Patent ID: 8720421

Claim:
A turbo-charging apparatus for a vehicle engine, comprising: a first turbocharger; a second turbocharger configured to receive exhaust gas from a turbine of the first turbocharger; an inter-turbine passage connecting in an exhaust flow direction a discharging port of the turbine of the first turbocharger with an introducing port of a turbine of the second turbocharger, wherein the inter-turbine passage is configured to allow exhaust gas discharged from the discharging port of the turbine of the first turbocharger to flow to the introducing port of the turbine of the second turbocharger; a bypass passage connecting an introducing passage of the turbine of the first turbocharger with the inter-turbine passage, wherein the introducing passage connects to an exhaust manifold of the engine and can introduce exhaust gas to the introducing port of the turbine of the second turbocharger and wherein the bypass passage allows exhaust gas to bypass the turbine of the first turbocharger; and a control valve for opening and closing the bypass passage; wherein a turbine shaft of the first turbocharger and a turbine shaft of the second turbocharger are arranged substantially in parallel to each other; wherein the inter-turbine passage extends substantially straight from the discharging port of the turbine of the first turbocharger toward the second turbocharger when viewed from a direction parallel to the turbine shafts of the first and second turbochargers so that the inter-turbine passage connects with an outer circumferential part of the turbine of the second turbocharger so as to extend in a direction tangent to an outer circumference direction of the turbine of the second turbocharger; and wherein the inter-turbine passage and the bypass passage are arranged to be juxtaposed so as to be mutually overlapping each other when viewed from a direction perpendicular to the turbine shafts of the first and second turbochargers and formed integrally with each other.