Importance

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Abstract

In a gear pair in which a first gear and a second gear having a greater number of teeth than the first gear share a meshing line of teeth that mesh with each other, at least a part of the meshing line includes a region where a pressure angle is not constant, the pressure angle monotonously decreases in a section of the meshing line from a pitch point to an end point on a tooth-top side of the first gear, and a relative curvature of tooth profile curves of the first and second gears in the section of the meshing line from the pitch point to the end point on the tooth-top side of the first gear is smaller than or equal to a maximum value of the relative curvature in a section from the pitch point to an end point on a tooth-root side of the first gear.

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First Claim