Patent ID: 8186981

Claim:
A scroll compressor comprising: a fixed scroll; and an orbit scroll which revolves in the orbit with respect to the fixed scroll, spiral laps being formed on the mutually facing faces of the fixed scroll and a mirror plate of the orbit scroll, respectively, the laps being engaged with each other to form a plurality of compression chambers, an eccentric shaft of a motor which drives the orbit scroll being provided with a slide bush having a slide face forming a predetermined angle with respect to the direction of gas load of a gas in each compression chamber, so that when the load of the gas in the compression chamber is applied, the eccentric amount of the eccentric shaft increases, the scroll compressor further comprising: a spring member having a curvature radius interposed between the slide bush and the eccentric shaft and configured to constantly urge the eccentric shaft to decrease the eccentric amount of the eccentric shaft, and a spring receiving portion formed in the inner surface of the slide bush to receive the spring member, wherein the spring member is arranged so as to urge the eccentric shaft to press the eccentric shaft onto the slide face of the slide bush, and wherein a condition R 0 >R 1 >R 2 >R 3 is provided, when R 0 is the curvature radius of the spring member when opened, R 1 is the curvature radius of the spring member when received in the spring receiving portion and any gas load in the compression chamber is not applied to the spring member, R 2 is the curvature radius of the spring member at a time when the gas load in the compression chamber is applied to the spring member, and R 3 is the curvature radius of the spring receiving portion.