| 摘要 |
PURPOSE:To reduce a frictional force between the planetary shaft and the planetary circular plate, and a circular plate and the gear by a method wherein the planetary gear and the planetary circular plate are supported by a planetary shaft, respectively. CONSTITUTION:A planetary gear device 2 is composed of a planetary gear 6 at a central outer circumferential part having teeth, a gear receiving ring 7 at the inner circumferential part installed between the planetary gear 6 and the planetary shaft 5 fixed to the carrier 4, and a plnanetary circular plate 8 having an outer diameter equal to a pitch circle of the planetary gear 6 arranged at both sides of the planetary gear 6. The planetary gear 6 and gear receiving ring 7, planetary circular plates 8, 8 are completely separately and rotatably supported by the planetary shaft 5. The outer shell inner gear 3 is composed of an outer shell gear 9 and an outer shell ring 10 having the same inner diameter as a pitch circle of the outer shell gear 9 which is arranged at both sides thereof. |
