Patent ID: 8191368

Claim:
A variable geometry turbine comprising: a turbine housing having an inlet and an outlet; a turbine wheel arranged for rotation about an axis in the housing between the inlet and outlet; the inlet comprising a substantially annular inlet passageway defined between a substantially radial face of a first wall and a facing second wall of the housing, the walls being movable relative to one another along the turbine axis to vary the size of the inlet passageway; a substantially annular array of vanes extending across the inlet passageway for directing exhaust gas flow towards the turbine wheel, each vane being fixed to one of the first and second walls, and a respective opening for receiving each vane being provided the other of the first and second walls to accommodate said relative movement of the walls; a chamber adjacent to the second wall, the second wall being disposed between the chamber and the first wall; a wastegate port at the chamber providing communication between the chamber and the outlet of the turbine housing; and a bypass path being provided from the inlet passageway to the chamber for exhaust gas to bypass the turbine wheel and to exit through the wastegate port.