国 上海久通大学 Velocity ratio for fix-axis gear train 3 5= 0=? 05 M 3 3= N3 2 02 N 03 4 = 7 04 Ny = 05 N 1223i34i45= 0.02..-=is 0203040505 = N2NNNs 05 NNzNN 圆上泽支大学 Velocity ratio for fix-axis gear train Product of all b's Tooth Numbers Product of all a's Tooth Numbers i= N-N3NNs 3 NN2NsN. 4 Direction！ 1010 1 2' 3' 4 2 3 4 5 5 1 15 N N N N N N N N i     15 5 1 5 4 4 3 3 2 2 1 12 2'3 3 4 45 i i i i       i            ? 5 1 15     i 1 2 2 1 12 N N i     34 45 3 4 45 43 54 N N i i N N         2' 3 3 2 2'3 N N i     Velocity ratio for fix-axis gear train Product of all Tooth Numbers Product of all Tooth Numbers a' s b' s iab  1 2' 3' 4 2 3 4 5 5 1 15 N N N N N N N N i     Direction！ Velocity ratio for fix-axis gear train