WORK MACHINE - HITACHI CONSTRUCTION MACH CO

Title:

WORK MACHINE

Document Type and Number:

WIPO Patent Application WO/2020/170540

Kind Code:

A1

Abstract:

Provided is a work machine that is not provided with a merging pipe allowing pressurized oil from a second pump to be supplied to a boom cylinder bottom-side chamber and that can achieve, during lifting motion of a slewing boom, operability and energy conservation equivalent to a work machine provided with the merging pipe.　A controller calculates a virtual flow rate that is the flow rate in a virtual merging pipe, calculates a first pump preliminary target flow rate on the basis of control input from a boom operation device, calculates a second pump preliminary target flow rate on the basis of control input from a slewing operation device, calculates a first pump final target flow rate by adding the virtual flow rate to the first pump preliminary target flow rate, and calculates the second pump final target flow rate by subtracting the virtual flow rate from the second pump preliminary target flow rate.

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Inventors:

OGAWA YUICHI (JP)
IMURA SHINYA (JP)

Application Number:

PCT/JP2019/046212

Publication Date:

August 27, 2020

Filing Date:

November 26, 2019

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

E02F9/22; F15B11/02; F15B11/04; F15B11/17

Foreign References:

JP2005083427A	2005-03-31
JP2016061387A	2016-04-25
JP2011157790A	2011-08-18

Other References: