Analysis Of Load Sharing And Stress Characteristics Of Planetary Gear System Components Of Wind Turbine

The design of planetary gear system components is closely related to the performance of wind turbine gearbox, where load sharing properties directly affect the stationary and reliability of the gearbox transmission. From the view of design, load sharing properties of planetary gear transmission is studied in this paper, the effect of each main error which changes dependently on the load sharing coefficient is analyzed, and the load sharing coefficient of planetary gear transmission system is calculated in view of750kW wind turbine.In the planetary gear transmission, the deformation of planet gear and planet carrier which is under loads plays an important role on systemic load sharing properties. However, there was lack of relevant design approach in the past. Aiming at this problem, the stress and deformation of these two key components are analyzed. For the planet gear, the deformation of its rim could cause the deformation of gear tooth, thus affecting meshing force uniformly distributing along the tooth width direction, while the deformation of rim also has an influence on the systematic load sharing properties. In this paper, the stress formulas of planetary rim are derived based on the elastic theory, the changing trend of maximum hoop stress fallowing the increasing thickness of rim is analyzed, and the changing trend of maximum hoop deformation fallowing the increasing thickness of rim is analyzed by ANSYS, thus verified the validity of the results obtained by theoretical approach.Planet carrier is the component standing under biggest load in the planetary gear transmission and even the entire gearbox transmission of wind turbine, so it is necessary to analyze its stress and deformation. The analysis results of the planet carrier show that the stress value is low relatively and the deformation value is large. Elastic deformation is beneficial to enhancing the systematic load sharing properties, but larger deformation could not only affect meshing force uniformly distributing along the tooth width direction, but also reduce the stiffness of the planet carrier. It is concluded that the elastic deformation of key components should be considered in designing the wind turbine gearbox, under the condition of ensuring strength and stiffness to increase the systematic load sharing properties.