Exhaust-gas turbocharger

Abstract

The invention relates to an exhaust-gas turbocharger ( 1 ) having a turbine ( 2 ) which has the following parts: a turbine wheel ( 3 ); a turbine housing ( 4 ) in which is arranged at least one turbine channel ( 5, 5′ ) which has a passage opening ( 6, 6′ ) arranged upstream of the turbine wheel ( 3 ) as viewed in the exhaust-gas flow direction; and a shut-off device ( 7 ), which is arranged downstream of the turbine channel ( 5, 5′ ) and upstream of the turbine wheel ( 3 ), for opening and closing the passage opening ( 6, 6′ ), wherein the shut-off device ( 7 ) has a shut-off sleeve ( 12 ) which is guided in a translatorially movable fashion in a groove ( 13 ) formed directly into the turbine housing ( 4 ).

1 . An exhaust-gas turbocharger ( 1 ) having a turbine ( 2 ) which has the following parts:
 a turbine wheel ( 3 );   a turbine housing ( 4 ) in which is arranged at least one turbine channel ( 5 ,  5 ′) which has a passage opening ( 6 ,  6 ′) arranged upstream of the turbine wheel ( 3 ) as viewed in the exhaust-gas flow direction; and   a shut-off device ( 7 ), which is arranged downstream of the turbine channel ( 5 ,  5 ′) and upstream of the turbine wheel ( 3 ), for opening and closing the passage opening ( 6 ,  6 ′),   wherein the shut-off device ( 7 ) has a shut-off sleeve ( 12 ) which is guided in a translatorially movable fashion in a groove ( 13 ) formed directly into the turbine housing ( 4 ).   
     
     
         2 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein the shut-off sleeve ( 12 ) has at least one web ( 14 ) whose free end ( 16 ) is connected to an actuating device. 
     
     
         3 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein the shut-off sleeve ( 12 ) has preferably two webs ( 14 ,  15 ) which are arranged approximately diametrically opposite one another and whose free ends ( 16   17 ) are connected to an actuating device. 
     
     
         4 . The exhaust-gas turbocharger as claimed in  claim 2 , wherein the shut-off sleeve ( 12 ) is connected to the actuating device via a lever arrangement ( 18 ) and a fork ( 19 ) which is fastened to the free ends ( 16 ,  17 ) of the webs ( 14 ,  15 ). 
     
     
         5 . The exhaust-gas turbocharger as claimed in  claim 2 , wherein the groove ( 13 ) has a number of housing apertures ( 21 ) in the direction of the turbine outlet (A) corresponding to the number of webs ( 14 ,  15 ). 
     
     
         6 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein the turbine housing ( 4 ) has two turbine channels ( 5 ,  5 ′) which are arranged adjacent to one another and separate from one another and which have associated passage openings ( 6 ,  6 ′). 
     
     
         7 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein the turbine channels ( 5 ,  5 ′) of the turbine housing ( 4 ) are of different sizes.