The inner and outer ring raceways are segments of cones and the rollers are also made with a taper so that the conical surfaces of the raceways and the roller axes if projected, would all meet at a common point on the main axis of the bearing.
This conical geometry is used as it gives a larger contact patch, which permits greater loads to be carried than with spherical (ball) bearings, while the geometry means that the tangential speeds of the surfaces of each of the rollers are the same as their raceways along the whole length of the contact patch and no differential scrubbing occurs. This avoids rapid wear and greatly reduces rolling friction.
American’s Tapered Roller Bearings and manufactured from the cleanest and finest commercially available AISI case hardening bearing steels.
Standard tolerances conform to ABMA Classes 4 and 2, depending on size. Our size range for standard and special tapered roller bearings is 200mm (7.874 in.) Bore size to 1800mm (72 in.) O.D. This catalog shows the most commonly used sizes and types of inch dimensioned Tapered Roller Bearings as follows: