Spherical Roller Bearings SKF 22228 CCK/C4W33

The designation C4 denotes a significantly increased radial bearing clearance above the C3 range. This design is required when play is reduced during operation due to tight press fits on the shaft or large temperature differences between the inner and outer rings. It prevents the roller set from becoming distorted under demanding thermal or mechanical operating conditions.

The abbreviation W33 in the variant description refers to a circumferential lubrication groove with lubrication holes in the outer ring. This design directs grease or lubricating oil directly and evenly between the two rows of rollers. This facilitates regular relubrication in open bearings and effectively flushes spent lubricant out of the working area.

This roller bearing is manufactured to standard tolerance (PN), whilst its running accuracy corresponds to the higher P5 class. This combination provides easy-to-fit dimensions for the inner and outer rings, whilst ensuring enhanced concentricity during operation. This counteracts vibrations and promotes smooth rolling behaviour during high-speed rotational movements.

The bearing is designed for operating temperatures ranging from -30 to +200 degrees. The material, made from through-hardened standard roller bearing steel (100Cr6), and the integrated sheet steel cage retain their dimensional stability across this wide range. At higher operating temperatures, however, a lubricant must be selected that can withstand the thermal stress.

Bearings with a tapered bore (1:12 taper) are either fitted directly onto a suitable tapered shaft journal or secured onto a cylindrical shaft using clamping or withdrawal sleeves. When pushed on axially, the inner ring expands. The resulting fit is usually checked using a feeler gauge to measure the remaining radial bearing clearance.