Abstract: A gear tooth including a concave base connected to its starting point at the root of the adjacent tooth and a top connected to the base via a first transition point. The top of the tooth includes two convex segments connected via a second transition point causing a curve break in the tooth profile.

Abstract: Machine for finishing gear wheel teeth by shaving or rolling by means of a toothed rotary tool adapted to operate in tight meshing engagement with the gear wheel for finishing the teeth thereof, which comprises means for supporting the tool along its axis of rotation, a motor for rotatably driving said tool, means for supporting said gear wheel along its axis of rotation, the two axes of rotation of the tool and gear wheel, respectively, having at least one common perpendicular, and motor means for generating between said tool support means and said gear wheel support means, three powered relative movements comprising a movement in a direction parallel to said common perpendicular and two movements transverse to each other in planes respectively perpendicular to said common perpendicular, the motor for rotatably driving said tool and the motors for producing said two transverse movements being responsive to synchronous programmable servo-control means.