Internal combustion engine with cooled turbine

Patent metadata

Field	Value
Publication number	US-9784127-B2
Application number	US-201514605567-A
Country	US
Kind code	B2
Filing date	Jan 26, 2015
Priority date	Jan 27, 2014
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

An internal combustion engine has a cylinder head with at least one cylinder and a cooled turbine. Each cylinder has at least one outlet opening adjoined by an exhaust line for discharging exhaust gases from the cylinder. The exhaust line issues into an inlet region transitioning into an exhaust gas-conducting flow duct of the turbine. The turbine has at least one rotor mounted on a rotatable shaft in a turbine housing. The turbine has at least one coolant duct which is integrated in the housing and which is delimited and formed by at least one wall of the housing to form a cooling arrangement. The at least one wall of the turbine housing that delimits the at least one coolant duct is provided, at least in regions, with a thermal insulation.

First claim

What is claimed is:

1. An internal combustion engine comprising:
at least one cylinder head having at least one cylinder, each cylinder having at least one outlet opening for discharging exhaust gases from the cylinder and each outlet opening being adjoined by an exhaust line; and
a turbine having at least one rotor mounted on a rotatable shaft in a turbine housing, the turbine having, to form a cooling arrangement, at least one coolant duct integrated in the turbine housing being delimited and formed by at least one wall;
wherein the exhaust line of the at least one cylinder issues into an inlet region, which transitions into an exhaust gas-conducting flow duct, of the turbine;
wherein the exhaust gas-conducting flow duct is uninsulated such that introduction of heat into the turbine housing from exhaust gases in the exhaust gas-conducting flow duct is unrestricted; and
wherein the at least one wall that delimits the at least one coolant duct is provided, at least in regions, with thermal insulation such that the thermal insulation contacts coolant in the at least one coolant passage such that the introduction of heat from the housing into coolant is impeded.

2. The internal combustion engine as claimed in claim 1 , wherein more than 50% of the at least one wall is provided with thermal insulation.

3. The internal combustion engine as claimed in claim 1 , wherein more than 70% of the at least one wall is provided with thermal insulation.

4. The internal combustion engine as claimed in claim 1 , wherein more than 80% of the at least one wall is provided with thermal insulation.

5. The internal combustion engine as claimed in claim 1 , wherein an entirety of the at least one wall is provided with thermal insulation.

6. The internal combustion engine as claimed in claim 1 , wherein the thermal insulation comprises enamel.

7. The internal combustion engine as claimed in claim 1 , wherein the thermal insulation comprises ceramic.

8. The internal combustion engine as claimed in claim 1 , wherein the thermal insulation is formed as a coating by surface treatment.

9. The internal combustion engine as claimed in claim 1 , wherein the turbine is a radial turbine.

10. The internal combustion engine as claimed in claim 9 , wherein the at least one coolant duct, at least in sections, extends in a spiral form around the shaft in the housing.

11. The internal combustion engine as claimed in claim 9 , wherein the at least one coolant duct extends circumferentially around and at a distance from the flow duct over an angle α, where α≦45°.

12. The internal combustion engine as claimed in claim 11 , wherein α≦30°.

13. The internal combustion engine as claimed in claim 1 , wherein the turbine housing is a cast part into which the thermal insulation is introduced as a coating during post-processing.

14. The internal combustion engine as claimed in claim 1 , wherein each cylinder has two outlet openings for discharging the exhaust gases out of the cylinder.

15. The internal combustion engine as claimed in claim 1 , wherein the exhaust lines merge to form at least one overall exhaust line, thus forming at least one exhaust manifold, wherein said at least one overall exhaust line issues into the inlet region of the turbine.

16. The internal combustion engine as claimed in claim 1 , wherein the exhaust lines of the cylinders merge to form at least one overall exhaust line within the cylinder head, thus forming at least one integrated exhaust manifold, wherein said at least one overall exhaust line issues into the inlet region of the turbine.

17. An engine comprising:
a cylinder head defining an outlet opening for discharging exhaust gases to an exhaust line; and
a turbine having an inlet region and an uninsulated flow duct receiving exhaust gases from the exhaust line, the turbine having at least one rotor mounted on a rotatable shaft in a turbine housing, the turbine housing defining a cooling duct having a wall to contact coolant, the wall provided with thermal insulation.

18. An engine turbine comprising:
a housing forming an inlet region and an uninsulated flow duct configured to receive engine exhaust gases and introduce heat into the housing; and
a rotor mounted on a rotatable shaft within the flow duct;
wherein the housing defines a cooling duct therein, a thermal insulation provided on the cooling duct to contact coolant and to limit cooling of the turbine, the insulation having a lower thermal conductivity than the housing.

19. The engine turbine of claim 18 wherein the cooling duct extends in a spiral form around the shaft.

20. The engine of claim 17 wherein the cooling duct extends in a spiral form around the shaft.

Assignees

• Ford Global Tech Llc

Inventors

• Kuhlbach Kai Sebastian
• Verpoort Clemens Maria
• Mehring Jan
• Weber Carsten
• Quiring Stefan

Classifications

• F05D2300/5024

  Heat conductivity · CPC title

• F01D25/145 Primary

  Thermally insulated casings · CPC title

• F01D25/14

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

• F05D2220/40

  in turbochargers · CPC title

• F05D2230/21

  by casting · CPC title