Bearing installation knowledge
Bearing the installation of good or bad, will affect the bearing accuracy, life and performance. Therefore, please fully study the installation of bearings, that
is, including the following items, including the operating standards for
bearing installation.
First of all, cleaning the bearings and related parts, has been
grease lubricated bearings and double with oil seal or dust cover, seal
bearing installation without cleaning.
Second, check the size of the relevant parts and finishing situation
Third, the installation method
The installation of the bearing should be based on the bearing
structure, size and bearing parts with the nature of the fit, the
pressure should be directly attached to the tight fit of the collar
surface, not through the rolling body to send pressure, bearing
installation generally used the following methods:
(1).
The bearing inner ring and the shaft is tight fit, the outer ring and
the bearing hole is more loose fit, the press can be used to press the
bearing on the shaft, and then the shaft together with the bearing into
the bearing hole, (Copper
or mild steel), the inner diameter of the fitting casing should be
slightly larger than the diameter of the journal, and the diameter of
the outer diameter should be larger than that of the bearing inner ring Slightly smaller, so as not to pressure on the cage. Bearing
outer ring and the bearing hole in line with the inner ring and the
shaft for the loose fit, the bearing can be pressed into the bearing
hole, then the outer diameter of the assembly tube should be slightly
smaller than the diameter of the seat hole. If the bearing rings and shaft and seat holes are tight fit, the
installation of the inner and outer ring to press the shaft and seat
hole at the same time, the structure of the casing should be able to
compress both the inner and outer ring bearing end.
(2).
By heating the bearing or bearing, the use of thermal expansion will be
tight fit into a loose fit with the installation method. Is a common and laborious installation method. This
method is suitable for the installation of large bearing capacity, hot
before the bearing or separable bearing rings into the tank evenly
heated 80-100 ℃, and then removed from the oil as soon as possible to
the shaft, To
prevent cooling after the inner end of the inner and shoulder fit is not
tight, the bearing can be cooled after the axial tightening. Bearing
outer ring and light metal bearing seat tightly, the use of heating the
bearing seat of the hot method, to avoid the mating surface is subject
to abrasions. When
the bearing is heated by the tank, there shall be a grid at a distance
from the bottom of the tank, or the bearing shall be hung with a hook.
The bearing can not be placed on the bottom of the box to prevent the
impurity from entering the bearing or uneven heating. The fuel tank must
have a thermometer, Strictly
control the oil temperature shall not exceed 100 ℃, in order to prevent
the occurrence of tempering effect, so that the hardness of the ring to
reduce.
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