Exhaust gas turbine of a turbocharger for an internal combustion engine
AssigneeDaimlerChrysler AG
InventorsHelmut Daudel, Wolfgang Erdmann, Peter Fledersbacher, Carsten Funke, Paul Löffler, Siegfried Sumser
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Abstract
An exhaust gas turbine portion of a vehicle engine turbocharger is provided with at least one variable guide-blade cascade with guide blades in a nozzle opening to the turbocharger rotor for effectively changing the cross section of the exhaust flow to the rotor wherein the angle of the guide blades is selectively settable by an adjusting device. The width dimension of the gap between the ends of the guide-blade cascade and the casing wall defining the nozzle is adjustable between a substantially zero gap dimension and a maximum gap dimension.
Claims24
In an turbocharger for an internal combustion engine having a housing defining an exhaust gas turbine portion including a rotor and defining a surrounding exhaust flow inlet duct with an annular nozzle opening therefrom to the rotor for directing exhaust gas flow to the rotor and having a guide-blade cascade of guide blades with their angular orientation relative to the flow direction through the nozzle opening being selectively settable by means of a guide-blade adjusting device for varying the effective flow cross-section of the nozzle opening, characterized by a gap setting device (14, 15, 16, 17) for selectively changing dimension of the gap at the ends of the guide-blade cascade (11) and the casing (10) between a substantially zero gap dimension and a maximum gap dimension.
In an turbocharger for an internal combustion engine having a housing defining an exhaust gas turbine portion including a rotor and defining a surrounding exhaust flow inlet duct with an annular nozzle opening therefrom to the rotor for directing exhaust gas flow to the rotor and having a guide-blade cascade of guide blades with their angular orientation relative to the flow direction through the nozzle opening being selectively settable by means of a guide-blade adjusting device for varying the effective flow cross-section of the nozzle opening, characterized by a gap setting device (14, 15, 16, 17) for selectively changing dimension of the gap at the ends of the guide-blade cascade (11) and the casing (10) between a substantially zero gap dimension and a maximum gap dimension.
A regulatory system for an exhaust gas turbine portion of an exhaust gas turbocharger for an internal combustion engine including a rotor and having a casing defining a surrounding exhaust flow inlet duct with an annular nozzle opening therefrom to the rotor for directing exhaust gas flow to the rotor and having a guide-blade cascade of guide blades with their angular orientation relative to the flow direction through the nozzle opening being selectively settable by means of a guide-blade cascade adjusting device for varying the effective flow cross-section of the nozzle opening, characterized in that a gap setting device (14, 15) is controlled by a pressure regulating device (19) for selectively providing a gap dimension between the gap setting device (14) and the ends of the guide-blade cascade (11) between a substantially zero dimension gap and a maximum dimension gap.
A turbocharger for an internal combustion engine having a housing defining an exhaust gas turbine portion including a rotor and defining a surrounding exhaust flow inlet duct with an annular nozzle opening leading from said inlet duct to the rotor for directing exhaust gas flow to the rotor, and a guide-blade structure disposed in said nozzle opening and having guide blades whose angular orientation relative to the flow direction through the nozzle opening is selectively settable by means of a guide-blade adjusting device connected to one axial end of said guide blade structure for varying the effective flow cross-section of the nozzle opening, a gap setting device disposed adjacent the other axial end of said guide blade structure for selectively changing the dimension of the axial gap between the other axial end of the guide-blade structure and the housing between a substantially zero gap dimension and a maximum gap dimension, said gap setting device including an annular piston reciprocally supported in the wall of said housing adjacent the other axial end of the guide-blade structure, said annular piston defining at its end opposite said guide blades a pressure space to which fluid under pressure can be selectively directed for controlling axial movement of the annular piston relative to the axial end of the guide blades of the guide-blade structure for adjusting any gap between the annular piston and the guide-blade structure.
Dependencies are inferred from the claim text.