| 摘要 |
PURPOSE: A crank shaft of an engine is provided to optimize output and noise/vibration property of the engine for a two-cylinder operating state and also minimize the deterioration of the noise/vibration property in a three-cylinder operating state. CONSTITUTION: A crank shaft of an engine comprises a first crank pin(5), a second crank pin(7), and a third crank pin(9). The crank pins are arranged on the same plane passing through a central axial line(C) of the crank shaft. Two of the crank pins are arranged opposite to the other one about the central axial line. |
