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Gearing Systems : Bevel Gears

Bevel gears are gears that are designed to change the angle of the drive. Refer to the image below.

Bevel Gear

From the above picture is can be seen that a common bevel gear is very similar to spur with the way the teeth are cut. The main difference between the two is that the bevel gears teeth are set at a certain angle. Otherwise all of the rules of gear apply where the pinion and gear must be cut at the same pitch, and a gear ratio will also have to be considered. Two bevel gears that have the same number of teeth resulting in a 1:1 gear ratio are commonly referred to as miter gears.

Hypoid Gears

A hypoid gear is a special type of bevel gear that will allow the two gears to mesh when the axis of the gears are nonparallel and nonintersecting. A regular bevel gear from the image above would not be able to mesh under these conditions. The teeth of a hypoid gear are based off of rolling hyperboloids allowing the two gears to mesh under the conditions stated above. Refer to the image below to see a hypoid gear.

hypoid gear

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