Research On Bearing Load Distribution And Modification Technology Under Different Contact States For Tapered Roller Bearing Of High Speed Train Axle Box

Roller bearing is an important mechanical equipment components.The role of bearing is to support the mechanical rotating body,and to reduce friction between contact faces.For recent years,with the development of high-speed rail industry,improving train bearing life is a hot topic.Bearing load distribution which is one of the factors that affect the bearing life was chosen as the first research object in this paper.A discrete algorithm was proposed,improved the traditional algorithm of bearing load distribution.With Matlab platform,a program of bearing load distribution based on discrete algorithm is developed.Cylindrical roller bearing was taken as an example,researched the load distribution under different working conditions and clearance conditions in new discrete algorithm.At the same time,the results of different load distribution based on the discrete algorithm and the traditional algorithm are compared,The feasibility and reliability of the discrete algorithm are verified.The load distribution under radial load of cylindrical roller bearing and axle box tapered roller bearing was also studied based on e finite element analysis.Load distribution was calculated by continuous function model(conventional method),discrete function model and finite element method according to the internal load distribution theory of rolling bearing.The results of three methods show that the pattern of the internal load distributions is same,but the accuracy is not same.The accuracy of the finite element method and discrete function model is match and the accuracy of the continuous function model is the lowest.The research shows that the life of the bearing is inversely proportional to the power function of the maximum contact stress.In order to improve the service life of the bearing,the maximum contact stress of the bearing should be reduced.To this end,the bearing roller for was crowned by logarithmic curve.In this paper,a variety of different modification schemes are proposed for the modification of the roller body,and a more accurate bearing slice model is established by parametric modeling.For each model,the finite element analysis is carried out by comparing the equivalent stress and the contact stress between different mating clearance and different working conditions.Also,the improvement of the life of the crowned bearing was analyzed.