Patent ID: 6595274
Filing Date: 2003-07-22
Classification: F01N,F02M,F28D,F28F,Y02T

Abstract:
An exhaust gas heat exchanger comprising:a plurality of exhaust gas tubes through which exhaust gas generated by combustion flows, wherein the plurality of exhaust gas passages are laminated so as to be disposed substantially in parallel to each other; a tank containing the plurality of exhaust gas tubes and forming a water passage therein through which cooling water flows to exchange heat with the exhaust gas passing through the plurality of exhaust gas tubes; a cooling water inlet pipe disposed on the tank through which the cooling water flows into the tank; a cooling water outlet pipe disposed on the tank through which the cooling water is exhausted from the tank; inlet and outlet bonnets communicating with an upstream side end portion and downstream side end portion of the plurality of exhaust gas tubes, respectively; and inlet side and outlet side core plates isolating the water passage of the tank from the inlet and outlet bonnets, respectively, wherein a peripheral portion of the inlet side core plate is folded toward the inlet bonnet to which the inlet side core plates plate is; and the inlet side core plate is folded at the peripheral portion thereof to form a crank shape having a first wall to be connected to the inner wall of the tank, a flat portion contiguous to the first wall and a second wall contiguous to the flat portion that is connected to the inlet bonnet.