Bevel gears connect at various angles, unlike other gears. They are used in different applications, including car differentials. They have angled teeth and can be straight or spiral. Hypoid gears have non-intersecting axes and require custom lubricants. Bevel gears are used in garage and dam gates.
A bevel gear is a gear designed to connect with a gear mounted on an axle that can be positioned at any number of angles. Classically, bevel gears are used at 90 degree angles to each other, although other types of angles can also be used. This is in contrast to other types of gears, which must generally be operated parallel to each other, or at right angles, in some specialized cases. Bevel gears are used in a number of applications including the differential gear in a car.
As the term “chamfer” suggests, the face of a bevel gear is angled. Typically, a bevel gear is conical in shape, with the teeth running along the side of the cone, and the angle of the sides can be varied, depending on the application for the gear. The bevel design allows the gear to mesh with another bevel gear at different angles, depending on how it has been machined.
In a straight bevel gear, the teeth are straight and run vertically along the cone. The problem with spur gears is that all of the impact falls on a single tooth, making the gear quite rough and leading to spalling along the gear teeth over time. For this reason, some people prefer spiral gears, in which the teeth are set at an angle, allowing pressure to be distributed so the gears mesh smoothly and evenly. Spiral bevel gears are readily available for a variety of tasks.
Hypoid bevel gears are specialized bevel gears with non-intersecting axes. These gears use a large ring gear with a smaller meshing gear and are used in applications such as car differentials, where the gears may need to rotate at different speeds in some situations. Hypoid gears require custom lubricants, because they are often subjected to a significant amount of stress.
An example of a bevel gear can be found in the operation of many garage doors. The gears used to turn the door are often set at right angles to each other, as can be seen upon close inspection. Bevel gears are also used in other types of gates and gates, such as dam gates which are often operated by the user’s manipulation of a screw that turns a bevel gear to open or close the gate.
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