Crankshaft for a V-6 internal combustion engine

摘要

A crankshaft of a V6 internal combustion engine which ensures a decrease of the engine vibration and surface pressure affecting each crank journal by achieving effectively dynamic balance of a whole crank shaft and dynamic balance couple between inner main bearings, comprises a first balance weight 31 associated with the first crank arm 21, a second balance weight 32 associated with the second crank arm 22, the center of gravity of the second balance weight being deviated from that of the first balance weight 31 in a counterclockwise direction; third and fourth balance weights 33, 34 associated with fourth and sixth crank arms 24, 26 and having centers of gravity deviated upward and downward and orthogonally in a clockwise direction with respect to that of the first balance weight, a fifth balance weight 35 associated with eighth crank arm 28, in vertical symmetry with the second balance weight 32, and a sixth balance weight 36 associated with the ninth crank arm 29, in vertical symmetry with the first balance weight. <IMAGE>