Wear Of Spring-Operated Brakes - Siemens SIMOGEAR 2332 Original Mounting And Operating Instructions

Ensuring functional safety
3.8 Service and maintenance
3.8.2

Wear of spring-operated brakes

The friction lining and the mechanical components of the brake are subject to wear due to
their inherent function. For safe and fault-free operation, the brake must be regularly
checked and adjusted, and if necessary, replaced.
The following table describes the different causes of wear and their effects on the spring-
operated brake components. The important influencing factors have to be quantified in order
to calculate the service life of the rotor and the brake and determine the stipulated
maintenance intervals. Here, the most important factors are the work as a result of the
frictional force, the speed at the start of braking and the frequency of operation. If several of
the listed causes of wear to the friction lining occur at the same time in a single application,
the influencing factors should be added together when calculating the wear.
Table 3- 2
Component
Friction lining
Armature disk and
flange
Brake rotor gear
teeth
Support of the
armature disk
Springs
36
Causes of wear for spring-operated brakes
Cause
Emergency stops
Wear caused by overlap
when starting and stopping
the geared motor
Active braking by the motor
supported by the brake
(quick stop)
Low speed and mounting
position 'motor at top'
Wear when starting for
motor a mounting position
with vertical shaft, even
when the brake is open
The brake lining is
rubbing/chafing
Relative movement and
shock between the rotor
and hub
Load change and impacts in
the backlash between the
armature disk, sleeve
screws and guide pins
Axial load cycle and shear
stresses in the springs due
to radial backlash in the
armature disk
Effect
Friction lining wear
Run-in of armature disk
and flange
Wear of the teeth
(primarily on the rotor
side)
Deflection of armature
disk, sleeve screws and
pins
Decrease in the spring
force or fatigue failure
SIMOGEAR 2332 - Safety-related brake
Operating Instructions, 11/2021, A5E51390096A/RS-AA
Influencing factor
Work as a result of the
frictional force
Number of start / stop
cycles
Work as a result of the
frictional force
Number of start / stop
cycles
Number of start / stop
cycles, strength of
braking torque
Number of switching
operations of the brake