Mounting structure and turbocharger

Patent metadata

Field	Value
Publication number	US-10753367-B2
Application number	US-201815988793-A
Country	US
Kind code	B2
Filing date	May 24, 2018
Priority date	Dec 1, 2015
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Provided is a mounting structure, including: an impeller including: a main body portion having a through hole; a plurality of blades provided to an outer peripheral surface of the main body portion; and a boss portion, which is a part of the main body portion, and protrudes toward one end side of the shaft with respect to the plurality of blades; a small-diameter portion, which is a part of the shaft; a first large-diameter portion, which is a part of the shaft, is located on another end side of the shaft with respect to the small-diameter portion; and a small-inner-diameter portion of the through hole, which is formed on a radially inner side of the boss portion, and has an inner diameter smaller than an inner diameter of a part of the through hole which is opposed to the first large-diameter portion in a radial direction.

First claim

What is claimed is:

1. A mounting structure, comprising:
an impeller including:
a main body portion having a through hole to which a shaft is inserted;
a plurality of blades provided to an outer peripheral surface of the main body portion; and
a boss portion, which is a part of the main body portion, and protrudes toward one end side of the shaft with respect to the plurality of blades;

a small-diameter portion, which is a part of the shaft, and is opposed to an inner peripheral surface of the through hole and spaced apart in the radial direction of the shaft;
a first large-diameter portion, which is a part of the shaft, is located on another end side of the shaft with respect to the small-diameter portion, and has a first outer diameter larger than an outer diameter of the small-diameter portion;
a second large-diameter portion of the shaft, which is located on one end side of the shaft with respect to the small-diameter portion, has a second outer diameter larger than the outer diameter of the small-diameter portion, and is located on a radially inner side of the boss portion;
a small-inner-diameter portion of the through hole, which is formed on a radially inner side of the boss portion, and has an inner diameter smaller than an inner diameter of a part of the through hole which is opposed to the first large-diameter portion in a radial direction; and
a step surface of the through hole, which is located on a radially outer side of the second large-diameter portion, which is opposed to the second large-diameter portion in the radial direction.

2. The mounting structure according to claim 1 , wherein the second large-diameter portion extends longer in the axial direction of the shaft than the first large-diameter portion.

3. The mounting structure according to claim 1 , wherein the through hole and the first large-diameter portion are fitted to each other by interference fitting, and the through hole and the second large-diameter portion are fitted to each other by intermediate fitting.

4. The mounting structure according to claim 2 , wherein the through hole and the first large-diameter portion are fitted to each other by interference fitting, and the through hole and the second large-diameter portion are fitted to each other by intermediate fitting.

5. The mounting structure according to claim 1 , further comprising a third large-diameter portion of the shaft, which is located between the first large-diameter portion and the second large-diameter portion, and has a third outer diameter larger than the outer diameter of the small-diameter portion.

6. The mounting structure according to claim 2 , further comprising a third large-diameter portion of the shaft, which is located between the first large-diameter portion and the second large-diameter portion, and has a third outer diameter larger than the outer diameter of the small-diameter portion.

7. The mounting structure according to claim 3 , further comprising a third large-diameter portion of the shaft, which is located between the first large-diameter portion and the second large-diameter portion, and has a third outer diameter larger than the outer diameter of the small-diameter portion.

8. The mounting structure according to claim 4 , further comprising a third large-diameter portion of the shaft, which is located between the first large-diameter portion and the second large-diameter portion, and has a third outer diameter larger than the outer diameter of the small-diameter portion.

9. The mounting structure according to claim 1 ,
wherein a back surface portion of the main body portion, which is located on another end side of the shaft with respect to the plurality of blades, is inclined in such an orientation that an outer diameter of the back surface portion of the main body portion decreases toward the another end side of the shaft, and
wherein the first large-diameter portion is located on a radially inner side of the back surface portion.

10. The mounting structure according to claim 2 ,
wherein a back surface portion of the main body portion, which is located on another end side of the shaft with respect to the plurality of blades, is inclined in such an orientation that an outer diameter of the back surface portion of the main body portion decreases toward the another end side of the shaft, and
wherein the first large-diameter portion is located on a radially inner side of the back surface portion.

11. The mounting structure according to claim 3 ,
wherein a back surface portion of the main body portion, which is located on another end side of the shaft with respect to the plurality of blades, is inclined in such an orientation that an outer diameter of the back surface portion of the main body portion decreases toward the another end side of the shaft, and
wherein the first large-diameter portion is located on a radially inner side of the back surface portion.

12. The mounting structure according to claim 4 ,
wherein a back surface portion of the main body portion, which is located on another end side of the shaft with respect to the plurality of blades, is inclined in such an orientation that an outer diameter of the back surface portion of the main body portion decreases toward the another end side of the shaft, and
wherein the first large-diameter portion is located on a radially inner side of the back surface portion.

13. The mounting structure according to claim 1 , wherein the small-diameter portion is located on a radially inner side of a radially outermost portion of the main body portion which extends to an outermost side in the radial direction of the shaft.

14. The mounting structure according to claim 2 , wherein the small-diameter portion is located on a radially inner side of a radially outermost portion of the main body portion which extends to an outermost side in the radial direction of the shaft.

15. The mounting structure according to claim 3 , wherein the small-diameter portion is located on a radially inner side of a radially outermost portion of the main body portion which extends to an outermost side in the radial direction of the shaft.

16. The mounting structure according to claim 4 , wherein the small-diameter portion is located on a radially inner side of a radially outermost portion of the main body portion which extends to an outermost side in the radial direction of the shaft.

17. A turbocharger, comprising the mounting structure according to claim 1 .

Assignees

• Ihi Corp

Inventors

• Uneura Yutaka
• BUNNO Kenji
• Daito Yuichi
• Kaneda Shinichi
• Segawa Kenichi
• Tezuka Atsushi

Classifications

• F02B39/00 Primary

  Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 · CPC title

• F04D29/266 Primary

  mounting compressor rotors on shafts · 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

• F05D2230/64

  using positioning or alignment devices for aligning or centring, e.g. pins · CPC title

• F05D2260/30

  Retaining components in desired mutual position · CPC title