Pinion

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

This article is about a type of gear. For other uses, see Pinion (disambiguation).
Pinion and annular gear

Applications

Drivetrain

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

  • the typically smaller gear in a gear drive train (although in the first commercially successful steam locomotive—the Salamanca—the pinion was rather large).[1] In many cases, such as remote controlled toys, 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).[2]

Rack and pinion
Rack and pinion animation
Main article: rack and pinion

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

gollark: Because it is! It mostly works fine!
gollark: People talk a lot about how terrible capitalism is, and then generally just... ignore the possibility of charity.
gollark: The market system (roughly) satisfies people's values, and apparently most people's actual values don't include giving up anything to help people they don't directly interact with.
gollark: Well, yes, it isn't perfect, through broadly speaking I think stuff like people not getting food is more down to people not caring than the structure of society.
gollark: And yet we have a mostly functioning system which produces mostly enough food, and is able to make the mind-breakingly complex supply chains for that food work.

See also

References
  1. Gear Nomenclature, Definition of Terms with Symbols. American Gear Manufacturers Association. 2005. p. 72. ISBN 1-55589-846-7. OCLC 65562739. ANSI/AGMA 1012-G05.
  2. Eric Perez. "Clutch Tuning". NitroRC.com. Retrieved 2010-01-29.


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