通过对由移动副组成的带传动、链传动这类特殊机构的自由度计算的分析,总结出平面机构自由度计算公式在不同的情况下要作具体分析,具体应用。 Through the analysis of the degrees of freedom calculation of special mechanisms such as belt drive and chain drive composed of moving pairs, it is concluded that the formula of freedom degree of plane mechanism should be analyzed and applied in different situations.