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Patent Searching and Data


Title:
CONTROL CIRCUIT OF HYDRAULIC MOTOR FOR DRIVING ROTATING STRUCTURE
Document Type and Number:
Japanese Patent JPS62200004
Kind Code:
A
Abstract:
PURPOSE:To improve the operability of a rotating structure, by providing a pressure variable relief valve to an operational passage of a hydraulic motor and connecting a change-over valve, an electromagnetic switching valve, and an electromagnetic proportional pressure reducing valve to a pilot oil chamber of the variable pressure relief valve via a shuttle valve. CONSTITUTION:Variable pressure relief valves 23 and 23' are provided to working oil passages 6 and 7 of a hydraulic motor 5, while pilot oil chambers of the variable pressure relief valves 23 and 23' are connected to an outlet port of a shuttle valve 17. In addition, an inlet port on one side of the shuttle valve 17 is connected to a change-over valve 31, which is opened when a hydraulic valve 4 is switched, while another inlet port on the other side of the shuttle valve 17 is connected to both an electromagnetic switching valve 15 and an electromagnetic proportional pressure reducing valve 18. With this contrivance, a wide range of adjustment of the automatic braking performance, freely swinging performance, and braking force can freely be selected through only simple operation, thereby improving the operationability.

Inventors:
TONO MASAAKI
Application Number:
JP4239186A
Publication Date:
September 03, 1987
Filing Date:
February 26, 1986
Export Citation:
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Assignee:
YUTANI JUKO KK
International Classes:
F15B11/00; B66C23/86; B66D1/44; E02F9/22; (IPC1-7): B66C23/86; B66D1/44; E02F9/22; F15B11/00
Domestic Patent References:
JPS5321379A1978-02-27
JPS6020553U1985-02-13
JPS5965601A1984-04-13