HYDRAULIC DRIVING SYSTEM - HITACHI CONSTRUCTION MACHINERY

Title:

HYDRAULIC DRIVING SYSTEM

Document Type and Number:

WIPO Patent Application WO/2015/098033

Kind Code:

A1

Abstract:

A hydraulic driving system (1) is provided with a meter-in compensator (37) and a bleed-off compensator (42), the hydraulic driving system further including a plurality of sensors (64 to 68), a controller (62), and an exit pressure changeover valve (61). The controller (62) determines whether the state of a wheel loader (2) as detected on the basis of outputs from the sensors (64 to 68) satisfies a predetermined steering regulating condition. If it is determined that the steering regulating condition is satisfied, the controller (62) outputs a command signal to the exit pressure changeover valve (61). On the basis of the command signal, the exit pressure changeover valve (61) makes the flow rate of hydraulic oil that flows in a steering cylinder (18L, 18R) smaller than a flow rate corresponding to the amount of steering operation of a steering device (35).

Inventors:

TANAKA SHINICHIRO
KODERA HIROYASU

Application Number:

PCT/JP2014/006236

Publication Date:

July 02, 2015

Filing Date:

December 15, 2014

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)

International Classes:

E02F9/22; B62D5/07; F15B11/02

Domestic Patent References:

WO2011150010A2

2011-12-01

Foreign References:

JP2013119358A	2013-06-17
JPS6341278A	1988-02-22
JP2007261509A	2007-10-11
JP2012159173A	2012-08-23
US6047545A	2000-04-11
US20120261010A1	2012-10-18
US20060089773A1	2006-04-27
JP2013119358A	2013-06-17

Other References: