A helical gear box is an improvement over straight cut spur gear because the
number of teeth meshing together is increased providing more averaging of the
gear errors. This is a drive with the steel helical gears close coupled to the
fold rolls providing solid reliability. A positive gear drive assures no
slippage between fold rolls for more consistent folds.
Helical gearbox can be single or double. In a single gear drive each shaft is
always against the thrust bearings. The external axial thrust that acts on the
gear shaft under load due to the friction in the tooth coupling, cannot cause
momentary overloading of one helix as is the case with double helical gears. An
external thrust can have some detrimental effects on a double helical gear in
connection with axial compensating shift due to tooth errors.
Additional sliding in the gear mesh requires additional lubrication and is less
efficient. These are compact, heavy-duty gear drives. They offer simple
maintenance and provide consistently reliable operation. They offer multiple
Helical gearboxes are used in some of the most demanding applications and
environments across a wide range of industries. They are widely used in material
handling conveyors, pumps and pumping equipment, mixers and agitators, packaging
machinery and specialty machinery. Crossed helical drives are used for
agriculture applications. They are also used in aircraft industry, elevators and
building systems. A helical drive in brush provides uniform power transmission
and added safety in tough cleaning situations.