Hydraulic pump or motor

Claim 1

A HYDRAULIC PUMP OR MOTOR UNIT, COMPRISING AN ANNULAR CAGE HAVING SPACED SHOE SURFACES DISPOSED SYMMETRICALLY OF ITS CENTER AXIS, EXTERNAL DRIVE MEANS CONNECTED TO SAID CAGE TO MOVE DIRECTLY THEREWITH DURING ROTATION OF THE LATTER ABOUT SAID AXIS, A PINTLE MOUNTED ON A ROTATIONAL AXIS OFFSET FROM SAID CENTER AXIS, SAID PINTLE INCLUDING INTEGRAL THEREWITH A CYLINDRICAL CRANK HAVING ITS LONGITUDINAL CENTER AXIS OFFSET FROM THE ROTATIONAL AXIS BY A DISTANCE SIMILAR TO SAID FIRST-MENTIONED OFFSET AND GENERALLY DISPOSED AT SOME ECCENTRICITY FROM THE CAGE CENTER AXIS, MATING PISTONS AND CYLINDERS SUPPORTED RESPECTIVELY, BETWEEN THE SHOE SURFACES AND THE CRANK AND DEFINING A PLURALITY OF FLUID CHAMBERS, THE DISTANCE BETWEEN EACH SHOE SURFACE AND THE CRANK VARYING BY TWICE THE ECCENTRICITY DURING A ROTATION OF THE CAGE ABOUT ITS CENTER AXIS, SAID PISTONS AND CYLINDERS BEING RECIPROCABLE THEREBY ALONG AXES EXTENDING RADIALLY FROM THE CRANK CENTER AXIS TO VARY THE VOLUMES OF SAID FLUID CHAMBERS, MEANS OPERABLE TO PORT THE FLUID CHAMBERS INCLUDING SEPARATE INLET AND OUTLET PORTS ON THE CRANK TERMINATING IN DIAMETRICALLY SPACED RELATIONSHIP GENERALLY EQUIDSTANT OF A PLANE THROUGH THE ABOVE-MENTIONED AXES OF THE CAGE AND PINTLE, AND THROUGH THE CENTER AXIS OF THE CRANK WHEN THE LATTER IS SO POSITIONED, AND MEANS TO ROTATE THE PINTLE ABOUT ITS ROTATIONAL AXIS SO AS SIMULTANEOUSLY TO ADJUST THE ECCENTRICITY OF THE CAGE AXIS FROM THE CRANK AXIS AND TO PHASE THE PORTING OF THE FLUID CHAMBERS EFFECTIVE TO VARY THE VOLUMETRIC FLOW CAPACITY PER CYCLE OF THE UNIT.