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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 that the prescribed maintenance intervals can be specified accurately. The most important fac-
tors in this context are the applied friction energy, the initial speed of rotation of braking and the operating
frequency. If several of the causes of friction lining wear occur in an application at the same time, the influ-
encing factors should be added together when the amount of wear is calculated. The calculation of the ser-
vice interval can be supported by the design program INTORQ-Select.
Component
Cause
Friction lining
Braking during operation
Emergency stops
Overlapping wear during start and stop of
drive
Active braking via the drive motor with sup-
port 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
counter friction
face
Gear teeth of
Relative movements and shocks between
brake rotor
brake rotor and brake shaft
Brake support
Load reversals and jerks in the backlash
between armature plate, adjustment tubes
and guide pins
Springs
Axial load cycle and shear stress of springs
through radial backlash on reversal of arma-
ture plate
Tab. 7:
Causes for wear
INTORQ | BA 14.0197 | 04/2016
NOTICE
Braking torque reduction
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.
41.
Effect
Wear of the friction lining
Run-in of armature plate and
counter friction face
Wear of gear teeth (primarily
on the rotor side)
Breaking of armature plate,
adjustment tubes 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
operations of brake
40
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