Exhaust Muffler

Abstract

An exhaust muffler includes a hollow body that at least partially houses an exhaust pipe. The exhaust pipe is adapted to allow a flow of exhaust gases therethrough. Further, the exhaust pipe defines a plurality of orifices on the exhaust pipe such that the exhaust gases flowing through the exhaust pipe can flow out of the exhaust pipe within the hollow body and/or flow back into the exhaust pipe from the hollow body through the plurality of orifices. A secondary pipe is disposed within the hollow body and filled with a sound absorbing material. At least one baffle is engaged with the exhaust pipe and the secondary pipe to allow at least one of the exhaust pipe and the secondary pipe to pass therethrough.

What is claimed is: 
     
         1 . An exhaust muffler comprising:
 a hollow body defining an inlet opening and an outlet opening;   an exhaust pipe fluidly coupling the inlet opening to the outlet opening, and disposed at least partially within the hollow body,   wherein the exhaust pipe is adapted to allow a flow of exhaust gases therethrough,   wherein the exhaust pipe defines a plurality of orifices on the exhaust pipe such that the exhaust gases flowing through the exhaust pipe can flow out of the exhaust pipe within the hollow body and/or flow back into the exhaust pipe from the hollow body through the plurality of orifices;   a secondary pipe disposed within the hollow body, wherein the secondary pipe is filled with a sound absorbing material; and   at least one baffle, wherein the baffle is engaged with the exhaust pipe and the secondary pipe to allow at least one of the exhaust pipe and the secondary pipe to pass therethrough.   
     
     
         2 . The exhaust muffler according to  claim 1 , wherein the secondary pipe is capped at least at one end. 
     
     
         3 . The exhaust muffler according to  claim 1 , wherein the at least one baffle includes two baffles disposed parallel to each other such that the exhaust muffler is divided into a first chamber, a second chamber, and a third chamber. 
     
     
         4 . The exhaust muffler according to  claim 3 , wherein the secondary pipe extends across only one of the first chamber, the second chamber, and the third chamber. 
     
     
         5 . The exhaust muffler according to  claim 3 , wherein the secondary pipe extends across at least one of the first chamber, the second chamber, and the third chamber. 
     
     
         6 . The exhaust muffler according to  claim 3 , wherein the secondary pipe extends across all of the first chamber, the second chamber, and the third chamber. 
     
     
         7 . The exhaust muffler according to  claim 1 , wherein the exhaust pipe is made up of a two-part structure. 
     
     
         8 . The exhaust muffler according to  claim 1 , wherein the secondary pipe is made up of a two-part structure. 
     
     
         9 . The exhaust muffler according to  claim 1 , wherein the at least one baffle includes an integrally formed recess such that the secondary pipe is capped at least at one end. 
     
     
         10 . The exhaust muffler according to  claim 1 , wherein the secondary pipe is engaged with the exhaust pipe.