ABSTRACT
Conformal and high-conformal parallel-axes gearings feature convex-to-concave contact between the tooth flanks of a gear and a mating pinion. The main goal for the development of conformal gearing and later high-conformal gearing is to increase the power density transmitted through a gear pair. Two different ways to increase the power density through a gear pair are recognized. First, the power density through a gear pair can be increased by means of an increased rotation of the driving member. Second, the power density through a gear pair can be increased by means of an increased torque applied to the driving member. Conformal gearing, and Novikov gearing in particular, can be construed as a reduced case of involute gearing that features a zero length, Zpa, of the path of contact, (Pc). High-conformal gears feature convex-to-concave contacts of the tooth flanks of the gear and the pinion similar to those Novikov gearing features.
