Patent ID: 6957535

Claim:
A variable exhaust gas turbocharger ( 1 ) for an internal combustion engine ( 10 ), comprising an exhaust gas turbine ( 2 ) including a housing having a turbine inlet flow passage ( 2 . 3 ) with a variable flow cross-section, a turbine wheel ( 2 . 2 ), a charge air compressor ( 3 ) with a charge air compressor wheel ( 3 . 1 ) disposed in said housing, a shaft ( 1 . 2 ) rotatably supported in said housing and carrying both said turbine wheel ( 2 . 2 ) and said compressor wheel ( 3 . 1 ), means for conducting exhaust gas from said combustion engine ( 10 ) to said turbine wheel ( 22 ) for driving the turbine wheel ( 2 . 2 ) with a first torque, an additional device ( 6 ) disposed in communication with said exhaust gas turbocharger ( 1 ) for supplying a second torque to said exhaust gas turbocharger, said additional device ( 6 ) being a compressor with a charge air inlet ( 3 . 6 ) and a charge air outlet ( 3 . 3 ) in communication with the compressor inlet of the exhaust gas turbocharger for supplying a second torque to the compressor wheel ( 3 . 1 ) and the turbocharger shaft, said charge air outlet of said additional compressor ( 6 . 2 ) including a main flow duct branching into two separate ducts, one being connected to an additional axial inlet duct ( 3 . 4 ) of the charge air compressor ( 3 ) and the other extending to a radial inlet duct ( 3 . 3 a ) of said compressor, said additional device ( 6 ) being driven by one of a mechanical drive and an electric motor.