A mechanical component with teeth that meshes with another toothed part to transmit torque and motion between rotating shafts.
A gear is a rotating machine element with cut teeth, or cogs, which mesh with another toothed part to transmit torque and rotational motion. In a gear set, the smaller gear is called the pinion, and the larger is the gear. They are fundamental components in mechanical power transmission systems, converting speed and torque according to their gear ratio, which is determined by the number of teeth. Gears are critical for precise motion control, speed reduction or increase, and direction change in machinery.
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In a gear set, the pinion is the smaller gear that drives the larger gear. Both are gears, but 'pinion' specifically refers to the driving member in the pair, often with fewer teeth.
Gear ratio is calculated as the number of teeth on the driven gear divided by the number of teeth on the driving gear (pinion). For example, if the gear has 60 teeth and the pinion has 20, the ratio is 60/20 = 3:1, meaning the gear rotates once for every three rotations of the pinion, with increased torque.
Common types include spur gears (straight teeth, parallel shafts), helical gears (angled teeth, smoother operation), bevel gears (conical, for intersecting shafts), worm gears (screw-like, for high reduction ratios), and rack and pinion (converts rotational to linear motion).
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