Heat-Insulated Interface Arrangement and Exhaust Gas Aftertreatment Device

Abstract

A heat-insulated interface arrangement for an exhaust gas aftertreatment device. The heat-insulated interface arrangement includes a first electric interface, an inner sheath which ensheathes the first electric interface, and a heat-insulating sheath which ensheathes the inner sheath. The heat-insulating sheath has a ceramic material or is formed from a ceramic material.

What is claimed is: 
     
         1 . A heat-insulated interface arrangement ( 1 ) for an exhaust gas aftertreatment device ( 6 ), comprising:
 a first electric interface ( 3 . 1 );   an inner sheath ( 5 ) which ensheathes the first electric interface ( 3 . 1 ); and   a heat-insulating sheath ( 7 ) which ensheathes the inner sheath ( 5 ), wherein the heat-insulating sheath ( 7 ) has a ceramic material or is formed from a ceramic material.   
     
     
         2 . The heat-insulated interface arrangement ( 1 ) according to  claim 1 , wherein the heat-insulating sheath ( 7 ) is frictionally connected to the inner sheath ( 5 ). 
     
     
         3 . The heat-insulated interface arrangement ( 1 ) according to  claim 1  further comprising an outer sheath ( 19 ) which ensheathes the heat-insulating sheath ( 7 ). 
     
     
         4 . The heat-insulated interface arrangement ( 1 ) according to  claim 3 , wherein the outer sheath ( 19 ) is frictionally connected to the heat-insulating sheath ( 7 ). 
     
     
         5 . The heat-insulated interface arrangement ( 1 ) according to  claim 1 , wherein the inner sheath ( 5 ) and/or an outer sheath ( 19 ) which ensheathes the heat-insulating sheath ( 7 ) has a metallic material or is formed from a metallic material. 
     
     
         6 . A heat-insulated interface arrangement ( 1 ) for an exhaust gas aftertreatment device ( 6 ), comprising:
 a first electric interface ( 3 . 1 );   a heat-insulating sheath ( 7 ) which ensheathes the first electric interface ( 3 . 1 ), wherein the heat-insulating sheath ( 7 ) is formed by a gap ( 23 ) between the first electric interface ( 3 . 1 ) and an outer sheath ( 19 ) ensheathing the heat-insulating sheath ( 7 ); and   an intermediate element ( 21 ) which is disposed on the first electric interface ( 3 . 1 ), wherein the intermediate element ( 21 ) is adjacent to the heat-insulating sheath ( 7 ) and is ensheathed by the outer sheath ( 19 ).   
     
     
         7 . The heat-insulated interface arrangement ( 1 ) according to  claim 6 , wherein:
 the intermediate element ( 21 ) is ring shaped; or   the intermediate element ( 21 ) has at least two intermediate sub-elements ( 25 ).   
     
     
         8 . An exhaust gas aftertreatment device ( 6 ), comprising:
 an exhaust gas aftertreatment housing ( 4 ) which has a wall ( 2 ), wherein an exhaust gas is flowable through the exhaust gas aftertreatment housing ( 4 );   a first electrical conduit ( 31 . 1 );   an electrical feedthrough ( 27 ) which passes the first electrical conduit ( 31 . 1 ) through the wall ( 2 ) of the exhaust gas aftertreatment housing ( 4 ); and   a heat-insulated interface arrangement ( 1 ), wherein the heat-insulated interface arrangement ( 1 ) is disposed outside the exhaust gas aftertreatment housing ( 4 ) on the first electrical conduit ( 31 . 1 ) and is connected to the first electrical conduit ( 31 . 1 ) in an electrically conductive manner.   
     
     
         9 . The exhaust gas aftertreatment device ( 6 ) according to  claim 8 , wherein the heat-insulated interface arrangement ( 1 ) comprises:
 a first electric interface ( 3 . 1 );   an inner sheath ( 5 ) which ensheathes the first electric interface ( 3 . 1 ); and   a heat-insulating sheath ( 7 ) which ensheathes the inner sheath ( 5 ), wherein the heat-insulating sheath ( 7 ) has a ceramic material or is formed from a ceramic material.   
     
     
         10 . The exhaust gas aftertreatment device ( 6 ) according to  claim 8 , wherein the heat-insulated interface arrangement ( 1 ) comprises:
 a first electric interface ( 3 . 1 );   a heat-insulating sheath ( 7 ) which ensheathes the first electric interface ( 3 . 1 ), wherein the heat-insulating sheath ( 7 ) is formed by a gap ( 23 ) between the first electric interface ( 3 . 1 ) and an outer sheath ( 19 ) ensheathing the heat-insulating sheath ( 7 ); and   an intermediate element ( 21 ) which is disposed on the first electric interface ( 3 . 1 ), wherein the intermediate element ( 21 ) is adjacent to the heat-insulating sheath ( 7 ) and is ensheathed by the outer sheath ( 19 ).   
     
     
         11 . The exhaust gas aftertreatment device ( 6 ) according to  claim 9  further comprising a second electrical conduit ( 31 . 2 ) which has a second electric interface ( 3 . 2 ) and a conduit insulation sheath ( 33 );
 wherein the second electric interface ( 3 . 2 ) is connected to the first electric interface ( 3 . 1 ); 
 wherein the conduit insulation sheath ( 33 ) rests against an outer side ( 35 ) of the heat-insulating sheath ( 7 ) and/or an outer sheath ( 19 ) which ensheathes the heat-insulating sheath ( 7 ) and is configured to cover an electrical connection between the first electric interface ( 3 . 1 ) and the second electric interface ( 3 . 2 ). 
 
     
     
         12 . The exhaust gas aftertreatment device ( 6 ) according to  claim 9  further comprising an electric exhaust gas heating device ( 37 ) which is disposed inside the exhaust gas aftertreatment housing ( 4 );
 wherein the electric exhaust gas heating device ( 37 ) is electrically connected to the first electric interface ( 3 . 1 ) via the first electrical conduit ( 31 . 1 ). 
 
     
     
         13 . The exhaust gas aftertreatment device ( 6 ) according to  claim 10  further comprising a second electrical conduit ( 31 . 2 ) which has a second electric interface ( 3 . 2 ) and a conduit insulation sheath ( 33 );
 wherein the second electric interface ( 3 . 2 ) is connected to the first electric interface ( 3 . 1 ); 
 wherein the conduit insulation sheath ( 33 ) rests against an outer side ( 35 ) of the heat-insulating sheath ( 7 ) and/or an outer sheath ( 19 ) which ensheathes the heat-insulating sheath ( 7 ) and is configured to cover an electrical connection between the first electric interface ( 3 . 1 ) and the second electric interface ( 3 . 2 ). 
 
     
     
         14 . The exhaust gas aftertreatment device ( 6 ) according to  claim 10  further comprising an electric exhaust gas heating device ( 37 ) which is disposed inside the exhaust gas aftertreatment housing ( 4 );
 wherein the electric exhaust gas heating device ( 37 ) is electrically connected to the first electric interface ( 3 . 1 ) via the first electrical conduit ( 31 . 1 ).