Heat shield with centering features

Patent metadata

Field	Value
Publication number	US-9988977-B2
Application number	US-201514870643-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Oct 14, 2014
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

A turbocharger ( 10 ) includes a shaft ( 26 ) rotatably supported within a bearing housing ( 28 ), a turbine wheel ( 22 ) connected to the shaft ( 26 ), and a heat shield ( 150, 250 ) disposed between the turbine wheel ( 22 ) and the bearing housing ( 28 ). The heat shield ( 150, 250 ) includes surface features ( 80, 180 ) formed on at least one of a sidewall ( 57 ) portion thereof and a flange ( 63 ) portion thereof that locate the heat shield ( 150, 250 ) relative to the bearing housing ( 28 ) such that the heat shield ( 150, 250 ) is coaxial with the rotational axis of the shaft ( 26 ).

First claim

What is claimed is:

1. A turbocharger ( 10 ) comprising
a bearing housing ( 28 ),
a shaft ( 26 ) rotatably supported within the bearing housing ( 28 ),
a turbine housing ( 14 ) connected to the bearing housing ( 28 ),
a turbine wheel ( 22 ) disposed in the turbine housing ( 14 ) and connected to the shaft ( 26 ), and
a heat shield ( 150 ) including
a radially extending base ( 51 ) having a central opening ( 52 ) that receives the shaft ( 26 ),
a radially extending flange ( 63 ) that is axially offset from the radially extending base ( 51 ), and
a sidewall ( 57 ) extending between the base ( 51 ) and the flange ( 63 ), the sidewall ( 57 ) having
a first end ( 58 ) connected to a radially-outermost end of the base ( 51 ), and

a second end ( 59 ) that is opposed to the first end ( 58 ) and connected to a radially-innermost end ( 65 ) of the flange ( 63 ),

wherein the heat shield ( 150 ) includes surface features ( 80 ) formed on the flange ( 63 ) that locate the heat shield ( 150 ) relative to the bearing housing ( 28 ), the surface features ( 80 ) comprising an axially protruding ridge ( 82 ) that is formed in the flange ( 63 ), the ridge ( 82 ) being received within a circumferential groove ( 23 ) formed in the bearing housing ( 28 ) whereby the heat shield ( 150 ) is located relative to the bearing housing ( 28 ) such that the heat shield ( 150 , 250 ) is co-axial with the rotational axis of the shaft ( 26 ).

2. The turbocharger ( 10 ) of claim 1 , wherein the axially protruding ridge ( 82 ) is convex on a bearing housing-facing surface ( 66 ) of the flange ( 63 ), and concave on a turbine housing-facing surface ( 67 ) of the flange ( 63 ).

3. The turbocharger ( 10 ) of claim 1 , wherein the ridge ( 82 ) is continuous in a circumferential direction.

4. The turbocharger ( 10 ) of claim 1 , wherein the ridge ( 82 ) is formed at a location of the flange ( 63 ) that adjoins the sidewall ( 57 ).

5. The turbocharger ( 10 ) of claim 1 , wherein the bearing housing ( 28 ) includes a nose ( 29 ) on the turbine housing-facing surface ( 28 a ) of the bearing housing ( 28 ), axially protruding towards the turbine housing ( 14 ) and centered on a shaft-receiving bore ( 30 ), and wherein a radial clearance is provided between the central opening ( 52 ) of the heat shield ( 150 ) and the bearing housing nose ( 29 ).

6. A turbocharger ( 10 ) comprising
a bearing housing ( 28 ),
a shaft ( 26 ) rotatably supported within the bearing housing ( 28 ),
a turbine housing ( 14 ) connected to the bearing housing ( 28 ),
a turbine wheel ( 22 ) disposed in the turbine housing ( 14 ) and connected to the shaft ( 26 ), and
a heat shield ( 250 ) including
a radially extending base ( 51 ) having a central opening ( 52 ) that receives the shaft ( 26 ),
a radially extending flange ( 63 ) that is axially offset from the radially extending base ( 51 ), and
a sidewall ( 57 ) extending between the base ( 51 ) and the flange ( 63 ), the sidewall ( 57 ) having
a first end ( 58 ) connected to a radially-outermost end of the base ( 51 ), and

a second end ( 59 ) that is opposed to the first end ( 58 ) and connected to a radially-innermost end ( 65 ) of the flange ( 63 ),

wherein the heat shield ( 250 ) includes surface features ( 180 ) formed on the sidewall ( 57 ) that locate the heat shield ( 250 ) relative to the bearing housing ( 28 ), the surface features ( 180 ) including radially inward-extending protrusions ( 182 , 282 ) that are spaced along a circumference of the sidewall ( 57 ), a radially inward-facing surface ( 60 a ) of the protrusions ( 182 , 282 ) abutting a radially outward-facing surface ( 28 b ) of the bearing housing ( 28 ), whereby the heat shield ( 250 ) is located relative to the bearing housing ( 28 ) such that the heat shield ( 150 , 250 ) is co-axial with the rotational axis of the shaft ( 26 ).

7. The turbocharger ( 10 ) of claim 6 , wherein a ratio (Ls/Lp) of a circumferential dimension (Ls) of the sidewall ( 57 ) to a circumferential dimension (Lp) of the protrusion ( 182 ) is in a range of 20 to 100.

8. The turbocharger ( 10 ) of claim 6 , wherein the heat shield ( 250 ) includes three protrusions ( 182 , 282 ).

9. The turbocharger ( 10 ) of claim 6 , wherein a dimension (Lp) of the protrusion ( 182 , 282 ) in a circumferential direction is less than 10% of a circumferential dimension (Ls) of the sidewall ( 57 ) without protrusion.

10. The turbocharger ( 10 ) of claim 6 , wherein the bearing housing ( 28 ) includes a nose ( 29 ) on the turbine housing-facing surface ( 28 a ) of the bearing housing ( 28 ), axially protruding towards the turbine housing ( 14 ) and centered on a shaft-receiving bore ( 30 ), and wherein a radial clearance is provided between the central opening ( 52 ) of the heat shield ( 250 ) and the bearing housing nose ( 29 ).

Assignees

• Borgwarner Inc

Inventors

• Crandall Jerud
• Jenks Gordon
• Thayer Michael

Classifications

• F05D2300/6033

  Ceramic matrix composites [CMC] · CPC title

• F01D25/186

  for sliding contact bearing · CPC title

• F01D5/046

  Heating, heat insulation or cooling means · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F02B39/14 Primary

  Lubrication of pumps; Safety measures therefor · CPC title