A gear can mesh with a linear toothed part, called a rack, thereby producing translation instead of rotation. Two or more meshing gears, working in a sequence, are called a gear train or a transmission. The teeth on the two meshing gears all have the same shape. Gears almost always produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. Geared devices can change the speed, torque, and direction of a power source. For video game, see Geared (video game).Ī gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. The term describes similar devices, even when the gear ratio is continuous rather than discrete, or when the device does not actually contain gears, as in a continuously variable transmission. In transmissions with multiple gear ratios-such as bicycles, motorcycles, and cars-the term "gear" as in "first gear" refers to a gear ratio rather than an actual physical gear. When two gears mesh, if one gear is bigger than the other, a mechanical advantage is produced, with the rotational speeds, and the torques, of the two gears differing in proportion to their diameters. An advantage of gears is that the teeth of a gear prevent slippage. The gears in a transmission are analogous to the wheels in a crossed, belt pulley system.
A gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque.
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