Page 153 - Gear Technology Solutions

compared to the baseline in Figure 14 and also the lost top area increased. In the
case of this example miter gearset, the V0 profile shift had a negative influence on
the tooth profiles of pinion and gear.

Figure 15: Ratio = 1.0, Ease-Off (left) and Tooth contact (right) for
X1 = 0.7 and X2 = -0.7

Figure 16 shows the result of a proportional pinion profile shift coefficient of X1 =
+0.7 and a proportional gear profile shift coefficient of X2 = +0.7 applied to the
gearset in Figure 14. The tooth contact is larger in profile than the baseline in
Figure 14 and the active working profile has significantly increased versus the
baseline. The lost top area is nearly zero and the lost root area has reduced by
30% compared to the baseline.

Figure 16: Ratio = 1.0, Ease-Off (left) and Tooth contact (right) for
X1 = 0.7 and X2 = 0.7

10.5 Practical Results

The key advantage of positive profile shift in pinion and gear is the increased
working profile in particular at the lower dedendum of the gear teeth. The first
practical results are shown in Figure 17. The contact pattern after roll testing with
marking compound shows to the left in Figure 17 the real version of the contact

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