By analyzing the operating conditions of 4 gears shafts of Simpson planet gear transmission on Toyota A140E model, the calculating method for rotational speed of different gears is presented.

• 在分析了丰田A140E型四挡辛普森式行星齿轮变速器工作状态的基础上，给出了各挡位输出轴转速的计算方法。