Research On Temperature Rise Of Ceramic Ball Bearings Based On Spin Frictional Power

Compared with traditional all steel ball bearings, ceramic ball bearings have advantages of higher limiting operation speed, higher limiting temperature, lower requirement of lubrication, longer fatigue life and more adaptive of operation condition. The heat generation of ball bearing is rapidly increased with increase of rotating speed. The excessive heat may worsen the bearing's operation conditions and performance parameters. These then directly affect the accuracy and capability of the rotating axle. Thus, the thermal analysis of ceramic ball bearing appears to be really necessary to the selection, analysis, optimal design and manufacture.Considering friction of ball on both inner and outer ring, the quasi-dynamic theory is adopted to calculate the kinematic and dynamic parameters of the bearing. Some internal parameters are fitted more accurately to speed up the solving program.The spin speed, spin frictional moment and spin frictional power of a ceramic ball is calculated by the parameters obtained from the last step.Converting the whole spin frictional power of all ceramic balls to surface heat source, a finite element model to thermal analyze the ceramic ball bearing. After validating the finite element model, the effect of axial load, rotating speed and frictional coefficient to the ball spin angular speed, spin frictional moment and spin frictional power and raceway temperature rise is studied.The results show that when the axial load is increased, the spin speed of ball on inner race decreased while that on outer nearly remain unchanged. Compared to the other two parameters, the rotating speed has more effect on spin frictional moment. Compared to the outer race, the spin frictional power of ball on the inner race and the temperature rise of inner race are greatly affected by all the three operating parameters.