HYDRAULIC CONTROL DEVICE FOR MACHINERY

WIPO Patent Application WO/2014/097709

A1

Provided is a hydraulic control device for machinery that performs cutoff control during necessary operations even when the hydraulic pump discharge pressure exceeds a cutoff pressure. The hydraulic control device is provided with: a variable capacity hydraulic pump (10); an actuator driven by pressure oil; an operation device for switching directional control valves; a tilt control unit (29) for controlling the tilt of the variable capacity hydraulic pump (10); control input-detecting units (24, 25) for detecting the control input of the operation device; and a control device (100) for acquiring the control input from the control input-detecting units (24, 25), calculating the target cutoff pressure according to the control input, calculating the amount of tilt of the variable capacity hydraulic pump (10) on the basis of the calculated target cutoff pressure, and outputting the calculated amount of tilt of the variable capacity hydraulic pump (10) to the tilt control unit (29).

JPH0893707	HYDRAULIC DEVICE OF MOTOR-DRIVEN TYPE CONSTRUCTION MACHINE
JP3776047	HYDRAULIC DEVICE FOR BACKHOE

MATSUZAKI OSAMU (JP)
YASUDA GEN (JP)
TAKAHASHI MASAYUKI (JP)
HAYASHI TOMOAKI (JP)

PCT/JP2013/077210

June 26, 2014

October 07, 2013

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HITACHI CONSTRUCTION MACHINERY (JP)

F15B11/02; E02F9/22; F04B49/00; F15B11/00; F15B11/08

JP2000346005A	2000-12-12
JPH11117873A	1999-04-27
JPH1144291A	1999-02-16
JPH0355323A	1991-03-11
JP2010276126A	2010-12-09

KASUGA Yuzuru (JP)
Kasuga 讓 (JP)

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