Page 180 - Gear Technology Solutions

plane, where each engine uses 25 fixed Curvic couplings to connect their high-
speed compressor and expansion rotors.

Figure 14: Jet engines of airplanes use Curvic couplings to stack rotors

The main characteristic of Curvic couplings is the shape of the teeth. One
member has barrel shaped teeth while the other member has hourglass
shaped teeth. With this geometry, each single tooth when engaged in a slot of
the opposite member contributes to self-centering between the two members.
Other couplings like Coniflex or Hirth require two opposite teeth and slots to
achieve a centering of a shaft in face width direction.

Figure 15: Grinding of two convex flanks simultaneously

165