Rotating body, turbocharger, and rotating body manufacturing method

Patent metadata

Field	Value
Publication number	US-11530706-B2
Application number	US-201916545277-A
Country	US
Kind code	B2
Filing date	Aug 20, 2019
Priority date	Mar 22, 2017
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

Provided is a rotating body, including: a shaft; and a compressor impeller including: a main body having an insertion hole, which extends from one end to another end side and is configured to receive the shaft inserted therethrough; a boss portion formed at one end side of the main body; and a joint portion, which is formed on an inner peripheral surface of the insertion hole at the boss portion and is welded to the shaft.

First claim

What is claimed is:

1. A rotating body, comprising:
a shaft; and
a compressor impeller including:
a main body having an insertion hole, the insertion hole extending from a first end of the main body to a second end of the main body and being configured to receive the shaft inserted therethrough;
a boss portion formed at a first end side of the main body; and
a joint portion which is formed on an inner peripheral surface of the insertion hole at the boss portion, and is welded to the shaft

wherein the insertion hole includes:
a smaller-inner-diameter portion formed on a second end side with respect to the boss portion, and
a radially expanded portion, which is located between the smaller-inner-diameter portion and the joint portion, and has an inner diameter larger than an inner diameter of the smaller-inner-diameter portion,
the radially expanded portion is located inside the boss portion.

2. The rotating body according to claim 1 , wherein the compressor impeller includes:
blades which are provided at a second end side with respect to the boss portion on an outer periphery of the main body; and
an extending portion, which is located between the blades and the boss portion and has a thickness in a radial direction larger than that of the boss portion.

3. The rotating body according to claim 2 , wherein the shaft includes:
a small-diameter portion welded to the joint portion;
a large-diameter portion which is formed on the second end side with respect to the small-diameter portion, and has a diameter larger than that of the small-diameter portion; and
a step portion extending from the small-diameter portion to the large-diameter portion.

4. The rotating body according to claim 3 , wherein the boss portion is divided into a plurality of segments in a circumferential direction.

5. The rotating body according to claim 2 , wherein the boss portion is divided into a plurality of segments in a circumferential direction.

6. The rotating body according to claim 1 , wherein the shaft includes:
a small-diameter portion welded to the joint portion;
a large-diameter portion which is formed on a second end side with respect to the small-diameter portion, and has a diameter larger than that of the small-diameter portion; and
a step portion extending from the small-diameter portion to the large-diameter portion.

7. The rotating body according to claim 6 , wherein the boss portion is divided into a plurality of segments in a circumferential direction.

8. The rotating body according to claim 1 , wherein the boss portion is divided into a plurality of segments in a circumferential direction.

9. A turbocharger, comprising the rotating body of claim 1 .

10. The rotating body according to claim 1 , wherein the shaft is free of a nut for fastening the compressor impeller to the shaft.

11. A manufacturing method for a rotating body, comprising:
inserting a shaft through an insertion hole extending from a first end to a second end of a main body of a compressor impeller; and
joining a boss portion, which is formed at the first end of the main body, and the shaft by electromagnetic forming,
wherein the insertion hole includes:
a smaller-inner-diameter portion formed on a second end side with respect to the boss portion, and
a radially expanded portion, which is located between the smaller-inner-diameter portion and the joint portion, and has an inner diameter larger than an inner diameter of the smaller-inner-diameter portion,
the radially expanded portion is located inside the boss portion.

12. The method according to claim 11 , wherein the shaft is free of a nut for fastening the compressor impeller to the shaft.

Assignees

• Ihi Corp

Inventors

• Segawa Kenichi
• Narimatsu Akitada

Classifications

• F05D2230/232

  by welding · CPC title

• F05D2260/98

  Lubrication · CPC title

• B23P15/006

  turbine wheels · CPC title

• F01D5/025

  Fixing blade carrying members on shafts (attachment of a member on a shaft in general F16D1/06; for non-positive displacement pumps F04D29/00) · CPC title

• F05D2220/40

  in turbochargers · CPC title