| 摘要 |
A reduction gear having high transmission efficiency is obtained by performing position restriction in an axial direction of an externally toothed gear which is rotatably externally fitted to a shaft, with a configuration having small sliding resistance. A reduction gear (G1) has an input shaft (16), an externally toothed gear (26) which is externally fitted to the input shaft (16), and a bearing (B2) which is disposed between the input shaft (16) and the externally toothed gear (26), in which the externally toothed gear (26) serves as an outer ring of the bearing (B2), and axial movements of rollers (62, 63) of the bearing (B2) are restricted by an inner ring (a first position restriction member) (60) fixed to the input shaft (16) and a snap ring (a second position restriction member) fixed to the externally toothed gear (26), whereby an axial movement of the externally toothed gear (26) with respect to the input shaft (16) is restricted. |
