Title:
HYDRAULIC CONTROL DEVICE FOR WORK VEHICLE
Document Type and Number:
WIPO Patent Application WO/2011/138963
Kind Code:
A1
Abstract:
A hydraulic control device for a work vehicle is provided with a hydraulic pump which supplies pressure oil; an arm driving actuator whereby an arm mounted on the work vehicle is driven into swinging by the pressure oil supplied by the hydraulic pump; a bucket driving actuator whereby a bucket mounted on the tip of the arm is driven into swinging by the pressure oil supplied by the hydraulic pump; an arm driving pressure oil control valve which controls the pressure oil supplied to the arm driving actuator from the hydraulic pump, and controls the driving of the arm driving actuator; a bucket driving pressure oil control valve which controls the pressure oil supplied to the bucket driving actuator from the hydraulic pump, and controls the driving of the bucket driving actuator; an arm operating section which controls the arm driving pressure oil control valve; a bucket operating section which controls the bucket driving pressure oil control valve; an operation state detection section which detects the operation states of the arm driving actuator and the bucket driving actuator; and a flow rate control valve which restricts the pressure oil supplied to the arm driving actuator, when it is detected by the operation state detection section that the arm driving actuator and the bucket driving actuator are operated in a combined manner.
Inventors:
SHIMAZU ATSUSHI (JP)
AZUMA HIROYUKI (JP)
CHOUNAN KAZUO (JP)
MIYAMOTO YASUNORI (JP)
AZUMA HIROYUKI (JP)
CHOUNAN KAZUO (JP)
MIYAMOTO YASUNORI (JP)
Application Number:
PCT/JP2011/060601
Publication Date:
November 10, 2011
Filing Date:
May 06, 2011
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
SHIMAZU ATSUSHI (JP)
AZUMA HIROYUKI (JP)
CHOUNAN KAZUO (JP)
MIYAMOTO YASUNORI (JP)
SHIMAZU ATSUSHI (JP)
AZUMA HIROYUKI (JP)
CHOUNAN KAZUO (JP)
MIYAMOTO YASUNORI (JP)
International Classes:
F15B11/16; E02F9/22
Foreign References:
| JPS55172452U | 1980-12-10 | |||
| JPH1171788A | 1999-03-16 | |||
| JPH07207710A | 1995-08-08 | |||
| JPH07259117A | 1995-10-09 | |||
| JP2006144851A | 2006-06-08 | |||
| JP2007120512A | 2007-05-17 | |||
| JPH1089308A | 1998-04-07 | |||
| JP2000136803A | 2000-05-16 | |||
| JP2005127416A | 2005-05-19 |
Other References:
See also references of EP 2568181A4
Attorney, Agent or Firm:
NAGAI, Fuyuki (JP)
Fuyuki Nagai (JP)
Fuyuki Nagai (JP)
Download PDF:
Claims: