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A Study on Power Flow and Meshing Efficiency of 3K Type Planetary Gear Train

It is difficult and complicated to analyze the power flow of 3K type planetary gear trains and deduce their efficiency formulas. In this paper, this kind of epicyclical gear train is first decomposed into three simple train units of K H type; then these units are put into kinematic analysis and moment analysis, and finally the equations are listed and solved. Thus not only is a new general efficiency formula obtained and the diagrams for the power flow are drawn up, but also the circulation power is found in this kind of train. This is the cause of the low efficiency for this kind of epicyclical gear train. At the same time, it is demonstrated that the decrease of the ratio between the circulation power and the output power can increase the efficiency of 3K type planetary gear trains.