Helical gears are cylindrical gears whose teeth are not parallel to the axis of rotation. The teeth are angled and appear as a segment of a helix. Helical gears can transmit power between parallel or ...

Spiral bevel gears are similar to helical gears with angled teeth allowing incremental interlock between gears, resulting in quieter operation. Spiral bevel gears with teeth angled are 0° are known as ...