Gas conduit, particularly for an internal combustion engine

Abstract

1. A gas conduit, in particular for an internal combustion engine. 2.1 The invention proposes a gas conduit section ( 1 ), in particular an exhaust manifold, for an internal combustion engine, and also an internal combustion engine with an exhaust-gas catalytic converter arranged in the exhaust system. 2.2 According to the invention, the conduit section ( 1 ) has a porous inlay ( 2 ), preferably in the form of a sintered shaped body, which at least partially bears against its inner wall and forms a hollow body through which gas can flow freely; the internal combustion engine according to the invention has in its exhaust system, upstream of the exhaust-gas catalytic converter arranged therein, a conduit section which in particular includes a porous sintered shaped body through which gas can flow freely. 2.3 Use in particular in motor vehicles with an internal combustion engine.

1 - 11 . (canceled)  
   
   
       12 . A gas conduit section of an exhaust manifold for an internal combustion engine, comprising an inner wall and a porous inlay which at least partially bears against the inner wall and forms a hollow body through which gas can flow freely.  
   
   
       13 . The conduit section as claimed in  claim 12 , wherein the inlay is formed from a sintered, shaped body that is able to withstand high temperatures.  
   
   
       14 . The conduit section as claimed in  claim 13 , wherein the sintered, shaped body is of a sintered material which is predominantly metallic.  
   
   
       15 . The conduit section as claimed in  claim 14 , wherein the sintered, shaped body is formed predominantly from sintered material particles in fiber form.  
   
   
       16 . The conduit section as claimed in  claim 14 , wherein the sintered, shaped body is formed predominantly from sintered material particles which are approximately spherical in form.  
   
   
       17 . The conduit section as claimed in  claim 16 , wherein the sintered, shaped body is formed predominantly from sintered material particles in the form of hollow spheres.  
   
   
       18 . The conduit section as claimed in  claim 16 , wherein the sintered material particles have an external diameter in the range from 0.1 mm to 10 mm.  
   
   
       19 . The conduit section as claimed in  claim 17 , wherein the sintered material particles have an external diameter in the range from 0.1 mm to 10 mm.  
   
   
       20 . The conduit section as claimed in  claim 19 , wherein the sintered material particles have a wall thickness which is in the range from 1% to 20% of the external diameter.  
   
   
       21 . The conduit section as claimed in  claim 15 , wherein the sintered material has a porosity in the range from 1% to 30%.  
   
   
       22 . The conduit section as claimed in  claim 16 , wherein the sintered material has a porosity in the range from 1% to 30%.  
   
   
       23 . The conduit section as claimed in  claim 17 , wherein the sintered material has a porosity in the range from 1% to 30%.  
   
   
       24 . The conduit section as claimed in  claim 15 , wherein the sintered, shaped body has a catalytically active coating.  
   
   
       25 . The conduit section as claimed in  claim 16 , wherein the sintered, shaped body has a catalytically active coating.  
   
   
       26 . The conduit section as claimed in  claim 17 , wherein the sintered, shaped body has a catalytically active coating.  
   
   
       27 . The conduit section as claimed in  claim 18 , wherein the external diameter is in a range of from 0.5 mm to 2 mm.  
   
   
       28 . The conduit section as claimed in  claim 19 , wherein the external diameter is in a range of from 0.5 mm to 2 mm.  
   
   
       29 . The conduit section as claimed in  claim 20 , wherein the wall thickness is in the range from 2% to 5% of the external diameter.  
   
   
       30 . The conduit section as claimed in  claim 21 , wherein the porosity is in the range from 2% to 5%.  
   
   
       31 . The conduit section as claimed in  claim 22 , wherein the porosity is in the range from 2% to 5%.  
   
   
       32 . The conduit section as claimed in  claim 23 , wherein the porosity is in the range from 2% to 5%.  
   
   
       33 . An internal combustion engine having an exhaust system in which an exhaust-gas catalytic converter is arranged, the exhaust system comprising a conduit section upstream of the exhaust-gas catalytic converter having an inner wall, and a porous, sintered, shaped body which at least partially bears against the inner wall of the conduit section and through which gas can flow freely, the sintered, shaped body being formed from sintered material particles which are predominantly metallic in form.  
   
   
       34 . The internal combustion engine as claimed in  claim 33 , wherein the sintered, shaped body is formed predominantly from sintered material particles which are approximately spherical in form.  
   
   
       35 . The conduit section as set forth in  claim 34 , wherein the sintered, shaped body has a catalytically active coating.