Hydraulic motor or pump with higher efficiency

Abstract

A hydraulic rotary device operable as either a hydraulic pump or a hydraulic motor. The end plates 20 and 24 has plurality of grooves 14 and 16 continuously communicating with one of the plurality of pressures and communicating with fluid chambers 17 at the inner edge of a plurality of vanes 23 during a predetermined time in one rotation.

I claim:  
     
         1 . In a rotary hydraulic devise of the type comprising a fluid chamber at the inner edge of each vanes, the improvement wherein said hydraulic devise has valve means to connect said fluid chamber to fluid at a plurality of pressures during one rotation.  
     
     
         2 . The devise of  claim 1  wherein said devise has a plurality of grooves on the end plate continuously communicating with one of the plurality of pressures and communicating with fluid chamber at the inner edge of a plurality of vanes during a predetermined time in one rotation.  
     
     
         3 . The devise of  claim 1  wherein said devise has valve means to connect said fluid chamber to fluids at inlet and outlet.  
     
     
         4 . In a rotary hydraulic devise of the type functioning as a vane pump comprising a fluid chamber at the inner edge of each vanes, the improvement wherein said hydraulic devise has valve means to connect said fluid chamber to fluid at a plurality of pressures during one rotation.  
     
     
         5 . The devise of  claim 4  wherein said pump has a plurality of grooves on the end plate continuously communicating with one of the plurality of pressures and communicating with fluid chamber at the inner edge of a plurality of vanes during a predetermined time in one rotation.  
     
     
         6 . The devise of  claim 4  wherein said pump has valve means to connect said fluid chamber to fluids at inlet and outlet of the pump.  
     
     
         7 . In a rotary hydraulic devise of the type functioning as a vane motor comprising a fluid chamber at the inner edge of each vanes, the improvement wherein said hydraulic devise has valve means to connect said fluid chamber to fluid at a plurality of pressures during one rotation.  
     
     
         8 . The devise of  claim 7  wherein said motor has a plurality of grooves on the end plate continuously communicating with one of the plurality of pressures and communicating with fluid chamber at the inner edge of a plurality of vanes during a predetermined time in one rotation.  
     
     
         9 . The devise of  claim 7  wherein said pump has valve means to connect said fluid chamber to fluids at inlet and outlet of the motor.