Vane pump

Abstract

A vane pump is used as a fluid pressure supply source and includes a rotor which is driven and rotated, a plurality of slits which are radially formed in the rotor, a plurality of vanes which slidably project from the slits, a cam ring with which tip parts of the vanes slide in contact as the rotor rotates, a pump chamber which is defined between the cam ring and adjacent ones of the vanes, a plurality of discharge ports which introduce working fluid discharged from the pump chamber contracting as the rotor rotates, a discharge passage which causes the working fluid introduced from the discharge ports to join, and a check valve which is opened for a flow of the working fluid discharged from one discharge port to the discharge passage.

1 . A vane pump used as a fluid pressure supply source, comprising:
 a rotor which is driven and rotated;   a plurality of slits which are radially formed in the rotor;   a plurality of vanes which slidably project from the slits;   a cam ring with which tip parts of the vanes slide in contact as the rotor rotates;   a pump chamber which is defined between the cam ring and adjacent ones of the vanes;   a plurality of discharge ports which introduce working fluid discharged from the pump chamber contracting as the rotor rotates;   a discharge passage which causes the working fluid introduced from the discharge ports to join; and   a check valve which is opened for a flow of the working fluid discharged from one discharge port to the discharge passage.   
     
     
         2 . The vane pump according to  claim 1 , wherein:
 the check valve is provided in a region where the pump chamber is caused to communicate with a suction side by the vanes fallen into the slits.   
     
     
         3 . The vane pump according to  claim 1 , further comprising:
 a first suction region and a first discharge region where the vanes make the first reciprocal movement and;   a second suction region and a second discharge region where the vanes make the second reciprocal movement, wherein:   the first suction region is arranged to be higher than the second suction region; and   the check valve is provided in the first discharge region.