Rolling
bearing with the main bearing is equipped with the inner ring and the
shaft with the outer ring and seat with the bearing of the bearing is
fixed by the copper bearing to ensure that the match. As
the rolling bearing is a standard part, so with the other parts, the
bearing bore as the reference hole, the outer ring is the reference
axis, with the code not marked. In
fact the bearing diameter and diameter of copper sets have a tolerance
with a small negative deviation, and the general cylinder reference hole
and the reference axis of the deviation direction, the value is not the
same, so the bearing hole and the shaft than the general cylinder Of the same kind of tie is much more important.
Rolling
bearing with the choice of type of principle Oil-free bearings should
be based on the level of speed, load size, temperature changes and other
factors to decide. With
too loose, will reduce the rotation accuracy, vibration increased; with
too tight, probably because the inner and outer ring is too large
elastic deformation of the normal operation of the bearing, but also
make the assembly and dismantling difficult. In
general, the high speed, large load, the temperature changes in the
bearing should be tight with some of the co-ordination of the bearings
should be more loose with the rotation of the ring should be tight with
some of the fulcrum of the outer ring with the loose some. With the bearing inner ring with the rotary shaft often used n6, m6,
k5, k6, j5, js6; and does not rotate the outer ring to match the bearing
hole often used J6, J7, H7, G7 and so on.
As the rolling bearing with the precautions are usually tight, in
order to facilitate the assembly, to prevent damage to the bearing,
should take a reasonable assembly method to ensure the quality of the
assembly, the combination design should also take appropriate measures.
When installing the bearing, the small bearing can be gently and evenly pressed with a copper hammer with a fit. Large bearings can be presses with presses. Large size and with the tight bearing can be heated and expanded after the hole assembly. It should be noted that the force should be applied to the assembly of the ring, otherwise it will damage the bearing. When removing bearings, special tools can be used. For ease of
disassembly, the bearing shoulder height should be lower than the inner
ring height, and the value can be checked.
Sleeve
bearings within the sleeve when the axial movement of the distance is
longer, usually tapered roller bearings, the inner and outer ring were
assembled, the operation is more convenient, and the sleeve cup hole
non-part of the diameter should be slightly larger, Both conducive to the bearing outer ring of the loading, but also reduces the hole finishing area.
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