Bearing Inspection - ThyssenKrupp Rothe Erde Manual Del Usuario

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Bearing inspection

®
Preventing damage
Wear measurements enable early detection
of technical problems before they result in
unscheduled plant stoppages. Unnecessary
repair costs and expensive production down-
times are thus avoided. We therefore recom-
mend regular bearing wear measurements
in order to assess the condition of a bearing.
The wear which affects the raceway system
makes itself felt in a change of the axial
motion or the axial reduction. Depending
on the application or bearing version, this
increase in wear can be determined by
measuring the tilting clearance or by taking
reduction measurements.
M
k
F
r
Figure 4: Loading principle of the tilting clearance
measurement (axial motion)
Measuring the tilting clearance
To determine the wear, we recommend carry-
ing out tilting clearance measurements
wherever possible. The loading principle for
such measurements is shown in fi gure 4.
The measurements are taken between the
lower companion structure and the bearing
ring which is bolted to the superstructure
(fi gure 5). The measurements must be taken
as close to the raceway system as possible
in order to minimize the impact of elastic
deformations in the companion structure.
a
F
a
Figure 5: Basic setup for measuring the
tilting clearance
The procedure is as follows:
• Take a reference measurement when
• Mark the measuring points around the
• First apply the maximum retrograde
• Swivel the superstructure and repeat the
the equipment is put into operation.
circumference starting from a defi ned
position.
moment in order to set the dial gauges to
zero (the gauges must have a measuring
accuracy of 0.01 mm). Then apply a
forward tilting moment, with load uptake
if necessary.
measurements at the marked measuring
points (see table 7 on page 19).
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