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Why do gears have a gear ratio?

Updated: 12/16/2022
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6y ago

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When one gear is used to drive another, the number of teeth on each gear will factor into the ratio. Even if the number is the same it will have a 1 to 1 ratio.

In a rear axle, for example, a common ratio is 41 teeth on the ring gear (driven gear) and 11 teeth on the pinion gear (drive gear). 41/11 is 3.727272 or commonly called a 3.73 to 1 ratio. It take 3.73 turns of the drive gear to get one turn of the driven gear.

If you are interested, the different ratios provide different combinations of speed and power. Thus a large gear pulling a smaller one gives speed while a smaller gear pulling a larger one gives power.

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11y ago

When one gear is used to drive another, the number of teeth on each gear will factor into the ratio. Even if the number is the same it will have a 1 to 1 ratio.

In a rear axle, for example, a common ratio is 41 teeth on the ring gear (driven gear) and 11 teeth on the pinion gear (drive gear). 41/11 is 3.727272 or commonly called a 3.73 to 1 ratio. It take 3.73 turns of the drive gear to get one turn of the driven gear.

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