Do you know bearing cover type and use?

Shield or Metal bearing cover

Shields and metal seals are vital components used in bearings to provide a physical barrier against contaminants and retain lubrication within the bearing assembly. These seals are commonly constructed from metal materials and are designed to protect bearings from various external elements, ensuring optimal performance and longevity. 

Bearing cover Design 

Shields (ZZ) bearing cover: Shields, often denoted as ZZ in bearing designations, are typically metal plates that do not make direct contact with the inner bearing ring. They act as non-contact seals and are designed to provide a physical barrier against larger particles, such as dirt, dust, and debris. The space between the shield and the inner ring allows for some ventilation but may not prevent finer contaminants from entering. 

Seals (2RS)bearing cover: Metal seals, indicated as 2RS in bearings, involve a more direct contact with the inner bearing ring. These seals are designed to create a tighter barrier against contaminants compared to shields. They often utilize a rubber or synthetic material coating to enhance the seal's effectiveness by reducing the gap between the seal and the inner ring, providing better protection against both larger and finer particles. 

Bearing end cover:

Mainly used to seal the end of the bearing, preventing dust and impurities from entering the interior of the bearing, playing a sealing and protective role.

Generally installed on the outer side of the bearing seat or casing, directly in contact with the outer ring or bearing seat of the bearing.

Commonly found in equipment such as motors and gearboxes, it can reduce lubricant loss and extend the service life of bearings.

Typical materials: cast iron, aluminum alloy, or engineering plastic