Patent 7699733 was granted and assigned to Tsubakimoto Chain on April, 2010 by the United States Patent and Trademark Office.
In a chain transmission, vibration reduction is improved by an elastic member, sandwiched between an inner hub of a sprocket and a toothed outer circumferential member, in combination with a sprocket tooth configuration in which two or three different tooth form pitch angles are arranged irregularly along the sprocket's pitch circle.