| 摘要 |
PURPOSE:To prevent the occurrence of abnormal insert relation at the time of assembling a gear by providing on both sides of a sun gear a small circular portion and a large circular portion which are rolled in contact with discs on both sides of a planetry gear in an asymmetrical planetry gear device. CONSTITUTION:A sun gear 1 comprises a sun gear portion 35 engaged with a planetry gear ring 8, a small circular portion 37 opposite to a large disc portion 23 of the second planetry disc 7a in contact therewith on one side of the sun gear portion, and a large circular portion 36 opposite to a small disc portion 22 of the first planetry disc 6 in contact therewith. Accordingly, at the time of inserting the sun gear, even the sun gear is abnormally inserted, the sun gear is not aligned with the planetry gear to detect an abnormal insert relation therebetween. |
