Sealed bearing意思

"Sealed bearing" is a term used in the context of bearings, which are mechanical devices used to reduce friction between moving parts in various types of machinery and equipment. A sealed bearing is a type of bearing that has been designed to prevent the ingress of dirt, dust, or other contaminants into the bearing assembly.

Sealed bearings are typically used in applications where the bearing is exposed to the environment or where contamination is a concern. They are often used in automotive applications, such as in the wheels of a car, as well as in household appliances, industrial machinery, and many other types of equipment.

The sealing mechanism can take many forms, including rubber or plastic seals, shields, or metal contact seals. The type of seal used can vary depending on the specific application and the environment in which the bearing will be operating. Some sealed bearings are also designed to be maintenance-free, meaning they do not require the addition of lubricant during their lifetime.