Study of Transmission Efficiency Simplified Calculation of 2K-H Differential Gear Trains

2K-H(A) differential gear trains are taken as an example,by analyzing input output combination and angular velocity relation of three basic components.Twenty-four of them of transmission schemes are gained,but only eight of them are rational by validating.According to angular velocity direction of gears,final transmission efficiency simplified formulas are induced.By the formulas,according to the efficiency and transmission ratio in the transformation gear train,the efficiency of differential gear train can be easily gained without the judgment of meshing power flow direction.The formulas are also fit for other 2K-H differential gear trains.