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Service and maintenance
8.2 Description of maintenance and repair work
8.2.6
Servicing the brake
8.2.6.1
Wear of the spring-operated brake
The friction lining and the mechanical components of the brake are subject to wear due to
their function. For safe and fault-free operation, the brake must be checked regularly,
adjusted and, if necessary, replaced.
The following table describes the different causes of wear and their effects on the spring-
operated brake components. To be able to calculate the service life of the rotor and the
brake and to determine the stipulated maintenance intervals, the important influencing
factors must be quantified. Here the most important factors are the work of friction
transformed, the starting speed of the braking and the frequency of switching. Should
several of the causes of wear to the friction lining listed occur at the same time in a single
application, the influencing factors should be added together for the wear calculation.
Table 8- 4
Component
Friction lining
Armature disk and
flange
Braking rotor gear teeth Relative movement and
Support of the armature
disk
Springs
56
Causes of wear to the spring-operated brake
Cause
Operational braking
Emergency stops
Overlap wear when
starting up and stop-
ping the geared motor
Active braking by the
motor supported by the
brake (quick stop)
Low speed and type of
construction 'motor at
top'
Start-up wear for motor
mounting position with
vertical shaft even
when the brake is re-
leased
Friction of the brake
lining
impacts between rotor
and hub
Load change and im-
pacts in the backlash
between the armature
disk, sleeve screws and
guide pins
Axial load cycle and
shear stresses in the
springs due to radial
backlash in the arma-
ture disk
Effect
Friction lining wear
Run-in of armature disk
and flange
Wear of the teeth (pri-
marily on the rotor side)
Deflection of armature
disk, sleeve screws and
pins
Decrease in the spring
force or fatigue failure
Operating Instructions, 02/2015, 70000004023775
Influencing factor
Work of friction trans-
formed
Number of start / stop
cycles
Work of friction trans-
formed
Number of start / stop
cycles
Number of start / stop
cycles, strength of
braking torque
Number of switching
operations of the brake
BA 2320
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