SN Plummer Block Housings
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SN plummer block housings are used for light spherical roller bearings. They have a compact desig. Plummer block housings in SN series are used with the tapered bores with adapter sleeves and cylindrical bore
with stepped shafts. This type of housing is horizontally split. It has
dowel pins or straight pins that help avoid incorrect assembly.
The housing allows some amount of axial displacement. Locating bearing
arrangement can be obtained by inserting locating rings between outer ring
and the housing. This needs to be considered when dimensioning the shaft
shoulder. They have elongated holes for attachment bolts.
SN plummer block housings need felt seals. Before inserting the seals, they
should be soaked in hot oil for some time. They are rubbing seals and can be
used for peripheral speeds. For harsh conditions or where there is presence
of water, V rings need to be used with the felt seals on the machined side
faces. This limits the axial displacement.
End covers are used to close the housings at the shaft ends. It is inserted
in the seal groove. Grease lubrication is preferred for SN plummer block
housings. They are made of gray cast iron. These housings are designed to
carry loads that act at right angle to the surface.
