Pinion

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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.

[edit] See also

• 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 Spur 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

[edit] 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"