Sensitive parameter and its influence law on load sharing performance of cylindrical gear split torque transmission system

The split-path transmission, particularly attractive alternatives to the traditional epicyclic gear transmission of the helicopter, provides two parallel pathways for transmitting torque from the engine to the rotor. The key technical index of the split path designis to equalize the torque in each path as much as possible. Therefore, it is necessary to study the sensitive design parametersaffecting load sharing characteristics. In order to obtain the utmost sensitive parameters and the change law of the effects, a coupled dynamic analysis model considering the time-varying meshing stiffness, mesh errors and mesh damping, is established for the split torque transmission system. Taking support stiffness and torsional stiffness as variables, the sensitivities of load sharing coefficient to these parameters are calculated and analyzed based on sensitive analysis, and the distribution law of the sensitivities of load sharing coefficient is obtained. Results show that load sharing coefficient has a higher sensitivity to the torsional stiffness and the support stiffness of duplicated gear shafts, but lower to input shafts and output shaft. Furthermore, reducing torsional stiffness or increasing two lateral support stiffness of duplicated gear shaft will yield the same results and are contributive to the improvement of load sharing