Patent ID: 8485605

Claim:
A gear assembly comprising: first and second gear wheels, a plurality of teeth on the first gear wheel configured to mesh with a plurality of teeth on the second gear wheel, and having a meshing line, the meshing line defining a trajectory of contacting points of meshing teeth of the first and second gear wheels, wherein the meshing line is formed as a combined line that is positioned between a first addendum circle, of the first gear wheel, and a second addendum circle, of the second gear wheel, to determine a circumferential angular meshing range of the meshing line, so as to extend from a point on the first addendum circle positioned radially inside the second addendum circle in a circumferential direction in which the second addendum circle is gradually radially outwardly spaced from the first addendum circle and to reach a point on the second addendum circle, and wherein the combined line is composed of a combination of a plurality of line portions, one of the plurality of line portions intersecting the first addendum circle and another of the plurality line portions intersecting the second addendum circle.