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How does a Bearing Isolator work?

 

An Inpro/Seal Bearing Isolator is a two part dynamic seal consisting of a stator, press-fitted into the bearing housing, and a rotor, attached to the shaft. The rotor revolves with the shaft, driven by a tightly fitting drive ring that is fixed to the shaft.

The rotor and stator form a non-contacting compound labyrinth seal with no wearing parts, ensuring permanent protection.

Lubricant is captured in the inner portion of the labyrinth and flows back to the bearing housing. Outside contamination attempting to enter the bearing housing is captured in the outer labyrinth paths and expelled through a port in the rotor by centrifugal force and gravity.