Editing Rolling-element bearing (section)

====Cylindrical roller====
[[File:Cylindrical-roller-bearing din5412-t1 type-n ex.png|thumb|left|100px|A cylindrical roller bearing]]

Roller bearings are the [[Bearing (mechanical)#History|earliest known]] type of rolling-element-bearing, dating back to at least 40 BC. Common roller bearings use cylinders of slightly greater length than diameter. Roller bearings typically have a higher radial load capacity than ball bearings, but a lower capacity and higher friction under axial loads. If the inner and outer races are misaligned, the bearing capacity often drops quickly compared to either a ball bearing or a spherical roller bearing.

As in all radial bearings, the outer load is continuously re-distributed among the rollers. Often fewer than half of the total number of rollers carry a significant portion of the load. The animation on the right shows how a static radial load is supported by the bearing rollers as the inner ring rotates.

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