초록 ▼

An exhaust gas turbocharger for an internal-combustion engine, whose exhaust gas turbine has a rotor disk with at least one semiaxial and one radial flow inlet cross-section, and is provided with a variable turbine geometry for the variable adjustment of at least one flow inlet cross-section. Furthe

An exhaust gas turbocharger for an internal-combustion engine, whose exhaust gas turbine has a rotor disk with at least one semiaxial and one radial flow inlet cross-section, and is provided with a variable turbine geometry for the variable adjustment of at least one flow inlet cross-section. Furthermore, a compressor is provided in the intake system of the internal-combustion engine. In order to improve the efficiency of the exhaust gas turbocharger in a wide operating range, the ratio of the compressor outlet diameter to the average turbine inlet diameter can be variably adjusted according to the adjustment of the variable turbine geometry between a minimal value and a maximal value, the minimal value being lower than 1.1.

대표청구항 ▼

[ What is claimed is:] [1.]1. An exhaust gas turbocharger for an internal-combustion engine whose exhaust gas turbine has a rotor disk with at least one semiaxial and one radial flow inlet cross-section and is equipped with a variable turbine geometry for the variable adjustment of at least one flow

[ What is claimed is:] [1.]1. An exhaust gas turbocharger for an internal-combustion engine whose exhaust gas turbine has a rotor disk with at least one semiaxial and one radial flow inlet cross-section and is equipped with a variable turbine geometry for the variable adjustment of at least one flow inlet cross-section, and having a compressor in the intake system of the internal-combustion engine, the ratio (D.sub.v /D.sub.T,m) of the compressor outlet diameter (D.sub.v) to the average turbine inlet diameter (D.sub.T,m) according to the adjustment of the variable turbine geometry being variably adjustable between a minimal value and a maximal value,wherein the minimal value is lower than 1.1 and the average turbine inlet diameter (D.sub.T,m) is calculated according to the equationD.sub.T,x is the semiaxial turbine inlet diameterD.sub.T,r is the radial turbine inlet diameterA.sub.T,r is the area of the radial flow inlet cross-sectionA.sub.T,x is the area of the semiaxial flow inlet cross-section,and wherein the ratio of the semiaxial flow inlet cross-section area to the radial flow inlet cross-section area when the semiaxial and radial flow paths are fully open amounts to approximately 0.1.