Variable geometry system turbocharger
AssigneeIHI Corporation
InventorsTakafumi UEDA, Akira IWAKAMI
Life of this patent
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Abstract
A variable geometry system turbocharger includes an annular heat shield plate which shields heat from a turbine wheel side. The heat shield plate is integrally provided at a central part of a side surface of a bearing housing opposed to a back surface of a turbine disk. A first seal ring is provided between an inner peripheral surface of a first nozzle ring and an outer peripheral surface of the heat shield plate. A second seal ring is provided between an inner peripheral surface of a second nozzle ring and an outer peripheral surface of a protrusion of a turbine housing.
Claims8
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 side,
- wherein the variable nozzle unit includes:
- a first nozzle ring disposed in the turbine housing;
- a second nozzle ring provided integrally with the first nozzle ring at a position away from and 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 configured to be rotatable in forward and reverse directions around shaft centers parallel to a shaft center of the turbine wheel;
- a link mechanism configured to rotate the plurality of variable nozzles synchronously in opening and closing directions;
- an annular heat shield plate provided at a side surface of the bearing housing opposed to aback surface of the turbine wheel, and configured to shield heat from the turbine wheel side;
- and
- a seal member provided between an inner peripheral surface of the first nozzle ring and an outer peripheral surface of the heat shield plate.
Dependencies are inferred from the claim text.