CATALOGUE

Casings
The speed modulation gearboxes casings are supplied with completely machine finished outer faces and varnished
inner parts.They are made of grew cast iron EN-GJL-250 (according to the UNI EN 1561:1998 requirements).
Gears
The speed modulation gearboxes gears are made of different materials: the sun gear and planets of the planetary
gear are made of alloy steel 17NiCrMo 6-4 (according to the UNI EN 10084:2000 requirements), while the ring
gear is made of aluminium bronze CuAl10Fe2-C (according to the UNI EN 1982:2000 requirement), having
high mechanical characteristics.The sun gear and planets have straight teeth and a reduction ratio of 1/3, while
the ring gear has inner straight teeth and outer helicoidal teeth in order to couple with the adjustment worm
screw, which is made of alloy steel 16NiCr4 (according to the UNI EN 10084:2000 requirements).
The planetary gears undergo thermal treatments like case-hardening and carburizing and then they are ground.
The screw undergoes case-hardening and carburizing treatments before being thoroughly ground on both the
threads and the tangs. In case the speed modulation gearbox couples with a bevel gearbox, the Gleason ® conical
bevel gear set toothing, made of steel 17NiCrMo 6-4 (according to the UNI EN 20084:2000 requirements) is
case-hardened, carburized and run-in in pairs.The planes and holes undergo a grinding process.
Mechanical speed modulation gear boxes
Shafts
The speed modulation gearboxes shafts are made of carbon steel C45 (according to the UNI EN 10083-
2:1998 requirements); the hollow shafts on the contrary are made of steel 16NiCr4 (according to the UNI
EN 10084:2000 requirements), and they undergo case-hardening, carburizing and grinding treatments for
their inner diameters. All shafts are induction ground and case-hardened in the contact area with the bearings
and retaining rings.
Bearings and market materials
Top-quality bearings and market materials are used for the whole line.
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