Patent ID: 7121788

Claim:
An exhaust gas turbocharger for an internal combustion engine, with a turbine adapted for receiving the engine exhaust gas flow, and with a turbine driven compressor for providing intake flow to the internal combustion engine, wherein the turbine ( 1 ) has a flow channel ( 3 ) with a radial flow entry section ( 3 a ) and a further flow entry section, wherein a flow ring ( 7 ) separates the flow entry cross-section ( 3 a ) and the further flow entry section and borders the flow entry cross-section ( 3 a ), wherein an adjustable ring of guide vanes ( 5 ) is provided in the radial flow entry cross-section ( 3 a ) for variably adjusting the flow entry cross-section ( 3 a ), wherein the flow ring ( 7 ) is axially displaceable in the housing of the exhaust gas turbine ( 1 ) between a position contacting the ring of guide vanes ( 5 ) and a position exposing a gap between the flow ring ( 7 ) and the ring of guide vanes ( 5 ), and wherein axial relief boreholes are provided in the flow ring ( 7 ) extending between the axial faces of the flow ring for trimming of forces acting on the flow ring ( 7 ) when lying against the radial ring of guide vanes ( 5 ) in such a manner, that as a result of the reduction in static pressure in the ring of guide vanes ( 5 ) the flow ring ( 7 ) experiences a resulting pressure in the direction of the radial ring of guide vanes ( 5 ).