Patent ID: 8764388

Claim:
A variable geometry turbine comprising: a turbine wheel supported in a housing for rotation about a turbine axis; an annular inlet passage defined between respective radial inlet surfaces of first and second wall members, at least one of said first and second wall members being moveable along the turbine axis to vary the size of the inlet passage; an array of vanes extending across the inlet passage, said vanes being connected to said first wall member; a complementary array of vane slots defined by the second wall member, said vane slots being configured to receive said vanes to accommodate relative movement between the first and second wall members; wherein the second wall member comprises at least two axially adjacent co-axial plates, a first of said plates defining a first array of openings which overlie a second array of openings defined by a second of said plates so as to define said array of vane slots, said first plate being fixed to said second plate; and wherein the second wall member comprises at least a third co-axial plate that is axially adjacent to said second plate, said third plate defining a third array of openings which overlie the second array of openings defined by the second plate so as to further define said array of vane slots.