Muffler for an exhaust system

Abstract

The present invention relates to a muffler for an exhaust system of an internal combustion engine, including a housing having at least one absorption chamber which is filled with an absorbent material that has an absorbent effect for airborne sound, a straight-through pipe that carries exhaust gas during operation of the muffler and passes through the housing, and at least one blind pipe that is connected at one end laterally to the straight-through pipe and is sealed at the other end. The blind pipe has a wall that is acoustically transmissive for airborne sound in an area running in the absorption chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The FIGURE shows a simplified schematic longitudinal section through a muffler.

Claims

1. A muffler for an exhaust system of an internal combustion engine, comprising: a housing containing at least one absorption chamber which is filled with an absorbent material having an absorbent effect for airborne sound;a straight-through pipe carrying exhaust gas during operation of the muffler, said straight-through pipe passing through said housing; andat least one blind pipe connected at a first end laterally to said straight-through pipe, said at least one blind pipe being closed at a second end;

2. The muffler according to claim 1, wherein said straight-through pipe passes through said housing without interruptions apart from a connection point through which said blind pipe is connected to said straight-through pipe.

3. The muffler according to claim 2, wherein said straight-through pipe further comprises a wall that is not acoustically transmissive for airborne sound.

4. The muffler according to claim 1, wherein said straight-through pipe passes through said absorption chamber.

5. The muffler according to claim 1, wherein said straight-through pipe further comprises: a first linear inlet section leading into said housing;a second linear outlet section leading out of said housing; anda curved section connecting said first linear inlet section with said second linear outlet section.

6. The muffler according to claim 1, wherein said blind pipe is connected to said straight-through pipe in the area of said curved section.

7. The muffler according to claim 1, wherein said blind pipe further comprises a linear end section that is closed at one end; anda curved connecting section connecting said linear end section to said straight-through pipe.

8. The muffler according to claim 7, wherein said end section comprises a wall that is acoustically transmissive for airborne sound.

9. The muffler according to claim 7, wherein said outlet section of said straight-through pipe and said end section of said blind pipe extend essentially parallel to one another in said housing.

10. The muffler according to claim 1, wherein said housing comprises at least one intermediate bottom that subdivides said absorption chamber into first and second partial chambers.

11. The muffler according to claim 10, wherein said intermediate bottom is acoustically transmissive for airborne sound.

12. The muffler according to claim 10, wherein said straight-through pipe passes through said intermediate bottom and is supported on said intermediate bottom.

13. The muffler according to claim 10, wherein said blind pipe passes through said intermediate bottom and is supported on said intermediate bottom.

14. The muffler according to claim 1, wherein said straight-through pipe has essentially a constant flow cross section at least inside said housing and apart from the connection point through which said blind pipe is connected to said straight-through pipe.

15. The muffler according to claim 1, wherein said blind pipe has essentially a constant cross section.

16. The muffler according to claim 1, wherein said blind pipe further comprises a conical end piece.

17. The muffler according to claim 1, wherein said absorption chamber fills up the interior of said housing.

18. The muffler according to claims 1, wherein said muffler comprises a rear muffler.

19. The muffler according to claim 1, wherein said straight-through pipe forms an end pipe of the exhaust system downstream from said housing.

20. An exhaust system for an internal combustion engine, having at least one muffler according claim 1.