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Legend to Figure 16:
c… Clearance rf… Fillet radius
hg… Gable height a… Addendum
l g… Gable angle b… Dedendum
cf… Chamfer width ht… whole depth

Curvic couplings do not have a fully rounded root as the Hirth coupling. The
stub tooth proportions of Curvics still allow sufficient fillet radii and a large area
with a gable bottom [2].

12.4.1 Flank Surfaces and Tooth Contact Analysis

Curvic coupling design and optimization is integrated into the GEMS software
system. Just recently, the software for flank surface generation was developed
and added to the Curvic module in GEMS. After the design calculation, a thor-
ough checking of the tooth contact area and even the topland chamfer or top-
land rounding is possible with the TCA module. The TCA module also calcu-
lates effective backlash and root clearance. Figure 17 shows the Ease-Offs of
both tooth flanks of a fixed Curvic coupling with 30° topland chamfers with a
chamfer depth of 0.3mm. The Ease-Offs are based on coupling member 2
(gear). The center portion in the Ease-Offs is flat, without any crowning. On top
of the Ease-Offs the reliefs created by the topland chamfers of member two
are visible. At the bottom of the Ease-Offs, the reliefs from the member one
topland chamfers can be observed.

Figure 17: Curvic contact analysis

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