In order to keep the bearing in good lubrication condition and normal working environment, give full play to the working performance of the bearing and prolong the service life, the rolling bearing must have a proper seal to prevent leakage of lubricant and invasion of dust, moisture or other dirt. .
Bearing seals can be divided into self-contained seals and external seals. The so-called bearing self-contained seal is to manufacture the bearing itself into a device with sealing performance. Such as bearings with dust cover, sealing ring and so on. The seal has a small footprint, is easy to install and disassemble, and has a relatively low cost.
The so-called bearing external sealing performance device is a sealing device having various properties manufactured inside a mounting end cap or the like.
The choice of bearing seals should consider the following main factors:
1. Bearing lubricants and types (greases and lubricants);
2. The working environment of the bearing, the size of the occupied space;
3. The advantage of the support structure of the shaft allows angular deviation;
4. The circumferential speed of the sealing surface;
5. The working temperature of the bearing;
6. Manufacturing costs.
The external seal is divided into two types: non-contact type and contact type. The description is as follows:
1) Non-contact seal
A non-contact seal is one in which the seal does not touch its relatively moving parts and has a suitable clearance. This form of sealing, which generates almost no frictional heat during operation, is free of wear and is particularly suitable for high speed and high temperature applications. Non-contact seals are commonly used in a variety of different structural forms, such as gap type, labyrinth and washer type, for different applications.
The gap of the non-contact seal is preferably as small as possible.
2) Contact seal
A contact seal is a seal in which the seal is in contact with its relatively moving parts and has no gaps. Since the sealing member is in direct contact with the fitting member, the friction is large during work, and the heat generation is large, which is liable to cause poor lubrication, and the contact surface is easily worn, thereby causing a decrease in sealing effect and performance. Therefore, it is only suitable for medium and low speed working conditions. Contact seals are commonly used in the form of felt seals, cup seals, etc., and are used in different applications.
According to the working conditions of the bearing and the working environment, the sealing degree is often used in engineering design to achieve a better sealing effect.
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Label: Sealed form Bearing seal Sealing effect Sealing performance Sealing degree
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