ZAHNRAD MIT EINER RELATIV KLEINEN KRÜMMUNG AM KONTAKTPUNKT.

摘要

The radius of curvature of a tooth surface is increased and decreased repeatedly from a point on the pitch circles toward the addendum and deddendum without being varied monotonously. The centre of the radius of curvature positioned on the pitch circles (2, 4) at a point at which the radius of curvature is minimal. The curvature of the tooth profile curves (1, 3) is represented by a nonmonotonously varying, continuous and differentiable function with the locus of the curvature centre forming a series of continuous curves which is usually located in the vicinity of the pitch circles. Due to the tooth profile the contact ratio of the gears is set to at least unity by gradually approximating the relative curvatures of the surfaces of the gear teeth from values of involute tooth profiles to that of Wildhaber-Novikov's tooth profiles. An increase in the surface pressure and bearing stress is reduced by reducing an operating pressure angle to a relatively low level.