Industrial shaft seals

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Shaft requirements, large diameter seals (LDS)
General
To achieve reliable sealing and sufficiently long
service life, the counterface for large size radial
shaft seals on the shaft should meet the requirements
outlined in the following. The
counterface is considered to be the extent of
the surface of a shaft, or sleeve mounted on a
shaft, over which the edge of the sealing lip
can run, taking into account all permissible
deviations and movements – surface SL,
(Table 11), as well as an additional surface SL’
which may be required in the case of repairs or
inspection.
Tolerances
The diameter of the shaft d 1 at the
counterface should be machined to the
tolerances given in Table 12 and Table 13,
page 78.
If components, which are to be mounted
with an interference fit, are to be passed over
the counterface the shaft diameter should be
reduced by 0,2 mm. The seal which was
originally chosen can still be used without its
sealing properties being impaired.
Table 11.
SL
e 2
e 1
Seal width Counterface 1)
b e 1 e 2 e 3 e 4
from incl. min min
mm
mm
7 7,938 3,5 6,1 1,5 7,6
– 8 3,5 6,8 1,5 8,3
9,525 10 4,5 8,5 2 10,5
11,112 12 5 10 2 12
– 12,7 5 11 2 13
14,288 15 6 12 3 15
20 – 9 16,5 3 19,5
1) SL'~ washer width
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