Non sealedbearing

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Picard concludes that it is critical to consult with a bearing application engineer in selecting the appropriate enclosure for your application to ensure the correct choice.

Shieldedbearingvs sealedbearing

While they can be tricky to remove and replace, with a little elbow grease and know-how, you can repair your worn out wheel bearings.

Sealed bearings

“Seals can be either non-contact or contact by design. With a non-contact seal, similar to a shield, there is no contact to the bearing inner ring. A contact seal is designed to contact the bearing inner ring with the lip of the seal,” he said.

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Sealedbearingvs openbearing

Both non-contact seals and shields allow reduced rotational torque as there is no contact to the inner ring. However, non-contact enclosures generally provide less protection against contamination, as compared to contact seals.

A wheel bearing, at its core, is a compact yet critical component that facilitates the smooth rotation of the wheel hub assembly.

“However, while contact seals provide better protection against contamination there is an increase in rotational torque due to friction between the seal lip and bearing inner ring. Sealing performance is a trade-off between protection and torque,” Picard warns.

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Do shielded bearings need to be greased

“The selection of a shield or seal is dependent on the bearing application and environment,” said Picard. “Shields are metallic and there is no contact between the shield bore and the bearing inner ring. Metallic shields are the most common and affordable type of bearing enclosure.”

Ball bearings are available with and without enclosures. Richard Picard, field applications engineer at NMB Technologies Corporation explains that compared to open bearings, shielded and sealed bearings provide better protection from contamination and also add protection against lubrication migration.

A wheel bearing replacement could cost anywhere between $150 to $800. The cost will vary as per the make and model of your vehicle, part price, and labor ...

Double shieldedbearing

Seals are constructed from various elastomeric materials. The type of seal material selected can depend on factors such as application temperature and compatibility with other adjacent substances.

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Bearing shieldtypes

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The selection of shields is dependent on the application and environment. Depending on the environment, shield/seal designs are offered with varying degrees of contamination resistance and torque (friction) characteristics. The seal lip can be further optimized by selecting either “standard” contact or “light” seal lip design which is dependent on torque and contamination conditions.