VARIABLE GEOMETRY SYSTEM TURBOCHARGER AND METHOD OF MANUFACTURING HOUSING FOR VARIABLE GEOMETRY SYSTEM TURBOCHARGER

摘要

A reservoir groove for storing condensate water is formed on a lower part side of a link chamber inside a turbine housing. The reservoir groove is formed such that, assuming that water vapor contained in an exhaust gas retained inside the link chamber is completely condensed and liquefied after an engine stops its operation, a height position of a reference water surface of the condensate water stored in a reservoir area, which includes a space inside the reservoir groove in the link chamber, is lower than a height position of a lowermost part of the link mechanism.

主权项

1. A variable geometry system turbocharger configured to supercharge air to be supplied to an engine by using pressure energy of an exhaust gas from the engine, comprising:
a housing including a link chamber formed on one side in an axial direction of a turbine impeller, and rotatably housing the turbine impeller; and a variable nozzle unit being disposed inside the housing, and being capable of changing a passage area for the exhaust gas to be supplied to the turbine impeller, wherein the variable nozzle unit includes
a base ring provided inside the housing concentrically with the turbine impeller, and having a plurality of support holes formed to penetrate the base ring and arranged in its circumferential direction,a plurality of variable nozzles disposed on the base ring and arranged in its circumferential direction in such a way as to surround the turbine impeller, each variable nozzle
being rotatable about a shaft center which is parallel to a shaft center of the turbine impeller, andhaving a nozzle shaft formed integrally with a side surface of the variable nozzle on one side in the axial direction of the turbine impeller, and rotatably supported by the corresponding support hole in the base ring, anda link mechanism disposed in the link chamber, connected to the nozzle shafts of the plurality of variable nozzles, and configured to synchronously rotate the plurality of variable nozzles, the link chamber includes
an inner surface forming the link chamber,a reservoir recess formed by cutting the inner wall on a lower part side of the link chamber, anda reservoir area including a space inside the reservoir recess and designed to store condensate water on the lower part side of the link chamber, and the reservoir recess is formed such that, assuming that water vapor contained in the exhaust gas retained inside the link chamber is completely condensed and liquefied after the engine stops its operation, a height position of a reference water surface of the condensate water stored in the reservoir area is lower than a height position of a lowermost part of the link mechanism.