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US 11,959,482 B2Granted
Vane pump
AssigneeKYB Corporation
InventorMasamichi Sugihara
Life of this patent
Estimating the term…
Abstract
A vane pump includes: pump chambers formed by a rotor, a cam ring, and vanes; a first suction port that guides working fluid guided by a suction passage to the pump chambers; a second suction port that guides the working fluid guided from the suction passage through a communication passage to the pump chambers; and a return passage to which excessive fluid of the working fluid discharged from the pump chambers is guided. The return passage has: a body-internal passage through which the excessive fluid flows along an axis direction at an outer side of the cam ring in a radial direction; and a turning passage that reverses the excessive fluid guided through the body-internal passage towards the second suction port.
Claims5
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.
12 more elements
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;
- a return passage to which excessive fluid is guided, the excessive fluid being derived from the working fluid discharged from the pump chambers;
- and
- a plate member arranged between the communication passage and 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,
- the plate member is provided with a cut-out portion, the cut-out portion opening at an outer circumferential surface of the plate member, and the cut-out portion penetrating through between both end surfaces of the plate member,
- the second suction port has a side port formed by the cut-out portion of the plate member, and
- the turning passage is configured to reverse the working fluid towards the side port, the working fluid being guided by the axial direction passage.
15 more elements
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.
12 more elements
Dependencies are inferred from the claim text.