Method for improving load uniformity of closed differential planetary gear train

The invention relates to a method for improving the load uniformity of a closed differential planetary gear train, which is applied to a coaxial double-rotor helicopter speed reducer closed planetary gear. Comprising a fixed-axis planetary gear train assembly method, a design key point, a star wheel tooth surface coordinate point acquisition method, a measurement data processing method, a method for drawing a tooth curve by using measurement data, a star wheel angular error measurement method and the like. By means of the method, the uniform load index can be quantified, the reasonable quantitative index can be achieved through installation and adjustment, the assembly quality of the closed differential planetary gear train and the speed reducer installed on the closed differential planetary gear train is guaranteed, the assembly efficiency of the closed differential planetary gear train is improved, faults such as overlarge vibration or other problems in the working process are avoided, and the reliability o