Zerol Bevel Gears
Zerol
Bevel gear is in essence a special type of spiral bevel gear. It is actually
a spiral bevel where the spiral angle is of zero degree. It shows both the
characteristics of straight and spiral bevel gears. Though Zerol Bevel gear
tooth are curved, but they lie in the same direction as compared to the
teeth of straight bevel gears. In case of Zerol Bevel gears, the face cone
elements do not actually pass via pitch cone apex, instead, they are almost
parallel to the root cone elements of a mating gear. This provides for an
uniform tooth clearance.
Bevel Gears of the type Zerol and spiral are cut on the same type of
machines with similar circularface-mill cutters. Further for grinding also
same grinding machines are applied. Both these Gears are manufactured with
localized tooth contact that can be easily managed for width, length width
and shape.
Manufacturing of Zerol Bevel Gears
Out of many methods available to manufacture Zerol Bevel Gears one of the
very popular method is called Continuous indexing Palloid/Cyclo Palloid
technique for curved tooth gear generation. Advantages of this technique is
that it is able to maintain accurate tooth-to-tooth spacing tolerances and
also ensures a constant and parallel tooth depth across the face width. This
results in longevity, due to improved tooth spacing and better surface
finish.
Advantages of Zerol Bevel Gears
Compared to Straight Bevel Gears the Zerol Bevel Gears offer the following
advantages:
- In case where requirement is of hardened gears of high precision. As
zerol gears can be ground they offer better option.
- Where there is only spiral type equipment, with which Bevel Gears
may be cut.
- Teeth strength is higher and also quiter.
- Zerol Bevel Gears functions as a smooth localised point contact.
This enables operations that is smooth, has good speed and high
vibrations.
- Design is comparatively advanced.
- As the curved teeth lie in complete alignment with the shaft as a
result there is very little thrust load.
