HYDRAULIC SHOVEL - HITACHI CONSTRUCTION MACH CO

Title:

HYDRAULIC SHOVEL

Document Type and Number:

WIPO Patent Application WO/2020/188920

Kind Code:

A1

Abstract:

Provided is a hydraulic shovel that can improve work efficiency while limiting fuel consumption by way of reducing hydraulic loss when simultaneously operating a plurality of hydraulic actuators with different loads.　The hydraulic shovel comprises: a center bypass flow rate control valve that is disposed the furthest downstream in a center bypass line and that restricts, according to an operation amount for a second operation device when the second operation device is operated, the flow rate of pressurized oil passing through the center bypass line; and a spool stroke limiting device that limits, according to an operation amount for a first operation device, the spool stroke amount for a second directional switching valve while in a state in which the spool stroke amount for a third directional switching valve is controlled according to the operation amount for the second operation device in a case in which the first operation device and the second operation device are simultaneously operated.

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Inventors:

OGURA KOHEI (JP)
KODAKA KATSUAKI (JP)
KAYANE MASAHIRO (JP)
SHIRAKAWA YOSHIHIRO (JP)

Application Number:

PCT/JP2019/048766

Publication Date:

September 24, 2020

Filing Date:

December 12, 2019

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACH CO (JP)

International Classes:

E02F9/22; F15B11/00; F15B11/042; F15B11/08

Foreign References:

JP2014001769A	2014-01-09
JP2007192344A	2007-08-02
JP2015036495A	2015-02-23
JPS5219691B2	1977-05-30
JPH07119709A	1995-05-09
JP2013543086A	2013-11-28
JPS58146632A	1983-09-01
JPS5219691B2	1977-05-30

Other References: