Reducing chain link and reducing chain

The utility model relates to a variable-diameter chain link and a variable-diameter chain, the variable-diameter chain link comprises two symmetrically arranged straight arm sections and two symmetrically arranged arc sections, and transition sections are formed at the joints of the straight arm sections and the arc sections; reducing parts are arranged on at least two arc sections, and the sectional area of the reducing parts is larger than that of other parts of the chain link. The variable-diameter chain is composed of variable-diameter chain links. By arranging the reducing part, the stress condition of the chain can be improved, the related performance is improved, the service life is prolonged, and the use cost is reduced. 本实用新型涉及一种变径链节及变径链条，所述变径链节其包括两对称设置在直臂段和两对称设置在圆弧段，所述直臂段和所述圆弧段连接处形成过渡段；至少在两个所述圆弧段上设置有变径部，所述变径部的断面面积大于链节其他部位的断面面积。变径链条由变径链节组成。通过设置变径部可改善链条的受力状况，改善相关性能，提高使用寿命，降低使用成本。