Controlled exhaust-type supercharger turbine

A controlled exhaust driven turbo-supercharger for an engine having exhaust flow conduits for discharging exhaust flow streams from the engine and designed for an engine speed below the rated speed of the engine to be supercharged, comprising:

• a turbine having a rotor;
• a vaneless, exhaust stream guidance device having at least two separate, continuously open inlet flow conduits, each of which has an inlet and an outlet, the inlets of which are each connectable to a certain exhaust stream of the exhaust flow conduits of the engine, and at least one additional flow conduit having an inlet and an outlet disposed in parallel to said inlet flow conduits, the center of the cross-sectional area of which is at a shorter radial distance from the turbine axis than the centers of the cross-section areas of said inlet flow conduits, said outlets of said inlet flow conduits as well as of said additional flow conduit surrounding the whole circumference of said turbine rotor;
• and
• control means mounted on said vaneless guidance device positioned in front of said inlet of said additional flow conduits, said control means including valve means movable between a fully opened and closed position for connecting said additional flow conduit to at least certain of said exhaust flow streams, and means for moving said valve means into its fully opened position the more the turbine speed increases, thereby connecting said additional conduit with the exhaust streams supplying said continuously open inlet flow conduits so as to increase the flow cross section.