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



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

Rack and pinion

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

See also


  1. Gear Nomenclature, Definition of Terms with Symbols. American Gear Manufacturers Association. p. 72. ISBN 1-55589-846-7. OCLC 65562739. ANSI/AGMA 1012-G05.
  2. Eric Perez. "Clutch Tuning". Retrieved 2010-01-29.

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