Introduction
A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts.
The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.
Most bearings facilitate the desired motion by minimizing friction. Bearings are classified broadly according to the type of operation, the motions allowed, or to the directions of the loads (forces) applied to the parts. There are some types of bearing below：
- Ball Bearings
- Roller Bearings
- Thrust Bearings
- Bushings Bearings
- Spherical Plain Bearings
- Rod Ends
- Linear Bushing Bearings
- Pillow Blocks, Flanges, Take Up Units and Bearing Inserts
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