A crown gear (also known as a face gear or a contrate gear) is a gear which has teeth that project at right angles to the face of the wheel. In particular, a crown gear is a type of bevel gear where the pitch cone angle is 90 degrees.[1] [2] A pitch cone of any other angle is simply called a bevel gear.[3] Crown gears normally mesh with other bevel gears, or sometimes spur gears, a typical use being a crown gear and pinion system which allows a rotary motion to be shifted 90 degrees.
. Franklin D. Jones. Gear Design Simplified. 3. 1984. 978-0-8311-1159-5. 48. Industrial Press .