Patent ID: 8475120

Claim:
An exhaust gas turbocharger for an internal combustion engine including a housing ( 14 ) and a rotor ( 18 ), the housing ( 14 ) having an exhaust gas inlet guide section ( 15 ) and an exhaust gas exhaust duct with a contour sleeve ( 32 ), the rotor ( 18 ) comprising a turbine wheel ( 20 ) and a shaft ( 21 ) connected to the turbine wheel ( 20 ) which is supported rotatably about an axis of rotation ( 22 ) in the exhaust gas guide section ( 15 ) so that the turbine wheel ( 20 ) is rotated by the exhaust gas, and a flow guide device ( 29 ) for controlling the exhaust gas flow to the turbine wheel ( 20 ) mounted in the exhaust gas inlet guide section ( 15 ), said flow guide device ( 29 ) comprising an annular guide vane structure ( 30 ) with guide vanes ( 36 ) for guiding the flow of exhaust gas to the turbine wheel ( 20 ) and an axial slide ( 31 ) movably supported on and extending around a turbine exhaust duct contour sleeve ( 32 ), and the annular guide vane structure ( 30 ) comprising a support ring ( 37 ′) on which the guide vanes ( 36 ) are mounted and which is also axially movably supported on the contour sleeve ( 32 ) surrounded by the axial slide ( 31 ), and a pre-tensioning device ( 41 ) disposed between the support ring ( 37 ′) and the contour sleeve ( 32 ) so as to bias the guide vanes ( 36 ) resiliently into contact with a housing wall ( 42 ) of the spiral channel ( 24 ), the axial slide ( 31 ) accommodating the guide vanes ( 36 ) to cover or uncover them upon movement of the axial slide ( 31 ) into or, respectively, out of the gas inlet guide section ( 15 ).