Page 148 - Gear Technology Solutions

The proportional profile is applied after the pre-correction shown in Figure 9.
Pinion and gear profile shift X1 and X2 will result in reversing the cone and shaft
angle reduction by increasing the shaft angle by the amounts of xj 1 and xj 2,
resulting in the original (nominal) shaft angle as shown in Figure 10. Although the
I
cones in Figure 9 have the same angles as the original pitch angles g and g 2I,
1
they are merely reference cones and no pitch cones. The correct pitch angles after

the proportional profile shift are still gand g 2, of the pre-corrected system. This
1
effect might surprise gear engineers when studying a bevel gear Dimension Sheet
after a proportional profile shift has been applied. Software like the Gleason
®
Coniflex Pro design and optimization software treats a V0 profile shift like an
independent, proportional pinion and gear profile shift and therefore also modifies
the pitch angles as part of the profile shift.

For experienced bevel gear designers this will require some learning experience,
however, the proportional angular pinion and gear profile shift is the geometrically
correct principle which provides significant advantages.

Figure 10: Final reference cones with nominal (original) shaft angle

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