Page 494 - SKF-bearing-housings

Non-split plummer block housings and take-up housings SBD and THD series

Housing variants number of stages in the labyrinth ring varies
with housing size.
The following housing variants can be supplied In THD take-up housings, the labyrinth
on request: rings are locked on the shaft with adapter
rings. In SBD plummer block housings, the
• SBD or THD housings for CARB toroidal labyrinth rings are locked in different ways
roller bearings depending on the housing type:
• SBD housings for bearings on a withdrawal
sleeve • fixed with an adapter ring († fig. 5a)
• Housings with taconite heavy-duty seals • clamped between the bearing and a shaft
• Housings made of cast steel (series desig- shoulder(† fig. 5b)
nation SBDS or THDS) • clamped between the bearing or the lock nut
• Housings made of grey cast iron (series and another component on the shaft
designation SBDC or THDC) († fig. 5c)

For additional information about these vari- The product tables show how the labyrinth
ants, contact the SKF application engineering rings are locked for the different housing
service. designs. Adapter rings are supplied with the
housing when needed. The adapter ring is
identified by the prefix PSBD followed by the
Sealing solutions size (shaft diameter) in millimeters uncoded,
e.g. PSBD 170. Adapter rings are listed in
SBD plummer (pillow) block housings and THD table 1.
take-up housings are supplied with labyrinth In typical applications, the bearing and
seals as standard. They can also be used with housing are completely filled with grease.
sealed spherical roller bearings, and variants Excess grease enters the labyrinths and
are available for taconite heavy-duty seals. improves the sealing effect. Most THD take-
up housings and SBD plummer block housings
have ducts to supply grease directly to the
Standard seals seals.
The labyrinth seal consists of a labyrinth ring Seal characteristics are listed in table 2.
made of grey cast iron, mounted on the shaft,
which forms a multi-stage axial labyrinth with
the seal grooves in the housing cover. The

Fig. 5

a b c

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