The Different Types Of Bearing Seals

Like contact seals, non-contact seals typically Buna-N and nitrile rubber parts bonded to a steel insert. The main difference between the two is that non-contact seals are fixed to the outer ring and do not apply pressure to the inner ring of your bearing.

While non-contact bearings do not touch the inner ring, they do feature a thin lip that rests adjacent to it. This design provides protection against contaminants and leakage, but not to the same degree as a contact seal. However, the lack of contact with the inner bearing produces less friction, which can prevent overheating and other potential issues.

A labyrinth seal is a type of bearing isolator that combines elements of contact and non-contact seals in a single component. The idea of a labyrinth seal is to prevent leakage and contamination by creating a difficult path for both substances to follow. Labyrinth seals are composed of multiple pieces – one that remains stationary and another the rotates with the system. The two pieces interlock and create a thin, grooved path that is long and difficult for substances to escape or penetrate the bearing.

The complexity of a labyrinth seal allows it to provide excellent sealing capabilities. In addition, it can fend off contaminants and prevent leakage without contact the inner ring. As such, labyrinth seals offer the sealing capabilities of a contact seal while limiting added friction like a non-contact seal.

While labyrinth seals offer the best of both contact and non-contact seals, there are some potential downsides. The first is that the complexity of the design may require more physical space than other seals, which can be difficult to manage depending on your application. The second is that this same complexity can cause labyrinth seals to be more expensive than other sealing options. As such you’ll need to weigh the added benefits of these parts to determine if they make long-term sense for your situation.