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Tuesday, April 28, 2020




A bearing is a machine element that constrains relative motion to only the desired motion, and reducing friction between moving parts. The design of the bearing may for example , provide a free linear moment for the moving part or for free rotation around a fix axis or it may prevent a motion by controlling the vectors of normal forces that bear on the moving part. 
Most bearings Facilitate the desired motion by minimizing the friction.

Bearings are classified accordingly to the type of operation, the motion allowed or to the direction of the loads (forces) applied to the parts.


1. Plane Bearing :- It consists of a shaft rotating in a hole , there are several specific styles:- 
                                (a) Journal Bearings
                                (b) composite Bearing

2. Rolling Element Bearing :- In which the rolling elements are placed between turning and                                                                 stationary races prevent sliding friction. it having two types:-
                                (a) Ball Bearing:- In which the rolling elements are spherical balls.
                                (b) Roller Bearing:- In which the rolling elements are Cylindrical rollers.

3. Fluid Bearings :- A non-contact Bearing in which the load is supported by a Gas or a Fluid.

4. Magnetic Bearings :- In which the load is supported by the Magnetic field.

5. Flexure  Bearings :- In which the motion is supported by a load elements which bends.

6. Jewel Bearings :- A  plane bearing in which one of the bearing surfaces is made of an ultra-hard                                      glassy jewel material such as Sapphire to reduce friction & Wear.

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