Analysis Of Gear Transmission Characteristics And Flow Field Characteristics Based On Fluid Structure Coupling

Cylindrical gear transmission system has the characteristics of strong bearing capacity and stable meshing,so it is widely used in the reduction box of aerospace,transportation and other fields.The transmission efficiency and stability of its gear pair are the basis for the stable operation of the reduction box.The transmission efficiency,dynamic performance and even energy consumption of components have a decisive influence,and the power loss caused by the lubrication resistance effect of the gear pair rotating in the oil bath is an important part of the transmission loss.In addition,the interdisciplinary fluid-solid coupling The solution method has been used in more and more multi-field problems since its discovery,and how to make the gear pair run smoothly,safely and efficiently under the load environment has made more and more researchers invest their energy in it The factory provides the internal gear pair of a certain type of reducer.From the perspective of fluid-solid coupling,the gearing oil loss is used as the starting point to establish a corresponding model.After obtaining the simulation results,compare the power loss of the single gear of the internal and external meshing gears,and compare the different gearing methods.The oil loss of the gear pair is analyzed on the basis of the multi-phase flow fluid domain,and the flow field under different working conditions is analyzed.Characteristics,and finally the fluid-solid coupling analysis based on the flow field analysis results,in-depth study of the flow field distribution,oil stirring loss and stress-strain based on fluid-solid coupling under the influence of multiple factors,the fluid domain and solids of the rotating machinery in the shell Domain analysis has practical application significance.The main research contents of this article are as follows:The slip mesh method was used to simulate the oil stirring of the external gear and internal gear pair key gears,and the flow field characteristics,oil stirring power loss,and its generation mechanism and influence parameters were analyzed.Based on this,the two meshing methods were separately The gear pair is simulated by oil mixing,and the flow field characteristics and oil power loss are analyzed and compared,and the influence rules of gear speed,tooth width,and meshing mode on oil distribution,pressure and speed flow field characteristics are obtained.The gas-liquid two-stage oil stirring simulation analysis of the external gear pair at different oil levels was performed,and the flow field characteristics and oil stirring power loss were analyzed.The fluid-solid coupling method is used to analyze the stress and strain of the gear transmission system to study the equivalent stress and strain of the gear in the process of oil stirring and meshing,and draw the maximum stress value curve according to different working conditions.After analysis,it is found that the fluid pressure load on the structural stress Strain has a great influence,and the equivalent stress and equivalent strain change trend is the same.The maximum equivalent stress changes with the "m" type of oil in the meshing area and then decreases and then increases.Under the design conditions,full oil can be obtained The difference between the equivalent stress in the state and the semi-oil state is very small,and it is positively related to the speed but non-linearly related.