Crankshaft for a 90 degree V-type eight-cylinder internal combustion engine

摘要

A crankshaft for a 90 DEG V-type eight-cylinder internal combustion engine having eight balance weights of No. 1 through No. 8 balance weights and supported by five supports. An angle defined between the No. 1 and No. 2 balance weights is set at the range of 15 DEG -45 DEG and an angle defined between the No. 1 and No. 3 balance weights is set at the range of 45 DEG -75 DEG . The mass of each of No. 1 and No. 8 balance weights is greater than the weight of any one of No. 2 through No. 7 balance weights. These relationships can reduce the weight of a crankshaft and bearing loads.