Importance

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Abstract

A variable capacity hydraulic constant stroke piston apparatus has an annular rotor rotatably mounted for rotation around an axis of rotation and having a plurality of radial cylinder bores therein spaced at intervals therearound with working liquid inlets and outlets at the radially outer ends thereof, a rotor drive for rotating said rotor around the axis of rotation, an eccentric cam positioned within the rotor and movable along a circular locus of eccentric positions concentric with said axis of rotation; a device for fixing the eccentric cam at one of the plurality of eccentric positions and for moving the eccentric cam around the axis of rotation between said positions; a plurality of pistons radially reciprocally movably mounted in corresponding cylinder bores in the rotor, the pistons having heads normally contacting an outer periphery of the eccentric cam and moving through a constant length stroke at each position of the cam; and working liquid current rectifying means connected between the inlets and outlets of the cylinder bores and an inlet and outlet from the apparatus for supplying working liquid to the cylinders and receiving working liquid from the cylinders in a reciprocating flow and rectifying and smoothing the flow at the inlet and outlet of the apparatus. Alternatively the cam can be fixed and the stator movable through and fixable at one of the eccentric positions.

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First Claim