Patent ID: 8397503
Filing Date: 2013-03-19
Classification: B60K,F02B,Y02T

Abstract:
1. A turbocharged engine for a vehicle, comprising: a small-sized turbocharger provided on a one-side face of an engine body, a turbine of which is connected to an outlet of an exhaust manifold; a large-sized turbocharger provided on the one-side face of the engine body, a turbine of which is connected to an outlet of the turbine of said small-sized turbocharger; and an exhaust-gas purification device provided on the one-side face of the engine body and connected to an outlet of the turbine of said large-sized turbocharger, wherein said small-sized turbocharger is arranged near one side of a crank-shaft direction at said one-side face of the engine body, said large-sized turbocharger is positioned right above said small-sized turbocharger such that the large-sized turbocharger and the small-sized turbocharger are arranged up and down, overlapping with each other in the crank-shaft direction, and the outlet of the turbine of the large-sized turbocharger faces toward the other side of said crank-shaft direction, an upstream-side exhaust pipe connected to the outlet of the exhaust manifold bifurcates vertically into an upward-extending upper bifurcate portion and a downward-extending lower bifurcate portion, the upward-extending upper bifurcate portion being connected to an inlet of the turbine of the large-sized turbocharger so as to introduce exhaust gas from the engine body to the large-sized turbocharger, bypassing the turbine of the small-sized turbocharger, the downward-extending lower bifurcate portion being connected to an inlet of the turbine of the small-sized turbocharger so as to introduce the exhaust gas from the engine body to the small-sized turbocharger, said exhaust-gas purification device is arranged beside the large-sized turbocharger and the small-sized turbocharger on the other side of the crank-shaft direction, which is opposite to said one side of the crank-shaft direction, and extends vertically such that an inlet thereof is located at an upper position and an outlet thereof is located at a lower position, and the inlet of the exhaust-gas purification device is connected to the outlet of the turbine of the large-sized turbocharger and the outlet of the exhaust-gas purification device is connected to an exhaust pipe.