Patent ID: 7931013

Claim:
A heat exchanger ( 11 , 41 ) for an EGR system comprising a casing ( 13 , 43 ) housing at least one cooling chamber for the gas circulating through a plurality of pipes and heads ( 15 , 17 ; 45 , 47 ) at its ends coupled to the gas inlet pipe coming from the exhaust manifold and to the gas outlet pipe connected to the intake manifold of the engine, wherein: a) the heat exchanger is configured with three differentiated area ( 21 , 23 , 25 ; 51 , 53 , 55 ) for gas circulation from the inlet pipe to the outlet pipe; b) the inlet pipe and the outlet pipe are located at opposite ends of the exchanger ( 11 , 41 ) and wherein the casing ( 13 ) has a circular section and the three differentiated gas circulation areas ( 21 , 23 , 25 ) are arranged concentrically inside a single cooling chamber; the inlet head ( 15 ) includes a part ( 27 ) which, on its outer side, closes off the access of the inlet gas to the inner area ( 25 ) and the intermediate area ( 23 ), but it allows the passage thereof to the outer area ( 21 ) and, on its inner side, facilitates gas circulation from the intermediate area ( 23 ) to the inner area ( 25 ); and the outlet head ( 17 ) includes a distribution chamber ( 29 ) for distributing the gas coming from the outer area ( 21 ) to the intermediate area ( 23 ).