Page 561 - SKF-bearing-housings

Standard housing design

Standard housing design Housing material
PD two-bearing housings and their covers are
PD two-bearing housings are non-split hous- made of grey cast iron.
ings with two bearing seats († fig. 1). They
consist of a housing body and two covers that Paint, corrosion protection
are bolted to the body with either four or six PD housings are painted blue (RAL 5007)
bolts. The housings have four holes drilled into using a solvent based alkyd paint. The paint
the feet for attachment bolts. protects the housing in accordance with
PD housings are available in three series, ISO 12944-2, corrosivity category C2 (i.e.
each similar in their external design, but exterior atmospheres with low levels of pollu-
accommodating different bearing tion, interior atmospheres where condensa-
arrangements: tion may occur). The paint is not affected by
most lubricating or engine oils, cutting fluids
• PDN series, for normal radial and axial loads or alkalescent washing chemicals. Housings
• PDP series, for predominant or alternating can be repainted with most water or solvent
axial loads based 1- or 2-component paints.
• PDR series, for heavy radial and normal Unpainted surfaces are protected with a
axial loads solventless rust inhibitor.

Features and benefits Dimension standards
PD housings have the following features and The dimensions of PD two-bearing housings
benefits: are not standardized either nationally or
internationally.
Compact design
The bearings are incorporated in one housing,
which saves space.
Smooth running
The two bearing seats are concentric. Since
bearing misalignment is avoided, rigid bearings
can be used. The resulting stiff arrangement
provides a high degree of running accuracy
and enables high speeds.
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Quiet operation
The accurate alignment of the rigid bearings in
one housing enables quiet operation. For units
with the designation PDNB, a wave spring
washer in the smaller housing range further
reduces noise levels.
Available as units
PD housings can also be supplied as units,
complete with bearings and shaft. These
ready-to-mount units are assembled and
greased at the factory, saving time and reduc-
ing the risk of contaminating or damaging the
bearings during assembly.

Easy handling
Large housings have two eye bolts for safe and
easy handling.

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