上海充通大学 A pair of Gears 1.3P。 The larger the Pb Pb contact ratio,the 0.3P6 0.7Pb0.3Pb more tooth meshed simultaneously 口if:8。=1.3 N1 B1 N2 Single pair Two pairs are engaging 上游充通大 Types of Gear trains Gear trains Gear shaft supporter Fixed Epicyclic Complex 定轴轮系 周转轮系 复合轮系 Non-reverted Simple gear Compound train gear train reverted5  The larger the contact ratio, the more tooth meshed simultaneously  if:  = 1.3 N2 P N1 B1 B2 Pb Pb 1.3Pb 0.3Pb 0.7Pb 0.3Pb D C Single pair Two pairs are engaging A pair of Gears Types of Gear trains Gear trains Fixed 定轴轮系 Compound gear train Simple gear train Epicyclic 周转轮系 Complex 复合轮系 Gear shaft supporter Non-reverted reverted