Patent ID: 11959482
Assignee: KYB CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A vane pump comprising:
a rotor configured to be rotationally driven;
a plurality of vanes provided so as to be capable of freely reciprocating in a radial direction with respect to the rotor;
a cam ring having an inner circumference cam face on which tip end portions of the plurality of vanes slide with rotation of the rotor;
a body having an accommodating portion for accommodating the rotor and the cam ring;
a cover attached to the body to close the accommodating portion;
pump chambers formed by the rotor, the cam ring, and the adjacent vanes;
a first suction port configured to guide working fluid to the pump chambers, the working fluid being guided by a suction passage provided in the body;
a second suction port configured to guide the working fluid to the pump chambers, the working fluid being guided from the suction passage through a communication passage provided in the cover or the body; and
a return passage to which excessive fluid is guided, the excessive fluid being derived from the working fluid discharged from the pump chambers, wherein
the return passage has:
an axial direction passage through which only the excessive fluid flows along a rotation-axis direction of the rotor at an outer side of the cam ring in a radial direction; and
a turning passage configured to reverse the excessive fluid towards the second suction port, only the excessive fluid being guided to the turning passage through the axial direction passage, and

the axial direction passage and the turning passage are provided separately from the suction passage and the communication passage.