Industrial shaft seals

gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21,
Industrial
факс
shaft seals
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Sealing lip design
The form and design of the sealing lips are
based on knowledge gained through research
and development activities as well as very wide
practical experience obtained by SKF in close
cooperation with users. The distance between
the lip and the seal back face, the strength of
the flex section, the angle of the lip (fig 37,
page 54) and the tension in the spring are
chosen so that the pressure distribution in the
sealing lip/counter surface contact required for
satisfactory sealing can be established.
The sealing lips of SKF radial shaft seals are
produced in several materials and two different
designs. The various materials are described
on page 27. The two designs differ in the
execution of the seal lip edge. The “conventional”
sealing lip (fig 40), has a straight edge
whereas the edge of the SKF Waveseal design
(fig 41), has a special hydrodynamic form so
that the lip describes a sinusoidal path on its
counter surface.
The Waveseal design from SKF represents one
of the most important developments in radial
shaft seals. The sealing lip is pressed and its
special form produces a relative movement of
the sealing lip on the counterface, imparting
hydrodynamic properties. Waveseals are
suitable for both directions of rotation; they
pump the lubricant back into the bearing
arrangement and expel contaminants. The
sinusoidal form of the sealing lip considerably
extends the path (fig 41) on the counter
surface and at the same time reduces the
specific surface pressure in the sealing
lip/counter surface contact.
oil side air side
Fig 40. Conventional sealing lip with straight edge
oil side air side
Fig 41. SKF Waveseal lip with sinusoidal edge
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 59 22