Temperature Rise Characteristics And Experimental Research Of Railway Axle Box Bearings

As an important part of mechanical transmission,bearings are important supports for rotating parts and widely used in various fields.Railway axle box bearing is an important part of the train travel section.The distribution of temperature field and the temperature rise under different working conditions affect the service life of the bearing and the driving safety of the train.For example,the frequent failures of trains such as hot-cutting shafts,burning shafts,and thermal deformation are affected by the bearing temperature distribution.The research on the bearing temperature field mainly uses the thermal network method,the finite element method and the test method.In the thermal network method,a hot node represents the temperature of a corresponding part in the system,but it does not truly reflect the bearing in operation.The true temperature distribution;the test method can not analyze the mechanism of bearing temperature rise,and the cost is high.In this paper,based on the relationship between load and deformation,the load distribution of axle box bearing is analyzed.Then,according to the moving speed of the inner and outer ring relative to the roller,the local heat source method is introduced to calculate the friction heat between the roller and the inner and outer raceway at different positions.Finally,according to the basic theory and numerical solution of heat transfer,the mathematical calculation model of three-dimensional steady-state temperature field of axle-box bearing is established,and the accuracy of the theoretical model is verified by the thermal experiment of railway axle-box bearing.The factors affecting the bearing temperature are analyzed.The main conclusions of this paper are as follows:1.For railway axle box bearings under the same working condition,the theoretical results are compared with the experimental data.the results show that the calculated temperature distribution trend is basically consistent with the experimental results,and the difference between the theoretical calculated results and the experimental data is less than 20%.The accuracy of the three-dimensional steady-state temperature field calculation model of axle-box bearing established in this paper is verified.2.Through the theoretical calculation and the temperature distribution trend measured by the test,it is concluded that because of the particularity of the bearing mode of the axle box bearing,the temperature of the railway axle box bearing has a temperature difference along the circumferential direction,showing a trend of high up and low down,and along the radial direction,The temperature at the contact between the roller and the outer raceway is the highest,and the temperature at the contact between the roller and the inner raceway is the second.3.In the load-bearing area,the inner surface temperature of the outer ring raceway on the radial load action line is the highest,and the outer ring temperature of the railway axle box bearing is symmetrically distributed along the node;4.The temperature difference in the circumferential direction of the outer ring of the railway axle box bearing increases with the increase of the radial load and decreases with the increase of the axial load.