For SKF bearings plus seal choice should take into consideration the following major factors:
1. needle roller bearings and types of lubricants (lubricating greases and oils);
2.SKF bearing work environment, footprint size;
3. the shaft support structure advantages, allowing angular deviation;
4. the circumferential speed of the seal surface;
5. the needle bearing operating temperature;
6. manufacturing costs.
Plus seals are divided into both contact and contactless. As described below:
1) non-contact seals
Non-contact seal is the seal with its relative motion of the parts do not touch and sealed with appropriate clearance. This type of seal, virtually no frictional heat in the work, no wear, particularly suitable for high speed and high temperature applications. Non-contact sealing gap, labyrinth and washers of different structural forms, respectively, applied to different occasions.
Non-contact sealing of gaps as small as possible is good.
2)-contact seals
-Contacting seal is the seal touches with its relative motion of the parts and there is no gap seal. This sealing due to direct contact seal and fit, large friction at work, heat, easily lead to poor lubrication, interface friction losses, resulting in the sealing and performance decreases. Thus, it applies only to working conditions of medium and low speed. -Contact seals used a felt seal, Cup seal structure, apply to different occasions.
According to the SKF bearing requirements for sealing of the working conditions and the work environment, comprehensive engineering often various seal types in order to achieve a better seal.
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