| 摘要 |
In a scroll type compressor, the cylindrical surface of the auxiliary shaft 5c is eccentric from the cylindrical surface of the main shaft 5b and the cylindrical surface of the rotor shaft 5d, in such a manner that the amount of eccentricity thereof satisfies the following condition: 1/10000<(amount of eccentricity)/(bearing span)<20/10000, and the direction of eccentricity thereof is in a range of from 0 DEG to 40 DEG in the direction of the centrifugal force of the upper balance weight 8 with respect to the direction in which the crank section 5a receives a gas compression load, and the main shaft 5b has an initial angle of relative inclination opposite to the angle of inclination which is formed by the gas pressure load and the centrifugal load of the balance weight. During the operation of the compressor, the load deflection angle and the initial deflection angle are canceled out by each other, so that the main bearing 3a and the main shaft 5b are held in parallel with each other. As a result, the input is decreased, and the shaft is scarcely worn, and is prevented from seizure.
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