Numerical Simulation And Experimental Analysis Of Temperature Rise Characteristics Of Angular Contact Ball Bearing Under High-speed Running

The temperature rise characteristics of angular contact ball bearing are mainly related to the actual working conditions and the structural parameters of the bearing.The temperature rise of bearing determines the performance and life of bearing,which will affect the reliability of the machine.Under high-speed running,because of the intense friction and heat generation between the internal parts of the bearing,the temperature of the bearing will rise,and even caused premature fatigue failure,sticking and gluing of the bearing,which will lead to the shutdown of the equipment.Therefore,the research on the temperature rise characteristics of angular contact ball bearings under high-speed running has important engineering application value.In this paper,angular contact ball bearing is taken as the research object.Based on the analysis of the factors affecting for the temperature rise and pseudo-dynamics of rolling bearing,the heating generation model of angular contact ball bearing is established.The local method is used to calculate the heat generation of high-speed angular contact ball bearing,including the spin,lubricant traction,differential sliding of steel ball and ring,friction of steel ball and cage pocket and friction of cage and guide surface of ring.The result shows that the proportion of spin heat generation is the largest,and the proportion of friction heat generation between cage and guide surface of ring is the smallest.The spin heat generation of bearing increases obviously with the increase of rotational speed or axial load,but the change of heat generation caused by other heat sources is not obvious with the change of rotational speed or axial load of bearing.A three-dimensional model of two-piece inner ring angular contact ball bearing is established.The calculation results of heat generation by bearing are taken as the thermal load conditions of numerical simulation.The temperature rise characteristics of high-speed angular contact ball bearing are analyzed by finite element method.The temperature distribution nephograms of bearing under different working conditions are obtained.The results show that the temperature of the bearing decreases gradually along the contact point between the ball and the inner raceway.The highest temperature distributes at the contact point between the ball and the inner raceway,and the lowest temperature distributes on the outer side of the outer ring.With the increase of the rotational speed,the temperature of the bearing increases gradually.The temperature of the bearing increases with the increase of axial load.The influence of the radial force on the temperature of the bearing is not obvious.The temperature rise test of bearing is studied by using the double rotor angular contact ball bearing test machine,which is developed by our research group.Infrared temperature sensor is used to measure the temperature of bearing under different rotational speed and load conditions.The test results show that the changes of rotational speed,axial force and radial force will cause the temperature rise of bearing,and the changes of rotational speed and axial force have significant effect on temperature rise,while the changes of radial force have no obvious effect on the temperature rise of bearing.The rationality of the numerical simulation method is verified by comparing the temperature results of test measurement and numerical simulation.The temperature rise law of two-piece inner ring angular contact ball bearing under different working conditions is analyzed.