SPEED REDUCER

摘要

This aims to provide a speed reducer having a supporting member exposed to the two end faces in the direction of an axis of rotation. The speed reducer comprises an internal gear, a carrier, a crankshaft, an external gear and a ring gear. The carrier is arranged coaxially with the internal gear, and includes a pair of supporting members and a carrier pin for connecting the supporting members. The crankshaft is rotatably supported in the carrier, and has an eccentric member and a crankshaft gear fixed thereon.The external gear rotates eccentrically while engaging with the internal gear. The ring gear is arranged coaxially with the internal gear, and includes internal teeth for engaging with the crankshaft gear and external teeth for engaging with an input gear. The outer side faces of the paired supporting members in the rotation axis direction are exposed from the case of the speed reducer.