Bevel gear system is used where change of direction of the power transmission is required. These are mostly used on shafts which are perpendicular to each other. Though, the angle can also be changed as per the users requirements.
Bevel gear can be classified in the following types:
Hypoid bevel gear is generally used where the plane has different axes.This construction is similar to that of a worm drive. The pitch surface in this case is hypoid and not canonical as compared to other bevel gears.