MOTOVARIO
Information
10
Information
Helical geared motors
Overhung load
Output radial loads
The value of the admissible radial load (lb) is given in the tables relating to the perfor-
mance of the gear reducer at issue. It is related to the load applied on the centre line of
the shaft and in the most unfavourable conditions of angle of application and direction of
rotation.
The maximum admissible axial loads are 1/5 of the value of the given radial load when
they are applied in combination with the radial load.
The tables relating to the output shafts give the maximum admissible value. This value
must never be exceeded since it relates to the strength of the case.
Particular conditions of radial load higher than the limits of the catalogue may occur. In
this case, call our Technical Sevice and provide details on the application: direction of the
load, direction of rotation of the shaft, type of service.
In case of double extension shafts with radial load applied on both ends, the max. ad-
missible radial loads must be defined according to the specific running conditions, in this
case call our Technical Service.
The radial load on the shaft is calculated with the following formula:
Fre
(lb)
Resulting radial load
M
(ib-in)
Torque on the shaft
D
(in)
Diameter of the transmission member mounted on the shaft
Fr
(lb)
Value of the maximum admitted radial load
Fr1
-
Fr2
(see relative tables)
fz
=
1.1 gear pinion
1.4 chain wheel
1.7 v-pulley
2.5 flat pulley
When the resulting radial load is not applied on the centre line of the shaft, it is necessary
to adjust the admissible radial load Fr1-2 with the following formula:
a
,
b
= values given in the tables on page 10 - 11
x
= distance from the point of application of the load to the shaft shoulder
or
D
When the radial load is not on the centre line of the shaft, it is necessary to adjust the admissible radial load Fr2 with the following formula:
H
032 033
042 043
052 053
062 063
082 083
102 103
122 123
142 143
a
4.72
5.43
6.65
7.68
9.37
11.06
13.03
14.45
b
3.78
4.25
5.28
6.10
7.40
8.70
10.28
11.10
Fr2 max(**)
1236
1484
1798
2698
4047
4946
6744
12365
H
041
051
061
081
101
121
a
3.50
3.86
4.53
5.94
8.27
9.13
b
3.11
2.87
3.35
4.37
6.10
6.97
Fr2 max(**)
225
562
832
899
1124
1349
Fa max (*)
1236
1461
1574
1911
2585
3035
H
A31
A41
A51
A61
A32 A33
A42 A43
A52 A53
A62 A63
a
3.09
3.19
3.27
4.06
4.13
4.53
5.31
6.10
b
2.30
2.40
2.28
2.87
3.35
3.54
4.13
4.53
Fr2 max(**)
247
247
674
1012
450
967
1349
1798
(**Fr
2
)
Max. admissible value of the reducer; verify max. admissible value on performances tables.
(*) Max. axial load admissible in only one direction with the use of a thrust bearing (on request).