The sealing cover of deep groove ball bearing is mainly used to prevent the invasion of external foreign matters (solid and liquid foreign matters) and prevent the loss of bearing lubricant.
There are two sealing forms of bearing sealing cover:
1、 It is a non-contact sealing cover (the sealing cover is not in contact with the inner ring), including a stamped steel plate sealing cover (iron seal) and a non-contact rubber sealing cover.
Advantages: dustproof, high relative speed, low mute effect of metal sealing cover and relatively low price.
Disadvantages: unable to prevent the intrusion of liquid foreign matters.
2、 It is a contact sealing cover (the sealing cover has single lip or multi lip contact with the inner ring of the bearing), including a contact rubber sealing cover and a labyrinth contact sealing cover.
Advantages: dustproof, anti liquid foreign matter, high mute effect.
Disadvantages: the speed is slightly lower and the price is slightly higher.
Therefore, there is no difference between good and bad sealing covers of deep groove ball bearings, only the difference between fitting and not fitting. For example, in a clean environment, it is not necessary to use contact rubber sealing cover, which will only increase the additional cost of the manufacturer.
To sum up, there is no difference between good and bad sealing types. The main consideration is where the bearing is used, and the environmental factors of the bearing need to be considered, which is actually the sealing effect and friction coefficient.
Different seal ring structures and materials lead to different friction coefficients. If the bearing with high friction coefficient is selected at high speed, the bearing will soon break down; The other is the difference of dust-proof effect. Therefore, many factors should be considered when selecting the rubber seal or seal of the bearing.
