| 摘要 |
The object is to reduce manufacturing process. A second reduction wheel & pinion 100 is structured by two members of a gear 1 and a pinion 2. The gear 1 is opened, at its center, with a hole part 12 for assembling with the pinion 2. This hole part 12 is provided with two string-formed stop parts 13. This stop parts 13 are integrally formed in an opening process for the hole part 12. The stop part 13 has a string length generally equal to a spacing between adjacent two teeth 21. When fitting the pinion 2 in the gear 1, the stop part 13 is positioned between the adjacent two teeth 21, 21. By doing so, even if no cutout is provided in the pinion 2, the teeth 21, 21 of the pinion 2 engages the stop part 13, thereby suppressing the gear 1 and pinion 2 from rotating in a circumferential direction. <IMAGE> |
