| 摘要 |
A variable capacity turbo supercharger is disclosed, in which a nozzle of a turbine is a vaneless nozzle, a scroll chamber having a flow path having a circular or like sectional profile which can keep a swirling state is disposed sidewise of the nozzle, an exhaust gas inlet passage for introducing engine exhaust gas into the scroll chamber is provided with fixed swirling generation means for imparting to the exhaust gas passing through the scroll chamber a swirling whose rotational direction is such that the rotation of the gas moves away from the turbine rotor in the neighborhood of the outlet of the scroll chamber into the nozzle, and a pitch of the swirling is flexible in the direction of the flow path according to the change of the amount of the gas generated from the engine and the rotation velocity of turbine rotor so that the outside compression efficiency for the gas flow in the nozzle is variable as if the capacity of the turbine changed by itself.
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