Patent ID: 8739759

Claim:
A power transmission system, the power transmission system comprising: a first elliptical gear fixed to a crankshaft and having an eccentric rotational center at a predetermined distance from an ellipse center of the first elliptical gear; and a second elliptical gear having an eccentric rotational center at a predetermined distance from an ellipse center of the second elliptical gear, and engaging and rotating with the first elliptical gear, the second elliptical gear having the same size as the first elliptical gear, wherein the rotational centers are eccentrically positioned at the predetermined distances from the respective ellipse centers so that the first elliptical gear and the second elliptical gear are in contact with each other at a power transmission contact point where a first line, which connects the ellipse center of the first elliptical gear with the ellipse center of the second elliptical gear, and a second line, which connects the rotational center of the first elliptical gear with the rotational center of the second elliptical gear, cross each other.