Research On Roller Convex Metric Of Cylindrical Roller Bearing Based On Thermal-mechanical Coupling

When the cylindrical roller bearing rotates at high speed,a large amount of heat is generated between various components due to friction,which leads bearing temperature rise,all components of the bearing expand,clearance between bearings reduced,stress increased,and wear intensified,the service life of the bearing affected.At the same time,due to the unreasonable design of the roller generatrix,the stress concentration will occur at the place where the roller and the raceway contact in the running process,which will lead to the damage of the roller and the ring to different degrees and reduce the fatigue life of the bearing.So reasonable design of roller convex metric of cylindrical roller bearing is an important means to improve the working performance and reliability of bearing.Therefore,it is of great significance to analyze the temperature rise and study the mechanical properties of cylindrical roller bearing.In order to study the temperature rise of the bearing,it is necessary to make clear the friction power consumption between the bearing components,which is generated by the interaction of the internal components of the bearing.In this paper,the dynamic simulation model of cylindrical roller bearing is established based on the principles of rolling bearing dynamics,contact mechanics and tribology.On this basis,the friction power consumption model of bearing is established to obtain the variation rule of friction power under different working conditions.The temperature field of the bearing was solved by using the friction power consumption.Meanwhile the temperature field was considered as the boundary condition of thermal-mechanical coupling to study the influence of different convex metric of rollers with logarithmic generatrix modified on the bearing's mechanical properties under different working conditions.The main conclusions of this paper are as follows: 1.Different working conditions and structural parameters have great influence on friction power consumption of cylindrical roller bearings.2.The increase of rotational speed and radial load will lead to the increase of temperature of cylindrical roller bearings.The highest temperature occurs at the contact point where the roller contacts the inner ring.3.Considering the effect of thermal-mechanical coupling,there exists an optimal convex metric of logarithmic generatrix modified roller,which can avoid the edge stress effect.4.Considering the thermal expansion caused by bearing temperature rise,the maximum contact stress between roller with inner rings and outer rings is larger than that without considering coupling.The optimal convex metric of logarithmic generatrix modified roller is also different.5.Different working conditions and structures parameters have influence on the selection of the optimal convex metric,so in the actual design of cylindrical roller bearings,the convex metric of bearings can be optimized according to the specific working conditions,then it can to improve the fatigue life of bearings to a certain extent.6.Through the temperature rise test of cylindrical roller bearings,the results of thermal analysis are verified to be reliable,which can provide more precise guidance for the optimal design of roller convex of bearings.