Spiral bevel gears

The arrangement of gears serves to change the rotational axis by 90° as well as reducing the rotational speed of the input drive.

Bevel gears in motion.
An animation showing how bevel gears interact.

An animation showing how a pair of spiral bevel gears interact. Notice that the blue arrow is rotating more slowly than the orange arrow.

A preview of an interactive 3D model showing spiral bevel gears.

This model uses gearing similar to that found in the Airbus H125 helicopter transmission gearbox. The helical gear design produces less vibration and noise than a conventional gear with straight teeth.

Side profile of a set of bevel gears.
A set of bevel gears.