Thrust ball bearings
SKF thrust ball bearings are manufactured as single direction or double direction thrust ball bearings. They are designed to accommodate axial loads only and must not be subjected to any radial load.
SKF thrust ball bearings are separable, i.e. the shaft washer, housing washer(s), ball and cage assembly(s) can be mounted separately.
Shaft washers have a ground bore to enable an interference fit. The bore of the housing washer is turned and always larger than the shaft washer bore.
Single direction thrust ball bearingsSKF single direction thrust ball bearings consist of a shaft washer, a housing washer and a ball and cage assembly (fig. 1). As their name implies, single direction thrust ball bearings can accommodate axial loads and locate a shaft axially, in one direction only.
Double direction thrust ball bearingsSKF double direction thrust ball bearings consist of one shaft washer, two housing washers and two ball and cage assemblies (fig. 2). The housing washers and ball and cage assemblies of double direction bearings are identical to those used in single direction bearings. Double direction thrust ball bearings can accommodate axial loads and locate a shaft axially, in both directions.
CagesDepending on their series and size, SKF thrust ball bearings are fitted with one of the cages shown in table 1.
The lubricants generally used for rolling bearings do not have a detrimental effect on cage properties. For additional information about the suitability of cages, refer to Cages and Cage materials.
Bearings with sphered housing washersTo accommodate initial misalignment between the shaft and housing, SKF supplies both single and double direction thrust ball bearings with sphered seat surfaces on the housing washers (fig. 3). They can be used together with a sphered seat washer adjacent to the housing washer (fig. 4 and fig. 5) or adjacent to a machine component manufactured with a sphered surface.
Appropriate sphered seat washers must be ordered separately (→ product tables). Depending on the bearing series, they have the basic designation U 2, U 3 or U 4 followed by a two-digit number, which identifies the size (e.g. sphered seat washer U 320 for bearing 53320).