Pinion

 ( Gears ) 

A pinion is a round gear—usually the smaller of two meshed gears—used in several applications, including drivetrain and rack and pinion systems.

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Applications

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Drivetrain usually feature a gear known as the pinion, which may vary in different systems, including

• the typically smaller gear in a Gear train (although in the first commercially successful steam locomotive—the Salamanca—the pinion was rather large).
  (2025). 9781555898465, American Gear Manufacturers Association. ISBN 9781555898465
  In many cases, such as , the pinion is also the drive gear for a reduction in speed, since electric motors operate at higher speed and lower torque than desirable at the wheels. However the reverse is true in watches, where gear trains commence with a high-torque, low-speed spring and terminate in the fast-and-weak escapement.
• the smaller gear that drives in a 90-degree angle towards a crown gear in a differential drive.
• the small front sprocket on a chain driven motorcycle.
• the clutch bell gear when paired with a centrifugal clutch, in radio-controlled cars with an engine (e.g., nitro).

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Rack and pinion In rack and pinion systems, the pinion is the round gear that engages and moves along the linear rack.

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See also

• List of gear nomenclature

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