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Two important principles in gearing are pitch surface area and pitch position. The pitch surface of a gear is the planetary gearbox imaginary toothless surface area that you would have got by averaging out the peaks and valleys of the average person teeth. The pitch surface of a typical gear is the form of a cylinder. The pitch angle of a equipment is the angle between the encounter of the pitch surface area and the axis.

The most familiar kinds of bevel gears have pitch angles of significantly less than 90 degrees and they are cone-shaped. This type of bevel gear is called external because the gear teeth stage outward. The pitch surfaces of meshed external bevel gears are coaxial with the gear shafts; the apexes of both surfaces are at the point of intersection of the shaft axes.

Bevel gears that have pitch angles of greater than ninety degrees have teeth that point inward and so are called internal bevel gears.

Bevel gears that have pitch angles of specifically 90 degrees possess teeth that time outward parallel with the axis and resemble the points on a crown. That is why this kind of bevel gear is called a crown gear.

Mitre gears are mating bevel gears with the same amounts of teeth and with axes in right angles.

Skew bevel gears are those that the corresponding crown gear has teeth that are directly and oblique.