Dynamic Analysis and Design of Cylindrical Roller Bearings with Arc End Surfaces of Rollers

The new contact model for arc end surfaces of rollers and flanges is established in a dynamic model for cylindrical roller bearings. The dynamic behaviors between roller arc end surfaces and flanges, i.e., contact pressures, sliding velocities, and PV values (peak contact pressure P × sliding velocity V), are investigated and compared to those between roller corners and flanges. Based on the indicators of contact heights and axial clearances, the selection ranges of layback angles, flange axial clearances, and end radius of rollers are proposed, thereby ensuring the bearing operates normally. The results indicate that arc end surfaces are beneficial in reducing contact pressures, sliding velocities, and PV values acting on flanges, especially under high-speed conditions. With less layback angles of flanges and end radii of rollers, contact positions on rollers are more concentrated and the sliding velocity decreases obviously. However, flange heights need to be increased to prevent contact heights between rollers and flanges within the limited zones. Furthermore, since the end radius of rollers leads to a decrease in the axial clearance of flanges, the actual clearance of flanges under axial direction needs to be widened.