Patent ID: 7950305

Claim:
A toothing system ( 1 ) of a gearwheel having a plurality of teeth ( 2 , 3 ; 19 ) whose tooth flanks ( 4 , 5 , 6 ; 22 ) have involute form above a tooth-root region ( 7 , 8 , 9 ; 23 ) of the tooth flanks ( 4 , 5 , 6 ; 22 ), wherein the tooth-root region ( 7 , 8 , 9 ; 23 ) of the tooth flanks ( 4 , 5 , 6 ; 22 ) that, as viewed in normal section, extends between a root useful point ( 15 , 16 , 17 ; 24 ) and a root point (F) has elliptical shape, tangentially adjoins the involute region of the tooth flank ( 4 , 5 , 6 ; 22 ) at the root useful point ( 15 , 16 , 17 ; 24 ) and tangentially contacts the root circle (FKS) at the root point (F), characterized in that, in its tooth-root region ( 7 , 8 , 9 ; 23 ), the tooth flank ( 4 , 5 , 6 ; 22 ), as viewed in a transverse cross-section, substantially follows a partial section (B) of an ellipse ( 10 , 11 , 12 ; E) whose semiaxes (a, b) have different lengths, one semiaxis (a, b) of the ellipse ( 10 , 11 , 12 ; E) being inclined at an ellipse tilting angle alpha larger than 0° and smaller than 90° relative to a radial (R) through the root point (F), and in that the tooth flanks ( 4 , 5 , 6 ; 22 ) of the teeth ( 2 , 3 ; 19 ) of the toothing are symmetric to one another across a symmetry plane (A) that divides the respective tooth ( 2 , 3 ; 19 ) in axial direction.