We were discussing Basic of bearing and also various functions of a bearing during operation. We have discussed the basics and types of roller bearing in our previous post.
Today we will see here the various accessories of a
ball bearing in this post and further we will discuss the basics and types of
ball bearings.
As we have discussed the various components of a
bearing i.e. inner ring, outer ring, cage and rolling elements during our
discussion of basics of a bearing. Ball bearings will also have these components
and there will be few more accessories those are as mentioned below and
normally come with ball bearing.
- Snap ring
- Seals
- Shields
Ball bearings with snap ring
First we will see here the snap ring. Snap rings are
basically used for locating the bearing in bearing housing. Snap ring is displayed
in following figure, where we may see that snap ring is used for positioning or
locating the bearing to its desired position.
Ball bearings with seals
Ball bearings with seals are quite in demand these
days in automobile sectors and in other industrial applications also. Seals are
basically provided to cover the open area between inner ring and outer ring.
Seals prevent the entry of dirt, dust, water or
moisture and other contaminates to inside the bearing and therefore they help
the bearing to work smoothly throughout its service life.
Lubricant i.e. grease will be already provided in case
of bearings with seals and these seals will avoid the flow of lubricant from
the bearings. Usually there are two types of bearings with seals. First one is
that where bearing will have seal on one side and second one where bearing will
have seals on both side i.e. on left hand and right hand.
RS term is normally used to indicate ball bearings
with seals. RS stands here for rubber seal and this seal will be usually made by
rubber, non-synthetic or synthetic materials.
Let us see one bearing who’s bearing number is 6206 RS,
this bearing will have seal on one side only. RS indicates that bearing will
have seal on one side only.
If we have another bearing whose bearing number is
6206 2RS, in this case bearing will have seal on both sides. 2RS indicates that
bearing will have seal on both side i.e. on left hand and right hand.
Ball bearings with shields
Shields, in ball bearings, are also provided to
cover the open area between inner ring and outer ring with same objective i.e.
to avoid the entry of dirt, dust, water or moisture and other contaminates to inside
the bearing. Shield will be attached with outer ring and there will be a
clearance between shield and inner ring.
In shield bearings, extra lubricant will flow through
bearing. While in case of bearings with seals, flow of lubricant from the
bearings will be restricted. Let us see the below figure, where we can see the
ball bearings with seals, ball bearings with shields and ball bearings without
seals or shields.
Z term is normally used to indicate ball bearings
with shield. Z stands here for metal shield.
Let us see one bearing who’s bearing number is 6206 Z,
this bearing will have shield on one side only. Z indicates that bearing will
have shield on one side only.
If we have another bearing whose bearing number is
6206 ZZ, in this case bearing will have shield on both sides. ZZ indicates that
bearing will have shields on both sides i.e. on left hand side and right hand
side also.
We will discuss the ball bearings basics and also types of ball bearings in our next post.
Do you have suggestions? Please write in comment
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Reference: SKF bearing maintenance manual
Image Courtesy: Google
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