Patent ID: 7604465
Filing Date: 2009-10-20
Classification: F01C,F04C,F16C

Abstract:
1. A scroll compressor, comprising: a housing; a compression mechanism, said compression mechanism having a stationary scroll fixed and supported in said housing, and an orbiting scroll that is intermeshed with said stationary scroll to form a plurality of compression chambers between the stationary scroll and the orbiting scroll and that revolves; and further comprising: a crankshaft having a first end side provided with a large diameter shaft section, the large diameter shaft section connecting with an eccentric member for orbiting said orbiting scroll member and being freely rotatably supported on said housing via needle shaped roller bearings having an outer ring, the large diameter shaft section and the outer ring both having an outside facing end portion directed away from the eccentric member and an inside facing end portion directed toward the eccentric member; a seal member arranged on a portion of said crankshaft extending from the outside facing portion of the large diameter shaft section, the seal member sealing off an interior of said housing from outside; and a crank chamber into which fluid containing lubrication oil is sucked, provided between said orbiting scroll member and said large diameter shaft section, wherein the large diameter shaft section has an outer circumferential surface extending in a plane along a direction parallel to a direction of extension of a central axis of the large diameter shaft section extending between the inside facing portion of the large diameter shaft section and the outside facing portion of the large diameter shaft section, the outer circumferential surface having an outside end nearer to the outside facing end portions of the large diameter shaft section and the outer ring than the inside facing end portions thereof and an inside end nearer to the inside facing end portions of the large diameter shaft section and the outer ring than the outside facing end portions thereof, with at least one of the outside end and inside end of the circumferential surface of said large diameter shaft section being spaced from a corresponding outside facing end portion or inside facing end portion of the large diameter shaft section a and spaced from a corresponding outside facing end portion or inside facing end portion of the outer ring.