| 摘要 |
A vane compressor in which a plurality of pumping chambers are defined by a cam ring, side blocks closing respectively opposite axial open ends of the cam ring, a rotor rotatably arranged within the cam ring, and a plurality of vanes slidably fitted for radial movement in an outer peripheral surface of the rotor. The pumping chambers have their respective volumes varying with rotation of the rotor. The cam ring has an inner peripheral camming surface with a cam profile consisting of a first regularly circular portion at which the outer peripheral surface of the rotor is in close contact with the inner peripheral camming surface, an increasing radius portion along which an amount of vane protrusion progressively increases, a constant radius portion along which the amount of vane protrusion is maintained constant, a decreasing radius portion along which the amount of vane protrusion progressively decreases, and a second regularly circular portion at which the rotor outer peripheral surface is in close contact with the inner peripheral camming surface. These portions are arranged in continuous relation to each other in the order mentioned above. Acceleration of vane protrusion is substantially low at an initiating edge of the increasing radius portion.
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