Porting for balanced hydraulic roller pump

Abstract

Abstract ROLLERS CARRIED WITHIN THE CIRCUMFRERENTIAL NOTCHES IN A PUMP ROTOR RIDE ALONG AN OUT-OF-ROUND CAM SURFACE TO PUMP FLUID FROM RADIALLY OUTER AND INNER INLET PORTS ASSOCIATED WITH INLET CAM ARCS OF INCREASING RADIUS) TO RADIALLY OUTER AND INNER OUTLET PORTS ASSOCIATED WITH OUTLET CAM ARCS OF DECREASING RADIUS. THE OUTER INLET PORTS ARE RESTRICTED AND OPEN AXIALLY INTO RADIALLY OUTER PORTIONS OF THE NOTCHES SUBSEQUENTLY TO THE AXIAL OPENING OF THE INNER INLET PORTS INTO THE NOTCHES AT LOCATIONS RADIALLY INWARDLY OF THE ROLLERS, THE LATTER OPENING BEING SUBSEQUENT TO APPRECIABLE MOVEMENT OF THE ROLLERS LONG THE INLET CAM ARCS, THEREBY TO EFFECT A GRADUAL FLUID PRESSURE RISE IN THE ROTOR NOTCHES AND A RADIAL PRESSURE GRADIENT ENHNACING ROLLER STABILITY WITHIN THE INLET CAM ARCS. THE INNER OUTLET PORTS DISCHARGE HIGH PRESSURE FLUID AXIALLY FROM THE NOTCHES AND ARE ARRNAGED TO EXERT UNBALANCED FLUID PRESSURE FORCE AXIALLY IN ONE DIRECTION ON THE ENDS OF THE ROLLERS AS THEY MOVE ALONG APPROXIMATELY THE TRAILING THIRDS OF THE OUTLET CAM ARCS, THEREBY TO END LOAD THESE ROLLERS AND ENHANCE THEIR STBILITY.

Inventors

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