Patent ID: 8100097

Claim:
A multi-link engine comprising: an engine block body including at least one cylinder; a crankshaft including a crank pin; a piston operatively coupled to the crankshaft to reciprocally move inside the cylinder of the engine; an upper link rotatably connected to the piston by a piston pin; a lower link rotatably connected to the crank pin of the crankshaft and rotatably connected to the upper link by an upper link pin; and a control link rotatably connected at one end to the lower link by a control link pin and rotatably connected at another end to the engine block body by a control shaft, the crank pin of the crankshaft having a center arranged on an imaginary straight line joining centers of the upper link pin and the control link pin, an angle formed between the imaginary straight line and a horizontal axis that is perpendicular to a center axis of the cylinder and that passes through an axial center of a crank journal of the crankshaft being the same when the piston is at top dead center as when the piston is at bottom dead center.