MOTOVARIO
Information
10
Information
Helical bevel geared motors
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
(lbf) Resulting radial load
M
(in-lb) 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 13 - 14
x
= distance from the point of application of the load to the shaft shoulder
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:
(**Fr
2
)
Max. admissible value of the reducer; verify max. admissible value on performances tables.
B
A42
A52 A53
A72 A73
a
4.13
4.69
5.71
b
3.35
3.70
4.57
D-S-P (Fr2 max**)
-
-
2248
C (Fr2 max**)
674
899
1236
B
063
083
103
123
143
153
163
a
5.08
7.48
8.86
10.31
12.05
13.70
18.43
b
3.94
5.91
6.89
7.95
9.29
10.94
14.29
D-S-P (Fr2 max**)
2698
4047
4946
6744
8992
14613
17985
C (Fr2 max**)
1798
2698
3372
4496
8992
14613
14613
Overhung load
Output radial loads