VIBRATION PREVENTION STRUCTURE IN ENGINE

摘要

In an engine in which at least two bearing portions which rotatably support at least a pair of crank journals provided to a crankshaft are mounted on a crankcase, both ends of the crankshaft are projected from the outermost bearing portions which are arranged along an axis of the crankshaft out of t he respective bearing portions, and a propeller is mounted on one end of the crankshaft, the vibrations on an end portion of the crankshaft opposite to t he propeller is effectively suppressed whereby it is possible to easily perform a change of the vibration suppression structure in conformity with the propert y of the propeller. A vibration suppressor which is provided with a pair of vibration pendulum type weights arranged outside the crankcase is mounted on the other end of the crankshaft.