Title:
HYDRAULIC CIRCUIT FOR WORKING VEHICLE
Document Type and Number:
Japanese Patent JPH05141403
Kind Code:
A
Abstract:
PURPOSE: To structure an unload valve and a relief valve which is provided on a pilot oil supplying passage with compactness.
CONSTITUTION: A pilot operating control valve for supplying and discharging operation oil is provided on a hydraulic actuator which drives a back hoe device, while a pilot valve is provided for outputting result selected by operation of a lever which selects the hydraulic actuator to be operated as a pilot pressure. An unload valve 57 and a pilot pressure adjusting relief valve 58 are provided on an oil supplying passage to the pilot valve, while a relief valve 58 is arranged inside a spool 60 of the unload valve 57.
Inventors:
MORI KAZUSHIGE
Application Number:
JP29530691A
Publication Date:
June 08, 1993
Filing Date:
November 12, 1991
Export Citation:
Assignee:
KUBOTA KK
International Classes:
E02F9/22; F15B11/16; F15B11/17; (IPC1-7): E02F9/22; F15B11/16
Domestic Patent References:
| JPS587505B2 | 1983-02-10 | |||
| JP1085502B |
Attorney, Agent or Firm:
Kitamura Osamu