Abstract: In order to solve well the problem of instable operation drive system in top drive device under special working condition, an LK500-type top drive is taken as research object to analyze the real-time dynamic characteristics of its drive system. A three-dimensional model of the transmission system and a finite element model of the major gear wheel on gear shaft are established, the modal analysis and harmonic response analysis of the major gear wheel on gear shaft is carried out with the help of analysis software Ansys-Workbench, and the influence of the flexibility of gear shaft on meshing force and meshing error of the gear pairs is analyzed by using ADAMS. The results show that the excitation frequency of the system should be as far as posible from the inherent frequency of the gears to make the operation of the drive system even more smooth. However, when the gear shaft is a flexible one, its influence on meshing force between gears will less and meshing error greater, so that making the system to vibrate and having influence on the smoothness of the system operation. The simulation result will provide reference for studying the dynamic performance and optimal design of the top drive gear transmission system.

Key words: top drive device, drive system, dynamic characteristics