| 摘要 |
PROBLEM TO BE SOLVED: To maintain lubrication of a pivot bearing for a long period of time with grease so as to extend the life of a pivot bearing even when cylindrical rollers and the like are used as the pivot bearing. SOLUTION: A pivot bearing 11 for pivotably supporting a pivot scroll 5 with respect to a crank pin of a drive shaft 3 is provided inside a boss portion 10A of a pivot scroll 5. Further, a grease reservoir 12 is provided on the crank pin of the drive shaft 3, and the grease reservoir 12 is filled with grease for lubricating the pivot bearing 11. This grease is supplied to the pivot bearing 11 side when its viscosity is decreased as the temperature of the pivot bearing 11 rises during compression.
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