本文讨论了链传动中克服和消除多边形效应的新途径。利用包络原理,求出平动时链传动的齿形。传动中链轮齿和链节齿在最后啮合点一道旋转,实现变节距或定节距传动。並提出了用“包络—轨迹”对平动齿形进行修正,传动中链节体的前铰链沿圆弧运动,后铰链作平动,完全消除链传动中的多边形效应。最后提出了对结构设计产生影响的几种啮合情况。 This article discusses new ways to overcome and eliminate polygon effects in chain drives. By using the envelope principle, the tooth profile of translational chain drive is obtained. Drive the chain teeth and chain teeth in the last meshing point to rotate together to achieve variable pitch or fixed pitch transmission. In addition, it is proposed to modify the translation tooth profile with “envelope - trajectory”. The front hinges of the middle links in the transmission move in a circular arc and the rear hinges are in translation, so as to completely eliminate the polygon effect in the chain transmission. Finally, several kinds of meshing situations that affect the structural design are proposed.