Vane Pump

Abstract

A vane pump that is provided with, inside a case, a cam ring, a rotor that is disposed inside this cam ring so as to be freely rotatable, a plurality of vanes that is accommodated in each of a plurality of vane grooves that is radially formed in this rotor and slides along the cam surface of the cam ring accompanying the rotation of the rotor, and a front combination side plate and a rear combination side plate that are disposed on opposite sides of the rotor and the vanes. In the vane pump, the front combination side plate is a combination side plate formed by a first front plate and a second front plate, the rear combination side plate is a combination side plate formed by a first rear plate and a second rear plate, and the front combination side plate and the rear combination side plate have an identical rigidity and are symmetrically disposed with respect to the rotor.

1 . A vane pump comprising, inside a case, a cam ring, a rotor that is disposed inside the cam ring so as to be freely rotatable, a plurality of vanes that is accommodated in each of a plurality of vane grooves that is radially formed in the rotor and slides along a cam surface of the cam ring accompanying the rotation of the rotor, and side plates that are disposed on opposite sides of the rotor and the vanes, wherein:
 the side plates have an identical rigidity and are disposed symmetrically with respect to the rotor.   
   
   
       2 . The vane pump according to  claim 1 , wherein each of the side plates are formed by identical members and by identical shapes. 
   
   
       3 . The vane pump according to  claim 1 , wherein each of the side plates is a combined side plate comprising a first plate and a second plate and has a back pressure chamber into which a pressurized fluid is caused to flow between the first plate and the second plate. 
   
   
       4 . A vane pump comprising, inside a case, a cam ring, a rotor that is disposed inside the cam ring so as to be freely rotatable, a plurality of vanes that is accommodated in each of a plurality of vane grooves that is radially formed in the rotor and slides along the cam surface of the cam ring accompanying the rotation of the rotor, and side plates that are disposed on the opposite sides of the rotor and the vanes, wherein:
 a bolt is inserted into a center hole of at least one of the side plates.   
   
   
       5 . The vane pump according to  claim 4 , wherein each of the side plates is a linked combination side plate in which a first plate and a second plate are held together by a linking bolt, and the linking bolt is inserted into a center hole of the second plate and fastened in an internal thread that is formed in a center hole of the first plate. 
   
   
       6 . The vane pump according to  claim 5 , wherein the linking bolt is a hollow bolt. 
   
   
       7 . The vane pump according to  claim 5 , wherein a back pressure chamber into which a pressurized fluid is caused to flow is provided between the first plate and the second plate. 
   
   
       8 . The vane pump according to  claim 5 , wherein the linked combination side plate and the cam ring are fastened by a fastening bolt that is disposed on the outer circumference portion thereof, and a compressing force is applied in advance to a center hole vicinity of the first plate by tightening the linking bolt. 
   
   
       9 . The vane pump according to  claim 5 , wherein both of the side plates are the linked combination side plates. 
   
   
       10 . The vane pump according to  claim 5 , wherein one of the side plates is the linked combination side plate, and the other is the combination side plate. 
   
   
       11 . The vane pump according to  claim 5 , wherein one of the side plates is the linked combination side plate, and the other is a movable side plate that freely slides in an axial direction. 
   
   
       12 . The vane pump according to  claim 5 , wherein one of the side plates is a movable combination side plate that freely slides in an axial direction, and the other is the combination side plate. 
   
   
       13 . The vane pump according to  claim 5 , wherein one of the side plates is the movable combination side plate that freely slides in an axial direction, and the other is the linked combination side plate. 
   
   
       14 . The vane pump according to  claim 5 , wherein one of the side plates is the movable combination side plate that freely slides in an axial direction, and the other is the movable side plate. 
   
   
       15 . The vane pump according to  claim 5 , wherein one of the side plates is a movable combination side plate that freely slides in an axial direction.