Page 89 - Y-bearing-units

Seals
Fig. 14
Since Y-bearings were originally developed for
use in agricultural applications, sealing has
always been very important. Therefore, SKF
Y-bearings are available with different sealing
configurations to suit the operating conditions.
2
Standard seals
The standard seal for SKF Y-bearings is the
rugged integral seal. It consists of a pressed
sheet steel washer with a sealing lip made of
acrylo nitrile-butadiene rubber (NBR) vulcanized
to its inner surface († fig. 14). The non-contact
sheet steel washer forms a narrow gap with the
cylindrical surface of the inner ring shoulder and
protects the land-riding seal against coarse
Fig. 15 contaminants.

Standard seals with an additional flinger
For more contaminated environments, a
Y-bearing with an inner ring extended on both
sides should be used. These bearings are
equipped with seals that have an additional
plain, sheet steel flinger on the outboard side
of the integral standard seal († fig. 15) and
are identified by the designation suffix 2F. The
flingers are made of sheet steel or stainless
sheet steel respectively, have an interference fit
on the inner ring and considerably enhance the
seals’ effectiveness without increasing friction.

Multiple seals
Fig. 16 For Y-bearing arrangements requiring a high
degree of reliability, even in extremely contam-
inated environments, a bearing with an inner
ring extended on both sides should be used with
the highly efficient multiple seal arrangement.
In this sealing arrangement († fig. 16), a
flinger with a vulcanized rubber lip is fitted outside
the standard integral seal. This acrylo nitrile-
butadiene rubber lip seals axially against the
integral seal. The space between the integral
seal and the rubberized flinger is filled with
grease to provide additional protection.

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