Service joint for an engine exhaust system component

Abstract

The present disclosure relates to a vehicle exhaust system component including first and second conduits having double wall constructions. The first and second conduits are connected to one another at a service joint. An aftertreatment device is mounted within the first and second conduits. The aftertreatment device has a length. The aftertreatment device is positioned within the first and second conduits such that the service joint surrounds the aftertreatment device at an intermediate location along the length of the aftertreatment device.

1 . A vehicle exhaust system component comprising: 
 a first conduit having a double wall construction;    a second conduit having a double wall construction;    a service joint connecting the first and second conduits;    an aftertreatment device mounted within the first and second conduits, the aftertreatment device having a length, the aftertreatment device being positioned within the first and second conduits such that the service joint surrounds the aftertreatment device at an intermediate location along the length of the aftertreatment device.    
   
   
       2 . The vehicle exhaust system component of  claim 1 , wherein the aftertreatment device includes a can, catalyzed substrate positioned within the can and a mounting mat positioned between the can and the substrate, wherein the mat assists in insulating the service joint from high internal temperatures corresponding to the substrate of the aftertreatment device.  
   
   
       3 . The vehicle exhaust system component of  claim 2 , wherein the service joint includes flanges, and wherein an insulating gap extends radially from the can of the aftertreatment device to the flanges of the service joint.  
   
   
       4 . The vehicle exhaust system component of  claim 3 , further comprising a fastening arrangement for securing the flanges of the service joint together.