Additional seal bearing support can effectively prevent external foreign invasion, but the additional seal will increase the axial body size, installation and maintenance to the bearings and inconvenience, while its performance has also been sealed shaft and housing match parts of the line precision and tolerance effects. The sealed bearings with either a good seal lubrication environment, but also solve the problem of supporting parts, but also eliminates the need for complex lubrication systems. So compact, sealed demanding parts, have recommended the use of sealed bearings. In addition to bearing their own good dust sealing, sealing effect, the process can not operate in the bearing lubricant supply and maintain a good running condition, reducing maintenance costs.

 

Bearing structure is divided into self-sealing by contact and non-contact seal. A contact form can be divided into radial and axial seal seals. According to the structure can be divided into single-ring lip seal and lip seal. Generally non-contact seals with dust cover and rubber ring two. Dust sealing gap, only for dust, rubber ring seal gap is small, has good sealing effect. Contact seal rubber seal bearing generally only a very secondary part. Rubber lip seals are affixed together certain parts of the interference with the rotating bearing contact, and thus play a good dust seal, but the lower speed limit and the friction torque larger.