Patent ID: 8821112

Claim:
A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis; the housing defining an annular inlet passage disposed around an inducer portion of the turbine wheel and an outlet passage including a tubular wall disposed around an exducer portion of the turbine wheel; the inlet passage being defined between first and second radial inlet surfaces, one of said first and second inlet surfaces being defined by a moveable wall member and the other of said first and second inlet surfaces being defined by a facing wall of said housing, the moveable wall member being moveable relative to the facing wall of the housing along the turbine axis to vary the size of the inlet passageway; the moveable wall member being displaceably mounted within an annular cavity defined between said tubular wall and a surrounding wall of the housing; wherein the housing comprises an inlet portion defining said inlet passage and at least a portion of said surrounding wall and an outlet portion joined to said inlet portion and defining at least a portion of said outlet passage; wherein the tubular wall is integrally formed with said outlet portion of the housing; and wherein a generally radially extending annular wall portion integral with said tubular wall and said outlet portion of the housing extends between the two and closes an axial end of the cavity remote from said inlet passage.