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What are the sealing types of spherical roller bearings?

wallpapers News 2021-07-22
What are the sealing types of spherical roller bearings?
The sealing of sealed spherical roller bearings can be divided into two types: self-sealing and external sealing.
Self-sealing
The bearing with its own seal is to make the bearing itself into a device with sealing performance. Such as bearings with dust caps, sealing rings, etc. This kind of seal occupies a small space, is convenient to install and disassemble, and the cost is relatively low.
External sealing
Bearing with external sealing performance device, it is manufactured into a sealing device with various performances inside the installation end cover and so on. The following 6 main factors should be considered for the selection of external sealing for sealed spherical roller bearings.
1. Bearing lubricants and types (grease and lubricating oil);
2. The working environment of the bearing and the size of the space occupied;
3. Advantages of shaft supporting structure, allowing angular deviation;
4. The circumferential speed of the sealing surface;
5. The working temperature of the bearing;
6. Manufacturing cost.
 
The external seal is divided into two types: non-contact and contact
Contact seal
A contact seal is a seal in which the seal is in contact with its relative moving parts and has no gap.
Due to the direct contact between the sealing element and the mating part, this kind of seal has relatively high friction during work and high heat generation, which is likely to cause poor lubrication, and the contact surface is easy to wear, which leads to a decrease in sealing effect and performance.
Therefore, it is only suitable for medium and low-speed working conditions. Commonly used contact seals are felt seals, cup seals, and other structural forms, which are used on different occasions.
Non-contact seal
The non-contact seal is a seal in which the seal does not contact its relative moving parts and has an appropriate gap. This type of seal has almost no frictional heat and no wear during work and is especially suitable for high-speed and high-temperature applications.
Commonly used non-contact seals are gap type, labyrinth type, and gasket type, and other different structural forms, which are used on different occasions. The gap of the non-contact seal should be as small as possible.


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