10
Technical data
Overhung and axial loads for motor shaft ends
Operating Instructions – Explosion-Protected MOVI-SWITCH
®
Drives
48
The customer's overhung load F
R
always has to be less than or equal to the maximum
permitted overhung load F
RX
from the diagrams:
F
R
≤ F
RX
The following diagram shows an example of how you can read the maximum over-
hung load from the diagram:
0
200
400
600
800
1000
1200
1400
0
10
20
30
40
50
x/mm
F
RX
/N
[1]
[2]
[2]
[1]
Ø14x30
Ø19x40
60
18014402489974539
[1]
Motor with shaft diameter 14 mm, force application x at 22 mm, maximum permit-
ted overhung load F
Rx
= 600 N
[2]
Motor with shaft diameter 19 mm, force application x at 30 mm, maximum permit-
ted overhung load F
Rx
= 700 N
When determining the overhung load, a transmission element factor f
Z
must be con-
sidered under certain conditions. This factor depends on the used transmission ele-
ments, such as gear wheels, chains, V-belts, flat belts or toothed belts.
When belt pulleys are used, the initial belt tension must be considered as well. In total,
the overhung loads F
R
calculated with the transmission element factor must not ex-
ceed the maximum permitted overhung load of the motor F
RX
.
Transmission element
Transmission element
factor f
Z
Comments
Direct drive
1.0
–
Gear wheels
1.0
≥ 17 teeth
Gear wheels
1.15
< 17 teeth
Sprockets
1.0
≥ 20 teeth
Sprockets
1.25
< 20 teeth
Narrow V-belt
1.75
Influence of pretensioning
Flat belt
2.50
Influence of pretensioning
Toothed belt
1.50
Influence of pretensioning
Gear rack
1.15
< 17 teeth (pinion)
The resulting customer overhung load is calculated using the following equation:
F
R
× f
z
≤ F
Rx
25988670/EN – 04/2020
