Rotary motor or pump

Claim 1

A HYDRAULIC MOTOR, COMPRISING A FIRST CASING PROVIDING AN INTERNALLY TOOTHED, GENERALLY CYLINDRICAL CHAMBER, A ROTOR MOUNTED IN SAID CHAMBER AND HAVING A LESSER NUMBER OF EXTERNAL TEETH FOR HYPOCYCLOIDAL MOVEMENT ABOUT THE FIRST CASING CHAMBER AXIS, SAID ROTOR HAVING AN AXIS OFFSET FROM THE FIRST CASING CHAMBER AXIS AND AN AXIAL SPINDLED BORE EXTENDING THERETHROUGH, A SECOND CASING SECURED TO SAID FIRST CASING ON SAID ONE OUTER SIDE AND PROVIDING A CHAMBER HAVING A GENEALLY CYLINDRICAL INNER WALL DEFINING AN AXIS COAXIAL WITH SAID FIRST CASING CHAMBER AXIS, A HYDRAULIC FLUID INLET PASSAGE EXTENDING GENERALLY RADIALLY OF SAID SECOND CASING CHAMBER AND COMMUNICATING SAID SECOND CASING CHAMBER WITH THE EXTEIOR OF SAID SECOND CASING FOR SUPPLYING PRESSURE FLUID TO SAID MOTOR FOR ACTUATING SAID ROTOR, A HYDRAULIC FLUID OUTLET PASSAGE EXTENDING GENERALLY AXIALLY OF SAID SECOND CASING AND COMMUNICATING SAID SECOND CASING CHAMBER WITH THE EXTERIOR OF SAID SECOND CASING FOR REMOVING PRESSURE FLUID FROM SAID FIRST CASING CHAMBER, SAID SECOND CASING BEING EQUIPPED WITH A PLURALITY OF FLOW PASSAGES, ONE FOR EACH TOOTH OF SAID FIRST CASING CHAMBER AND COMMUNICATING WITH SAID FIRST CASING CHAMBER BETWEEN ADJACENT TEETH THEREOF, SAID SECOND CASING PASSAGE COMMUNICATING WITH SAID SECOND CASING CHAMBER A SPACED DISTANCE INWARD OF THE SECOND CASING CHAMBER INNER WALL, A GENERALLY CYLINDRICAL COMMUTATOR ROTATABLY MOUNTED IN SAID SECOND CASING CHAMBER AND HAVING A BORE EXTENDING THERETHROUGH PARALLEL TO THE COMMUTATOR AXIS, SAID BORE BEING ARRANGED TO COMMUNICATE WITH A FIRST PLURALITY OF BUT LESS THAN ALL