| 摘要 |
PROBLEM TO BE SOLVED: To average the load generated in a contact part between a roller and a track surface and to improve the bearing force of a roller bearing by providing the roller bearing treated by crowning in such a state as gradually reducing the axial curvature from the axial center of the cylinder roller toward the end in an engagement part between a drive shaft driving a compressor and a stationary member. SOLUTION: In driving a refrigerant compressor using HFC based refrigerant and at the same time using ester-based synthetic oil having compatibility with the HFC based refrigerant or ether-based synthetic oil for lubricant oil, the lubricant oil 14 in a sealed container 1 is sent to main bearings 9a, 9b and a rotational bearing 10 via a feed oil passage in the central part of the drive shaft 5. It is also fed for the lubrication of an autorotation prevention member 11 and a sliding part of a scroll member. In this case, the axial curvature of the roller of the main bearing 9a composed of a cylinder roller bearing is treated by crowning as gradually reducing exponential-functionally from the center toward the longitudinal outside according to the length from the axial center. This constitution can eliminate the stress concentration in the axial end of the roller and improve the bearing force of the roller bearing.
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