Page 498 - SKF-bearing-housings

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

End plates to secure a bearing on a cylin- Fig. 8
drical seat at the end of a shaft († fig. 8) are
not supplied by SKF. Suitable dimensions for
end plates are provided in the product tables.
SBD and THD housing bodies are supplied
with different covers to fit the following shaft
arrangements:
• housing for a shaft end, designation suffix A
• housing for a through shaft, designation
suffix B
• housing for a locating bearing, designation
suffix F End plate
• housing for a non-locating bearing,
designation suffix L
When ordering, the suffixes should be com-
bined; see the order example on page 501.
End cover
Locating and non-locating bearing
positions
SBD plummer block housings and THD take-
up housings can be used for both the locating
and non-locating bearing positions. The hous- Breaking loads and safety factors
ing covers determine the width of the bearing Guideline values for the breaking loads of
seat. For a locating bearing, the covers provide housings made of spheroidal graphite cast iron
a bearing seat that is the same width as the are provided in table 3 on page 496. To obtain
bearing (designation suffix F). For the non- the permissible load for a housing, the appro-
locating bearing, the covers provide a bearing priate breaking load value should be divided by
seat that is wider than the bearing (designa- a factor selected based on the safety require-
tion suffix L). The permissible axial displace- ments. In general engineering, a safety factor
ment of the bearing is listed in the product of 6 is typical († Load carrying capacity,
tables (parameter “s”). page 44).
For SBD housings made of cast steel, the
values obtained from table 3 on page 496
Load carrying capacity should be multiplied by a factor of 1,25. For
SBD plummer block housings and THD take- housings made of grey cast iron, the values
up housings are designed to accommodate should be multiplied by a factor of 0,63.
radial loads acting in all directions as well as The load P a is the axial breaking load of the
axial loads acting in both directions on the housing. If the incorporated bearing is mounted
locating bearing position. on a sleeve, the permissible axial load for the
For SBD housings, the permissible radial sleeve must be checked.
loads depend on the bearing, the housing and
the attachment bolts. Loads acting perpen- Additional housing support for SBD plummer
dicularly to the support surface are limited block housings
only by the bearing. SBD housings must be When the housing is subjected to loads acting
supported over the entire base area. parallel to the support surface, it may be nec-
For information on the load carrying essary to provide a stop to counter the load.
capacity of THD take-up housings, contact When loads act at angles between 55° and
SKF application engineering service. 120°, or when the axial loads are greater than
5% of P 180° († table 3 on page 496), a stop
should be provided to counter the load. The

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