Patent ID: 7513114

Claim:
An exhaust gas turbocharger for a reciprocating internal combustion engine including a plurality of cylinders with a displacement volume V H and an inlet line ( 6 ), and with an exhaust line ( 4 a , 4 b ), said exhaust gas turbocharger ( 2 ), having an exhaust gas turbine ( 3 ) with a turbine rotor ( 10 ) in the exhaust line ( 4 ) and a compressor ( 5 ) with a compressor wheel ( 21 ) in the inlet line ( 6 ), the exhaust gas turbine ( 3 ) having at least first and second exhaust gas inlet flow passages ( 7 , 8 ), by way of which exhaust gas is to be fed to the turbine rotor ( 10 ), the ratio D T /D V of the turbine rotor diameter D T to the compressor wheel diameter D V being governed by the relationship D T /D V >J K* Asy, wherein J denotes a constant in the range between 1 and 1.05. K denotes a parameter which varies as function of the swept volume V H of the internal combustion engine ( 1 ), which is to be determined according to the relationship K =0.15√{square root over ( V H /14)}≈0.04√{square root over ( V H )} as a function of the displacement volume V H measured in liters, and Asy denotes a turbine-specific degree of asymmetry, which is to be determined according to the relationship Asy=Φ 1,S /Φ 2,S as a function of the critical flow rate parameter Φ 1,S in the area of the choke limit for the first exhaust gas flow passage ( 7 ) of the exhaust gas turbine ( 3 ) and the corresponding flow rate parameter Φ 2,S for the second exhaust gas flow passage ( 8 ) of the exhaust gas turbine ( 3 ).