SKF - Rolling Bearings

Sealing solutions
SKF supplies all Y-bearings capped with a seal
or shield on both sides. In typical Y-bearing
applications, no additional external protection
is necessary. Therefore, Y-bearings are available
with several sealing arrangement designs
to meet the demands of a wide range of operating
conditions.
Standard seals
The standard seals for Y-bearings (no designation
suffix) consist of a stamped sheet steel
washer with a seal lip made of NBR, vulcanized
to its inner surface († fig. 16). The non-contact
sheet steel washer forms a narrow gap
with the cylindrical surface of the inner ring
shoulder and protects the seal against coarse
contaminants.
Standard seals with additional flingers
For more contaminated environments, SKF
recommends Y-bearings equipped with a
standard seal and an additional plain flinger
on both sides († fig. 17, designation suffix 2F).
The flinger, made of sheet steel or stainless
sheet steel, has an interference fit on the inner
ring to considerably improve the effect iveness
of the seal without increasing friction. These
seals are only available for bearings with an
inner ring extended on both sides.
Multiple seals
For very contaminated environments, SKF
recommends Y-bearings equipped with the
highly effective multiple seal on both sides
(† fig. 18, designation suffix 2RF). This sealing
arrangement consists of a standard seal
and a flinger with a vulcanized NBR lip. The
flinger lip seals axially against the standard
seal. The space between the flinger lip and the
shaft is filled with grease to provide additional
protection. These seals are only available for
bearings with an inner ring extended on both
sides.
Design and variants
Fig. 16
Fig. 17
Fig. 18
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