CHIARAVALLI
CHIARAVALLI GROUP
BRAND
GIFLEX
®
SERIES GFAS
with STEEL BELL
FLEXIBLE TOOTHED COUPLINGS WITH DUAL CURVATURE
“GIFLEX
®
” SERIES GFAS with STEEL BELL
PRESENTATION
The
“GIFLEX
®
” GFAS
range of flexible couplings represent
couplings designed with a compact structure for industrial
applications, torsionally rigid and capable of compensating
angular, parallel and combined misalignments.
The special configuration with the single-piece sleeve and
the seals at the two ends renders the couplings suitable for
use in aggressive environments and in particularly deman-
ding operating conditions. The performance complies with
the characteristics of a dual articulation, constant-velocity
coupling intended to be used both for general and specific
applications and with the possibility of also being mounted
on shafts with a large free gap.
The operating limits defined by the maximum torque, by the
rotating speed and the permitted angular misalignment are
the result of a design based on a targeted choice of mate-
rials, the heat treatment and the toothing geometry.
The reliability of the stated operating limits has been con-
firmed by testing the fatigue limits both at the surface pres-
sure (Hertzian pressure) and at bending and to destructive
wear in accordance with calculation schemes based on the
most authoritative international standards.
The CHIARAVALLI GROUP SpA Technical Department is
available however, to examine problems that relate to the
choice, application and maintenance of couplings in colla-
boration with users.
On specific request, special couplings by their shape,
execution and performance can be offered and produ-
ced, as an alternative to the normal execution couplings.
For example:
- Couplings designed for high angular and parallel misa-
lignments.
- Couplings manufactured using high resistance steel and
with surface hardening heat treatment.
- Couplings with case hardened and hardened hubs and
toothing finished by machine tools after heat treatment
(skiving using a hard metal tool).
- Special couplings manufactured to a drawing.
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STRUCTURAL CHARACTERISTICS
The
GFAS
range of compact couplings, comprise two toothed
hubs and an external connecting single-piece sleeve.
The lubricant seal inside the coupling is ensured by two ring
gaskets, arranged at the two ends of the sleeve and held in posi-
tion by spring washers (Seeger washers).
Two threaded dowels arranged radially on the sleeve in a counter-
position allow a solid lubricant to be adopted.
The toothing adopted for the two hubs is profile corrected and has
a progressive dual curvature achieved by machine the toothing on
a fully Numerically Controlled gear cutting machine.
The sleeve’s profile corrected toothing, which has a parallel gene-
ratrix, is obtained using a shaping tool.
The toothing is produced to category 7 precision, in compliance
with DIN 3972 and has a degree of finish with a surface roughness
of not more than Ra = 1.4 micrometres, thanks to the machi-ning
technology adopted.
Both the hubs and the sleeve are manufactured using hardened
and tempered carbon steel with a tensile stress resistance of 800
N/mm. The couplings are subjected to a surface hardening
thermo-chemical treatment at the end of the machining stage,
which ensures a high resistance to wear and seizure and also con-
fers a high resistance to corrosion caused by atmospheric agents.
The perfect seal achieved by the gaskets ensures the required lu-
bricant containment and prevents penetration of contaminating
elements from outside, thereby contributing to increase the ave-
rage useful working life of the coupling, even if operating in an
aggressive environment.
The two toothed hub bands are positioned at the maximum di-
stance permitted by the sleeve length. This arrangement ensures
a minimum angular misalignment for a given parallel misalignment
and enhances the coupling’s constant-velocity features.
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