Variable geometry system turbocharger

A variable geometry system turbocharger comprising:

• a variable nozzle unit disposed between a turbine scroll passage and a turbine wheel in a turbine housing adjacent to a bearing housing, the variable nozzle unit being configured to adjust a passage area for exhaust gas to be supplied to the turbine wheel, and
• a support ring including an outer peripheral edge sandwiched between the bearing housing and the turbine housing, configured to support the variable nozzle unit,
• wherein the variable nozzle unit includes:
• a first nozzle ring disposed in the turbine housing, including an inner peripheral surface facing radially inward;
• a second nozzle ring opposed to the first nozzle ring in an axial direction;
• a plurality of variable nozzles disposed at intervals in a circumferential direction between the first nozzle ring and the second nozzle ring, and rotatably provided around nozzle axes thereof parallel to the axial direction;
• a link configured to rotate the plurality of variable nozzles synchronously;
• an annular heat shield plate provided between the bearing housing and the turbine wheel, configured to shield heat from a turbine wheel side of the turbine housing toward the bearing housing, the annular heat shield plate including an outer peripheral surface facing radially outward and opposed to the inner peripheral surface of the first nozzle ring;
• and
• a first seal member provided between the inner peripheral surface of the first nozzle ring and the outer peripheral surface of the heat shield plate.