Engine or pump having rotors defining chambers of variable volumes

Claim 1

A PRESSURIZED FLUID ENGINE, COMPRISING IN COMBINATION: (A) A STATIONARY CLOSED GENERALLY CYLINDRICAL CASING; (B) A ROTATABLE SHAFT PASSING AXIALLY THROUGH THE CASING; (C) TWO CYLINDRICAL MEMBERS INTEGRAL WITH AND AXIALLY SPACED ON THE SHAFT, SAID MEMBERS HAVING OPENINGS THEREIN; (D) MEANS DEFINING FLUID SUPPLY AND DISCHARGE PORTS AT OPPOSITE ENDS OF THE CASING AND COMMUNICATING WITH THE OPENINGS IN THE RESPECTIVE MEMBERS; (E) A DISTRIBUTOR ROTOR WITH DIAMETRALLY ALIGNED APERTURED AXIAL EXTENSIONS FREELY ROTATABLE ON SAID SHAFT INSIDE THE CASING; (F) TWO ROTORY UNITS EACH INCLUDING A RING AND TWO DIAMETRALLY ALIGNED RADIAL PISTONS; SAID UNITS BEING ROTATABLY MOUNTED ON SAID DISTRIBUTOR ROTOR WITH THE RINGS IN AXIAL ALIGNMENT; SAID AXIAL EXTENSIONS DEFINING WITH THE RINGS AND DISTRIBUTOR ROTOR TWO ANGULARLY WIDER FLUID FEEDING CHAMBERS AND TWO ANGULARLY NARROWER FLUID DISCHARGE CHAMBERS; (G) MEANS LOCATED BETWEEN SAID RINGS AND SAID CASING FOR LIMITING BOTH OF SAID RINGS TO ROTATION IN ONLY ONE DIRECTION AND FOR PRECLUDING ROTATION OF SAID RINGS IN THE OPPOSITE DIRECTION; (H) MEANS FOR COUPLING THE RINGS TO THE SHAFT FOR ROTATING THE SHAFT UPON SEQUENTIAL ANGULAR MOVEMENTS OF THE RINGS AND FOR ALLOWING ROTATION OF THE SHAFT; SAID DISTRIBUTOR ROTOR HAVING INCLINED PASSAGES OP-