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Maintenance and repair
7
Maintenance and repair
7.1
Wear of spring-applied brakes
INTORQ spring-applied brakes are wear-resistant and designed for long maintenance intervals. The friction
lining and braking mechanism are subject to operational wear. For safe and trouble-free operation, the brake
must be checked at regular intervals or replaced, if necessary
The table below shows the different causes of wear and their impact on the components of the spring-applied
brake. The influential factors must be quantified so that the service life of the rotor and brake can be calcu-
lated and so the prescribed maintenance intervals can be specified accurately. The most important factors
in this context are the applied friction energy, the initial speed of rotation of braking and the switching fre-
quency. If several of the causes of friction lining wear occur in an application at the same time, the influencing
factors should be added together when the amount of wear is calculated.
Component
Cause
Friction lining
Braking during operation
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
Armature plate and
Rubbing of brake lining
flange
Gear teeth of brake
Relative movements and shocks
rotor
between brake rotor and brake shaft
Brake support
Load reversals and jerks in the back-
lash between the armature plate and
guide pins
Springs
Axial load cycle and shear stress of
springs through radial backlash on
reversal of armature plate
Tab. 7:
Causes for wear
INTORQ | BA 14.0196 | 04/2016
NOTICE
The air gap must not be re-adjusted after it has been correctly adjusted during the initial
installation of the brake on the motor! This could result in a loss of braking torque.
43.
Effect
Wear of friction lining
Armature plate and flange
are run in
Wear of gear teeth (primarily
on the rotor side)
Breaking of armature plate
and guide pins
Reduced spring force or
fatigue failure
Influencing factors
Friction work
Number of start-stop
cycles
Friction work
Number of start-stop
cycles
Number of start/stop
cycles, braking torque
Number of switching oper-
ations of brake
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