INTORQ BFK470 Series, Translation Of The Original Operating Instructions

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Maintenance and repair
INTORQ | BA 14.0199 | 08/2016 38
7 Maintenance and repair
7.1 Wear of spring-applied brakes
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.
Component Cause Effect Influencing factors
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
Gear teeth of brake
rotor Relative movements and shocks
between brake rotor and brake shaft Wear of gear teeth (primarily
on the rotor side) Number of start/stop
cycles
Brake support Changing load cycles and shocks in
backlash on reversal between arma-
ture plate and cylinder pin Play of armature plate and
cylinder pin 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. 12: Causes for wear