Patent ID: 8517879
Filing Date: 2013-08-27
Classification: F16H

Abstract:
1. A multi-stage reducer comprising a plurality of reduction parts each comprising an input shaft to which a rotation from a drive source is input, a cam provided on the input shaft, an external gear which is supported by an outer periphery of the cam and which revolves around a rotation center of the input shaft, a carrier which is coupled with the external gear and which is linked with a rotation movement of the external gear, and an internal gear which is meshed with the external gear and which rotates around the rotation center of the input shaft, the multi-stage reducer being configured to reduce the rotation from the drive source at a predetermined reduction ratio based on a difference between a number of gear teeth of the external gear and a number of gear teeth of the internal gear and to output the rotation having undergone speed reduction from either one of the internal gear and the carrier, wherein the plurality of reduction parts includes: a first-stage reduction part to which the rotation from the drive source is input; and a second-stage reduction part to which the rotation having undergone speed reduction by the first-stage reduction part is input, and the second-stage reduction part is disposed on an outer circumference of the first-stage reduction part.