Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber
Patent
1980-03-31
1982-08-03
Hershkovitz, Abraham
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
91510, 91530, 13759613, F01B 2502, F15B 1100
Patent
active
043422543
ABSTRACT:
A circuit for hydrostatically operable devices, especially hydraulic dredges, with at least two working circuits each of which comprises a plurality of hydraulic cylinders and/or hydraulic motors as well as a hydraulic pump while, depending on the requirement, the delivery of the pertaining hydraulic pump is conveyed to each hydraulic cylinder or hydraulic motor and while by means of a plurality of tie lines the deliveries of the remaining hydraulic pumps are selectively conveyed to one of two or more selected hydraulic cylinders or hydraulic motors. The deliveries of the hydraulic pumps flow to the tank after having passed through the control valves associated with the hydraulic cylinders and controlling each of the hydraulic pumps. The control members for each of the circuits of the pumps involved comprise circulating passages which are passed through in opposite directions while the circulating passages of one pump are through conduits and the circulating passages of the other pump are likewise through conduits connected to each other and are further by means of conduits connected to the tank. The circuit is furthermore characterized in that from the connecting conduits there branch off lines which through check valves are connected to the pressure connection of the respective control valve. The circuit is furthermore characterized in that when the control members are actuated so as to move out of their zero position both circulating passages are blocked.
REFERENCES:
patent: 3478647 (1969-11-01), Gerber
patent: 3543646 (1970-12-01), Iijima
patent: 3720059 (1973-03-01), Schurawski
patent: 3800669 (1974-04-01), Distler
patent: 3922855 (1975-12-01), Bridwell
Gerber Jurgen
Reinecke Udo
Hershkovitz Abraham
O & K Orenstein & Koppel Aktiengesellschaft
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