Cam liner profile

Abstract

A vane pump is provided and includes a liner having an inlet window and a discharge window, the liner being formed to define a cam surface and a rotor carrying a plurality of radially extending vanes which are forced outwardly such that vane tips thereof contact with the cam surface, the rotor having a direction of rotation such that one end of the inlet window is an upstream end and an opposed end is a downstream end, a radius of each of the vane tips being approximately 0.114 inches (0.3 cm) and a profile of the cam surface being defined in accordance with the radius of the vane tips.

1 . A vane pump comprising:
 a liner having an inlet window and a discharge window, the liner being formed to define a cam surface; and   a rotor carrying a plurality of radially extending vanes which are forced outwardly such that vane tips thereof contact the cam surface, the rotor having a direction of rotation such that one end of the inlet window is an upstream end and an opposed end is a downstream end,   a radius of each of the vane tips being approximately 0.114 inches (0.3 cm) and a profile of the cam surface being defined in accordance with the radius of the vane tips.   
     
     
         2 . The vane pump according to  claim 1 , wherein the plurality of the vanes comprises 4 vanes. 
     
     
         3 . The vane pump according to  claim 2 , wherein each vane is perpendicular to an adjacent vane. 
     
     
         4 . The vane pump according to  claim 1 , wherein the profile of the vane surface diverges from a profile of a tracing defined by each of the vane tips as the rotor rotates. 
     
     
         5 . The vane pump according to  claim 4 , wherein the divergence occurs between the 45-135 and the 315-225 degree positions as measured from a top-dead center of the cam surface profile. 
     
     
         6 . The vane pump according to  claim 1 , wherein the inlet window is formed as a plurality of inlet windows. 
     
     
         7 . A vane pump comprising:
 a liner having an inlet window and a discharge window, the liner being formed to define a cam surface; and   a rotor carrying a plurality of radially extending vanes which are forced outwardly such that vane tips thereof contact the cam surface, the rotor having a direction of rotation such that one end of the inlet window is an upstream end and an opposed end is a downstream end,   a radius of each of the vane tips being approximately 0.150 inches (0.4 cm) and a profile of the cam surface being defined in accordance with the radius of the vane tips.   
     
     
         8 . The vane pump according to  claim 7 , wherein the plurality of the vanes comprises 4 vanes. 
     
     
         9 . The vane pump according to  claim 8 , wherein each vane is perpendicular to an adjacent vane. 
     
     
         10 . The vane pump according to  claim 7 , wherein the profile of the vane surface diverges from a profile of a tracing defined by each of the vane tips as the rotor rotates. 
     
     
         11 . The vane pump according to  claim 10 , wherein the divergence occurs between the 45-135 and the 315-225 degree positions as measured from a top-dead center of the cam surface profile. 
     
     
         12 . The vane pump according to  claim 7 , wherein the inlet window is formed as a singular inlet window. 
     
     
         13 . A vane pump comprising:
 a liner having an interior facing cam surface and being formed to define an inlet window and a discharge window; and   a rotor disposed within the liner and carrying a plurality of radially extending vanes which are forced outwardly such that vane tips thereof contact the cam surface during rotor rotation, the rotor having a direction of rotation such that respective one ends of the inlet and outlet windows are upstream ends and that respective opposed ends are downstream ends,   a profile of the cam surface being defined in accordance with the radius of the vane tips such that the profile diverges from a profile of a tracing defined by each of the vane tips as the rotor rotates.   
     
     
         14 . The vane pump according to  claim 13 , wherein the plurality of the vanes comprises 4 vanes. 
     
     
         15 . The vane pump according to  claim 14 , wherein each vane is perpendicular to an adjacent vane. 
     
     
         16 . The vane pump according to  claim 13 , wherein a radius of each of the vane tips is approximately 0.114 inches (0.3 cm). 
     
     
         17 . The vane pump according to  claim 16 , wherein the divergence occurs between the 45-135 and the 315-225 degree positions as measured from a top-dead center of the cam surface profile. 
     
     
         18 . The vane pump according to  claim 13 , wherein the inlet window is formed as a plurality of inlet windows. 
     
     
         19 . The vane pump according to  claim 13 , wherein a radius of each of the vane tips is approximately 0.150 inches (0.4 cm). 
     
     
         20 . The vane pump according to  claim 19 , wherein the divergence occurs between the 45-135 and the 315-225 degree positions as measured from a top-dead center of the cam surface profile.