Turbocharger and manufacturing method for turbocharger

摘要

A turbocharger includes: a turbine wheel that is driven by exhaust gas from an engine and supported rotatably by a predetermined rotary shaft; and a turbine housing that forms an exhaust gas passage that leads the exhaust gas to the turbine wheel, wherein the turbine housing includes a housing main body constituted by a plate-form member and a reinforcement member that forms the exhaust gas passage together with the housing main body and reinforces the housing main body, the reinforcement member includes a pair of annular portions having a substantially annular shape and provided about an axial center of the rotary shaft at an interval in an axial direction of the rotary shaft, and a connecting portion that connects the pair of annular portions, and the pair of annular portions and the connecting portion are molded integrally by implementing deformation processing on the plate-form member.

主权项

1. A manufacturing method for a turbocharger, wherein the turbocharger includes a turbine wheel that is driven by exhaust gas from an engine and supported rotatably by a predetermined rotary shaft, and a turbine housing that forms an exhaust gas passage that leads the exhaust gas to the turbine wheel, and wherein the turbine housing includes a housing main body constituted by a thin plate material and a reinforcement member that forms the exhaust gas passage together with the housing main body and reinforces the housing main body, the manufacturing method comprising:
molding the reinforcement member integrally by implementing deformation processing on a plate-form member to obtain a component that includes a pair of annular portions having a substantially annular shape so as to form ring-shaped plate-form parts formed such that a plate surface thereof is perpendicular to the turbo axis direction and being provided about an axial center of the rotary shaft at an interval in an axial direction of the rotary shaft, and a connecting portion that connects the pair of annular portions, punching the connecting portion to form a pair of exhaust gas passage holes in a single punching step, by punching the connecting portion from a diametrical direction inner side to a diametrical direction outer side of the rotary shaft, wherein the exhaust gas passage eholes lead the exhaust gas to the diametrical direction inner side of the rotary shaft, wherein an outer peripheral side part of the exhaust gas passage holes are in a substantially tapered form that widens toward an outer peripheral side, wherein the exhaust gas passage holes are elongated holes having a circumferential direction of the annular portion as a lengthwise direction, and are provided in the circumferential direction of the annular portion in opposing positions relative to the diametrical direction of the rotary shaft.