INTRODUCTION TO OIL SEALS AND HOW THEY ARE USED

Oil seals have a flexible lip that actually rubs against the rotating shaft or housing to prevent leakage. The spring keeps the lip in contact with the shaft. Bearing isolator oil seals are dynamic seals that incorporate a rotor or rotating member and a stator or stationary member. The rotor actually turns with the shaft. Some oil shafts are bearing isolators with a labyrinth construction. Others incorporate simpler O-rings.
The oil seal is our first line of defense in regards to keeping lubrication inside the reducer. It might also be described as the last line of defense – keeping contaminants outside the reducer where they belong. The average seal is incredibly simple in design – made up of a case, a lip or lips, and frequently a garter spring. Of course, some are exponentially more intricate and are manufactured with unusual materials, but the majority are straightforward.

In order to use the oil seal reasonably, the following points should be paid attention to:
Figure 14.3. Oil aging of fluoroelastomers.5 Chart shows percent retained elongation. Conditions: Aged at 150°C in Service Fluid 105 (oil changed every 168 h).
Rotary Wheel Of Auto Parts