Railway Bearings Protruding Degree Of Design And Thermal Stress Analysis

The car-body train system, as a core train system, plays an important role in the train operation.Along with the speed of the train operation, the study of car-body bearing is of great importance.The finite element model has been established to research the contact stress behavior in theservice of the state, where the railway cylindrical roller bearing is taken as the research object. Inthis model, the rollers use logarithm mother line to change the roller convex metric. The result ofnumerical analysis shows that: when the roller is in straight mother line, there will be greater edgeconcentrated force at both roller ends. Along with the increase of the protruding degree, the edgestress will be gradually decreased; when convex metric has been increased to16μm, contact stressslowly begins to increase, at this time the contact stress distributes ovally.At the same time, a finite element model has been established in this thesis based on the doublerow circular cone roller bearings of high speed train, and the distribution of the load has also beenstudied in different axial force; In addition, the stress performance of bearing has been studied indifferent temperature. The results show that: the axial force makes the bearing load distributionfocus on the end of pressed roller, when the axial force reaches to a certain value, the other row ofroller will be out of contact. Under the influence of the temperature and the load, the contact stressof bearing has been greatly increased.Conclusion: in the design process, the roller edge stress will be decreased with the adoption ofthe logarithm mother line and reasonable convex metric; the bearing should be well lubricated whenused to prevent over-increasing the contact stress of bearing which leads to its shorter service life.