| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive small reduction gear constituted of a few number of parts in comparison with the same type small reduction gear, and having the small size, the light weight, low noise, the large gear ratio, high transmission efficiently, and high breaking resistance. SOLUTION: This small reduction gear composed of a fixed internal gear 10; a movable internal gear 20; a planetary gear 12 to be meshed with the fixed internal gear 10 and the movable internal gear 20 and held by a holder body 15 and a holder presser 19; and a sun gear 4 directly connected to a motor shaft 3 to be meshed with the planetary gear 12 is constituted of a strut beam provided on the holder body 15, and guide parts provided on the contact parts of the fixed internal gear 10 and the movable gear 20. |
