A bearing is a machine element that constrains rel...

hole type axles axial parts balls races shafts source vectors example rollers motions demands journals structure operation fixed axis durability directions Lubrication application moving part reliability performance radial loads ball bearing wide variety plain bearing Most bearings simplest form free rotation normal forces desired motion roller bearing relative motion bearing designs Rotary bearings machine element bearing assembly rolling elements sliding friction maximum efficiency mechanical systems rotating components free linear movement circular cross-section