| 摘要 |
PURPOSE:To prevent abnormal wear on the like of a swaying bearing for supporting an eccentric shaft into which a shaft part of a spraying scroll is inserted by tilting an inner diameter part of the swaying bearing toward the eccentricity side of an eccentric hole by a minute angle relative to the center line of an eccentric shaft, thereby reducing surface pressures of the bearing. CONSTITUTION:In an upper bearing frame 8, an upper thrust bearing 18 supports a swaying scroll 2 while an upper bearing 19 supports a larger diameter part 6a of an eccentric shaft 6 in the radial direction. In a lower bearing frame 9 on the other hand, a lower thrust bearing 20 supports the eccentric shaft 6 in the axial direction while a lower bearing 21 supports a smaller diameter part 6b of the eccentric shaft 6 in the radial direction. Further, a swaying bearing 22 is fixed in an eccentric hole 6e of the eccentric shaft 6 to support a shaft part 2c of the swaying scroll 2 in the radial direction. And a center line S-S of the eccentric hole 6e is made to tilt by a minute amount of angle alpha1 toward the eccentricity side relative to a shaft center line C-C. This keeps the swaying bearing 22 vertical even if the eccentric shaft tilts opposite the eccentric hole 6e, serving intended purpose.
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