WORK MACHINE - KUBOTA KK

Title:

WORK MACHINE

Document Type and Number:

WIPO Patent Application WO/2021/132514

Kind Code:

A1

Abstract:

The present invention limits a speed change in the operation speed of a low-load hydraulic actuator (MT) having a low operation pressure. A work machine (1) is provided with: a plurality of hydraulic actuators; a plurality of direction switch valves provided corresponding to the plurality of hydraulic actuators and being configured to switch the direction of hydraulic oil with respect to the hydraulic actuators; and a dummy load formation unit (97) that, in order to limit a speed change in the operation speed of the low-load hydraulic actuator (MT) between when a high-load hydraulic actuator (C3) having a high operation pressure and the low-load hydraulic actuator (MT) having an operation pressure lower than that of the high-load hydraulic actuator (C3) among the plurality of hydraulic actuators are operated in a combined manner and when the low-load hydraulic actuator (MT) is operated independently, forms a dummy load in a low-load-side direction switch valve (DV2) that switches the direction of hydraulic oil with respect to the low-load hydraulic actuator (MT).

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Inventors:

HORII HIROSHI (JP)

Application Number:

PCT/JP2020/048557

Publication Date:

July 01, 2021

Filing Date:

December 24, 2020

Export Citation:

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Assignee:

KUBOTA KK (JP)

International Classes:

E02F9/22; F15B11/00; F15B11/028; F15B11/042; F15B11/05; F15B11/08

Foreign References:

JPH05302603A	1993-11-16
JP2018135926A	2018-08-30
JP2002031103A	2002-01-31
JPH11117906A	1999-04-27
JP2017115992A	2017-06-29
JP2012067459A	2012-04-05

Other References: