are available with a flat (plane) shaft washer (fig. 11) or with tapered raceways on both the shaft and housing washers (fig. 12)
variants with a flat shaft washer (fig. 11):
can compensate minor eccentricity of the shaft relative to the housing bore - for example, to the extent of the internal clearance of the radial bearing (fig. 10)
have a spacer sleeve between the two housing washers, which is designed so that the cover screws of the chock can be fully tightened and no springs are required
variants with tapered raceways on both washers (fig. 12):
generally have a higher axial load carrying capacity compared with bearings with a flat shaft washer
can radially locate the shaft, to a certain extent
are available with a shaft washer that has one or two locating slots to prevent the shaft washer from rotating on its seat, because the bearings are usually mounted with a loose fit on the roll neck as well as in the chock
If the load carrying capacity of double direction tapered roller thrust bearings is insufficient, a double row tapered roller bearing with a steep contact angle, for example in the TDIS design, could be an alternative.
are used almost exclusively in rolling mill screw-down applications
are a special design (fig. 13) of single direction tapered roller thrust bearings
are tailored to customer requirements
have a full complement of rollers with extremely long rollers of large diameter
can accommodate extremely heavy axial loads
are held together by special retaining components
have washers with threaded holes for eye bolts to simplify handling
can compensate angular movement of the screw spindle relative to its support
can accommodate alignment movements of the chock without detrimental effect on bearing performance by using either a spherical shaft washer (fig. 14) or a spherical housing washer (fig. 15)
spherical shaft washer:
alignment movements are accommodated above the roller complement between the spherical shaft washer and a corresponding concave screw spindle or pressure plate (fig. 16)
spherical housing washer:
alignment movements are accommodated below the roller complement between the housing washer and a pressure plate
SKF tapered roller thrust bearings that do not have a full complement of rollers are fitted with one (for single direction bearings) or two (for double direction bearings) of the following cages: