Cutting Pseudo-Elliptical Gears (Part 1)

Abstract

Up to this time elliptical gears are not used widely, because of the difficulty in their production. In this research we tried to cut pseudo-elliptical gears which could be used in place of elliptical gears and be easily produced. Namely, we cut them employing a common hobbing machine and ordinary hobbs for spur gears, though a simple attachment installed with eccentric circular cams was laid on the hobbing machine. Also, the deviation of the pseudo-elliptical gears from the elliptical ones was calculated and then it was made clear that to what value the eccentricity of an elliptical gear could be raised without injuring the ability of replacement of the elliptical gear by the pseudo-elliptical one.