Research On The Fatigue Life Of Road Milling Planer Steering Axle Key Structure

Road milling planer is one of the main models of asphalt pavement maintenanceconstruction machinery, it mainly used for excavation and renovation of highway, urban road,airport, freight yard asphalt concrete surface layer,and it also be used to remove surface wavebeat, oil, checker, defects such as rutting, can also be used to pit excavation pavement grooveand the groove, and cement road surface roughening and surface milling flat wrong. Steeringaxle is the key structure components of milling planer machine transmission system, the dynamicanalysis and the result can improve the transmission performance, shorten the development cycle.In this paper, the key component of steering axle (double fork and the spiral bevel gear reducer)for finite element analysis and fatigue life prediction, the results of the study for the preventionto fatigue damage of steering axle components, improve and optimize the steering axle structure,increasing the use of security, upgrade the quality of milling planer is of great significance.This article main research content includes:1) Establish milling planer steering axle drive assembly3d geometric model, consideringthe double fork structure’s steering and transmission torque role in practical work, as a flexiblebody, combined with UG, ANSYS and ADAMS, the coupled dynamics virtual prototype modelis established, and the dynamic characteristics of components is obtained based on simulation,such as the main speed reducer the bevel gear on the force, velocity, acceleration characteristics,the simulation results accord with theory;2) Double fork in the steering axle and the main reducer respectively transient dynamicsanalysis and finite element contact analysis. In double fork transient dynamics analysis, based onthe ADAMS of the double cross key nodes load spectrum, get double fork in the ANSYSanalysis the stress field and displacement field and stress time history of the danger zone node,concluded that the strength of the double fork is lower than yield strength; Bevel gear do staticcontact finite element method of main reducer, the analysis is driven gear contact surface contactstress and master-slave dynamic bending stress of gear, the simulation results are consistent withtheoretical calculation,and it predicts fatigue life of the spiral bevel gear reducer;3) Respectively for double fork and the spiral bevel gear reducer for fatigue life prediction. Associated load spectrum of the transient dynamics analysis, considering the main factorsinfluencing fatigue strength component, define the S-N curve of the artifacts, choose Minerlinear fatigue cumulative damage theory to estimate the fatigue life of double fork, thesimulation results and theoretical results are basically identical.