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Designs and variants

Spherical roller bearings
Spherical roller bearings have two rows of rollers, a common sphered outer ring raceway and two inner ring raceways inclined at an angle to the bearing axis. The centre point of the sphere in the outer ring raceway is at the bearing axis. Therefore, the bearings are self-aligning and insensitive to misalignment of the shaft relative to the housing, which can be caused, for example, by shaft deflection. Spherical roller bearings are designed to accommodate heavy radial loads, as well as heavy axial loads in both directions.
Factors that influence SKF spherical roller bearing performance

Bearing performance is not only determined by load or speed ratings. There are a number of other factors that contribute to bearing performance. To a large extent, performance is influenced by the geometry of the rollers, raceways and cages, the heat treatment, as well as the surface finish of all contact surfaces.

Main factors which influence SKF spherical roller bearing performance include, but are not limited to:
Symmetrical rollers
Symmetrical rollers self-adjust, providing optimal load distribution along the roller length. This keeps stresses low under all load conditions and extends bearing service life.
Roller tolerances
The rollers in an SKF spherical roller bearing are manufactured to extremely tight tolerances for dimension and form. Each roller is virtually identical in size and shape to the other rollers in the set. This optimizes load distribution over the rollers to maximize bearing service life.
Special roller profile
The roller profile determines the stress distribution in the roller/raceway contact area. The special profile distributes loads more evenly along the rollers and prevents stress peaks at the roller ends to extend bearing service life.Self-guiding rollers and a floating guide ring between the two rows of rollers

Self-guiding rollers reduce friction and frictional heat. A floating guide ring guides unloaded rollers so that they enter the load zone in the optimal position.
Assortment

The assortment of SKF spherical roller bearings is the widest on the market and includes standard bearings and application specific bearings. Almost all SKF spherical roller bearings are available with either a cylindrical or tapered bore. The assortment of standard bearings includes:
- open bearings
- sealed bearings
- bearings for vibratory applications
- SKF Energy Efficient (E2) bearings

The SKF spherical roller bearings assortment on-line constitutes the basic SKF assortment and is only part of the total assortment. For applications where the bearings are subjected to unique operating conditions, SKF can customize bearings to meet the needs of that particular application. For example, bearings for:
- printing presses, paper mills or coaters in high precision execution
- very arduous operating conditions, e. g. continuous casters
- high temperature applications
- railway vehicles

For additional information about application specific spherical roller bearings, contact the SKF application engineering service.