Hydraulic device

Claim 1

A PUMP INCLUDING IN COMBINATION A HOUSING HAVING A BORE THEREIN, WALL MEANS DEFINING INLET AND OUTLET PASSAGEWAYS IN SAID HOUSING COMMUNICATING WITH SAID BORE, AN INTERNALLY TOOTHED STATOR FIXEDLY CONNECTED TO SAID HOUSING, AN EXTERNALLY TOOTHED ROTOR MOUNTED FOR ROTARY AND ORBITAL MOVEMENT WITH RESPECT TO SAID STATOR, SAID ROTOR HAVING ONE LESS TOOTH THAN SAID STATOR, A COMMUTATOR IN SAID BORE, A DRIVE SHAFT COAXIAL WITH AND CONNECTED TO SAID COMMUTATOR FOR ROTATING THE SAME, A PLURALITY OF PORTS COMMUNICATING AT ONE END WITH SPACES BETWEEN THE TEETH ON SAID STATOR AND AT THE OTHER END WITH SAID BORE, SAID COMMUTATOR HAVING A FIRST PLURALITY OF CIRCUMFERENTIALLY SPACED PASSAGES CONSTANTLY CONNECTED AT ONE END TO SAID INLET PASSAGEWAY AND AT THEIR OTHER END ADAPTED TO BE ALTERNATELY CONNECTED TO SAID PLURALITY OF PORTS, SAID COMMUTATOR ALSO HAVING A SECOND PLURALITY OF CIRCUMFERENTIALLY SPACED PASSAGES CONSTANTLY CONNECTED AT ONE END TO SAID OUTLET PASSAGEWAY AND AT THE OTHER END ADAPTED TO BE ALTERNATELY CONNECTED TO SAID PLURALITY OF PORTS, SAID FIRST PLURALITY OF CIRCUMFERENTIALLY SPACED PASSAGES BEING LOCATED ALTERNATELY WITH SAID SECOND PLURALITY OF CIRCUMFERENTIALLY SPACED PASSAGES, AN INTERNAL DRIVE GEAR CONNECTED TO SAID DRIVE SHAFT FOR COMMON ROTATION THEREWITH AND WITH SAID COMMUTATOR, AN EXTERNAL DRIVE GEAR WITHIN SAID INTERNAL DRIVE GEAR AND MESHING THEREWITH AND BEING CONNECTED TO AND COAXIAL WITH SAID ROTOR FOR COMMON ROTATIONAL AND ORBITAL MOVEMENT THEREWITH, THE NUMBER OF INTERNAL DRIVE GEAR TEETH OVER THE NUMBER OF EXTERNAL DRIVE GEAR TEETH COMPRISING A GEAR RATIO AND THE NUMBER OF SAID FIRST PLURALITY OF CIRCUMFERENTIALLY SPACED PASSAGES AS WELL AS THE NUMBER OF SAID SECOND PLURALITY OF CIRCUMFERENTIALLY SPACED PASSAGES BEING EQUAL TO SAID GEAR RATION MULTIPLIED BY THE NUMBER OF TEETH ON SAID EXTERNALLY TOOTHED ROTOR.