Finite element modeling reveals that differential tooth surface modification enhances meshing performance in coaxial gear systems, indicating improved efficiency.
The coaxial torque-splitting face gear transmission is an important part of the main reducer transmission system of new-generation helicopters, which has a complex system structure, large transmission power, and multi-factor coupling characteristics. It is highly challenging work to modify the tooth surface of the gear in such a complex gear transmission system to improve the meshing performance. This paper first introduces the structure and typical working conditions of torque-splitting face gear transmission and analyzes its power flow direction. Then, a finite element model for contact analysis of coaxial torque-splitting face gear transmission considering multi-factor coupling was established to investigate the deformation of the system based on bearing support stiffness, casing deformation, temperature deformation, and tooth thickness deviation. Further, the idea of differential tooth surface modification is proposed by analyzing the coupling relationship among modification parameters of each gear pair in the system. Finally, the optimal tooth surface modification scheme was obtained by iterative optimization based on the idea of differential tooth surface modification, and compared with the conventional modification scheme. The results show that the differential modification idea proposed in this paper can effectively improve the meshing performance of the gear pair in the torque-splitting system.
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Zhang et al. (2025) studied this question.