Turbocharger for an internal combustion engine

• US 20040040300A1
• Filed: 09/02/2003
• Published: 03/04/2004
• Est. Priority Date: 08/30/2002
• Status: Abandoned Application

• Current Assignee: BorgWarner Incorporated
• Original Assignee: BorgWarner Incorporated
• Inventors: Klingel, Dieter
• Application Number:
  US10/653,440
• Publication Number:
  US 20040040300A1
• Time in Patent Office: Days
• US Class Current: 60/612
• CPC Class Codes: F02B 37/004 with exhaust drives arranged in series
• CPC Class Codes: F02B 37/013 with exhaust-driven pumps arranged in series
• CPC Class Codes: F02B 37/16 by bypassing charging air
• CPC Class Codes: F02B 37/162 by bypassing, e.g. partially, intake air from pump inlet to pump outlet
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 39/00 Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F05D 2240/40 Use of a multiplicity of similar components
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

The invention concerns a turbocharger for an internal combustion engine, which is at least two-stage, wherein each respective stage of the turbocharger system is respectively a turbine and respectively a compressor, which via a common shaft are coupled with each other, wherein at least the exhaust gas side parts of the exhaust gas turbocharger are integrated in a common housing unit. The invention further concerns an internal combustion engine with such a compressor system.

Claims

1. Turbocharger for an internal combustion engine, which is at least two-staged, wherein each respective stage (11, 12) of the compressor system (10) respectively comprises one turbine (13, 16) and respectively one compressor (14, 17), which are connected with each other via a common shaft (15, 18), wherein at least the exhaust gas parts (13, 16) of the exhaust gas turbocharger (10) are integrated into (a) a common housing unit (19, 191) or (b) two housing units which are connected with each other in space saving manner.

2. Turbocharger according to claim 1, wherein at least said two turbines (13, 16) are integrated in a common housing (19).

3. Turbocharger according to one of the preceding claims, wherein at least one high-pressure stage (11) and at least one low-pressure stage (12) are provided, wherein the low-pressure (12) is provided downstream and the high-pressure stage (11) is provided upstream with respect to the direction of flow of the exhaust gas.

4. Turbocharger according to claim 3, wherein the high-pressure stage (11) includes at least one high-pressure turbine (13) in the flow of the exhaust gas and at least one high-pressure compressor (14) in the flow of the charge air, which are connected to each other via a first common shaft (15) provided between these two, and that the low-pressure stage (12) includes at least one low-pressure turbine (16) in the flow of the exhaust gas and at least one low-pressure compressor (17) provided in the flow of the charge air, which are coupled to each other via a second common shaft (18) provided between them.

5. Turbocharger according to one of the preceding claims, wherein an exhaust outlet of the high-pressure turbine (13) is connected with an inlet of the low-pressure turbine (16) via a common channel within the common housing (19) without interposition of piping.

6. Turbocharger according to one of the preceding claims, wherein the high-pressure stage (11) and the low-pressure stage (12) are integrated in a common housing (19′

).

7. Turbocharger according to one of the preceding claims, wherein at least one turbine (13, 16) of the turbocharger (10) is single volute.

8. Turbocharger according to one of the preceding claims, wherein at least one turbine (13, 16), in particular the high-pressure turbine (13) is two or more volute.

9. Turbocharger according to one of the preceding claims, wherein the common housing (19, 19′

) is cast iron.

10. Turbocharger according to one of the preceding claims, wherein a pipe connecting line (24) is provided, via which the charge air outlet of the low-pressure compressor (17) is connected with the charge air inlet of the high-pressure compressor (14), preferably via a flange.

11. Turbocharger according to one of the preceding claims, wherein the diameter of the turbine wheel of the high-pressure turbine (13) is smaller than the diameter of the turbine wheel of the low-pressure turbine (16).

12. Turbocharger according to one of the preceding claims, wherein the common housing (19, 19′

) is comprised of at least first and second parts, wherein the first part houses the first turbine (13) and the second part houses the second turbine (16) and wherein the outlet of the first turbine (13) is directly connected with the inlet of the second turbine (16).

13. Turbocharger according to claim 12, wherein the connection between the first part and the second part of the two turbines (13, 16) is via a flange.

14. Turbocharger according to claim 13, wherein the connection is comprised of an elongated neck of the common housing unit (19, 19′

).

15. Turbocharger according to claim 14, wherein in the common housing unit (19, 19′

), in particular in the elongated neck, at least one flap valve and/or slide valve is provided for controlling a bypass mass flow of the exhaust gas.

16. Turbocharger according to one of the preceding claims, wherein the two turbines (13, 16) are provided connected to each other in compact manner.

17. Internal combustion engine (1), with

an engine block, which includes at least one cylinder (2) and which includes at least one charge air inlet (7) and at least one exhaust gas outlet (8), and

a turbocharger (10) according to one of the preceding claims, which includes at least two stages (11, 12).

18. Internal combustion engine according to claim 17, wherein the charger (16) is a turbocharger (10).

19. Internal combustion engine according to one of claims 17 or 18, wherein the internal combustion engine (1) is an Otto-motor or a diesel engine.