Turbine assembly

A turbine assembly for a turbocharger, the turbine assembly comprising:

• a housing which defines a flow path between an inlet and an outlet, the housing extending around an axis, the housing comprising:
• first and second volutes which define a respective first and second flow passage, a circumferential outlet portion of each of the first and second volutes being defined by first and second tongues;
• a shroud;
• and
• a nozzle ring;
• wherein the nozzle ring defines a turbine wheel-receiving bore;
• and
• wherein the shroud and nozzle ring define an annular passage between the circumferential outlet portions and the turbine wheel-receiving bore, at least one of the nozzle ring and the shroud being axially displaceable relative to each other to vary a throat of the annular passage;
• wherein the nozzle ring comprises a plurality of vanes circumferentially distributed about the turbine wheel-receiving bore, each of the plurality of vanes comprising a leading edge and a trailing edge;
• wherein the plurality of vanes comprises a first vane and a second vane, the first vane being the vane having its leading edge disposed in closest proximity to a tip of the first tongue, the second vane being the vane having its leading edge disposed in closest proximity to a tip of the second tongue;
• the shroud comprising:
• a plate, the plate defining:
• a first vane aperture in which the first vane of the plurality of vanes is receivable;
• and
• a second vane aperture in which the second vane of the plurality of vanes is receivable;
• and
• the plate comprising first and second radially extending projections, the first projection being circumferentially aligned with at least a leading edge of the first vane aperture, the second projection being circumferentially aligned with at least a leading edge of the second vane aperture.

A turbine assembly for a turbocharger, the turbine assembly comprising:

• a housing which defines a flow path between an inlet and an outlet, the housing extending around an axis, the housing comprising:
• first and second volutes which define a respective first and second flow passage, a circumferential outlet portion of each of the first and second volutes being defined by first and second tongues;
• a shroud;
• and
• a nozzle ring;
• wherein the nozzle ring defines a turbine wheel-receiving bore;
• and
• wherein the shroud and nozzle ring define an annular passage between the circumferential outlet portions and the turbine wheel-receiving bore, the nozzle ring being axially displaceable relative to the shroud to vary a throat of the annular passage;
• wherein the first tongue is formed of two portions, a first portion forming part of the housing and a second portion forming part of the shroud, the two portions being aligned with one another;
• and
• wherein the second tongue is formed of two portions, a first portion forming part of the housing and a second portion forming part of the shroud, the two portions being aligned with one another.