| 摘要 |
PURPOSE:To prevent load imposed upon a large gear from being applied to an output shaft and to assemble the large gear and the output shaft separately by supporting the large gear for transmitting power to a planetry gear mechanism on a boss portion of a speed reduction gear case. CONSTITUTION:The forward end small-diameter portion 31 of an output shaft 10 is supported by a concave portion 12 formed on the front wall 1a of the speed reduction gear case 1, and the inside of the front wall 1a of the speed reduction gear case 1 is integral with a cylindrical boss 32 projected in such a manner as to encircle the output shaft 10. On the outer peripheral side of the cylindrical boss 32, a large gear 15 is supported in such a manner as to rotate idly through a pair of front and rear radial ball bearing 33. Thus, the large gear 15 is mounted independently of the output shaft 10, so that load imposed upon the large gear 15 is prevented from being applied to the output shaft 10 side. |
