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

Claim 4:
5. 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 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, the excessive fluid being guided through the axial direction passage, and

a partition portion is provided between the turning passage and the communication passage, the partition portion being configured to partition the turning passage and the communication passage in the rotation-axis direction.