A mechanical component designed to support a load while permitting specific relative motion, typically rotation or linear sliding, between two parts. Bearings rely on rolling elements like balls or rollers, or on a fluid film in plain configurations, to minimize frictional wear and heat generation. They are fundamental to machinery design, absorbing radial and thrust loads to keep rotating shafts aligned and running smoothly.
We need to pull the rotor and replace the main thrust bearing before the vibration wrecks the housing.
Premature bearing failure is almost always caused by contamination, improper lubrication, or misalignment, rarely by a manufacturer defect.
Related terms
Ball bearing
A mechanical bearing that reduces rotational friction by capturing spherical rolling elements between two grooved rings.
Journal
The specific cylindrical portion of a shaft rests and rotates within a bearing.
Bushing
A cylindrical sleeve used as a plain bearing to reduce friction and wear inside a hole.
Journal box
A protective housing that encloses a rotating shaft end and its bearing to retain lubricant and block debris.