Turbocharging device for an internal combustion engine

A turbocharging device for an internal combustion engine, said turbocharging device comprising:

• an exhaust gas manifold configured to receive exhaust gas from an internal combustion engine;
• a first charge air distributor configured to distribute charge air to the internal combustion engine;
• a first pair of exhaust gas turbochargers comprising first and second exhaust gas turbochargers each having a turbine and a compressor, wherein said turbines of said exhaust gas turbochargers of said first pair are connected in parallel to said exhaust gas manifold and wherein said compressors of said exhaust gas turbochargers of said first pair are connected serially to said first charge air distributor;
• a second pair of exhaust gas turbochargers comprising first and second exhaust gas turbochargers each having a turbine and a compressor, wherein said turbines of said exhaust gas turbochargers of said second pair are connected in parallel to said exhaust gas manifold and wherein said compressors of said exhaust gas turbochargers of said second pair are connected serially to said first charge air distributor;
• a first one of said exhaust gas turbochargers of said first pair being operated alone when the need for charge air is minimal and a second one of said exhaust gas turbochargers of said first pair being switched on when the need for charge air increases, wherein an air volume of said second exhaust gas turbocharger of said first pair is greater than an air volume of said first exhaust gas turbocharger of said first pair, wherein an air volume of said second exhaust gas turbocharger of said second pair is greater than an air volume of said first exhaust gas turbocharger of said second pair;
• said compressor of said first exhaust gas turbocharger of said first pair is positioned, relative to the fluid flow, between said compressor of said second exhaust gas turbocharger of said first pair and said first charge air distributor;
• said compressor of said first exhaust gas turbocharger of said second pair is positioned, relative to the fluid flow, between said compressor of said second exhaust gas turbocharger of said second pair and said first charge air distributor;
• said change air distributor having a charge air separation flap configured to divide in a closed position an interior of said charge air distributor into a first interior portion and a second interior portion, wherein said compressor of said first exhaust gas turbocharger of said second pair is connected to said second interior portion of said charge air distributor.