Patent ID: 6872062
Filing Date: 2005-03-29
Classification: F04C

Abstract:
1. A scroll compressor in which an interior of a closed shell is divided into a compression chamber and an electric motor chamber by a main frame; and a rotational drive shaft is provided to transmit a rotational driving force generated in said electric motor chamber into said compression chamber, wherein said rotating drive shaft has a main shaft arranged coaxially in said electric motor chamber and a crank shaft, which is integrally formed at one end of said main shaft, for revolving an orbiting scroll in said compression chamber; taking the diameter of said main shaft as Dm and the diameter of said crank shaft as Dc, said crank shaft is arranged so that an eccentricity e thereof with respect to said main shaft has a relation of e>(Dm−Dc)/2; between said main shaft and said crank shaft is provided a joint shaft having a length within 3 mm corresponding to a machining relief at a time when machining is performed with an accuracy necessary for functioning such that said main shaft serves as a sliding bearing with respect to a main bearing of said main frame and said crank shaft serves as a sliding bearing with respect to a crank bearing of said orbiting scroll; and said joint shaft has a shape which falls within the diameter Dm of said main shaft and within the diameter Dc of said crank shaft when viewed in the axial direction.