Document Type and Number:
Japanese Patent JPS6233442
Kind Code:
B2
Abstract:
A hydraulic drive system including a main line, a variable displacement hydraulic pump and another main line connected to a single rod cylinder in a closed hydraulic circuit, and a flushing valve having a first switching position in which one main line is communicated with a low pressure line and a second switching position in which the other main line is communicated with the low pressure line. The flushing valve is operative to maintain at least one of the two main lines in communication with the low pressure line at all times while moving from one switching position to the other switching position, to keep a lock-up phenomenon from taking place in the closed hydraulic circuit. The system further includes a pressure generating device for generating between the two main lines a pressure differential necessary for effecting switching of the flushing valve.
Inventors:
AOYANAGI YUKIO
IZUMI EIKI
WATANABE HIROSHI
PPONMA KAZUO
NAKAJIMA YOSHIO
IZUMI EIKI
WATANABE HIROSHI
PPONMA KAZUO
NAKAJIMA YOSHIO
Application Number:
JP161481A
Publication Date:
July 21, 1987
Filing Date:
January 10, 1981
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/00; F15B7/10; F15B11/08; F16K11/07
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