Patent ID: 8100098

Claim:
A multi-link engine comprising: an engine block body including at least one cylinder with a cylinder liner formed so that a bottom end position in the direction of a cylinder axis is not constant and at least part of the bottom end has different positions; 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 upper link having an upper link axis that forms an angle with the cylinder axis, as viewed along a crank axis direction of the crankshaft, such that the angle reaches a minimum angle when a crank angle of the engine is within a range where the bottom end of a piston skirt is positioned below a topmost part of the bottom end of the cylinder liner.