HYDRAULIC PRESSURE CONTROL DEVICE FOR CONSTRUCTION MACHINE

Title:

HYDRAULIC PRESSURE CONTROL DEVICE FOR CONSTRUCTION MACHINE

Document Type and Number:

WIPO Patent Application WO/2016/098185

Kind Code:

A1

Abstract:

A hydraulic pressure control device (100) for a construction machine, said control device equipped with: a first circuit system (10) connected to a first pump (P1); a second circuit system (20) connected to a second pump (P2); a changeover valve (25) having a normal position (A), a forward linear travel position (B), and a converging flow position (C) in which an operating fluid in a branch part (13a) is made to converge in a second intermediate passage (21); and an opening/closing mechanism (14) that opens/closes a first intermediate passage (11). When at least one of the control valves that is among control valves (222, 223, and 224) downstream from a second travel control valve (221) and is a control valve for which converging is desired is switched to a position other than the intermediate position, the first intermediate passage (11) is closed by the opening/closing mechanism (14) and the changeover valve (25) is switched to the converging flow position (C), thereby causing the operating fluid of the first pump (P1) to converge with the operating fluid of the second pump (P2).

Inventors:

FUKUDA SHUNSUKE (JP)
YOSHIDA NOBUYOSHI (JP)

Application Number:

PCT/JP2014/083299

Publication Date:

June 23, 2016

Filing Date:

December 16, 2014

Export Citation:

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Assignee:

KYB CORP (JP)

International Classes:

E02F9/22; F15B11/17; F15B11/02

Domestic Patent References:

WO2014006950A1

2014-01-09

Foreign References:

JPH0470429A	1992-03-05
JP2003056505A	2003-02-26
US20070240562A1	2007-10-18

Other References: