Cooling def doser

Abstract

An apparatus for cooling a DEF doser tip in an engine having an exhaust pipe comprises a cooling block connected with the DEF doser tip. A first port is connected with the cooling block. One end of a cooling conduit connected to the first port. An opposite end of the cooling conduit connected to a first end of a second tube. An opposite end of the second tube connected with a source of engine coolant. A second port is connected with the cooling block. An end of the second port opposite to the cooling block is connected with the source of engine coolant. Means for maintaining configuration of the cooling conduit are disposed between the cooling conduit and the exhaust pipe.

What is claimed is: 
     
         1 . An apparatus for cooling a DEF doser tip in an engine having a selective catalytic reduction system and an exhaust pipe, the apparatus for cooling the DEF doser tip comprising:
 a cooling block connected with the DEF doser tip;   a first port connected with the cooling block;   a cooling conduit;   one end of the cooling conduit connected to the first port;   an opposite end of the cooling conduit connected to a first end of a second tube;   an opposite end of the second tube connected with a source of engine coolant;   a second port connected with the cooling block;   an end of the second port opposite to the cooling block connected with the source of engine coolant; and   means for maintaining configuration of the cooling conduit disposed between the cooling conduit and the exhaust pipe.   
     
     
         2 . The apparatus as defined in  claim 1  wherein the means for maintaining configuration of the cooling conduit comprises a support bar fixed to the cooling conduit and to a housing adjacent the DEF doser tip for supplying rigidity to the cooling conduit. 
     
     
         3 . The apparatus as defined in  claim 2  wherein the support bar is fixed to the cooling conduit at two spaced-apart locations. 
     
     
         4 . The apparatus as defined in  claim 2  wherein the support bar is fixed to the housing at a pre-existing bore on the housing. 
     
     
         5 . The apparatus as defined in  claim 2  wherein an end of the support bar is fixed to the exhaust pipe. 
     
     
         6 . The apparatus as defined in  claim 1  wherein the means for maintaining configuration of the cooling conduit comprises a support clip joining the exhaust pipe with the cooling conduit. 
     
     
         7 . The apparatus as defined in  claim 6  further comprising:
 a strap joining the exhaust pipe with the support clip.