Control device for an exhaust gas-conducting section of an exhaust turbocharger

1. A control device for an exhaust gas-conducting section of an exhaust turbocharger,

wherein the exhaust gas-conducting section ( 3 ) through which a flow can pass comprises at least one duct ( 4 ; 5 ; 53 ) through which a flow can pass and which comprises a through-flow opening ( 7 ; 52 ) which, with the aid of a closure element ( 8 ) of the control device ( 2 ), can be fully or at least partially blocked or released, and

wherein the control device ( 2 ) comprises an actuator ( 10 ) for moving the closure element ( 8 ), and

wherein the closure element ( 8 ) is designed as a poppet valve,

wherein the closure element ( 8 ) can be moved at least into a first position in order to release the through-flow opening ( 7 ; 52 ) and into a second position in order to block the through-flow opening ( 7 ; 52 ), and

wherein the closure element ( 8 ) can be disposed at least in one of the positions in a wall of the exhaust gas-conducting section ( 3 ), and

wherein the closure element ( 8 ) comprises a closure body ( 11 ) closing or releasing the through-flow opening ( 7 ; 52 ), which closure body comprises an annular section surface ( 19 ) on its bottom surface ( 20 ) which faces the through-flow opening ( 7 ; 52 ), which section surface is designed to correspond to an element seat ( 14 ; 15 ; 65 ) formed in the wall, and

wherein the closure element has a top surface ( 21 ) which faces away from the bottom surface ( 20 ) and is designed in a profiled manner in order to produce the top surface ( 21 ) at least partially corresponding to another element seat ( 15 ; 14 ) and to achieve flow-optimized circulation,

wherein the element seats ( 14 , 15 ) and the section surface ( 19 ) as well as the top surface ( 21 ) comprise a conical or frustoconical contour, and

wherein in order to cool the closure element ( 8 ) a cooling element ( 22 ) is formed at least partially surrounding the closure element ( 8 ).

2. The control device as claimed in claim 1 ,

wherein the exhaust gas-conducting section ( 3 ) through which a flow can pass comprises the duct ( 4 ; 5 ) in form of a first flow ( 4 ) through which a flow can pass and/or a second flow ( 5 ) through which a flow can pass, which, with the aid of a flow-separating wall ( 6 ), can have fluid flowing through them separately from each other, and

wherein the closure element ( 8 ) can fully or at least partially block or release the through-flow opening ( 7 ) formed in the flow-separating wall ( 6 ), and

wherein the closure element ( 8 ) can be disposed in its first position for release of the through-flow opening ( 7 ) in the wall ( 18 ) formed opposite to the flow-separating wall ( 6 ), and can be disposed in a second position for blocking the through-flow opening in the flow-separating wall ( 6 ).

3. The control device as claimed in claim 1 ,

wherein a shaft ( 12 ) of the closure element ( 8 ) can be cooled.

4. The control device as claimed in claim 3 ,

wherein the cooling element ( 22 ) surrounds the shaft ( 12 ).

5. The control device as claimed in claim 1 ,

wherein the cooling element ( 22 ) is designed as cooling ribs ( 23 ) or as a water jacket.

6. The control device as claimed in claim 1 ,

wherein a coupling element ( 26 ) is provided for connecting the closure element ( 8 ) to an actuator push rod ( 25 ) of the actuator ( 10 ).

7. The control device as claimed in claim 1 ,

wherein the actuator ( 10 ) is designed to initiate movement of the closure element ( 8 ) coaxially to a longitudinal axis ( 13 ) thereof.

8. The control device as claimed in claim 1 ,

wherein the through-flow opening ( 7 ) is closed with the aid of a spring force acting on the closure element ( 8 ).

9. The control device as claimed in claim 8 ,

wherein the spring force can be formed with the aid of a tensioning element ( 41 ) received in the actuator ( 10 ).

10. The control device as claimed in claim 1 ,

wherein, in order to guide the closure element ( 8 ), a housing ( 9 ) comprises a holding element ( 38 ) protruding into an actuator housing ( 36 ).

11. The control device as claimed in claim 10 ,

wherein the holding element ( 38 ) comprises a compensation duct ( 46 ).