Turbocharger and manufacturing method for turbocharger

Patent metadata

Field	Value
Publication number	US-9222367-B2
Application number	US-201013144178-A
Country	US
Kind code	B2
Filing date	Jan 14, 2010
Priority date	Jan 15, 2009
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

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.

First claim

The invention claimed is:

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.

2. The manufacturing method according to claim 1 , wherein cold forging, in which residual compressive stress or residual tensile stress is applied to at least the connecting portion part of the reinforcement member in the axial direction of the rotary shaft in order to counteract an external force acting on the reinforcement member in the axial direction of the rotary shaft, is performed as the deformation processing.

3. The manufacturing method according to claim 1 , wherein
a first annular portion positioned on an outlet side of the exhaust gas led to the turbine wheel with respect to the axial direction of the rotary shaft and a second annular portion positioned further toward the outer side of the diametrical direction of the rotary shaft than the first annular portion and on an opposite side to the outlet side with respect to the axial direction of the rotary shaft are formed as the pair of annular portions,
the connecting portion is formed as a part that includes a cylindrical portion constituted by a cylindrical part having an axial center direction of the rotary shaft as a cylinder axis direction, one side of which in the cylinder axis direction is continuous with an inner peripheral side of the second annular portion, and an R-shaped portion constituted by a bent part extending continuously from another side of the cylindrical portion in the cylinder axis direction toward an outer peripheral side of the first annular portion, and
the exhaust gas passage hole is provided in a plurality in the cylindrical portion.

4. The manufacturing method according to claim 1 , further comprising:
providing a hole in a position of the first annular portion, the position corresponding substantially to a center of the exhaust gas passage hole with respect to the circumferential direction of the annular portion.

5. The manufacturing method according to claim 1 , wherein the turbine housing is supported by a support member that is provided on an end portion of the outlet side of the exhaust gas led to the turbine wheel and includes a fastening support portion extending to the diametrical direction outer side of the rotary shaft and fastened to a main body side of the engine, the exhaust gas passage hole is provided in a plurality, the method further comprising:
providing the support member relative to column portions serving as parts disposed between adjacent exhaust gas passage holes in the circumferential direction of the annular portion such that with respect to a phase centering on the axial center of the rotary shaft, a phase of the fastening support portion is an intermediate phase between adjacent column portions in the circumferential direction of the annular portion.

6. The manufacturing method for a turbocharger according to claim 1 , wherein a material in which an absolute value of an Δr value indicating plastic anisotropy does not exceed 0.25 is used as the plate-form member constituting the reinforcement member.

Assignees

• Inoshita Hirofumi
• Mine Koichi
• Isogai Tomoyuki
• Iida Tatsuo
• Sato Akira
• Kajita Takuya
• Yoshikane Hideki
• Toyota Motor Co Ltd
• Aisin Takaoka Ltd

Inventors

• Inoshita Hirofumi
• Mine Koichi
• Isogai Tomoyuki
• Iida Tatsuo
• Sato Akira
• Kajita Takuya
• Yoshikane Hideki

Classifications

• F01D9/026

  Scrolls for radial machines or engines · CPC title

• Y10T29/49245

  Vane type or other rotary, e.g., fan · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F01D25/24 Primary

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• F05D2300/502

  Thermal properties · CPC title