Page 562 - SKF-bearing-housings

Two-bearing housings PD series

Housing variants Fig. 2

In addition to standard design PD housings,
the following variants are available on
request:
• housings for oil bath or circulating oil
lubrication systems
• housings for vertical shaft arrangements

For additional information, contact the SKF
application engineering service.

Sealing solutions

PD two-bearing housings are designed for two
sealing solutions:
Fig. 3
• a V-ring seal, for housings in the PDN 2 and
PDP series († fig. 2)
• a felt strip and a V-ring seal, for housings in
the PDN 3 and PDR series († fig. 3)

Table 1, provides an overview of the proper-
ties and suitability of each sealing solution.
This information should be used as a guideline,
which cannot substitute for testing the seal in
its application.
Housings in the PDN 3 and PDR series have
felt strips, which are mounted in a groove in
the cover. At circumferential speeds above
4 m/s, a small gap forms between the felt and
the seal counterface.
The outboard V-ring seals (for all housing
series) provide additional protection against
contaminants. They can accommodate cir-
cumferential speeds up to 7 m/s.
PD housings are supplied with seals but the
seals can also be ordered separately.

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