REDUCTION GEAR

To provide a reduction gear excellent in mountability.SOLUTION: This reduction gear 1 comprises: an output shaft 2 in which a plurality of teeth 2a are formed at an external peripheral face; an eccentric member 3 arranged at an outside-diameter side with respect to the output shaft 2, and having an internal peripheral face which is decentered to the output shaft 2; a plurality of rollers 6 arranged between the output shaft 2 and the eccentric member 3; and a cage 7 for rotatably holding the rollers 6. Everytime the eccentric member 3 rotates one round, the rollers 6 push output shaft 2, the output shaft 2 is rotated to a peripheral direction by an amount of one tooth, and the output shaft 2 is thereby decelerated in speed with respect to the eccentric member 3, and rotates.SELECTED DRAWING: Figure 1 【課題】搭載性に優れる減速機を提供する。【解決手段】本発明に係る減速機１は、外周面に複数の歯２ａが設けられた出力軸２と、出力軸２よりも外径側に配置され、出力軸２に対して偏心した内周面を有する偏心部材３と、出力軸２と偏心部材３との間に配置された複数のローラ６と、ローラ６を回転可能に保持する保持器７とを備え、偏心部材３が１回転するごとに、ローラ６が出力軸２の歯溝を押して出力軸２を一歯分ずつ周方向に回転させることで、出力軸２が偏心部材３に対して減速して回転する。【選択図】図１