Egr cooler

Abstract

An EGR cooler includes: a casing in which cooling water flows; a plurality of tubes in which exhaust gas flows, the plurality of tubes being housed in the casing; a header plate to which ends of the plurality of tubes are bonded, the header plate being bonded to an end of the casing; an inlet tank into which the exhaust gas is introduced, the inlet tank being bonded to the end of the casing; and a shielding member being provided in the inlet tank to shield a circumferential wall of the inlet tank from the introduced exhaust gas.

1 . An EGR cooler comprising:
 a casing in which cooling water flows;   a plurality of tubes in which exhaust gas flows, the plurality of tubes being housed in the casing;   a header plate to which ends of the plurality of tubes are bonded, the header plate being bonded to an end of the casing;   an inlet tank into which the exhaust gas is introduced, the inlet tank being bonded to the end of the casing; and   a shielding member being provided in the inlet tank to shield a circumferential wall of the inlet tank from the introduced exhaust gas, the shielding member being fixed to the inlet tank with a clearance being formed between the shielding member and the header plate.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . The EGR cooler according to  claim 1 , wherein an opening of an exhaust gas outlet of the shielding member covers entrances of all the tubes. 
     
     
         5 . The EGR cooler according to  claim 1 , wherein the shielding member is gradually widened toward an exhaust gas outlet. 
     
     
         6 . The EGR cooler according to  claim 4 , wherein, the opening of the exhaust gas outlet is provided with a cylindrical outlet end having a diameter substantially constant along a flow direction of the exhaust gas.