| 摘要 |
PROBLEM TO BE SOLVED: To reduce wear of a cam surface on a cam ring inner surface and increase of noises and pulsation of pump delivery pressure in a vane pump. SOLUTION: In the vane pump, a rotor 32 having a plurality of slits 32a formed in a radial direction in the cam ring 31 is provided, side surface of a vane pump part 30 having an outer end edge of a vane 33 slidably guided and supported in each slit slidably abut on the cam surface 31a of the cam ring inner circumference is blocked by side wall members 20, 12, and a back pressure groove 25 surrounding a rotation axis of a rotor and communicated to an inner end part of the each slit 32a to introduce pump delivery pressure therein is formed on an inner surface of the side wall members. In an angle range where the vane moves in a radial inward direction according to the rotation of the rotor, an outer circumference edge of the back pressure groove is put into the rotation axis side of the rotor along a locus L of the inner end of the vane so as to prevent a radial inner end of the side end surface of the moving vane from projecting out of the outer circumference edge of the back pressure groove by a predetermined distance or more in the radial inner direction. COPYRIGHT: (C)2005,JPO&NCIPI
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