Turbo compressor system for internal combustion engine comprising two serially placed turbo units with their rotation axes essentially concentric

A turbocharger system for an internal combustion engine (10) having at least one exhaust line (15,16) for evacuating exhaust gases from the combustion chamber (11) of the engine and at least one inlet line (12) for supplying air to said combustion chamber, said turbo-charging system comprising a high-pressure turbine (17) which interacts with a high-pressure compressor (19) forming a high-pressure turbo unit (18) with a common rotation axis (31) and a low-pressure turbine (21) which interacts with a low-pressure compressor (23) forming a low-pressure turbo unit (22) with a common rotation axis (32) for extracting energy from the exhaust flow of the engine and pressurizing the inlet air of the engine, said low-pressure turbine (21) is of the axial type and the high-pressure turbo unit (18) and the low-pressure turbo unit (22) are serially placed with the rotation axes (31, 32) essentially concentric and with the high-pressure turbine (17) and the low-pressure turbine (21) placed adjacent to each other and coupled together by an intermediate piece (20) configured as a flow duct arranged to allow a certain eccentricity between the two rotation axes, and the low-pressure turbo unit (22) is attached to one part of the internal combustion engine (10) and the high-pressure turbo unit (18) is attached to another part of the engine (10).