Exhaust gas turbochanger for an internal combustion engine

Claim 1

An exhaust gas turbocharger for an internal combustion engine, comprising a compressor having an impeller and a turbine having a turbine wheel and being mounted on opposite sides of a turbine housing, said impeller and said turbine wheel being mounted on a common shaft rotatably supported in said turbine housing, said exhaust gas turbine having a housing with radial and semi-axial flow passages having annular nozzles leading to said turbine wheel and being separated by a flow guide ring, an annular sleeve mounted in said turbine housing so as to be slideable therein along the axis of said turbine wheel so as to extend across and block at least one of said flow passages for controlling the exhaust gas flow through said at least one flow passage, a guide blade ring disposed at an end face of said annular sleeve adjacent said flow guide ring such that the guide blades of said guide blade ring are normally disposed in said one flow passage for guiding the exhaust gas onto said turbine wheel, said flow guide ring having an axially extending annular recess structure receiving said guide blade ring when said annular sleeve is in a nozzle closing position.