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Bearing Covers
Sealed and Unsealed Bearings
Articles and information about skate wheel bearings
made of ceramic materials.
A skate bearing will either have non-removeable
shields on the sides, to protect it from
contamination and loss of lubrication, or it
will have removeable seals that allow the bearing
to be cleaned and re-lubricated.
Shielded
- Sealed with Contact Seals
- Sealed with Non-Contact Seals
Seals and Shields (NSK)
Seals and Shields (MINI bearings)
NSK Seals and Shields
What is a Full Contact Metal Shield?
Seal
Removeable side plates on a bearing that are usually
made of rubber or some other flexible material. Seals
provide protection against contamination and loss of
lubrication material, but seals can be removed to allow
the bearings to be cleaned. (A bearing will either have
non-removeable shields on the sides, or removeable seals.)
Seals consisting of synthetic rubber moulded to a
steel plate are incorporated into the outer rings of
these ball bearings. There are two types of sealed
bearings. One uses contact seals and the other non-contact
seals. Contact seals provide excellent dust penetration
but have a start up torque penalty, hence the send option
of non-contact seals which are designed for low
torque applications.
Shield
Non-removeable steel plates that cover the sides of a
bearing, and protect it from contamination and loss of
lubrication material. ZZ bearings have sheilds on both
sides and Z bearings have shields on one side only. a
bearing will either have non-removeable shields on the
sides, or removeable seals.
Bearing and Housing Seals
Sealed Bearing
These have rubbing seals that seal against recesses
in the inner ring shoulder. This limits the speed to around
70% of the corresponding unsealed bearing. Sealed bearings
are lubricated for life and hence under extreme conditions
life can be short. However they are becoming increasingly
popular for smaller deep groove ball bearings operating
under light loads and moderate speeds.
Shielded Bearing
Shields are non rubbing seals. Shielded bearings are
lubricated for life and hence under extreme conditions
life can be short. However they are becoming increasingly
popular for smaller deep groove ball bearings operating
under light loads and moderate speeds.
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