Maintenance/repair
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| BA 14.0197 | 11/2010
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7
Maintenance/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 the mechanical brake components are subject to
function−related wear. For safe and trouble−free operation, the brake must be checked and
readjusted at regular intervals, and, if necessary, be replaced.
The following table describes different causes of wear and their effects on the components
of the spring−applied brake. For calculating the service life of rotor and brake and determining
the maintenance intervals to be observed, the relevant factors of influence must be quantified.
The most important factors are the friction work, initial speed of braking and the operating
frequency. If several of the causes of wear indicated for the friction lining occur in an
application at the same time, the influencing factors must be added for calculating the wear.
The INTORQ Select dimensioning program can be used to calculate the maintenance
intervals.
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
flange
Rubbing of brake lining
Armature plate and flangeare run in 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
Armature plate 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
