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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). In many cases, such as remote controlled toys, the pinion is also the drive gear for a reduction in speed.[further explanation needed]
- 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).
Rack and pinion
In rack and pinion system, the pinion is the round gear that engages and moves along the linear rack.
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