About the problem how to calculate efficiency of differential gear train, in this paper, there is a new idea of "extending a differential gear train to an equivalent closed planetary gear train".
本文就如何计算差动轮系效率的问题，提出将差动轮系扩展成为等效封闭式行星轮系再进行计算的思想。
Interval optimization method is convenient for making the products series. The problem of the number of gear teeth matching in drive train was solved.
区间优化方法便于产品的系列化，可以解决传动系齿轮配齿问题。
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