Sealing devices are designed to prevent the
ingress of contaminants and to retain grease in the bearing.
Seals can be loosely defined into two groups, contact and
non-contact types.
Contact types are designed to have contact present between
the seal and the race.
Non-contact types are designed to have a gap present or clearance
is present between the shield and race.
Bearings can be specified as open (no seals on either side),
a single seal, or sealed on both sides. Combinations of seals
and shields can be used depending upon the application.
Seal are available in different materials, such as, steel
shields (ZZ), perbunan rubber (RS), Teflon (TS) or viton seals
(VS). Many variations exist for materials and combinations,
creating many ways to protect and enhance the performance
of the bearing.
|
