Rotor, pistons, piston shoes and associated means in fluid handling devices

In a fluid-handling machine of the type having a housing formed with a cavity having an inner circumference, a rotor body rotatably mounted in said cavity and having an outer periphery and a plurality of radial cylinder bores extending inwardly thereof, and a plurality of pistons each slidably accommodated in one of said cylinder bores, a plurality of recesses formed in said outer periphery of said rotor body, each intersecting the outer end of one of said cylinder bores and extending from the associated cylinder bore in one circumferential direction of said rotor body;

• a plurality of piston shoes each located adjacent the outer end of one of said cylinder bores and pivotably connected to the piston accommodated therein, said piston shoes each having an outwardly directed face in sliding engagement with said inner circumference and an extension projecting transversely of and beyond the associated cylinder bore in said one circumferential direction of said rotor body, said cylinder bores, recesses and piston shoes being configurated so that in the fully retracted position of the respective piston shoe the same is located substantially entirely within the associated recess and outer end of the associated cylinder bore without projecting beyond the outer periphery of said rotor body, the improvement comprising that said recesses extend in said rotor body only in direction forwardly of the axis of a respective piston, whereas the backward clyinder wall portion extends uninterrupted radially toward the outer radial end of said rotor body for guiding the respective portions of the respective pistons at the outer portion of the piston stroke.