Title:
REVOLVING HYDRAULIC CIRCUIT
Document Type and Number:
Japanese Patent JPS55142104
Kind Code:
A
Abstract:
PURPOSE:To prevent abnormal wear of parts by providing with a direction converting valve for braking and by releasing a stop brake gear so that a stop brake does not work in case where rotational speed of a hydraulic motor is more than a settled valve. CONSTITUTION:A relief valve 18 is connected to an oil pressure source 17 for driving a brake hydraulic cylinder 11 for a brake 10, a direction change-over valve 19 for a hydraulic pilot operating brake is installed between the pressure source 17 and a cylinder 11. If the moment of inertia for a revolving body revolved by a hydraulic motor 3 is large, even though a direction converting valve 4 is returned to the neutral position, the valve 19 is stayed at the position (b), and the brake 10 does not work. When rotation of a motor 3 comes to be less than a settled value, pressure in a pipeline 23 or 24 drops and as the valve 19 comes to be at the position (a) the brake 10 works.
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Inventors:
ICHIYAMA SHIYUUICHI
MURATA YASUHIKO
AOYANAGI YUKIO
MURATA YASUHIKO
AOYANAGI YUKIO
Application Number:
JP4897779A
Publication Date:
November 06, 1980
Filing Date:
April 23, 1979
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/08; B66C13/12; B66C23/84; B66C23/86; B66C23/94; (IPC1-7): B66C13/12; B66C23/84; B66C23/94; F15B11/08