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A roller bearing is a type of rolling-element bearing that uses a cylinder (roller) instead of a ball to maintain separation between the bearing races. The fundamental function of a roller bearing is to support a rotating shaft while allowing smooth motion under load. Roller bearings typically consist of two concentric rings (inner and outer raceways) with a set of rollers between them. The rollers are guided by a cage or separator that keeps them evenly spaced and prevents roller-to-roller contact.
These bearings use rollers that are longer than their diameter and offer exceptional radial load capacity. They are commonly used in high-speed applications like electric motors, gearboxes, pumps, and machine tool spindles. Cylindrical roller bearings can support heavy radial loads but typically offer limited axial load capacity unless modified.
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