Internal combustion engine exhaust gas conveying device with internal lining, as well as process for production thereof

Abstract

Exhaust gas conveying apparatus of an internal combustion engine with internal liner in which the liner features capillary bores which are open at least towards the exhaust gas conveying side of the liner as well as process for the fabrication of said apparatus.

1 . An exhaust gas conveying apparatus of an internal combustion engine with internal liner exposed on at least one side to conveyed exhaust gas, wherein the liner features capillary bores which are open at least towards the exhaust gas conveying side of the liner.  
   
   
       2 . An apparatus according to  claim 1 , wherein the liner features capillary bores with different depths and/or different diameters.  
   
   
       3 . An apparatus according to  claim 2 , wherein the liner features capillary bores with different depths and/or different diameters such that it exhibits a gradient of its active surface.  
   
   
       4 . An apparatus according to  claim 1 , wherein the liner features capillary bores which are oriented generally perpendicular to the exhaust gas conveying surface of the liner.  
   
   
       5 . An apparatus according to  claim 1 , wherein the liner features capillary bores which are inclined with respect to the exhaust gas conveying surface of the liner.  
   
   
       6 . An apparatus according to  claim 1 , wherein at least a partial air gap remains between the outer wall of the liner and the internal wall of the exhaust gas conveying apparatus.  
   
   
       7 . An apparatus according to  claim 1 , wherein the apparatus is located inside the exhaust gas tract of a motor vehicle.  
   
   
       8 . An exhaust gas conveying exhaust manifold in a motor vehicle with an internal liner exposed on at least one side to conveyed exhaust gas, wherein the liner features capillary bores which are open at least towards the exhaust gas conveying side of the liner.  
   
   
       9 . A process for the fabrication of an exhaust gas conveying apparatus of an internal combustion engine with internal liner, comprising: 
 providing a liner dimensioned to fit in said exhaust gas conveying apparatus, and    producing capillary bores in the liner.    
   
   
       10 . An apparatus according to  claim 6 , wherein at least a partial air gap remains between the outer wall of the liner and the internal wall of the exhaust gas conveying apparatus, such that the majority of the outer wall of the liner is separated from the internal wall of the exhaust gas conveying apparatus by said air gap.  
   
   
       11 . An apparatus according to  claim 7 , wherein the apparatus is located inside the exhaust gas tract of a motor vehicle in front of a multi-way exhaust gas catalytic converter.