Exhaust-gas turbocharger

Patent metadata

Field	Value
Publication number	US-9816433-B2
Application number	US-201214115501-A
Country	US
Kind code	B2
Filing date	Apr 27, 2012
Priority date	May 10, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An exhaust-gas turbocharger ( 1 ) having a turbine ( 2 ); a compressor ( 3 ); and a bearing housing ( 4 ) which is arranged between the turbine ( 2 ) and the compressor ( 3 ) and a compressor-side flange ( 5 ) of which adjoins the compressor ( 3 ). A heat throttle ( 6, 6 ′) is arranged in the compressor-side flange ( 5 ) of the bearing housing ( 4 ).

First claim

The invention claimed is:

1. An exhaust-gas turbocharger ( 1 ) comprising
a turbine ( 2 );
a compressor ( 3 ); and
a bearing housing ( 4 ) which is arranged between the turbine ( 2 ) and the compressor ( 3 ) and includes a compressor-side flange ( 5 ) which adjoins the compressor ( 3 ), wherein
a thermal decoupling heat throttle ( 6 , 6 ′) is arranged in the compressor-side flange ( 5 ) of the bearing housing ( 4 ), which reduces the heat conducting path in the bearing housing to at most 3 mm at it's narrowest cross-section,
the heat throttle is an external groove ( 6 ) defined between a first groove wall in the bearing housing having a height and a second groove wall in the bearing housing having a height, wherein the height (H) of the groove is defined as the smallest height of the groove wall in the bearing housing, and
a ratio of height (H) to width (B) of the groove ( 6 ′) is >2.5.

2. The exhaust-gas turbocharger as claimed in claim 1 , wherein the external groove ( 6 ) is a 360° encircling groove.

3. The bearing housing as claimed in claim 1 , wherein the internal groove ( 6 ′) reduces the heat conducting path in the bearing housing to at most 2 mm at it's narrowest cross-section.

4. An exhaust-gas turbocharger ( 1 ) having
a turbine ( 2 );
a compressor ( 3 ); and
a bearing housing ( 4 ) which is arranged between the turbine ( 2 ) and the compressor ( 3 ) and includes a compressor-side flange ( 5 ) which adjoins the compressor ( 3 ), wherein
the bearing housing ( 4 ) defines a heat-conducting path between the bearing housing turbine end and the compressor-side flange ( 5 ), and
a thermal decoupling heat throttle ( 6 , 6 ′) is arranged in the compressor-side flange ( 5 ) of the bearing housing ( 4 ) wherein the thermal decoupling heat throttle is an internal groove ( 6 ′), and wherein the internal groove ( 6 ′) reduces the heat conducting path in the bearing housing to at most 3 mm at it's narrowest cross-section.

5. The exhaust-gas turbocharger as claimed in claim 4 , wherein the internal groove ( 6 ′) is a 360° encircling groove.

6. The exhaust-gas turbocharger as claimed in claim 4 , wherein a heat insulation element ( 7 , 8 ) is arranged in the internal groove ( 6 ′).

7. The exhaust-gas turbocharger as claimed in claim 6 , wherein the heat insulation element ( 8 ) completely fills the internal groove ( 6 ′).

8. The exhaust-gas turbocharger as claimed in claim 6 , wherein the heat insulation element ( 7 ; 8 ) is s a disk composed of heat-insulating material.

9. The exhaust-gas turbocharger as claimed in claim 8 , wherein the disk is a ceramic disk.

10. The bearing housing as claimed in claim 4 , wherein the internal groove ( 6 ′) reduces the heat conducting path in the bearing housing to at most 2 mm at it's narrowest cross-section.

11. A bearing housing ( 4 ) of an exhaust-gas turbocharger ( 1 ), having a compressor-side flange ( 5 ) and having a turbine end, the bearing housing ( 4 ) defining a heat-conducting path between the turbine end of the bearing housing and the compressor-side flange ( 5 ), wherein a thermal decoupling heat throttle is arranged in the compressor-side flange ( 5 ), wherein the heat throttle is an internal groove ( 6 ′), wherein the internal groove ( 6 ′) reduces the heat conducting path in the bearing housing to at most 3 mm at it's narrowest cross-section, wherein the groove has a height (H) and a width (B), and wherein a the ratio of height (H) to width (B) of the groove ( 6 ′) is >2.5.

12. The bearing housing as claimed in claim 11 , wherein the internal groove ( 6 ′) is a 360° encircling groove.

13. The bearing housing as claimed in claim 11 , wherein a heat insulation element ( 7 , 8 ) is arranged in the internal groove ( 6 ′).

14. The bearing housing as claimed in claim 13 , wherein the heat insulation element ( 8 ) completely fills the internal groove ( 6 ′).

15. The bearing housing as claimed in claim 13 , wherein the heat insulation element ( 7 ; 8 ) is a disk composed of heat-insulating material.

16. The bearing housing as claimed in claim 15 , wherein the disk is a ceramic disk.

17. The bearing housing as claimed in claim 11 , wherein the internal groove ( 6 ′) reduces the heat conducting path in the bearing housing to at most 2 mm at it's narrowest cross-section.

Assignees

• Hemer Josef-Hans
• Schmitt Uwe
• Schumnig Oliver
• Borgwarner Inc

Inventors

• Hemer Josef-Hans
• Schmitt Uwe
• Schumnig Oliver

Classifications

• F01D25/145

  Thermally insulated casings · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F05D2260/231

  Preventing heat transfer · CPC title

• F01D25/16

  Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) · CPC title

• F01D25/14

  Casings modified therefor (double casings F01D25/26) · CPC title