37
Installation and Maintenance Manual, Compact CA
3.1.14 Reduction of brake torque
Example: MDA 21 has a dynamic braking torque of 81 800 ± 4300
Nm, when the brake is not
under pressure.
Assume that the pressure in brake cylinder drain is 1.5 bar / 21.75 psi. The diagram shows that
the actual brake torque (M
act
) corresponds to only 90% of M
max
.
Motors with SPECIAL
brakes may have different
working operation. Please
make sure that you check
the
Ordering code
on
your brake.
The diagram 3.2, shows the falling braking torque M
max
for increasing pressure in the brake cylinder
drain.
Back pressure in brake cylinder drainage line.
Diagram 3.2
% Br
aking torque
Installation
Spline
Unidirectional drives
Bidirectional drives
Steel with yield strength
Rel
mm
= 450 N/mm
2
Steel with yield strength
Rel
mm
= 700 N/mm
2
The splines shall be grease with Texaco Multifak EP2 or equivalent. This is with exception for
tandem mounted MDA14, where spline shall be lubricated with hydraulic oil.
To avoid wear in the splines the installation must be within the specified tolerances in table 3.15.
For production of the shaft, see 178 2571 regarding flange mounting and 078 1516 regarding
torque arm mounting.
Tooth data
W150
Tooth profile and bottom form
DIN 5480
Tolerance
8f
Guide
Back
Pressure angle
30°
Module
5
Number of teeth
28
Pitch diameter
Ø 140
Minor diameter
Ø 139
Major diameter
Ø 149
Measure over measuring pins
159.961
Diameter of measuring pins
Ø 10
Addendum modification X M
+2.25
0
-1.62
0
-0.250
-0.085
-0.150
Table 3.15
Summary of Contents for Compact CA
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