VARIABLE CAPACITY VANE PUMP

摘要

In a variable capacity vane pump in which a discharge capacity of a pump chamber is varied by varying an amount of eccentricity of a cam ring relative to a rotor, a port inner wall surface that extends around an inner peripheral cam surface of the cam ring when the cam ring moves in a direction for increasing the amount of eccentricity of the cam ring relative to the rotor is formed on an intake port.

主权项

1. A variable capacity vane pump used as a fluid pressure supply source, comprising:
a rotor that is driven to rotate; a plurality of vanes housed in the rotor to be free to slide; a cam ring that includes an inner peripheral cam surface against which respective tip end portions of the vanes slide, and is capable of rotating eccentrically relative to a center of the rotor; a pump chamber defined by the rotor and the cam ring in between adjacent vanes; an intake port through which working fluid suctioned into the pump chamber is led; and a discharge port through which working fluid discharged from the pump chamber is led, wherein a port inner wall surface that extends around the inner peripheral cam surface of the cam ring when the cam ring moves in a direction for increasing an amount of eccentricity of the cam ring relative to the rotor is formed on the intake port.