What is the difference between covered bearings and bearings without covers

What is the difference between covered bearings and bearings without covers

The main difference between covered bearings and uncovered bearings (open type bearings) lies in their dust prevention and sealing performance:

Dust cover: Covered bearings usually refer to bearings with dust covers, which can prevent dust and other external impurities from entering the interior of the 

bearing, thereby extending the service life of the bearing. Dust covers are divided into two types: metal dust covers and non-metal dust covers

.

Sealing ring: Covered bearings may be equipped with rubber sealing rings to provide better sealing effect, prevent grease leakage, and prevent external moisture 

and dust from entering. Sealed ring bearings are usually divided into contact type and non-contact type. Contact type seals contact the inner ring, while non-c

ontact type seals do not contact the inner ring, each with its own advantages and disadvantages

.

Maintenance: Open type bearings may require more frequent maintenance and lubrication as they lack sealing devices, grease is prone to loss, and dust and 

impurities may also enter.

Application environment: Covered bearings are suitable for harsh environments such as dusty or humid places. And uncovered bearings are suitable for 

relatively clean and dry environments, or for situations where costs are strictly controlled and maintenance is convenient.

Friction and temperature rise: Covered bearings may have slightly higher friction torque and temperature rise due to the presence of seals, especially contact 

seal ring bearings

.

Speed capability: Cappeless bearings typically have higher speed capability due to their low friction, making them suitable for high-speed operation.

Cost: Covered bearings usually have higher costs than uncovered bearings due to the addition of sealing devices.

When choosing bearings, it is necessary to determine whether covered bearings are needed based on the specific application environment and performance 

requirements.