Gear
For the gear-like device used to drive a roller chain, see Sprocket.
This article is about mechanical gears. For other uses, seeGear (disambiguation).
“Gears” redirects here. For other uses, see Gears (disambiguation).
Two meshing gears transmitting rotational motion. Note that the smaller gear is rotating faster. Although the larger gear is rotating less quickly, its torque is proportionally greater. One subtlety of this particular arrangement is that the linear speed at the pitch diameter is the same on both gears.
Multiple reducer gears in microwave oven (ruler for scale)
A gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. Geared devices can change the speed, torque, and direction of a power source. Gears almost always produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered asimple machine. The teeth on the two meshing gears all have the same shape.[1]Two or more meshing gears, working in a sequence, are called a gear train or atransmission. A gear can mesh with a linear toothed part, called a rack, thereby producingtranslation instead of rotation.
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