Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1982-01-05
1985-06-04
Husar, Stephen F.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60475, F16D 3102
Patent
active
045206260
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.
REFERENCES:
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patent: 2716995 (1955-09-01), Baugh et al.
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patent: 3636708 (1972-01-01), Karman et al.
patent: 3878763 (1975-04-01), Lang
patent: 4047384 (1977-09-01), Saruwatari
Aoyagi Yukio
Honma Kazuo
Izumi Eiki
Nakajima Kichio
Watanabe Hiroshi
Hitachi Construction Machinery Co. Ltd.
Husar Stephen F.
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