| 摘要 |
PURPOSE:To improve the transmission efficiency, by providing a bearing on the outer circumference of a receiving gear for an output member so as to receive the radian load being applied onto the receiving gear. CONSTITUTION:At least one gear 17 in a planetary gear 15 is constructed into an external gear while a receiving gear 27 of an output member 25 gearing with said gear 17 is constructed into an internal gear and a bearing 29 for supporting the outer circumference of the receiving gear 27 rotatably is provided between a fixed support 19. Since the radian load being applied onto the receiving gear 27 as the planetary gear 15 performs a planetary motion is born by said bearing 29, the output member 25 is rocked slightly by said load so as to stabilize the gearing between the planetary gear 15 and the receiving gear 27. Consequently, the durability of the tooth flank is improved while simultaneously the rotation of the planetary gear 15 is stabilized thus improving the transmission efficiency. Furthermore, the bearing 29 can be provided at the tip of one side of the output member 25, thereby the overall length can be shortened. |
