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What are the compounds of a bearing?
The bearing exist out of multiply parts :
The Inner Race is the smaller of the two bearing rings. It has a groove on its outer diameter to form a raceway for the balls. The surface of the outside diameter path is finished to extremely tight tolerances and is honed to be a very smooth surface.
The Outer Rice is the larger of the two bearing rings. On the outer ring, there is a groove on its inside diameter to form a pathway for the balls. It also has the same high-precision finish as the inner ring.
The balls separate the inner ring and outer ring and permit the bearing to rotate with minimal friction. The dimension of the rolling elements is made slightly smaller than the track on the inner and outer rings. Rolling element are very important for different results. Surface finish, size variations and material are important attributes. These attributes can make a lot of different for how good a bearing is. The amount of balls can also variant. Fewer balls are less friction, what can make it faster. But fewer balls also means that it's less strong and might fall apart with too much pressure on it.
The retainer in bearings is to separate the rolling elements, maintain a constant spacing between the inner and outer rings, accurately guide the rolling elements in the path during rotation, and to prevent the rolling elements from falling out.
The shield is pressed into a very small groove on the inside edge diameter of the outer ring. A small space or gap remains open between the outside diameter of the inner ring and shield. Because the shield does not contact the inner ring of the bearing, there is no added friction between the shield and bearing. This results in a bearing that has very low torque. The purpose of shields is to keep larger particles of contamination from entering the bearing.