Hydraulic energy converting device

Claim 1

A HYDRAULIC MOTOR OR PUMP DEVICE OF THE CHARACTER DESCRIBED, COMPRISING: A CASING, ROTATABLE MESHING PINIONS IN THE CASING, SHAFT CARRYING SAID PINIONS IN THE CASING, ONE OF SAID SHAFTS PROTRUDING OUTSIDE OF THE CASING FOR TRANSMISSION OF POWER TO AND FROM THE PINIONS, BUSHINGS AND BEARINGS ROTATABLY CARRYING SAID SHAFTS TO DELIMIT IN THE CASING, SAID BUSHINGS HAVING END FLANGES TO DELIMIT A CAVITY WHEREIN SAID PINION ROTATE, SAID FLANGES BEARING AGAINST ENDS OF THE PINIONS TO FORM PRESSURE SEALS THEREAT, AN INLET PORT AND AN OUTLET PORT IN THE CASING COMMUNICATING WITH SAID CAVITY, SAID PORTS BEING SEPARATED FROM EACH OTHER BY SAID PINIONS, SAID PORTS SERVING TO PASS LIQUID UNDER PRESSURE TO AND FROM THE PINIONS, THE LIQUID PRESSURE IN ONE PORT BEING HIGHER THAN THAT IN THE OTHER PORT DURING OPERATION OF THE DEVICE AS THE MESHED PINIONS AND THE SHAFTS ROTATE, THE BUSHINGS AT ONE END OF SAID PINIONS BEING SLIDABLY MOUNTED AND HAVING PORTIONS DEFINING WITH SAID CASING A FIRST PRESSURE CHAMBER, A FIRST PRESSURE SENSITIVE DIFFERENTIAL VALVE ASSEMBLY DISPOSED IN A FIRST HYDRAULIC CIRCUIT WHICH EXTENDS BETWEEN BOTH OF SAID PORTS AND SAID FIRST PRESSURE CHAMBER, SAID VALVE ASSEMBLY BEING MOVABLE AUTOMATICALLY TO PLACE SAID FIRST PRESSURE CHAMBER IN COMMUNICATION WITH THAT ONE OF THE PORTS IN WHICH THE LIQUID PRESSSURE IS GREATER AND TO CAUSE THE SLIDABLE BUSHINGS TO BE PRESSED AGAINST THE PINIONS IN RESPONSE TO SAID GREATER PRESSURE, TWO INDEPENDENT SLIDABLE PISTON STRUCTURES IN THE CASING DEFINING WITH SAID CASING SECOND AND THIRD PRESSURE CHAMBERS, RESPECTIVELY, SAID PISTON STRUCTURES BEING IN CONTACT WITH THE SLIDABLE BUSHINGS, A SECOND PRESSURE SENSITIVE DIFFERENTIAL VALVE ASSEMBLY INCLUDING A CYLINDRICAL VALVE CHAMBER, A VALVE PISTON MEMBER AXIALLY SLIDABLE IN SAID VALVE CHAMBER AND HAVING END PORTIONS DIVIDING SAID CHAMBER INTO FIRST AND SECOND END COMPARTMENTS INTERMEDIATE THE ENDS OF SAID VALVE PISTON MEMBER AND THE ENDS OF SAID VALVE CHAMBER AND A CENTRAL COMPARTMENT INTERMEDIATE SAID END COMPARTMENTS, SAID CENTRAL COMPARTMENT BEING SHUT SIMULTANEOUSLY FROM BOTH OF SAID END COMPRATMENTS WITH SAID VALVE PISTON MEMBER IN A NEUTRAL POSITION, DISPLACEMENT OF SAID VALVE PISTON MEMBER FROM SAID NEUTRAL POSITION IN ONE DIRECTION TOWARD SAID FIRST END COMPARTMENT PLACING SAID CENTRAL COMPARTMENT IN DIRECT COMMUNICATION WTH SAID FIRST END COMPARTMENT AND DISPLACEMENT FROM SAID NEUTRAL POSITION IN THE OPPOSITE DIRECTION PLACING SAID CENTRAL COMPARTMENT IN DIRECT COMMUNICATION WITH SAID SECOND END COMPARTMENT, A FIRST PASSAGE CONNECTING ONE OF SAID PORTS WITH SAID FIRST END COMPARTMENT TO APPLY PRESSURE TO ONE END OF SAID VALVE PISTON MEMBER, A SECOND PASSAGE CONNECTING THE OTHER OF SAID PORTS WITH SAID SECOND END COMPARTMENT TO APPLY PRESSURE TO THE OTHER END OF SAID VALVE PISTON MEMBER CAUSING SAID VALVE PISTON MEMBER TO BE AUTOMATICALLY DISPLACED AWAY FROM FROM SAID NEUTRAL POSITION TOWARD THE END COMPARTMENT COMMUNICATING WITH THE PORT IN WHICH THE PRESSURE IS LOWER THERBY PLACING SAID CENTRAL COMPARTMENT IN COMMUNICATION WITH THE PORT OF LOWER PRESSURE, AND A THIRD PASSAGE INTERCONNECTING SAID SECOND AND THRID PRESSURE CHAMBERS AND SAID CENTRAL COMPARTMENT WHEREBY BOTH OF SAID TWO PISTON STRUCTURES ARE SIMULTANEOUSLY SUBJECTED TO THE LOWER OF THE PRESSURES IN THE TWO PORTS.