Gearboxes combine the best of both worlds
A
Brevini product story
Edited by the Engineeringtalk editorial team
Apr 7, 2006
Flexible power transmission for paper processing, conveyor drives, industrial lifting equipment, grinders, mills, sheet steel and rod machines, iron-making plants, sugar and food plants, and quarries.
Brevini's High Power Series combines the efficient epicyclic gear design of the firm's recently introduced S series of planetary gearboxes with the modular advantages provided by PIV's complementary Posired 2 family of helical and bevel-helical gearboxes.
The result is a flexible power transmission package for use in pulp and paper processing, conveyor drives, industrial and marine lifting equipment, grinders and mills, machines for working sheet steel and rod, large iron-making plants, sugar and food production plants, and quarries.
It can provide the medium and high power transmission markets with products that are easy to configure, provide high levels of torque, and are space saving and reliable.
They overcome the problems commonly experienced when using traditional bevel-helical gearboxes with high reduction ratios, that is impractical size, increased power losses and high cost.
Jon Snaith, Technical Manager at Brevini, said: "By positioning the planetary gears at the output end, where speed is slow and torque is high, and using the bevel-helical gears for the input stages we are using both elements to their best advantage".
"The design eliminates the necessity for additional cooling in almost all cases, reducing cost and increasing reliability; the combination also results in a unit that is considerably more compact and cost effective than a bevel-helical product used on its own".
The series is being launched with five standard sizes including transmission ratios from 100 to 670.
Nominal torque ratings are from 37,000 to 370,000Nm and nominal power from 160 to 950kW.
The S series planetary gearboxes use four planetary gear wheels in their epicyclic gear train, instead of the normal three, providing better load sharing and the ability to produce 40 to 60% more torque output.
The design increases the contact area of the planet gears on the central gear, increasing the rigidity and accuracy of the gearboxes and broadening the range of machines and applications that can benefit from a reduced weight and size.
The Posired 2 design complements the S series performance with high versatility and modularity in its construction.
Designed for constant speed reduction, the gearboxes suit OEM and maintenance applications, providing a nucleus of compatible components, which can be assembled into various gearing combinations.
The efficiency of cooling available from the large sump and bigger case of the Posired 2 unit is also significant as it can reduce costs in arduous applications by ensuring that additional forced cooling of the lubricating oil in the transmission system is not required.
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