GGT GEAR COUPLINGS – FGC SERIES
HEAT TREATMENT & RAW MATERIALS
The GGT (Green Gear transmissions Srl) gear
couplings of the FGC series are manufactured and available made of quenched and tempered steel AISI1045, AISI4140 or stainless steel AISI630. Class 12.9 bolts, galvanized steel grease nipples and o-rings in rubber NBR, Viton and/or silicone,
a) C a l c u l a te t h e t o r q u e t o b e transmitted, considering service factor SF (see fig.4)and torque factor KD, following the formula on the right;
b) Confirm the preliminary election by cross checking the diameter of the shafts to be fitted onto the hubs;
c) Check that max speed n has to be equal or lower than the selected size coupling max speed multiplied by the speed fac tor KV, depending on operating misalignment α, shown on
The principle of operation of the gear couplings, synthetically
illustrated in Figure2, is based on fitting of the external toothing of the hub with the internal toothing of the sleeve, which allows the transmission of torque between the flanges. The relative offset is compensated by the axial movement of the internal gear teeth on the outer toothing.
Using the crowned teeth, our gear couplings ensure optimal connections and torsionally rigid, between the most various machines and devices, even with moderate m i s a l i g n m e n t , a x i a l a n d r a d i a l displacements. Max dynamic misalignment compensated by GGT toothing:
– Standard Gear Couplings: 0°20’
– With additional heat treatment: 0°30’
The crowned gear teeth of GGT gear couplings, FGC series, have been designed to ensure conditions of misalignment in a larger contact surface. The displacement of the used profile determines the increase of the thickness of the tooth and therefore the resistance of the teeth.