Patent ID: 9567997
Date: 2017-02-14
CPC Classifications: F01C,F04C

Claim:
1. A variable capacity type vane pump used as a fluid pressure supply source, comprising: a rotor to be driven and rotated; a plurality of vanes reciprocally provided on the rotor; a cam ring having an inner peripheral cam surface, on which tip parts of the vanes slide with the rotation of the rotor; a pump chamber defined between adjacent vanes; a suction port configured to introduce working fluid sucked into the pump chamber; a discharge port configured to introduce the working fluid discharged from the pump chamber; and a first fluid pressure chamber and a second fluid pressure chamber provided at opposite sides of a pivot point of the cam ring; wherein when a virtual line connecting the pivot point of the cam ring and a rotation center of the rotor is a pivot center line, a virtual line connecting the rotation center of the rotor and a start edge of the discharge port is a discharge port start edge line, an angle of inclination of the discharge port start edge line with respect to the pivot center line of the cam ring is a discharge port start edge line inclination angle, a virtual line connecting the rotation center of the rotor and an end edge of the discharge port is a discharge port end edge line, an angle of inclination of the discharge port end edge line with respect to the pivot center line of the cam ring is a discharge port end edge line inclination angle and an angle of intersection between center lines of the adjacent vanes is a vane angle, the discharge port is so formed that an absolute value of a difference between the discharge port start edge line inclination angle and the discharge port end edge line inclination angle is larger than the vane angle.