The dedendum (also shown in figure 1) is defined as 1.25/P, as it is for spur gears. The gear ratio can be given in terms of either the numbers of teeth or the pitch diameters. The gear addendum (shown in figure 1) varies from 1/P for a gear ration of 1, to 0.54/P for gear ratios of 6.8 or more. The working depth of the teeth (the addendum of the gear plus the addendum of the pinion) is 2/P as it is for spur gears. The gear pitch diameter is shown as dg in the first figure. The diametral pitch P of bevel gears is defined as the number of teeth per inch of pitch diameter. I simply used ratios of the pitch diameters, so there may be some odd sizes of shafts and lengths of the bushings for the shafts.īevel gear geometry. I found it difficult to decide on particular sizes because the pitch diameters of the gear and pinion can vary considerably as shown in the figures. There is no user control over the sizes of the shafts of either the gear or the pinion, and I leave it to you to stretch the geometry to suit any standard sizes that may be appropriate to your designs. The beveled gear with 120 teeth on the gear and 30 teeth on the pinion.
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