The face gear power-split system has huge superiorities over the traditional transmission form in the application of modern rotorcraft, and it has become the research trend of the industry in recent years. Thus this paper took the double input face gear split-parallel transmission system used in the rotorcraft as the research target, and established its dynamics model through the lumped parameter theory. Based on the Newtonian second law, the dynamics equations were built and solved to gain the meshing forces and load sharing coefficients of the transmission system. Simultaneously, the impacts of the eccentric errors, support stiffness, and torsional stiffness on the load sharing characteristics were studied. The results show that the meshing forces and load sharing coefficients of each gear pair have periodic changes; the eccentric errors of each drive stage gear have only a significant effect on the corresponding drive stage. Moreover, the changes in the support stiffness of the split-torque shafts and double gear shafts mainly affect the load distribution of the parallel stage, and the shaft torsional stiffness is less sensitively to maintain load balance. In addition, the increment of the shaft stiffness increases the load sharing coefficients of the corresponding gear pairs.

面齿轮动力分流系统在现代旋翼机的应用中相对于传统传动形式有着巨大的优势，已成为近年来行业的研究趋势。因此本文以旋翼机所用的双输入端面齿轮分平行传动系统为研究对象，通过集总参数理论建立其动力学模型。基于牛顿第二定律，建立并求解动力学方程，得到传动系统的啮合力和均载系数。同时，研究了偏心误差、支撑刚度和扭转刚度对载荷分担特性的影响。结果表明，各齿轮副的啮合力和负荷分担系数具有周期性变化；每个驱动级齿轮的偏心误差只对相应的驱动级有显着影响。而且，分扭矩轴和双齿轮轴的支撑刚度变化主要影响并联级的载荷分布，轴扭转刚度对保持载荷平衡的敏感性较低。此外，轴刚度的增加增加了相应齿轮副的负载分担系数。