Pinion

For other uses, see Pinion (disambiguation).

A pinion is usually the smallest gear in a gear drive train. In many cases, such as remote controlled toys, the pinion is also the drive gear. In the case of John Blenkinsop\'s The Salamanca the pinion was rather large.

The term is also commonly used to describe the smaller gear that drives in a 90-degree angle towards a crown gear in a differential drive.

See also

Look up pinion in Wiktionary, the free dictionary.

• Rack railway
• Rack and pinion

v • d • e Gears
Gear systems	Spur gear systems • Worm gear • Rack and pinion • Epicyclic (planetary) gearing • Sun and planet gear • Harmonic drive • Cycloidal drive • Non-circular gear
Gear shapes	Straight cut gear • Bevel gear • Helical gear • Hypoid gear
Geartooth profiles	Involute • Cycloid
Gear mechanics	Transmission • Differential • Gear coupling • Gear train • Bicycle gearing • Continuously variable transmission • Offset (gears)
Examples	Freewheel In Bicycles: Cassette (bicycle part) • Derailleur gears • Fixed-gear bicycle • Hub gear • Shaft-driven bicycle • Sprocket
See also	Ball screw • Leadscrew • Jackscrew • Belt drive • Chain drive • Gear manufacturing

Notes

1. ANSI/AGMA 1012-G05, "Gear Nomenclature, Definition of Terms with Symbols".

2. in the case of radio controlled cars with an engine (i.e. nitro) this pinion gear can be referred to as a "Clutch bell"

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