4、missiondesignIchoseNGW-planetarygeartransmission.First-classIuseoffixedgear,and the Planet-export.Second-classIUsingplanetaryfixed,andofgearexport.Planetarygeartransmissioncansharetheloadofplanetaryround,so transmissionstructuremorecompact.Tobringintofullplaytheadvantagesofplanetarygeartransmissi