Patent ID: 6220031
Filing Date: 2001-04-24
Classification: F01D,F05D

Abstract:
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,m =D.sub.T,x +(D.sub.T,r -D.sub.T,x)*A.sub.T,r /(A.sub.T,r +A.sub.T,x)whereinD.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.