tilting of the other variable displacement hydraulic pumps 12a, 12b, and also perform specific pump control of keeping directional control valves 23-26 in a neutral state, the directional control valves provided in a center bypass line 28c continuing to a discharge path 27c of the variable displacement hydraulic pump 12c.SELECTED DRAWING: Figure 2
Inventors:
TAKEUCHI HIROKI
ODAKA KATSUAKI
KARASAWA HIDEO
ODAKA KATSUAKI
KARASAWA HIDEO
Application Number:
JP2016159317A
Publication Date:
February 22, 2018
Filing Date:
August 15, 2016
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/02; E02F9/22
Attorney, Agent or Firm:
Patent Business Corporation Takewa International Patent Office