A design tool for the contact pattern analysis, based both on analytical algorithms and on FEM models generated
automatically, has been developed for Gleason Spiral Bevels gears, that are widely used in aerospace transmissions. The
conjugate surfaces theory is applied at the generationof the tooth flank surfaces, by simulating the manufacturing process
of the pinion and the gear defined by a Gleason summary. Then an analytical Tooth Contact Analysis is performed in
order to determine the theoretical contact points on the flank surfaces versus the meshing position, taking into account
misalignments. The Hertz theory is applied to calculate the axes of the theoretical contact ellipses without considering
load sharing. Finite Elements models of the gear pair are automatically generated, in order to consider load sharing. The
FEM models include the gear blanks and take into account misalignments.

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