Skew bevel gears are those for which the corresponding crown gear has tooth that are directly and oblique.
Mitre gears are mating bevel gears with equal numbers of teeth and with axes at right angles.
Bevel gears which have pitch angles of precisely 90 degrees possess teeth that point outward parallel with the axis and resemble the points on a crown. That’s why this kind of bevel gear is called a crown gear.
Bevel gears which have pitch angles in excess of ninety degrees possess teeth that time inward and are called internal bevel gears.
The most familiar types of bevel gears have pitch angles of less than 90 degrees and therefore are cone-shaped. This kind of bevel gear is named external since the gear teeth stage outward. The pitch areas of meshed exterior bevel gears are coaxial with the gear shafts; the apexes of both areas are at the point of intersection of the shaft axes.
Two important ideas in gearing are pitch surface area and pitch position. The pitch surface of a gear is the imaginary toothless surface that you would have got by averaging out the peaks and valleys of the individual teeth. The pitch surface of an ordinary gear is the form of a cylinder. The pitch angle of a gear is the angle between the encounter of the pitch surface and the axis.
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