Vane pump

Abstract

A vane pump is configured to discharge a working fluid introduced into one side of a rotary chamber formed between an outer cam ring and a rotor to the other side of the rotary chamber, wherein a through slit extending in a circumferential direction of the outer cam ring is formed in a corresponding portion of the outer cam ring corresponding to the side to which the working fluid is introduced into the rotary chamber.

1 . A vane pump configured to discharge a working fluid introduced into one side of a rotary chamber formed between an outer cam ring and a rotor to the other side of the rotary chamber,
 wherein a through slit extending in a circumferential direction of the outer cam ring is formed in a corresponding portion of the outer cam ring corresponding to the side to which the working fluid is introduced into the rotary chamber.   
     
     
         2 . The vane pump of  claim 1 ,
 wherein an upper end portion of the outer cam ring having the through slit formed therein is formed in a same height as a remaining upper end portion of the outer cam ring, and a lower end portion of the outer cam ring having the through slit formed therein is formed in the same height as the remaining lower end portion of the outer ring.   
     
     
         3 . The vane pump of  claim 1 ,
 insides of the upper end portion and the lower end portion of the outer cam ring having the through slit formed therein are chamfered.   
     
     
         4 . The vane pump of  claim 1 ,
 the upper end portion of the outer cam ring having the through slit formed therein and the lower end portion of the outer cam ring having the through slit formed therein are formed in a same height, the through slit is formed in a width at least two times of the thickness of the upper end portion or the lower end portion of the outer cam ring having the through slit formed therein, and the through slit is thereby formed in rectangular shapes.   
     
     
         5 . The vane pump of  claim 4 ,
 the through slit is formed in a width 2.5 to 3 times of the thickness of the upper end portion or lower end portion of the outer cam ring having the through slit formed therein.   
     
     
         6 . The vane pump of  claim 1 ,
 the upper and lower end portions of the outer cam ring having the through slit formed therein are formed in thicknesses which gradually increase in an opposite direction to a moving direction of the working fluid, and the through slit is correspondingly formed in a width which gradually increases.   
     
     
         7 . The vane pump of  claim 6 ,
 the upper and lower end portions of the outer cam ring having the through slit formed therein are formed vertically symmetrical to each other.   
     
     
         8 . The vane pump of  claim 1 ,
 the through slit extends up to an end portion corresponding to the opposite side of a moving direction of the working fluid in a suction port configured to communicate with the rotary chamber on the side to which the working fluid is introduced.