The most commonly used gear profile is the involute profile

If only the outer circumference of the friction wheel is divided into equal pitches, the protrusions are installed, and then they mesh with each other and rotate, the following problems will occur:

The tangent point of the gear teeth produces slip
The movement speed of the tangent point is sometimes fast and sometimes slow
Vibration and noise

The gear teeth are both quiet and smooth, which is why the involute curve is born.

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