Title:
HYDRAULIC DRIVING DEVICE
Document Type and Number:
Japanese Patent JP3682165
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure a high control with high responsiveness by interposing a hydraulic pilot system pressure control valve in pilot piping connected with each pilot operating part of a plurality of control valves and interposing an electromagnetic proportional valve in pilot piping connected with the pilot operating part of the pressure control valve.
SOLUTION: In a hydraulic driving device provided with an operating lever device of a construction machine, hydraulic pilot system pressure control valves 20a, 20b are interposed in first pilot piping connecting a pilot pump 15 to each pilot operating part P1, P2 of first through fourth control valve groups 11 to 14. In second pilot piping connecting the pilot pump 15 to each pilot operating part of the pressure control valves 20a, 20b, electromagnetic proportional valves 22a, 22b are interposed. By switching the electromagnetic proportional valve 22a or 22b by a signal from an operating lever device 15, the pressure control valve 20a or 20b is switched and the control valves 11 to 14 are switched.
Inventors:
Toshihiro Ohno
Kentaro Tashiro
Kentaro Tashiro
Application Number:
JP22163698A
Publication Date:
August 10, 2005
Filing Date:
August 05, 1998
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/20; F15B11/17; (IPC1-7): F15B11/17; E02F9/20
Domestic Patent References:
| JP7055030A | ||||
| JP64102131A | ||||
| JP4203605A | ||||
| JP4052329A | ||||
| JP51065425A | ||||
| JP55027584A | ||||
| JP421016B2 | ||||
| JP10227048A |
Attorney, Agent or Firm:
Kasuga Toshiaki
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