Abstract: An eccentric orbiting type planetary gear device includes a bearing which requires no pre-load adjustment. The planetary gear device is small in the number of components when compared with the conventional device, and is improved in performance and in assembling efficiency. In manufacturing an eccentric orbiting type planetary gear device in which a supporting block (31) is made up of a supporting member (32) having a plurality of pillar-like portions (32a), and a disk (33), the supporting member and the disk being fastened to each other with fastening members (35) with an external gear (21) between the supporting member and the disk in such a manner the external gear is engaged with an internal gear; the supporting member and the disk are abutted against each other through end faces thereof, and are fastened to each other to form the supporting block, and bearing rolling surfaces (32b) and (33a) corresponding to inner races are formed in the supporting member and the disk at a predetermined interval.

Abstract: The invention relates to an eccentric orbiting type planetary gear device which requires no pre-load adjustment for the bearing, and is small in the number of components when compared with the conventional device, and is improved in performance and in assembling efficiency, and a method of manufacturing the device.