Bearings
Bearings with seals
Protection against dust, dirt & moisture.
Bearings play a crucial role in machinery and equipment. In many applications, bearings are exposed to special conditions suchh as dust, dirt and moisture. This can affect a bearing's performance and lifespan. Fortunately, bearings with seals offer an effective solution to minimize these influences.
Why choose bearings with seals?
Bearings with seals offer several advantages, including:
- Protection against external contaminants such as dust, moisture and dirt.
- Prevention of grease loss, which extends the bearings life
- Maintenance friendliness, as post-lubrication is not necessary
- Longer life, as internal lubrication is maintained
Double-sided seals
There are several type of seals used on bearings. The two most common types are the ZZ seal and the 2RS seal.
Bearings with a ZZ seal
The ZZ seal consists of a thin steel plate and is a non-slip seal. This means that the cover plate does not make direct contact with an inner ring of the bearing. Because of this, there are some advantages:
- No friction, resulting in less wear.
- Suitable for high speed and higher temperature applications.
- Known as dust sealing because it effectively protects against dry dust.
Because of the minimal friction and wear, these bearings are often used in industrial and high-speed applications where low contamination is present.
Bearings with 2RS seal
The 2RS seal (Rubber Seal) consists of a rubber steel plate that drags with a rubber lip in a groove on the inner ring of the bearing. This provides:
- Some friction, limiting the speed to about 70% of the maximum speed of an open bearing.
- Excellent seal against moisture and dirt, contributing to longer life.
- A temperature range of -30° and +110°C, making it suitable for various environments.
Bearings with a 2RS seal are often used in applications where there is moderate contamination or where splash protection is desired.
Which seal do you choose?
The choice between a ZZ and a 2RS seal depends on the specific application. Here is a brief comparison:
| Feature | ZZ seal | 2RS seal |
|---|---|---|
| Seal type | Metal plate | Rubber plate |
| Friction | No | Single |
| Wear | Very low | Slightly increased |
| Suitable for high speeds | Yes | Limited |
| Protection against dirt and moisture | Limited | High |
If you need a bearing for high speeds and minimal wear, a ZZ seal is an excellent choice. For applications where splash protection and protection from dirt are critical, a 2RS seal is the better option.