Patent ID: 6502397
Filing Date: 2003-01-07
Classification: F02M

Abstract:
A device for the transfer of exhaust gas from the exhaust collector (3) of a supercharged internal combustion engine to the inlet conduit (4) thereof, comprising a supercharge unit (5) with a turbine (6) connected to the exhaust collector, the wheel of which turbine being rotatable by means of flowing exhaust gasses from the exhaust collector and drivingly connected with an impeller of a compressor (7) provided in the inlet conduit (4), which compressor (7) is connected to on one hand an external inlet conduit (12) part for sucking in air from outside by means of the impeller, and on the other hand to said inlet conduit (4) for feeding of pressurized charging air to the engine (1), and a transfer conduit (13) extending between the exhaust collector (3) and the inlet conduit (4) for, when necessary, transferring exhaust gasses from the exhaust collector to the inlet conduit in and for mixing with the charging air before the latter is fed to the engine, a venturi device (16, 16â€²) being provided in the inlet conduit (4), of the type that comprises a canal (18) that is delimited by on one hand a waist-like section (19) with a smallest cross-sectional area, and on the other hand two sections with a tapering shape, viz. a converging inlet section (20) located upstream of the waist section and a diverging outlet section (21) functioning as a diffusor located downstream of the same, and the transfer conduit (13) ending upstream of the waist section in the canal, so that exhaust gasses from the exhaust collector be sucked into the pressurized charging air in the inlet conduit (4) by the venturi effect, characterized in that an injector tube (23, 23â€²) connected to the transfer conduit (13) is provided in the inlet section (20) of the canal (18), said injector tube having a free, open end which, together with the surrounding canal wall, delimits a ring-shaped passage (25) for the charging air, and in that the injector tube (23, 23â€²) and the venturi device (16, 16â€²) are axially movable relative to each other.