Designs and variants

fig. 4

fig. 5

fig. 6

fig. 7

fig. 8

fig. 9

• are available as symmetrical (fig. 4) or asymmetrical (fig. 5) variants with regard to the shaft and housing washers
  • symmetrical variants (fig. 4):
    • have shaft and housing washers in the same design with tapered raceways and one guide flange
    • are preferred where very heavy axial loads are to be supported, for example in the swivels or top drives of drilling rigs or in crane hooks
  • asymmetrical variants (fig. 5):
    • have a shaft washer with tapered raceway and guide flange, whilst the housing washer has a flat (plane) raceway
    • carry higher axial loads than same-sized symmetrical variants, because longer rollers can be incorporated
      
    • can compensate minor eccentricity of the shaft relative to the housing bore
    • are fitted with a roller centred cage
• are available in several variants, for example with a different housing washer and cover (fig. 6)

• are used almost exclusively for the kingpin bearing arrangement of commercial vehicles (fig. 7)
• are available with a full complement of rollers and are held together by a sheet steel cover (fig. 8)
• are available with wear- and oil-resistant NBR seals (fig. 9) and lubricated for life with a multi-purpose grease

Large single direction tapered roller thrust bearings (→ product table)

• are used mainly for top drive systems in the oil and gas industry
• are designed to boost top drive reliability with long service life and high load carrying capacity
  
• are SKF Explorer bearings

• are mainly used together with double row cylindrical roller bearings or four-row cylindrical roller bearings in rolling mill applications (fig. 10)
• 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.

fig. 10

fig. 11

fig. 12

• 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 also supplies the suitable pressure plates

fig. 13

fig. 14

fig. 15

fig. 16

• machined brass cage (fig. 17)
• steel pin-type cage (pierced rollers, fig. 18)
• pressed steel window-type cage (fig. 19)

fig. 17

fig. 18

fig. 19