* Bevel gears are intended to operate on axes that intersect, usually at a 90 degree angle, to work around corners.
* Differential gears link two shafts through a covering, forcing the total of the rotational angles of the shafts to be the same as the rotational angle of the covering.
* Helical gears have angled teeth to create a thrust load on the gears when they mesh. Car transmissions often have these.
* Herringbone gears conduct power and motion between non-intersecting, parallel axes that may or may not have a center groove, with each tooth making two opposite helices.
* Hypoid gears are similar to bevel gears but differ by operating on non-intersecting axes.
* Industrial gears are round mechanical components that have "teethed" circumferences, allowing them to interconnect with corresponding teethed gear wheels or parts; these gear pairs transfer/reverse motion, increase/decrease rotational speed and torque or sychronize axes.
* Metric gears are defined by the length in millimeters of the pitch circle diameter per tooth.
* Miter gears are bevel gears put together with equal numbers of teeth and axes that are usually at right angles.
* Planetary gears come sets of usually two, or more, that operate on or inside larger industry gears. Planetary gears make drastic gear ratios possible.
* Plastic gears are made primarily of plastic, sometimes with both metal and plastic components. These gears are generally cost effective and light; some are injection molded plastic gears.
* Rear end gears are bevel gears arranged into epicyclic configurations which transmit torque and rotation through three shafts.
* Spline gears contain a series of ridges on a driveshaft that even out rotation speed of the companion piece.
* Sprockets are gears with metal teeth that enmesh with chains.
* Spur gears are cylinder shaped gears that have both straight and parallel teeth and work on parallel axes.
* Straight bevel gears have straight teeth that radiate from a center point.
* Spiral bevel gears are similar to helical gears and have a higher potential load transmission compared to straight bevel gears, which is achieved by cutting the teeth in a curved shape.
* Worm gears have a curved and recessed throat that gives the worm access to the worm gear teeth. Usually they are made of bronze, iron or steel.
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