Roller Bearings

Roller bearings are constructed almost the same way as ball bearings, but they have cylindrical shaped bearings instead of spherical shaped bearings. This gives them a greater load bearing area. They are used in wheel bearing applications. They consist of: 1. an inner "race" which is a hardened ring that is slightly tapered on the outside and 2. an outer race, a hardened ring that is slightly tapered on the inside and 3. a set of rollers contained in a cage. These bearings must not be crushed together, (the angle of assembly drives them together) creating friction if they are tightened too far. Roller bearings need to be repacked periodically with fresh grease to insure a long life.