Turbocharger

The device has at least one turbine (2) on the exhaust side of the engine, whereby the turbine has a flow channel (13) with at least one radial flow cross-section (13a), a flow ring (7) restricting the flow cross-section and a variable grid (5) for varying the radial cross-section. A compensation ring (20) is provided that can be adjusted axially and in the direction of the variable grid.