Simulation Analysis And Optimization For A NGW31planetary Gear Reducer Based On Romax

Planetary gear train has been widely applied in fields of aviation, ship and metallurgy. Ithas many merits, such as small size, compact structure, high bearing capacity, large powertransmission and high efficiency etc.. NGW planetary gear train, which consists of a sun gear, aplanetary gear and a fix inner gear, has the characteristics of simple structure, small axialdimension, super manufacturability and large transmission ratio through multistage series. It hasbeen one of the most widely used equipments in driving devices. So, the study of NGWplanetary gear has a great significance in prompting the technology of planetary gear train.In this paper, a NGW31planetary gear reducer will be analyzed. First of all, the researchwill be based on the rigid-flex hybrid model of the NGW31is which was established by RomaxDesigner and take a full account of the influence of various correlation coefficient which causedby the flexibility of planet carrier and gearbox, deformation of axises, bearing windage andbearing stiffness to make a simulated analysis of the operating condition of each dear. Then, arigid model will be established to make a comparative analysis of the simulation results of twomodels, from which rationality and necessity of the rigid-flex hybrid model will be illustrated. Inaddition, intensity checking calculation of input and output shafts will be made. The paper willalso take useful life predication method (which is based on ISO281(1990) method) and RomaxAdjusted Life to analyze static stress of planetary carrier and the useful life of bearings.Secondly, finite element modal analysis of planetary carrier and gearbox will be applied.The analysis will extract first8modals, and the vibration sensitive parts will be found, from thiswe can verify the rationality of the structures design.Finally, the paper will take Romax Designer micro-surface optimization module to makea microanalysis and modification of the surface of sun and planet(No.1) gear. After themodification, the maxim unit length load of gear surface will be decreased by29.4%, stressdistribution of tooth surface contact will be improved and the loading capacity and.useful lifeof the gear will also increased.Through the analysis, the paper will provide a modern design method for gear transmissionsystem of simulation and optimization.