Patent ID: 7905210

Claim:
An engine vibration elimination system that eliminates, by means of a balancer system, vibration of an engine in which a direction of vibration generated accompanying reciprocation of a piston is inclined relative to a cylinder axis, wherein the engine is a variable stroke characteristic engine in which at least one of top dead center and bottom dead center can be varied, the engine comprising: an upper link connected to the piston; a lower link connected to the upper link and a crankshaft; a control link connected at one of opposite ends thereof to the lower link and supported displaceably on an engine block at the opposite end via a control shaft; and an actuator for driving the control shaft, wherein said control shaft and said control link are positioned at one of opposite sides of the cylinder axis and downwardly of an upper end of said crankshaft, and wherein the balancer system is positioned downwardly of a lower end of said crankshaft and the balancer system generates an excitation force having a direction which is set such that the excitation force, when facing downwardly, is directed toward the one side of the cylinder axis and, when facing upwardly, directed toward the other side of the cylinder axis.