Scroll-type compressor with eccentricity adjusting bushing

A scroll-type compressor comprising:

• a stationary scroll member having a spiral-shaped wrap;
• an orbiting scroll member having a spiral-shaped wrap of the same shape as that of said wrap of the stationary scroll member but having a rotated orientation;
• a compression chamber defined between the wraps of the scroll members;
• a driving shaft eccentrically connected to the orbiting scroll member for causing the orbiting scroll member to orbit;
• an eccentricity adjusting bushing interposed between the orbiting scroll member and said driving shaft in order to prevent a radial leakage of a compressed fluid from said compression chamber and having an inner opening eccentrically disposed therein;
• a driving pin of said driving shaft being received in the inner opening of said eccentricity adjusting bushing;
• and
• means for limiting a rotation of the eccentricity adjusting bushing with respect to said driving pin to a predetermined extent, said means comprising a plane side surface provided at a side of said inner opening of the eccentricity adjusting bushing and a cutoff plane surface provided at a side of the driving pin, whereby said driving pin being provided with a partially crescent-shaped cutoff part and said bushing being provided with a partially crescent-shaped remaining part, wherein said partially crescent-shaped cutoff part of the driving pin has a larger cross-sectional area than that of the partially crescent-shaped remaining part of the eccentricity adjusting bushing so that a space is provided between the driving pin and the bushing,
• whereby opposite directional rotation of the eccentricity adjusting bushing with respect to the driving pin being limited to an angular range by virtue of said means for limiting the rotation of the bushing, and change of a radius of orbital movement of the orbiting scroll, that is, change of a distance between centers of the eccentricity adjusting and the driving shaft being limited to a desired range.