Insert, holder and post-treatment unit for exhaust gases

Abstract

An insert ( 50 ) for a holder ( 22 ) in a post-treatment unit ( 10 ) for exhaust gases of a combustion engine, has a socket ( 52 ) for a treatment component ( 70 ) intended to have flowing through it the exhaust gases which are to be treated, a connector ( 54 ) for holding the insert ( 50 ) in position in the holder ( 22 ), and a seal ( 82 ) for gastight closure of the socket ( 52 ) relative to the holder ( 22 ). The seal includes a sealing ring ( 82 ) on the socket ( 52 ) for cooperation in self-centering seat engagement with an opposite sealing ring ( 84 ) in the holder.

1 . An insert ( 50 ) for a holder ( 22 ) in a post-treatment unit ( 10 ) for exhaust gases of a combustion engine, comprising
 a socket ( 52 ) for a treatment component ( 70 ) intended to have flowing through it the exhaust gases which are to be treated,   connecting means ( 54 ) for holding the insert ( 50 ) in position in the holder ( 22 ), and   sealing means ( 82 ) for gastight closure of the socket ( 52 ) relative to the holder ( 22 ),   characterised   in that said sealing means ( 80 ) comprise a sealing ring ( 82 ) on the socket ( 52 ) for cooperation in self-centering seat engagement with an opposite sealing ring ( 84 ) in the holder.   
     
     
         2 . An insert according to  claim 1 , in which the sealing ring ( 82 ) is arranged for conical seat engagement with the opposite sealing ring ( 84 ). 
     
     
         3 . An insert according to  claim 1  or  2 , in which the sealing ring ( 82 ) is made of metal, particularly steel. 
     
     
         4 . An insert according to any one of the foregoing claims, in which the sealing ring ( 82 ) is machined to such high surface fineness that said closure becomes tight enough to meet prevailing emission requirements. 
     
     
         5 . An insert according to any one of the foregoing claims, in which the sealing ring ( 82 ) is located in a corner recess of the socket ( 52 ). 
     
     
         6 . An insert according to any one of the foregoing claims, in which said connecting means comprise a threaded connection ( 24 ,  54 ). 
     
     
         7 . An inset according to  claim 6 , in which said connecting means comprise an outside thread ( 54 ) on the socket ( 52 ) for engagement with an inside thread ( 24 ) on the holder ( 22 ). 
     
     
         8 . An insert according to any one of the foregoing claims, in which an outer end of the socket ( 52 ) has a recess ( 58 ) situated at a circumference for a tool for fastening and releasing the connection ( 54 ,  24 ). 
     
     
         9 . A holder ( 22 ) for an insert ( 50 ) according to any one of the foregoing claims for a post-treatment unit ( 10 ) for exhaust gases and provided with said opposite sealing ring ( 84 ). 
     
     
         10 . A holder according to  claim 9 , in which the opposite sealing ring ( 84 ) is made of metal, particularly steel. 
     
     
         11 . A holder according to  claim 9  or  10 , in which the opposite sealing ring ( 84 ) is machined to such high surface fineness that said closure becomes tight enough to meet prevailing emission requirements. 
     
     
         12 . A holder according to any one of  claims 9 - 11 , in which the opposite sealing ring ( 84 ) is located in a corner recess of the holder ( 22 ). 
     
     
         13 . A post-treatment unit ( 10 ) for exhaust gases provided with an insert ( 50 ) and/or holder ( 22 ) according to any one of the foregoing claims.