Abstract: A vane pump includes a high-pressure chamber formed as a groove in a bottom portion of a pump-accommodating concave portion. The working fluid is discharged from a plurality of discharge ports leading to the high-pressure chamber. A high-pressure passage has an opening portion opening to the high-pressure chamber and guides the working fluid to the outside of the high-pressure chamber. In the vane pump, one of the plurality of discharge ports is arranged so as to face the opening portion of the high-pressure passage, and the flow-passage cross-sectional area of the high-pressure chamber is smaller than the total flow-passage cross-sectional area of the plurality of the discharge ports.

Abstract: The vane pump includes a rotor, a plurality of slits, vanes that are respectively received in the slits, a cam ring that has an inner circumferential cam face with which tip portions of the vanes are brought into sliding contact, pump chambers that are defined by the rotor, the cam ring, and the adjacent vanes, a side member that has a sliding contact surface with which the side surface of the rotor is brought into sliding contact, a discharge port that is formed so as to open to the side member, the discharge port being configured to guide working fluid discharged from the pump chamber, and a notch that are provided on the side member so as to extend from the opening of the discharge port in direction opposite to rotating direction of the rotor. The notch is formed radially outside of the protruded portion of the rotor.

Abstract: The vane pump includes a rotor, a plurality of slits, vanes that are respectively received in the slits, a cam ring that has an inner circumferential cam face with which tip portions of the vanes are brought into sliding contact, pump chambers that are defined by the rotor, the cam ring, and the adjacent vanes, a side member that has a sliding contact surface with which the side surface of the rotor is brought into sliding contact, a discharge port that is formed so as to open to the side member, the discharge port being configured to guide working fluid discharged from the pump chamber, and a notch that are provided on the side member so as to extend from the opening of the discharge port in direction opposite to rotating direction of the rotor. The notch is formed radially outside of the protruded portion of the rotor.