Analysis on Slipping Performance of Angular Contact Ball Bearings for Micro Turbines
On the basis of Hertz contact theory,the angular contact ball bearings for micro turbines rotating at high speed under combined load and angular deflection are calculated by quasi-static equations.The bearing forces and their slip conditions are obtained under different axial preloads,radial loads and deflection angles.The critical curve for slippage of the bearings is obtained based on Hirano slip criterion.The results show that in order to prevent ball slippage,the bearings operating at higher rotational speed require larger axial preload;when the radial load is not subjected and the axial preload is less than 100 N,the bearing will slip from 20 000 to 70 000 r/min;when the radial load is increased to 2 000 N,the bearing will not slip from 20 000 to 70 000 r/min;with the increase of rotational speed,the centrifugal force on the bearings increases,the contact load between ball and outer ring increases,and the contact load between ball and inner ring decreases,resulting in increased slippage of the bearings at high speed;with the increase of bearing torque load or axial preload,the deflection angle increases;in the presence of angular deflection,with the increase of axial preload,the force on ball increases,the force on ball closer to radial load line is more obvious,the Hirano slip coefficient of ball increases,and the bearings are less likely to slip.
rolling bearingangular contact ball bearingradial loadaxial loadcontact forceHertz contact
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