Abstract
Face gears can be substituted for bevel gears or hypoid gears. However they can be used only in restricted applications today. Recently, a new application of face gears for helicopter transmissions has been proposed and face gears have attracted special interest. In the face gears, generally, the pinion is a conventional spur or helical gear with involute form. In this paper, a face gear adopting arcuate tooth profile on the pinion was proposed. And the effects of the radius of the arcuate tooth profile on the constitution of the surface of contact and on the tooth contact patterns was clarified. As a result of the numerical analysis, it was clarified that the face gear with large tooth contact pattern could be designed by choosing appropriate type and radius of the arcuate tooth form.
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