Industrial shaft seals

gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21,
Industrial
факс
shaft seals
(495) 22
V-ring seals
General
The V-ring is a unique all-rubber seal for
rotary shafts. Developed in the 1960's, it has
been used successfully by OEM and the
replacement market worldwide in an extremely
wide range of applications.
The V-ring is used alone to seal out the
ingress of dirt, dust, water or combination of
the above media while positively retaining
grease. With its unique design and performance
the V-ring protects a wide range of
bearing types. It is often used as a secondary
seal to protect primary seals that do not
perform well in hostile environments.
V-ring seals are mounted on shafts and their
thin, tapered lip seals against a surface
(counterface) at right angles to the shaft
(fig 86a). No special demands are placed on
the surface finish of the shaft seating and the
V-rings act as flingers (fig 86b), since they
have an interference fit on the shaft and rotate
with it. Misalignment of the shaft with respect
to the counterface (fig 86c) can be tolerated
and V-rings also provide reliable sealing if the
shaft is out-of-round or rotates eccentrically
(fig 86d). It should be remembered when
using V-rings that the amount by which the
shaft can be displaced axially is governed by
the permissible displacement of the V-ring
relative to its counterface.
V-rings are made entirely of elastomer
without fabric or sheet metal reinforcement.
They are, therefore, particularly easy to install.
They can be stretched and, depending on
size, can be pushed over other components of
the arrangement, e.g. flanges, pulleys or even
housings. This is a very valuable characteristic,
expecially in the case of repairs.
Function
The V-ring has a body (87a) and a flexible
conical shaped sealing lip (87b) with an
integral resiliant “hinge” (87c). It is streched
and mounted directly on the shaft, where it is
held in place by the inherent tension of the
seal body. It rotates with the shaft and seals
axially against a stationary counterface.
The counterface can be the end face of a
bearing, a washer, stamping, bearing housing,
or even the metal case of an oil seal.
In many instances the V-ring can be
stretched and installed over flanges and
bearing housings without costly dismantling.
b
a
c
Fig 86 Fig 87
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс 323 (495) 22