Muffler

Patent metadata

Field	Value
Publication number	US-9638077-B2
Application number	US-201615219635-A
Country	US
Kind code	B2
Filing date	Jul 26, 2016
Priority date	Jun 4, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A muffler ( 1 ) for an exhaust system of a vehicle driven by an internal combustion engine, includes a gas-tight housing ( 2 ), a partition wall ( 31 ) inside the housing, an inlet pipe ( 51 ), a first outlet pipe ( 61 ), a switchable second outlet pipe ( 7 ) and a resonator pipe ( 8 ). The a partition wall ( 31 ) divides the housing's interior into a first volume ( 41 ) and a second separate volume ( 42 ). The inlet pipe and the first outlet pipe ( 61 ) and the second outlet pipe and the resonator pipe are in fluid communication with the first volume. The resonator pipe provides fluid communication between the first volume and the second volume. The second outlet pipe passes through the second volume. The second outlet pipe is surrounded, in a circumferential direction, by the resonator pipe in a section in which the second outlet pipe penetrates the partition wall.

First claim

What is claimed is:

1. A muffler for an exhaust system of a vehicle driven by an internal combustion engine, the muffler comprising:
a gas-tight housing;
a partition wall disposed inside said housing, the partition wall dividing the interior of the housing into a first volume and a second volume separate from the first volume;
an inlet pipe in fluid communication with the first volume;
a first outlet pipe in fluid communication with the first volume;
a switchable second outlet pipe in fluid communication with the first volume, the switchable second outlet pipe passing through the second volume, and the switchable second outlet pipe penetrating the partition wall; and
a resonator pipe providing fluid communication between the first volume and the second volume, wherein:
the switchable second outlet pipe is disposed inside the resonator pipe in a section where the switchable second outlet pipe penetrates the partition wall;
the resonator pipe has a first section at which the resonator pipe is located inside the first volume and at which the second outlet pipe is not present; and
the resonator pipe has a second section at which the resonator pipe accommodates the second outlet pipe.

2. A muffler according to claim 1 , wherein a port of the inlet pipe is disposed inside the resonator pipe.

3. A muffler according to claim 2 , wherein at least one of:
a wall of the resonator pipe is devoid of openings in a section at which the second outlet pipe is not present; and
a wall of the resonator pipe has openings in a section in a section at which the second outlet pipe is not present.

4. A muffler according to claim 1 , wherein a wall of the switchable second outlet pipe has openings in a section of the switchable second outlet pipe at which the resonator pipe surrounds the switchable second outlet pipe.

5. A muffler according to claim 1 , wherein an end of the resonator pipe is located inside the first volume and is connected to the switchable second outlet pipe in a gas-tight manner.

6. A muffler according to claim 1 , further comprising a flap disposed in the switchable second outlet pipe, inside or outside the housing, the flap being configured to selectively close the second outlet pipe.

7. A muffler according to claim 6 , further comprising an electric motor configured for selectively opening and closing the flap and configured for being coupled to a controller.

8. A muffler according to claim 6 , wherein the flap is biased, with a bias force, into a position for closing the switchable second outlet pipe, the bias force being such that the flap is opened against the bias force upon the pressure of the exhaust gas applied to the flap equaling a predetermined value.

9. A muffler according to claim 1 , wherein at least one of:
an outside wall of the first outlet pipe is connected to the partition wall in a gas-tight manner; and
an outside wall of the resonator pipe is connected to the partition wall in a gas tight manner.

10. A muffler according to claim 1 , further comprising radially extending supports disposed between an outside wall of the second outlet pipe and an inlet wall of the resonator pipe in a section at which the resonator pipe surrounds the second outlet pipe.

11. A muffler according to claim 1 , wherein an inlet pipe is aligned with the first outlet pipe or with the switchable second outlet pipe.

12. A muffler according to claim 1 , further comprising a second partition wall defining a third volume located inside the housing between the first volume and the second volume, the third volume accommodating sound proofing.

13. A muffler for an exhaust system of a vehicle driven by an internal combustion engine, the muffler comprising:
a gas-tight housing comprising a first volume and a second volume;
a partition wall disposed inside said housing, said first volume being separated from said second volume via said partition wall, said partition wall comprising a partition wall opening;
an inlet pipe in fluid communication with said first volume;
a first outlet pipe in fluid communication with said first volume;
a switchable second outlet pipe in fluid communication with said first volume, said switchable second outlet pipe extending through said second volume, and the switchable second outlet pipe extending through said partition wall opening; and
a resonator pipe providing fluid communication between said first volume and said second volume, wherein:
said switchable second outlet pipe is disposed inside said resonator pipe in a section where said switchable second outlet pipe extends through said partition wall opening;
said resonator pipe has a first section at which said resonator pipe is located inside said first volume, said first section being free of said second outlet pipe; and
said resonator pipe comprises a second section, at least a portion of second outlet pipe being arranged in said second section of said resonator pipe.

14. A muffler according to claim 13 , wherein a port of the inlet pipe is disposed inside the resonator pipe.

15. A muffler according to claim 14 , wherein at least one of:
a wall of the resonator pipe is devoid of openings in a section at which the second outlet pipe is not present; and
a wall of the resonator pipe has openings in a section in a section at which the second outlet pipe is not present.

16. A muffler according to claim 13 , wherein a wall of the switchable second outlet pipe has openings in a section of the switchable second outlet pipe at which the resonator pipe surrounds the switchable second outlet pipe.

17. A muffler for an exhaust system of a vehicle driven by an internal combustion engine, the muffler comprising:
a gas-tight housing comprising a first volume and a second volume;
a partition wall disposed inside said housing, said first volume being separated from said second volume via said partition wall, said partition wall comprising a partition wall opening;
an inlet pipe in fluid communication with said first volume;
a first outlet pipe in fluid communication with said first volume;
a switchable second outlet pipe in fluid communication with said first volume, said switchable second outlet pipe extending through said second volume, and the switchable second outlet pipe extending through said partition wall opening; and
a resonator pipe providing fluid communication between said first volume and said second volume, wherein:
said switchable second outlet pipe comprises a first switchable second outlet pipe end portion and a second switchable second outlet pipe end portion;
said resonator pipe has a first section and a second section, said first section being located inside said first volume;
said first switchable second outlet pipe end portion is located at a spaced location from said first section;
said second switchable second outlet pipe end portion is located a position outside of said housing; and
at least a portion of second switchable outlet pipe is arranged in said second section of said resonator pipe.

18. A muffler according to claim 17 , wherein a port of the inlet pipe is disposed inside the resonator pipe.

19. A muffler according to claim 18 , wherein at least one of:
a wall of the resonator pipe is devoid of openings in a section at which the second outlet pipe is not present; and
a wall of the resonator pipe has openings in a section in a section at which the second outlet pipe is not present.

20. A muffler according to claim 17 , wherein a wall of the switchable second outlet pipe has openings in

Assignees

• Eberspächer Exhaust Tech Gmbh & Co Kg

Inventors

• Hörr Micha

Classifications

• F01N2470/14

  Plurality of outlet tubes, e.g. in parallel or with different length · CPC title

• F01N1/163

  by means of valves · CPC title

• F01N1/166 Primary

  for changing the flow path through the silencer or for adjusting the dimensions of a chamber or a pipe (F01N1/165 takes precedence) · CPC title

• F01N2240/36

  an exhaust flap · CPC title

• F01N2470/18

  the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus · CPC title