INSCRIBED TYPE PLANETARY GEAR DEVICE

To suppress undesigned eccentric oscillation of an internal gear to a fixed member and suppress degradation of a ratio of meshing between the internal gear and an external gear, in an inscribed-type planetary gear device.SOLUTION: In an inscribed type planetary gear device having a fixing member 10, an output shaft 34 rotatably supported by the fixing member 10, an internal gear 22 connected to the fixing member 10 in a manner of enabling translation motion by a circular locus through a connection mechanism 50, and an external gear 40 coaxially connected to the output shaft 34 and inscribed and meshed with the internal gear 22 with a prescribed eccentric amount, the connection mechanism 50 includes a connection pin 56 fixed to the fixing member 10 and extended in an axial direction of the internal gear 22, and a round hole 52 formed in the internal gear 22 and receiving the connection pin 56 with a play amount corresponding to the eccentric amount.SELECTED DRAWING: Figure 2 【課題】内接式遊星歯車装置において、固定部材に対する内歯歯車の偏心揺動が設計通りに行われなくなることを抑え、内歯歯車と外歯歯車との噛み合い率の低下を抑制すること。【解決手段】固定部材１０と、固定部材１０に回転自在に支持された出力軸３４と、固定部材１０に対して連結機構５０を介して円軌跡による並進運動可能に連結された内歯歯車２２と、出力軸３４に同軸的に結合され、内歯歯車２２に対して所定の偏心量をもって互いに内接して噛合した外歯歯車４０とを有する内接式遊星歯車装置であって、連結機構５０は、固定部材１０に固定されて内歯歯車２２の軸線方向に延在する連結ピン５６と、内歯歯車２２に形成され、前記偏心量に対応する遊び量をもって連結ピン５６を受容する丸孔５２とを含む。【選択図】図２