| CPC F04C 2/3446 (2013.01) [F04C 15/06 (2013.01); F04C 2250/10 (2013.01); F04C 2250/101 (2013.01); F04C 2250/102 (2013.01); F04C 2250/20 (2013.01)] | 4 Claims |
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1. A vane pump comprising:
a rotor linked to a driving shaft;
a plurality of vanes mounted to the rotor so as to freely and radially reciprocate with respect to a rotation axis of the rotor as the rotor rotates;
a cam ring having an inner circumferential surface on which tip ends of the vanes slide as the rotor is rotated, a space between the cam ring and the rotor being divided by the plurality of vanes to form a plurality of pump chambers; and
a side member having:
a suction port configured to guide a working fluid to the pump chambers;
a discharge port configured to guide the working fluid discharged from the pump chambers; and
a notch extending from an opening edge of the suction port in a reverse-rotation direction opposite to a rotation direction of the rotor, wherein
an outer peripheral surface of the rotor has a plurality of protrusions and a plurality of recesses that alternate with one another, each protrusion protruding radially outward with respect to the rotation axis of the rotor,
at a plane perpendicular to a rotation axis of the rotor, the cam ring has with respect to positions of the suction and discharge ports, a suction region and a discharge region, and a transition region from the discharge region to the suction region in the rotation direction so that each pump chamber successively passes through the discharge region, the transition region and the suction region as the rotor rotates,
a volume of each pump chamber increases while a center of said each pump chamber passes through the suction region and decreases while the center of said each pump chamber passes through the discharge region, and
each pump chamber is configured so that while the center of said each pump chamber passes through the transition region, said each pump chamber directly communicates with the discharge port and communicates with the suction port only through the notch.
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4. A vane pump, comprising:
a rotor linked to a driving shaft;
a plurality of vanes mounted in the rotor so as to freely and radially reciprocate with respect to a rotation axis of the rotor while the rotor rotates;
a cam ring having an inner circumferential surface on which tip ends of the vanes slide as the rotor is rotated, a space between the cam ring and the rotor being divided by the plurality of vanes to form a plurality of pump chambers;
a side member having:
a suction port configured to guide a working fluid to the pump chambers;
a discharge port configured to guide the working fluid discharged from the pump chambers; and
a notch extending from an opening edge of the suction port in a reverse-rotation direction opposite to a rotation direction of the rotor, wherein
at a plane perpendicular to a rotation axis of the rotor, the cam ring has with respect to positions of the suction and discharge ports, a suction region and a discharge region, and a transition region from the discharge region to the suction region in the rotation direction so that each pump chamber successively passes through the discharge region, the transition region and the suction region as the rotor rotates,
a volume of each pump chamber increases while a center of said each pump chamber passes through the suction region and decreases while the center of said each pump chamber passes through the discharge region,
each pump chamber is configured so that while the center of said each pump chamber passes through the transition region, said each pump chamber directly communicates with the discharge port and communicates with the suction port only through the notch, and
a center angle of the cam ring formed by the pair of the vanes is greater than a center angle of the cam ring formed by a line in a radial direction of the cam ring that passes through a tip of the notch and a line in the radial direction that passes through at an opening edge of the discharge port.
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