Involute tooth shape

If the teeth are only divided into equal spacing on the outer circumference of the motorized wheel, fitted with protrusions, and then rotated in intermeshing, the following problems will occur:

Sliding of the tangent point of the gear teeth

The speed of the tangent point can be fast or slow

Vibration and noise are generated.

Therefore, it cannot be used as a gear. The need for quiet and smooth gearing led to the involute curve.

The involute curve used in the involute tooth profile is...?

A wire with a pencil tied to one end is wrapped around the outer circumference of a cylinder, and then the wire is gradually released while the wire is taut. At this point, the curve drawn by the pencil is the involute curve. The outer circumference of the cylinder is called the base circle.

The eight involute curves are drawn by loosening the thread from both sides.

Features

Since the teeth are made of the same curve, they can be engaged correctly even if the center distance is more or less inaccurate.

The processing of tooth shape is easy, so the production cost is low and the price is cheap.

The tooth root is thick and strong.

It is a representative tooth shape.

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