CHIARAVALLI
GFAS COUPLINGS SELECTION AND SIZING CRITERIA
36
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The satisfactory operation and the useful working life of flexible toothed couplings depends on the correct selection of
the couplings, as well as on the compatibility of the operating conditions with the performance provided by the coupling.
It is essential therefore, to highlight the limiting performance of the couplings and to clarify the actions of the external
loads that are exerted on the corresponding couplings.
The basic design ensures that all the couplings are capable of compensating a static angular or assembly misalignment
equal to 1 degree and this is ensured by the minimum construction tolerance between the teeth.
The dynamic angular or operating misalignment must never be greater than 0.5 degrees, even if the recommended
values should not be greater than 0.25 degrees.
The declared nominal torque values and the maximum rotating speeds indicated refer to an angular or composite misa-
lignment that does not exceed 1/12 of a degree (5 prime divisions).
The ‘exceptional’ torque values that can be supported as a transient and during the acceleration phases must not be
exerted for more than 10-15 seconds and must not occur for more than 5 events/hour.
Fatigue durations are calculated for a conventional limit of 50 million cycles, considering two load cycles for each revo-
lution of the coupling.
Misalignments exceeding 1/8 degrees (7.5 prime divisions) penalise by decreasing the nominal torque and the maximum
rotating speed declared for the individual couplings.
The performance of the coupling in terms of torque, limiting speed and useful working life will decrease or increase
compared with the declared values in the case of operating conditions that differ from the conditions specified above
or for “fixed-term” durations.
The design data has been tested for the purpose of ensuring a reasonable safety margin. The declared performance
therefore, is to be understood as valid for a Service Factor equal to 1.
Use of the prescribed lubricants and compliance with the recommended restore time intervals represent the precondi-
tions to achieve the performance as described
in the catalogue. The CHIARAVALLI GROUP SpA Technical Department is available to advise users in selecting the type
of coupling most appropriate for the actual operating conditions and to make recommendations in relation to special
operating conditions.
N.B.
Class G 2.5 dynamic balancing in compliance
with ISO 1940 is recommended for actual opera-
ting speeds that exceed 3,600 r.p.m.
Couplings can operate with a parallel misalign-
ment value that is double the suggested value and
assembly with a misalignment value that is four
times greater than the suggested value in excep-
tional cases.
(1) Referred to the normal coupling complete with maximum bore without keyway.
TECHNICAL DATA
Power Factor
Torque
Power transmitted in Kw
COUPLING
Kw
Kw
Nm
at r.p.m.
r.p.m.
max radial
TYPE
r.p.m.
750
1000
1500
3000
r.p.m.
recommended
misalignment
mass
J
normal
except.
normal
except.
normal
normal
normal
normal
max
limit
mm
kg
kg cm
2
GFAS 25
0,061 0,157
600
1.524
45
61
91
183
6.000
5.000
-
1,35
7,31
GFAS 32
0,103 0,259
1.000
2.520
77
103
154
309
5.000
4.000
-
2,43
19,15
GFAS 40
0,128 0,322
1.250
3.125
96
128
192
384
4.200
3.000
-
3,64
34,13
GFAS 56
0,257 0,639
2.500
6.200
192
257
385
-
3.500
2.200
-
6,07
96,56
GFAS 63
0,412 0,985
4.000
9.260
309
412
618
-
3.000
1.600
-
10,00
207,32
GFAS 80
0,773 1,855
7.500 18.000
579
773
-
-
2.600
1.200
-
19,18
492,6
GFAS 100
1,236 2,937 12.000 28.500
927
-
-
-
1.400
700
-
28,00
1.064,00
CHIARAVALLI GROUP
BRAND
GIFLEX
®
GFAS COUPLINGS:
SIZING AND SELECTION CRITERIA