Power plants – Pressure fluid source and motor
Patent
1974-09-05
1976-04-13
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
60493, 91467, F15B 1112
Patent
active
039495531
ABSTRACT:
In combination with a hydraulic step motor comprising a servo-valve having a rotary valve member and a housing surrounding this member. The rotary valve member is provided with two fluid manifolds conjointly movable therewith. Two main conduits communicating with a source of fluid under pressure provide passage for the fluid to the servo-valve and to the fluid manifolds.
A drivable shaft of the step motor is connected to the servo-valve rotary member to drive same. The rotary valve member comprises a plurality of primary positioning projections and of secondary sealing projections alternately spaced from one another and uniformly distributed around the periphery of the rotary valve member. Between the adjacent projection gaps are formed which are alternatively connected with one and the other of the fluid manifolds. Fluid channels provided in the wall of the housing open towards the periphery of the rotary valve member. These channels are distributed over the rotary valve member in equal distances different by at least one in number from those existing between the primary projections. A selector valve is arranged and interposed in each of the channels leading to a return conduit to a sump wherefrom the source of fluid under pressure receives the fluid.
In idle condition, the channels are closed and the fluid flow is blocked. Opening of a selected one of the channels provokes an abrupt drop of fluid pressure in a selected gap and revolution of the rotary valve member. By selection of the gap wherefrom the fluid under pressure is released, rotation may be caused in one or the other selected direction.
REFERENCES:
patent: 2125513 (1938-08-01), Martin
patent: 3460343 (1969-08-01), Touchman
patent: 3513752 (1970-05-01), Perry et al.
Feinmechanische Werke Mainz GmbH
Geoghegan Edgar W.
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