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The involute gear profile is the most commonly used system for gearing today. An involute is a curve that is traced by a point on a taut cord unwinding from a circle, which is called a base circle. The involute is a form of spiral, the curvature of which becomes straighter as it is drawn from a base circle and becomes a straight line at infinity. An involute drawn from a small base circle is more curved than one drawn from a larger base circle.

The involute profile can be generated using a hobbing machine with a rack form, which has a pressure angle of 14.5 degrees or 20 degrees.

Small pinions have addendum modifications to stop interference.

External link

Involute gear at How Stuff Works - with animation

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Involute gearThe involute gear profile is the most commonly used system for gearing today. An involute is a curve that is traced by a point on a taut cord unwinding from a circle, which is called a base circle. The involute is a form of spiral, the curvature of which

InvoluteIn the differential geometry of curves, an involute of a smooth curve is another curve, obtained by attaching a string to the curve and tracing the end of the string as it is wound onto the curve. It is a roulette wherein the rolling curve is a straight l

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