| 摘要 |
PURPOSE: A speed change gear drive unit using a planetary gear is provided which has a simple structure, is easily assembled, is low in costs, and produce an extremely large change gear ratio. CONSTITUTION: A speed change gear drive unit(1) using a planetary gear comprises an eccentric shaft part(4b) eccentric with an input shaft part(4a) and rotated integrally with the input shaft part(4a), a rolling member(5) having the same axis as the eccentric shaft part(4b) and mounted rotatably on the eccentric shaft part(4b), two gear parts(5A) and(5B) formed on the rolling member(5), a gear part(6A) meshed with one gear part(5A) of the rolling member(5) and secured to a casing(2), and a gear part(7A) meshed with the other gear part(5B) of the rolling member(5) and rotated integrally with an output shaft part(7a).
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