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What are theTypes of Seals for Spherical Roller Bearings

wallpapers Products 2020-06-09
The seals of spherical roller bearings can be divided into two types: self-contained seals and external seals. The so-called bearing self-sealing means that the bearing itself is made into a device with sealing performance. Such as bearings with dust caps, sealing rings, etc. Such a seal takes up little space, is easy to install and disassemble, and has a relatively low cost.
The so-called bearing with sealing performance device is a sealing device with various performances manufactured inside the mounting end cover and the like. The following six main factors should be considered for the selection of spherical roller bearing plus seal.
1. Bearing lubricants and types (grease and lubricating oil);
2. The working environment of the bearing and the size of the occupied space;
3. The advantages of the supporting structure of the shaft, allowing angular deviation;
4. The circumferential speed of the sealing surface;
5. Working temperature of bearing;
6. Manufacturing cost.
The external seal is divided into non-contact type and contact type. It is described as follows:
1) Contact seal
A contact seal is a seal that seals its relatively moving parts without gaps. Due to the direct contact between the seal and the mating part, this type of seal has a large friction during work, and also generates a large amount of heat, which is likely to cause poor lubrication and wear and tear on the contact surface, resulting in 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 felt seals, cup seals and other structural forms, which are used in different occasions.
2) Non-contact seal
Non-contact seal means that the seal does not contact with its moving parts, and there is a proper gap. This form of seal hardly generates frictional heat or wear during work, and is especially suitable for high-speed and high-temperature occasions. Non-contact seals are commonly used in gaps, labyrinths and gaskets and other different structural forms, which are used in different occasions. The gap of the non-contact seal is preferably as small as possible.

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