| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed reducer which can enhance the rigidity of a rotating shaft while permitting the attachment of a bearing to an eccentric cam.SOLUTION: A speed reducer 1 comprises a ring gear 21, a first revolution gear 23 engaged with the ring gear 21, and a first eccentric cam 31 arranged in a center position of the first revolution gear 23, and also comprises a first rotating shaft 3 which turns around a center axis A, and a ring-shaped first bearing 51 interposed between the first revolution gear 23 and the first eccentric cam 31. The first rotating shaft 3 has the first eccentric cam 31, a shaft 35 and a connecting part 36 for connecting the shaft 35 and the first eccentric cam 31. In a planar view with the center axis A as a normal line, the shaft 35 has a portion extruding to the outside from the first eccentric cam 31, and the connecting part 36 is wholly positioned in a region in which the shaft 35 and the first eccentric cam 31 are overlapped on each other. |
