提出利用差动轮系实现功率流半封闭的齿轮试验台的基本原理、载荷特性、效率和运动特性。它兼有系统载荷精度高，工况的自动化模拟响应快，且通过部分功率回流方式，以小功率消耗实现大功率的加载，是集开放功率流式与封闭功率流式齿轮试验台的优点的一种新颖试验台 The basic principle, load characteristics, efficiency and motion characteristics of a gear test bed with semi-enclosed power flow by differential gear train are put forward. It combines the advantages of high system load accuracy, fast automated simulation of operating conditions, and high power loading with low power consumption through partial power return, which is an advantage of the open power flow and closed power flow gear test stand A novel test bench