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Spherical roller bearings consist of an outer ring having a continuous spherical raceway and two rows of barrel-shaped rollers guided by an inner ring with two raceways.
This bearing has self-aligning properties, and therefore is suited for use where misalignment between the inner and outer rings occurs from housing installation error or shaft bending.
Spherical roller bearings have a large capacity for radial loads, axial loads in either direction, and combined loads.
They are also suited for applications where vibration and shock loads are encountered.
When spherical roller bearings are used with a vertical shaft or under a large axial load, the load on the rollers of the row that is not subject to the axial load becomes small, and the resulting skidding on the rollers may result in wear.
ISO class spherical roller bearings are available with straight bore and tapered bore ("K" suffix) inner races for various shaft mount applications.
The standard taper ratio is 1:12 for bearings with a K suffix; for bearings in series 240 and 241, the suffix K30 indicates the taper ratio of 1:30.
Most tapered bore bearings incorporate the use of adapters and withdrawal sleeves for shaft mounting.