Abstract: Based on the analysis of the structure and working principle of the flexible pins, the dynamic model of planetary gear transmission of wind turbine gearbox is built. Time-varying mesh stiffness and mesh phasing with pins error are considered together to analyze the effects of pin stiffness and pins error on the load sharing. The results show that the load sharing is perfect in the flexible pins system, reduce pin stiffness can obviously reduce the maximum load percentage of planet gear and improve the load sharing. It is also showed that pin tangential error is sensitive to load sharing, and pin tolerance of adjacent pairs of planets in the same direction is best for the load sharing from the design viewpoint. The load sharing experimental studies of planetary gear transmission of wind turbine gearbox are performed on the professional test setup. The experimental results compare well with the theoretical results, verifying the theoretical method.

Key words: wind turbine gearbox;planetary system;flexible pin;dynamics;load sharing