Rolling-element bearing
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In mechanical engineering, a rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements between two concentric, grooved rings called races. The relative motion of the races causes the rolling elements to roll with very little rolling resistance and with little sliding.
Study of ball bearing by Leonardo da Vinci (1452–1519)
A gear bearing
A needle roller bearing
A prematurely failed rear bearing cone from a mountain bicycle, caused by a combination of pitting due to wet conditions, improper lubrication, improper pre-load adjustment, and fatigue from frequent shock loading.
Thrust bearing
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A thrust bearing is a particular type of rotary bearing. Like other bearings they permanently rotate between parts, but they are designed to support a predominantly axial load.
Miba fluid film thrust bearing