Maintenance and repair
INTORQ | BA 14.0214 | 10/2019
47
8
Maintenance and repair
INTORQ spring-applied brakes are wear-resistant and designed for long maintenance intervals. The fric-
tion lining and braking mechanism are subject to operational wear. To ensure safe and trouble-free opera-
tions, the brake must be checked at regular intervals and replaced when necessary (refer to the table
Maintenance intervals BFK458).
8.1
Wear of spring-applied brakes
WARNING
Braking torque reduction
The system must
not
be allowed to continue operations after the maximum air gap s
Lmax
has been exceeded. Exceeding the maximum air gap can cause a major reduction in the
braking torque!
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
factors in this context are the applied friction work, the initial speed of rotation of braking and the operating fre-
quency. If several of the causes of friction lining wear occur in an application at the same time, the effects
should be added together when the amount of wear is calculated.
Component
Cause
Effect
Influencing factors
Friction lining
Braking during operation
Wear of the 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 flange
Rubbing and friction of the brake lining
Armature plate and
flange are run in
Friction work
Gear teeth of
brake rotor
Relative movements and shocks between brake
rotor and brake hub / toothed shaft
Wear of gear teeth
(primarily on the rotor
side)
Number of start/stop
cycles
Brake support
Load reversals and jerks in the backlash
between the armature plate and guide pins
Breaking of armature
plate and guide pins
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 oper-
ations of brake
Tab. 11:
Causes for wear
