Patent ID: 7047739
Filing Date: 2006-05-23
Classification: F01D,F01N,F02B,F05D,Y02T

Abstract:
1. An exhaust-gas turbocharger for an internal combustion engine, comprising a compressor ( 20 ) arranged in an induction tract and an exhaust-gas turbine ( 1 ) arranged in an exhaust-gas line of the engine, said exhaust-gas turbine ( 1 ) including a turbine housing ( 2 ) having a turbine wheel ( 3 ) and at least two spiral ducts ( 4 , 5 ) which, in each case, open into a radial flow inlet passage ( 6 , 7 ), via which exhaust gas can be fed to the turbine wheel ( 3 ) of the exhaustgas turbine ( 1 ), a radial guide cascade ring ( 10 ) being arranged in the radial flow inlet passages ( 6 , 7 ), and being adjustable in a variable manner, the exhaust-gas turbine ( 1 ) being a combination turbine having radial flow inlet passages ( 6 , 7 ) and semi-axial flow inlet passages ( 8 , 9 ), one of the semi-axial flow inlet passages ( 8 , 9 ) being assigned to each radial flow inlet passage ( 6 , 7 ), the radial guide cascade ring ( 10 ) having vanes disposed between two walls ( 15 , 16 ) which axially delimit the radial flow inlet passage ( 6 , 7 ), one wall ( 16 ) being axially displaceable and having axial openings ( 18 ) which receive the vanes of the guide cascade ring ( 10 ) or from which the vanes of the guide cascade ring ( 10 ) are removable during an axial movement of the wall ( 16 ), the one wall ( 16 ) being displaceable axially while the vanes of the guide cascade ring ( 10 ) are inserted into the axial openings ( 18 ) in the axially displaceable wall ( 16 ) until the radial flow inlet passage ( 6 , 7 ) are closed and also being movable outwardly to such an extent that the vanes of the radial guide cascade ring ( 10 ) are no longer in contact with the wall ( 16 ) and there is a direct, unobstructed flow path between the two spiral ducts ( 4 , 5 ) and an outflow duct ( 14 ) in the exhaust-gas turbine ( 1 ).