Muffler for an exhaust system and manufacturing method for same

Abstract

A muffler for an exhaust system of an internal combustion engine, in particular in a motor vehicle, with an exhaust pipe which has an end section that is permeable for airborne sound and which is surrounded by a jacket in this end section to form a reflective chamber. To make it inexpensive to manufacture the exhaust pipe with the reflective chamber, the jacket and the end section are manufactured in one piece.

1 . A muffler for an exhaust system of an internal combustion engine of a motor vehicle, comprising: 
 an exhaust pipe having an end section that is permeable for airborne sound and is sheathed by a jacket in this end section to form a reflective chamber,    wherein, the jacket and the end section are made of one piece.    
   
   
       2 . The muffler according to  claim 1 , wherein the jacket is formed by a pipe section that is bent or rolled back over the end section on the outside.  
   
   
       3 . The muffler according to  claim 1 , wherein the end section is formed by a pipe section that is bent or rolled back through the jacket on the inside.  
   
   
       4 . The muffler according to  claim 1 , wherein the jacket or the end section has a ring collar which is in contact with the exhaust pipe and protrudes radially on its end remote from an opening in the exhaust pipe.  
   
   
       5 . The muffler according to  claim 1 , wherein the end section perforated.  
   
   
       6 . The muffler according to  claim 1 , wherein the exhaust pipe is an outlet pipe leading out of a housing of the muffler.  
   
   
       7 . A method for manufacturing an exhaust pipe for a muffler for an exhaust for an internal combustion engine, the muffler having a reflective chamber surrounding an end section of an exhaust pipe, said end section being permeable for airborne sound, the method comprising: 
 making an outlet pipe, which has a first pipe section beginning at a pipe opening and a second pipe section connected to the first pipe section, permeable for airborne sound in the second pipe section, and    bending the first pipe section back over the second pipe section on the outside,    wherein, the two pipe sections begin at an opening in the exhaust pipe with the second pipe on the inside forming the end section and the first pipe section on the outside forming a jacket enclosing the reflective chamber.    
   
   
       8 . The method according to  claim 7 , wherein the bending back operation comprises a rolling process.  
   
   
       9 . The method according to  claim 7 , wherein the respective pipe section is perforated to make it permeable for airborne sound.  
   
   
       10 . A method for manufacturing an exhaust pipe for a muffler for an exhaust for an internal combustion engine, the muffler having a reflective chamber surrounding an end section of an exhaust pipe, said end section being permeable for airborne sound, the method comprising: 
 making an outlet pipe, which has a first pipe section beginning at a pipe opening and a second pipe section beginning at the first pipe section, permeable for airborne sound in the first pipe section, and,    bending the first pipe section back through the second pipe section on the inside, so that the two pipe sections begin at an opening in the exhaust pipe,    wherein, the first pipe section on the inside forms the end section, while the second pipe section on the outside forms a jacket surrounding the reflective chamber.    
   
   
       11 . The method according to  claim 10 , wherein the bending back operation is embodied as a rolling process.  
   
   
       12 . The method according to  claim 10 , wherein the respective pipe section is perforated to make it permeable for airborne sound.