Bearing is a kind of commonly used products, good bearing in the use of the process is required to have good sealing performance, and the current seal of the bearing can be divided into self-sealing and external encrypted seal two types, generally self-sealing is relatively simple, the cost is relatively low, and the bearing outside encrypted seal performance device is installed in the end cover. If the sealing device with various performances is manufactured internally, some factors should be taken into account in the sealing process if the external sealing performance is to be better.

The factors to be considered for bearing external seal are:

1, bearing lubricants and types (grease and lubricants);

2, bearing working environment, occupying the size of space;

3, the supporting structure of the shaft has the advantage of allowing angle deviation.

4, the circumferential speed of the sealing surface;

5. Bearing working temperature;

6, manufacturing costs.

According to the requirements of bearing working conditions and working environment for sealing degree, various sealing forms are often used in engineering design to achieve better sealing effect.