| 摘要 |
PURPOSE:To unify the exhaust pressure of every cylinder by providing a plurality of independent exhaust passages which lead exhaust from an engine to the turbine portion of a turbosupercharger and at the same time, forming at the turbine portion a plurality of scrolls which correspond to respective independent exhaust passages. CONSTITUTION:In a 6-cylinder engine, the 1st and 2nd exhaust manifolds 13, 14 which are independent exhaust passages are provided corresponding to the 1st and 2nd cylinder groups which respectively consist of 3 cylinders and in which an exhaust stroke does not overlap. The lower stream portions of respective manifolds 13, 14 are connected to the turbine portion 6 of a turbosupercharger 7. In this case, the turbine portion 6 is formed so as to have two scroll portions 15, 16, which are respectively connected with respective exhaust manifolds 13, 14. Also, when A is the cross sectional area of an exhaust inflow portion, and R is the distance from the center of this cross sectional to the shaft center of the turbine portion 6, the A/R of the turbine portion 6 is set larger for the exhaust manifold 13 having a larger exhaust resistance than for the exhaust manifold 14 having a smaller exhaust resistance.
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