The additional seal device combination bearing can effectively prevent outside foreign intrusion, but the additional seal device of the axial size increases mechanism, combined bearings use and installation repair inconvenience, at the same time, the sealing performance is also affected by the shaft diameter and influence the machining precision and the shell to match parts of the tolerance. FAG bearing and seal can not only have a good sealing and lubricating environment, and can solve the problem of supporting parts, but also can save complex lubrication system. So the strict requirements for sealing parts of the structure is compact, sealed bearings, are recommended. Combined bearing self seal has good dustproof, sealing effect, but also in the FAG running process of the bearing lubricant supply not good operating condition, reduce repair costs.
Combined bearing its seal in the form of the structure is divided into contact and non-contact seal. According to the contact form can be divided into radial and axial seal. According to the structure of sealing ring sealing lip can be divided into single and double lip seal. Non-contact seal generally with dust cover and a rubber sealing ring two. The dustproof cover large seal clearance, only suitable for dust, rubber seal clearance is small, with better sealing effect. Contact seal FAG bearings are generally only rubber sealing ring is auxiliary parts. Rubber seal lip is based on certain stick force interference contact with the rotating parts of composite bearing, which has good sealing effect, but its limit rotational speed is low and high friction torque.