beval gearbox

Two important concepts in gearing are pitch surface and pitch angle. The pitch surface area of a gear is the 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 an ordinary gear is the shape of a cylinder. The pitch angle of a gear is the angle between your encounter of the pitch surface area and the axis.

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

Bevel gears which have pitch angles in excess of ninety degrees have teeth that time inward and are called internal bevel gears.

Bevel gears which have pitch angles of exactly 90 degrees possess teeth that point outward parallel with the axis and resemble the beval gearbox points on a crown. That’s why this kind of bevel gear is called a crown gear.

Mitre gears are mating bevel gears with equivalent numbers of teeth and with axes in right angles.

Skew bevel gears are those that the corresponding crown equipment has the teeth that are straight and oblique.

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