Patent ID: 7360362
Filing Date: 2008-04-22
Classification: F01N,F02B,Y02T

Abstract:
1. A two-stage turbocharger system for an internal combustion engine, comprising: a high-pressure turbocharger comprising a high-pressure turbine housing defining an exhaust gas inlet and an exhaust gas outlet commonly located at one end of the high-pressure turbine housing; a low-pressure turbocharger comprising a low-pressure turbine housing defining an exhaust gas inlet at one end of the low-pressure turbine housing; an exhaust manifold formed separately from the high-pressure and low-pressure turbine housings and structured and arranged to be coupled to an engine to receive exhaust gas from the engine, the exhaust manifold having a first end and an opposite second end, and defining an inter-turbine passage having an inlet and an outlet and further defining a bypass passage having a first end and an opposite second end, and a bypass valve mounted in the exhaust manifold, the bypass valve being movable between a closed position closing the bypass passage and an open position opening the bypass passage, the inlet of the inter-turbine passage and the first end of the bypass passage being commonly located at the first end of the exhaust manifold, the outlet of the inter-turbine passage and the second end of the bypass passage being commonly located at the second end of the exhaust manifold; the one end of the high-pressure turbine housing being releasably connected by a single joint to the first end of the exhaust manifold such that the exhaust gas outlet of the high-pressure turbine housing is connected to the inlet of the inter-turbine passage and the exhaust gas inlet of the high-pressure turbine housing is connected to the first end of the bypass passage; and the one end of the low-pressure turbine housing being releasably connected by a single joint to the second end of the exhaust manifold such that the exhaust gas inlet of the low-pressure turbine housing is connected to the outlet of the inter-turbine passage and to the second end of the bypass passage.