COMINTEC
22
C
nom
= C
ad
•
K
•
J
u
Ɵ
J
mot
+ J
u
Ɵ
β
=
180
•
C
mot
π
•
R
T
F
e
=
> 2
•
f
mot
R
T
•
J
u
Ɵ
+ J
mot
1
π
J
u
Ɵ
•
J
mot
GSF
R
T
GSF - bellow coupling: introduc
Ɵ
on
Hubs made in aluminum fully turned and bellow in stainless steel.
Suitable for applica
Ɵ
ons with high temperatures (> 300 °C).
High torsional rigidity and low iner
Ɵ
a.
Wear and maintenance free.
Backlash free for precision and high speeds.
Single split clamp hub (type B) and
fi
nished bore in ISO H8 tollerance and low roughness.
ON REQUEST
Single split clamp hub with H7 bore and keyway (type B1).
Two piece clamp hub with H7 bore and keyway (type C1) or without keyway (type C).
Customized manufacturing for speci
fi
c requirements.
Connec
Ɵ
on to the Torque limiter's (safety coupling) range possible.
DIMENSIONING
FITTING
Where:
C
nom
= nominal torque of the coupling
[Nm]
C
ad
= max value between accelera
Ɵ
on
torque on the motor side and decelera
Ɵ
on
torque on the user side
[Nm]
C
mot
= maximum torque on the motor side
[Nm]
F
e
= system frequency with two masses
[Hz]
f
mot
= frequency on the motor side
[Hz]
J
mot
= iner
Ɵ
a on the motor side
[Kgm
2
]
J
u
Ɵ
= iner
Ɵ
a on the user side
[Kgm
2
]
K
= load factor
R
t
= torsional rigidity of the coupling
[Nm/rad]
β
= rotation angle
[ ° ]
Load factor (K)
1,5
= con
Ɵ
nuos load
2
= discon
Ɵ
nuous load
2÷3
= machine tools
2,5÷4 = shock load
Sympli
fi
ed system with two masses.
It is advised to machine the connec
Ɵ
on's sha
Ō
s with:
•
Surface
fi
nish with Ra=1.6
μ
m.
•
Coaxial precision 0.01 mm.
•
Nominal tolerance h6.
At
fi
rst, assemble the coupling by inser
Ɵ
ng the bellow into the relevant hubs and
Ɵ
ghten the screws "S2" in sequence, respec
Ɵ
ng a cross
sequence, con
Ɵ
nuously un
Ɵ
l you obtain the
Ɵ
ghtening torque indicated in the catalogue. Insert one hub on the
fi
rst sha
Ō
along the N length
and
Ɵ
ghten the clamp locking screw "S1" with a torque wrench, respec
Ɵ
ng the
Ɵ
ghtening torque indicated on the catalogue. Leave the
second sha
Ō
slides on the opposite hub along the whole N length and
Ɵ
ghten the clamp locking screw with a torque wrench, respec
Ɵ
ng the
Ɵ
ghtening torque indicated on the catalogue.
It is important to consider that misalignments, axial, angular and parallel, must be considered paired together, as inversely propor
Ɵ
onal (one
reduces when the other increases). If all types of misalignments occur, it is necessary that the sum in percentage respect to the maximum
value doesn't exceed 100%. If the metallic bellow is damaged, the whole coupling becomes unusable, so it is advised to be very careful in
assembling and disassembling the individual components.
Servomomotor
J
mot
User
J
u
Ɵ
The GSF bellow couplings have been designed and manufactured for all applica
Ɵ
ons requiring excellent dynamic characteris
Ɵ
cs, necessary for
high speeds, fast reversing and, at the same
Ɵ
me, torsional rigidity with low iner
Ɵ
a without compromising the high reliability.
The coupling is made in three di
ff
erent and modular elements, in order to obtain high
fl
exibility in assembling and availability. The two sha
Ō
s
are connected to the bellow exploi
Ɵ
ng a simple mechanic system, easy and safe, by properly sized radial screws and without using bonding
agents. In this way the coupling is able to operate and withstand high temperatures, up to 300 °C.
The coupling allows the compensa
Ɵ
on of all possible misalignments between the two sha
Ō
s, to be connected in accordance to the values
indicated in the table, assuring an in
fi
nite number of working cycles.
The coupling's nominal torque must be higher than the maximum torque of the motor sha
Ō
, according to the generic formula on page 5.
For further checks it is useful to verify: iner
Ɵ
a on accelera
Ɵ
on / decelera
Ɵ
on, incorrect posi
Ɵ
oning in case of applica
Ɵ
on when high precision
is required, the natural frequency of the applica
Ɵ
on (simpli
fi
ed system with two masses) according to formulas: