COMINTEC
26
GAS/SG-ST - backlash free jaw coupling
ͪ
in steel
ͫ
: introduc
Ɵ
on
Made in steel fully turned with standard phospha
Ɵ
ng treatment.
Several elastomer hardnesses available (page 27).
High torsional ridigity.
Electric insula
Ɵ
on between the parts.
Sta
Ɵ
cally balanced.
Version with integrated locking assemblies (GAS/SG/CCE page 29).
ON REQUEST
Conformity to direc
Ɵ
ve ATEX possible.
Speci
fi
c surface treatments or fully stainless steel version.
Customized manufacturing for speci
fi
c requirements.
Connec
Ɵ
on to the Torque limiter's (safety coupling) range possible.
DESCRIPTION OF THE ELASTOMERIC ELEMENT
ATEX CONFORMITY
The fundamental item of this coupling is the elastomeric element or elastomer, made in polyurethane and
available in several hardness grades, for di
ff
erent uses and applica
Ɵ
ons. The elastomer is manufactured to
resist ageing, scoring, fa
Ɵ
gue, hydrolysis and UV radia
Ɵ
ons, promo
Ɵ
ng longer life opera
Ɵ
on. It also resists
main chemical agents, like ozone, oils, grease and hydrocarbons.
The elastomeric element becomes prestressed during the assembly between the relevant hub's teeth, in
order to be able to transmit the mo
Ɵ
on without backlash, so torsionally rigid inside the prestressing load.
The prestressed elastomer's surface is su
ffi
ciently wide to induce a low contact pressure on the tooth of the
same elastomer, reducing permanent deforma
Ɵ
ons and promo
Ɵ
ng a long life.
The GAS/SG coupling can be supplied in accordance to direc
Ɵ
ve 94/9/CE ATEX, which is relevant to
protec
Ɵ
on apparatus and systems for use in poten
Ɵ
ally explosive spaces.
The dimensions of this coupling's version are not di
ff
erent from the standard version.
A mark relevant to the coupling's performances is printed on the hubs. It is necessary to consider
planned tests, like those in the use and maintenance manual supplied together with each ATEX coupling.
The elastomeric elements used can be:
•
red elas
Ɵ
c element in polyurethane, 98 Shore-A :
II 2 G D c T6 -20
≤
Ta
≤
+60°C X U
•
yellow elas
Ɵ
c element in polyurethane, 92 Shore-A :
II 2 G D c T5 -20
≤
Ta
≤
+80°C X U
Hub
M1
Hub
M2
Hub
M1L
The coupling GAS/SG is an elastomeric coupling with compact dimensions composed of two hubs made in steel UNI EN10083/98, fully turned
and one elastomeric element.
The hub's tooth pro
fi
le is designed to allow the elastomeric element to work only by compression and not in shear, allowing for a longer life
of the coupling in high reversal or load applica
Ɵ
ons.
The presence of the elastomer assures:
- the possibility to absorb collisions and vibra
Ɵ
ons;
- to compensate for unavoidable misalignments between the sha
Ō
s;
- silence during transmission.
The basic series of GAS/SG is composed of di
ff
erent details that can be assembled together in order to get the right con
fi
gura
Ɵ
on for the
applica
Ɵ
on:
• Hub 1 (M1):
hub base for any type of connec
Ɵ
on
• Long hub 1 (M1L):
extended hub for connec
Ɵ
ng long sha
Ō
s
• Hub 2 (M2) :
hub with external diameter lowered for assembly in con
fi
ned spaces