| 摘要 |
PURPOSE:To prevent backlash by providing a wave-generator to line up three internal gears in parallel and dividing an exteral gear engaged therewith into two axially for sliding their long axes with each other. CONSTITUTION:Outside the first internal gear 11 and the second internal gear 12 of the same tooth number, the third internal gear 13 of a different tooth number is coaxially arranged in parallel. An external gear is divided into the first external gear part 14 to be engaged with the first internal gear 11 and the second internal gear 12 and the second external gear part 15 to be engaged with the second internal gear 12 and the third internal gear 13. On radial insides of external gear parts 14 and 15, an oval cam-shaped main body part 17 and an oval flange part 18 of an oval wave-generator 16 to bend the external gear into an oval shape are provided to be adjustable in phase. |
