Study Of Load Sharing Behavior In Two-stage Star Helical Gear Train

Two-stage star helical gear train has more star gears to share the load and power split. Its advantages are small, light and strong carrying ability. Because it's the fixed axis gear train, the system'stiffness, strength and operational reliability are high. This transmission is widely used in the form of wind power in a gearbox. However, due to the production assembly process, the inevitable will produce manufacturing and installation errors. So the star gear load is different. The load sharing of two-star helical gear train is important to be studied. This paper studies the load sharing of two-star helical gear train from the statics, dynamics and finite element point of view and analyzes the relationship between error and load sharing. The calculation software of load sharing is developed according to the related theory.Firstly, the errors in the two-star helical gear train is analyzed and the errors in the system are determined about all gear manufacturing errors, installation errors and tooth thickness errors, bearing manufacturing errors, double star wheel at the same time meshing line error. According to the theory of equivalent contact error, the errors are changed to the line of contact.Secondly, the sun gear and the ring gear are taken as the floating components. From the static point of view, the mechanical model of the system is established and the system load sharing is solved. The impact of errors on load sharing and the relationship between errors and load sharing are studied in statics.Thirdly, each part in the system is taken as a component, with considering the inertial force and damping force. From the dynamic point of view, the system dynamics model is created. The impact of errors on load sharing is analyzed and the biggest impact factor and secondary factor are gotten from the analyzing. At the same time, the impact of the stiffness of the system and input rotate speed on load sharing are also studied.Fourthly, the finite element model of system is created and the load sharing of the system is calculated from the perspective of the finite element. The impact of the star gear location errors on the load sharing is analyzed.At last, the calculation software for the load sharing of two-star helical gear train is developed according to the load sharing theory in statics and dynamics with actual usage requirements.