Rotary expansible chamber devices – With changeable working chamber magnitude – Spring or fluid biased movable member
Patent
1987-03-04
1988-07-19
Vrablik, John J.
Rotary expansible chamber devices
With changeable working chamber magnitude
Spring or fluid biased movable member
418 28, F03C 222, F04C 2344, F04C 1504
Patent
active
047581379
ABSTRACT:
A vane type variable displacement motor comprising a body having an elliptical first bore, end caps with axial bores, an axial drive shaft journaled therethrough and a rotor on the shaft. A plurality of radial vanes are movably mounted upon and around the rotor and are biased toward the first bore and react to pressurized liquid delivered through intake and exhaust passages in the body. Rotative pistons upon the shaft within the end cap bores have a series of radial slots to receive the vanes whereby the pistons are adapted for axial movement relative to the vanes into the first bore for modifying the effective internal volume of the first bore and speed of shaft rotation. Pilot ports in the end caps are connected to a variable pressure source for biasing the pistons variably into the first bore.
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