What types of seals and dust-proof devices are there for Deep Groove Ball Bearing?

There are mainly the following types of seals and dust-proof devices for Deep Groove Ball Bearing:
Open (no cover):
This type of deep groove ball bearing does not have any sealing structure and is completely exposed to the external environment.
Metal shield with dust cover (ZZ):
The dust cover stamped by steel plate is used on both sides of the bearing to simply and effectively prevent dust from entering the bearing raceway.
However, this type of dust cover mainly focuses on the dust-proof function and has poor waterproof performance.
Rubber seal ring:
Non-contact rubber seal ring (VV type):
It has small friction torque, good high speed performance, good dust-proof performance, but poor waterproof performance.
Contact rubber seal ring (DDU type):
In addition to the characteristics of small friction torque, good high speed performance and good dust-proof performance, it also has good waterproof performance.
This type of seal ring is a contact oil seal, which can effectively prevent the grease in the bearing from overflowing.
Other types:
It also includes bearings with retaining rings on the outer diameter of the outer ring. These retaining rings can play a positioning role during installation to prevent the bearing from moving on the shaft.
Model indication:
In the bearing model, the type of dust cover or seal ring is usually specifically indicated. For example, ZZ indicates steel plate dust covers on both sides, DDU indicates contact rubber seal rings on both sides, and VV indicates non-contact rubber seal rings on both sides.
Usage scenarios:
Different types of seals and dustproof devices can be selected according to different usage environments and needs. For example, in dusty environments, bearings with dust covers can be selected; in situations where waterproofing or dustproofing is required, bearings with rubber seal rings can be selected.
In summary, Deep Groove Ball Bearing has various types of seals and dustproof devices, and users can choose the appropriate type according to the specific usage environment and needs.