Exhaust gas muffler

Abstract

An exhaust gas muffler is provided for an internal combustion engine, especially the engine of a manually-guided implement such as a power saw, a cut-off machine, or the like. The muffler has a housing having an inlet for exhaust gases and an outlet out of the housing. The housing has an outer wall over which the exhaust gases from the outlet flow. To achieve an adequate cooling of the exhaust gas muffler and the discharging exhaust gases, the exhaust gases out of the outlet draw in atmospheric air between the exhaust gases and the outer wall of the housing.

1 . An exhaust gas muffler for an internal combustion engine, comprising: 
 a housing having an inlet for receiving exhaust gas from said internal combustion engine, an outlet, and an outer wall, wherein said outlet and said outer wall are configured such that exhaust gas flows out of said outlet and over said outer wall, and wherein said exhaust gas that flows out of said outlet draws in atmospheric air between said exhaust gas and said outer wall of said housing.    
   
   
       2 . An exhaust gas muffler according to  claim 1 , wherein in an interior of said housing, exhaust gas flows along said outer wall of said housing.  
   
   
       3 . An exhaust gas muffler according to  claim 2 , wherein exhaust gas in said interior of said housing, and said atmospheric air on an outside of said housing, flow along said outer wall of said housing in a counter current direction relative to one another.  
   
   
       4 . An exhaust gas muffler according to  claim 2 , wherein a channel is formed in said interior of said housing, wherein said channel is delimited relative to an outside of said housing by said outer wall of said housing, wherein said exhaust gas flows through said channel, and wherein said channel opens out at said outlet.  
   
   
       5 . An exhaust gas muffler according to  claim 1 , which further comprises at least one hood, wherein said outlet is formed on said at least one hood.  
   
   
       6 . An exhaust gas muffler according to  claim 1 , wherein said exhaust gas flows out of said outlet at an angle relative to said outer wall of said housing.  
   
   
       7 . An exhaust gas muffler according to  claim 1 , wherein a ramp is disposed on said outer wall of said housing on a side that is disposed opposite said outlet.  
   
   
       8 . An exhaust gas muffler according to  claim 1 , wherein a fin is disposed on said outer wall of said housing, and wherein said fin extends parallel to a direction of flow of exhaust gas along said outer wall of said housing.  
   
   
       9 . An exhaust gas muffler according to  claim 1 , wherein two chambers are provided in said housing and are successively arranged in a direction of flow of said exhaust gas, and wherein a catalytic converter is disposed between said two chambers.  
   
   
       10 . An exhaust gas muffler according to  claim 9 , wherein a spark arrestor screen is disposed, relative to a flow path of exhaust gas, between a second one of said chambers and a channel formed in an interior of said housing.  
   
   
       11 . An exhaust gas muffler according to  claim 9 , wherein a third chamber is disposed, relative to a flow path of exhaust gas, between a second one of said chambers and said outlet.  
   
   
       12 . An exhaust gas muffler according to  claim 11 , wherein a portion of said exhaust gas flows through said third chamber, and a portion of said exhaust gas flows through a channel formed in an interior of said housing.  
   
   
       13 . An exhaust gas muffler according to  claim 1 , wherein said housing comprises two half shells, wherein one of said half shells that faces away from said internal combustion engine is designated an upper half, and the other half shell that faces said internal combustion engine is designated a lower half, and wherein said outlet is formed in said upper half and said inlet is formed in said lower half.  
   
   
       14 . An exhaust gas muffler according to  claim 13 , wherein said outer wall of said housing is a wall of said upper half.  
   
   
       15 . An exhaust gas muffler according to  claim 13 , wherein a first partition is disposed between said two half shells wherein said first partition separates a first chamber from a second chamber, and wherein a catalytic converter is disposed in said first partition.  
   
   
       16 . An exhaust gas muffler according to  claim 15 , which further includes a second partition that is disposed between said first partition and said upper half, and wherein a third chamber is provided that is delimited by said second partition and said upper half.  
   
   
       17 . An exhaust gas muffler according to  claim 16 , wherein a gap is formed between said second partition and said upper half, and wherein exhaust gas flows through said gap into said third chamber.  
   
   
       18 . An exhaust gas muffler according to  claim 16 , wherein a channel is provided that is delimited by said second partition and said upper half.  
   
   
       19 . An exhaust gas muffler according to  claim 16 , wherein a spark arrestor screen is disposed in said second partition.