HYDRAULIC PRESSURE CONTROL DEVICE FOR HYDRAULIC EXCAVATION VEHICLE

Japanese Patent JP3460817

B2

PROBLEM TO BE SOLVED: To provide response characteristics or setting characteristics fitted to various types of working forms by varying opening quantity characteristics of a variable bleed valve discharging pressure oil fed from a hydraulic pump to a hydraulic actuator and being interposed in a bleed-off circuit, according to the working forms.
SOLUTION: This hydraulic pressure control device is provided with a variable displacement hydraulic pump 2, the hydraulic actuator 7 driven by the pressure oil fed from the hydraulic pump 2, a flow rate control valve 5 controlling the flow rate of the pressure oil fed to the hydraulic actuator 7 to the flow rate corresponding to the operating amount, the variable bleed valve 14 discharging the pressure oil fed from the hydraulic pump 2 to the hydraulic actuator 7 and being interposed in the bleed-off circuit 13, and a controller 15 controlling the opening quantity of the variable bleed valve. The controller 15 is provided with an opening function memory part memorizing a plurality of functions as opening functions regulating the opening quantity of the variable bleed valve 14 to select a prescribed function from the plurality of functions according to the selection signal inputted from a monitor 16.

Hiroshi Sawada
Seiichi Fuchida
Kouichi Kawamura

JP2000194580A

October 27, 2003

June 28, 2000

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KOMATSU LTD.

E02F3/43; E02F9/20; E02F9/22; F15B11/02; F16D31/02; (IPC1-7): E02F3/43; E02F9/20; E02F9/22; F15B11/02

JP200035005A
JP8239865A
JP532457U

Tsutomu Inoue

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