Industrial shaft seals

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Friction
The lip of a radial shaft seal must always exert
a certain pressure on the counterface if
efficient sealing is to be obtained. The friction
resulting from this lip pressure is only part of
the total friction in the contact and thus of the
total power loss at the sealing position. The
other contributing factors include
N the type of medium being sealed,
N the pressure differential across the seal,
N the circumferential speed,
N the surrounding temperature,
N the lubrication and
N the condition of the counterface.
Diagram 9 gives an indication of the frictional
losses which may be expected when a radial
shaft seal with conventional sealing lip is
properly installed and fully lubricated.
During the running-in phase for the sealing
lip, which lasts a few hours, the frictional
losses are somewhat higher.
For the seals intended for high pressure
differentials, the losses are generally higher
than shown in the diagram. For Waveseal
designs, on the other hand, the losses are
generally lower than indicated.
Frictional loss, W
600
Rotational speed, r/min
5000 4000 3000
500
400
2000
300
200
1000
100
500
0
10 20 40 60 80 100 120 140
Shaft diameter, mm
Diagram 9. Frictional losses of radial shaft seals as a function of rotational speed and shaft diameter
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