建立了非等模数非等压力角NGW型行星齿轮系的计算模型，针对各齿轮的偏心误差和齿频误差，运用当量啮合误差原理和浮动构件的动力平衡关系，推导出了系统的动力学方程；对方程进行求解并将其与等模数等压力角齿轮系进行比较，同时讨论了太阳轮（或内齿轮）压力角、齿轮误差对该系统均载特性的影响。分析结果表明，非等模数非等压力角行星齿轮系设计时，通过确定合适的齿轮压力角，能够使系统具有较好的均载特性；太阳轮浮动支撑机构可以改善系统均载性能；转速对系统的均载有较大的影响，相同转速下的非等模数非等压力角设计有着较好的均载效果。

An analytical model for NGW planetary gear train with unequal modulus and pressure angles was presented in the dynamic way. In consideration of the eccentric error and tooth-frequency error of parts, the dynamic equation of each planet was found by using the theory of equivalent mesh error and the principle of dynamic equilibrium. After equation being solved, the load sharing characteristics was compared with the normal gear transmission. The load sharing behaviors were analyzed and compared by the values of the sun and the ring pressure angles, the difference of the gear error. The analysis results indicates that planetary gear train which is designed by the suitable pressure angles can improve the load sharing behavior, the floating sun-gear can make it better too, and the rotating speed influences the load sharing greatly, a better load sharing effect can be achieved for theirs unequal modulus and pressure angles under the same rotating speed.