Exhaust gas turbocharger for an internal combustion engine

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).