Spherical Roller Bearings SKF 22218 E

With this combination, the external dimensions of the bearing comply with PN standard tolerances, which ensures standard interchangeability. The running accuracy, however, is manufactured to tolerance class P5. This means tighter concentricity tolerances for the inner and outer rings, which contributes to improved guidance accuracy and reduced running noise during operation.

The open bearing has a circumferential lubrication groove with holes in the outer ring. Fresh lubricant can be fed directly into the interior space between the rolling elements via this lubrication channel. Depending on the requirements, use suitable industrial oils or roller bearing greases. As no seals are fitted, the surrounding housing must protect the bearing from dirt and moisture.

The spherical roller bearing, made from standard 100Cr6 rolling bearing steel with a sheet steel cage, is designed for temperatures ranging from -30 to +200 degrees. Within this range, the material retains its dimensional stability. When selecting the lubricant, you should ensure that it is approved for the actual operating temperature encountered during use.

The version with standard bearing clearance provides the standard radial clearance between the rollers and raceways when the bearing is unmounted. This clearance compensates for operational heating and the radial expansion of the inner ring during press-fitting onto the shaft, ensuring that the bearing operates with the specified operating clearance during operation.

An open design without integrated sealing washers allows lubrication via centralised lubrication systems and the free flow of circulating oil. Design engineers tend to favour this variant in enclosed gearboxes or housings, where external seals such as shaft seals or labyrinth seals provide the seal against the external environment.