j | BA 14.0168 | 10/2013
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7 Maintenance/repair
7.1 Wear of spring-applied brakes
The following table describes the different causes of wear and their effects on the components
of the spring-applied brake. The important influencing factors must be quantified so that t he
service life of the rotor a nd brake can be calculated and that the maintenance intervals to be
prescribed can be specified precisely. The most important factors in this context are the
applied friction energy, the initial speed of braking and the operating frequency. If several of
the causes of friction lining wear occur in an application at the same time, the influencing
factors are to be added together when the amount of wear is calculated.
Component Cause Effect Influencing f actors
Friction lining Braking during operation
Wear of friction lining
Friction work
Emergency stops
Overlapping wear during start and
stop of drive
Active braking via the drive motor
with support of brake (quick stop)
Starting wear in case of motor
mounting position with vertical
shaft, even when the brake is not
applied
Number of start/stop cycles
Armature plate and
counter friction face
Rubbing of brake lining Run-in of armature plate and
counter friction face
Friction work
Splining of brake rotor Relative movements and shocks
between brake rotor and brake
shaft
Wear of splining (primarily on the
rotor side)
Number of start/stop cycles
Brake support Load alternation and jerks in the
backlash between armature plate,
sleeve bolts and guide bolt
Breaking of armature plate, sleeve
bolts and guide bolt
Number of start/stop cycles,
braking torque
Springs Axial load cycle and shear stress of
springs through radial backlash on
reversal of armature plate
Reduced spring force or fatigue
failure
Number of switching operations of
brake
Tab. 9 Causes for wear
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