| 摘要 |
An inscribed planetary gear device usable as a speed reducer or an overdrive has a primary shaft which serves, for example, as an input shaft, an externally-toothed gear carried at an eccentricity by the primary shaft; an internally-toothed gear inscribed by the externally-toothed gear; and a secondary shaft which serves, for example, as an output shaft and connected to the externally-toothed gear, through an Oldham's ring which transmits to the secondary shaft only the rotation of the externally-toothed gear taking place about the axis of the externally-toothed gear. The externally-toothed gear is provided with a counter flange at an end facing the Oldham's ring and is operatively connected to the Oldham's ring through Oldham's projections and Oldham's grooves receiving Oldham's projections provided on the Oldham's ring and the counter flange, respectively, or vice versa. The externally-toothed gear is formed by metal powder injection molding and, during sintering process, is placed on a furnace bed while contacting the counter flange with the furnace bed. In this manner, the sintered gear is prevented from being distorted.
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