This paper describes a new type of planetary gear drive with a high reduction ratio. The planetary gear drive is mechanically similar to a 2K-H type planetary gear, which has two sun gears and one carrier. The planetary gear drive has two pairs of an arc tooth profile gear and a pin roller, which mesh with each other. The planetary gear drive has little backlash, a high efficiency, a long fatigue limit, etc., because the tooth contact holds on concave and convex surfaces. In this study, we measured the vibration acceleration, the transmission error, the gear noise, and the efficiency on the new type planetary gear drive by the running tests. We discuss and report on the driving performance of the planetary gear drive.
