ECCENTRIC OSCILLATION-TYPE REDUCTION GEAR

To provide an eccentric oscillation-type reduction gear which can make a flow of a lubricant to, in particular, a radial direction smooth.SOLUTION: An eccentric oscillation-type reduction gear comprises an input rotating body, a first rotating body, a second rotating body, a planetary rotating body (24), a flow passage, a contact part (20), and a radial-direction escape groove part (29). The flow passage includes an axial-direction clearance between the planetary rotating body and a contact member contacting with the planetary rotating body in an axial direction, and allows the circulation of a lubricant by a centrifugal force. The contact part includes a planetary rotating body end face (25) formed between power transmission paths from the planetary rotating body up to the second rotating body, and located at the second rotating body side of the planetary rotating body, and a second rotating body end face (26) opposing the planetary rotating body end face of the second rotating body. The radial-direction escape groove part constitutes a part of the flow passage, and is formed communicatively from an internal periphery up to an external periphery over a radial-direction width of the planetary rotating body end face.SELECTED DRAWING: Figure 2 【課題】特に径方向への潤滑油流れを円滑にすることが可能な偏心揺動型減速装置を提供する。【解決手段】偏心揺動型減速装置は、入力回転体と、第１回転体と、第２回転体と、遊星回転体（２４）と、流路と、接触部（２０）と、径方向逃がし溝部（２９）と、を備える。流路は、遊星回転体と当該遊星回転体と軸方向に接触する接触部材との軸方向隙間を含み、遠心力により潤滑油が流通可能である。接触部は、遊星回転体から第２回転体への動力伝達経路の間に設けられ、遊星回転体における第２回転体側の遊星回転体端面（２５）、第２回転体における遊星回転体端面と対向する第２回転体端面（２６）を含む。径方向逃がし溝部は、流路の一部を構成し、遊星回転体端面の径方向幅に亘って、内周から外周まで連通して形成されている。【選択図】図２