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Patent Searching and Data


Title:
HYDRAULIC CIRCUIT FOR WORKING MACHINE
Document Type and Number:
Japanese Patent JP2002168204
Kind Code:
A
Abstract:

To enhance responsiveness of a control valve for a rapid operation.

Solenoid controlled proportional pressure reducing valves 11, 11 are set parallel to solenoid controlled directional control valves 7, 7 that supply a pilot pressure to the pilot chambers 4a, 4b of the control valve 4. When a lever 5a is rapidly operated at work such as the scraper work of a hydraulic shovel, the hydraulic circuit supplies a mass of a pilot fluid, which is supplied from both the pressure reducing valve 7 and the directional control valve 11 by a command signal from a controller, into the pilot chambers 4a, 4b.


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Inventors:
SAOTOME YOSHIMI
Application Number:
JP2000000362617
Publication Date:
June 14, 2002
Filing Date:
November 29, 2000
Export Citation:
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Assignee:
KOBELCO CONSTR MACHINERY LTD
International Classes:
E02F9/22; F15B11/08; (IPC1-7): F15B11/08; E02F9/22
Attorney, Agent or Firm:
小谷 悦司 (外2名)