| 摘要 |
<P>PROBLEM TO BE SOLVED: To hold a lubricant around a sphere, while reducing operational resistance for preventing rotation of a rotary scroll. Ž<P>SOLUTION: A ball coupling mechanism 15 is provided with a lubricant pushing-back mechanism 23 in a position between a cylindrical member 21 and storage holes 16C and 18C of thrust receivers 16 and 18. This lubricant pushing-back mechanism 23 is composed of spiral grooves 24 and 25 arranged on an outer peripheral surface 21A of the cylindrical member 21 and spiral grooves 26 and 27 arranged on end surfaces 21C and 21D of the cylindrical member 21. Thus, the spiral grooves 24 and 25 can push back the lubricant to the bottom surface 16E, 18E side of the storage holes 16C and 18C by rotating the cylindrical member 21 by rolling by inner peripheral surfaces 16D and 18D. The spiral grooves 26 and 27 can return the lubricant to an inside space 22 by moving to the central side in the radial direction. Thus, the lubricant can be always held in the inside space 22. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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