beval gearbox

Two important ideas in gearing are pitch surface area and pitch angle. The pitch surface area of a gear is the imaginary toothless surface area that you would have by beval gearbox averaging out the peaks and valleys of the individual teeth. The pitch surface area of a typical gear is the form of a cylinder. The pitch angle of a gear is the angle between the face of the pitch surface 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 kind 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 the two surfaces are at the point of intersection of the shaft axes.

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

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

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

Skew bevel gears are those for which the corresponding crown equipment has teeth that are directly and oblique.