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Dept. of Mechanical Engineering, Inha Technical College(Received January 2, 2012; Revised January 25, 2012; Accepted January 26, 2012)Abstract − Oval gears are typical kinds of non-circular gears and are widely used in flow meters. This paperpresents a tooth profile design of an oval gear according to the curvature of the pitch curve. The length of thepitch oval is divided by the number of teeth and the curvature of the divided points is obtained. The tooth profileis designed on the circle of the curvature as if it is the pitch circle of a gear. The teeth of the oval gear have thesame module and pressure angle, but the pitch circle of each tooth differs in size. Thus, the teeth on the dividedpoints of the pitch oval are different in shape. This type of oval gear will improve the meshing properties. Keywords − oval gears(), non-circular gears( ), pitch oval(), curvature(),tooth profile( )

Tooth Profile Design of an Oval Gear According to the Curvature of the Pitch Curve