Bevel gear can be classified in the following types:
- Straight bevel gears are similar to the spur gears where the teeth are in straight line. The taper towards the apex of the cone. These exhibit the same properties of spur gear. The tooth are engaged at once, and this results in noise and friction.
- Spiral bevel gears are those which have curved teeth. They are similar to the spiral gears and the tooth contact is gradual. It progresses as the teeth rotate. These help in reducing noise and increasing torque carrying capacity.
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.