本文阐述了链条作为机构元件的广泛用途和链条机构的特点;介绍了各种常用链条机构和链条行星减速器、链条谐波传动的工作原理和结构特点。 This paper describes the chain as a mechanism of the wide range of components and the characteristics of the chain mechanism; introduced a variety of commonly used chain mechanism and the chain planetary reducer, chain harmonic drive working principle and structural characteristics.