| 摘要 |
<p>Disclosed is an exhaust gas heat exchanger. The exhaust gas heat exchanger comprises a rectangular tube laminated core; and a housing surrounding the periphery of the tube laminated core and having a coolant inlet and a coolant outlet. The tube laminated core is composed as a plurality of plate tubes wherein exhaust gas flows are stacked in a line, and each of the plate tubes includes a pair of main plates forming an exhaust gas flow path of a rectangular cross section and a pair of side plates. Each of the main plates includes a stepped portion formed in both ends by a drawing process, and the stepped portion provides a contact surface between the stacked plate tubes.</p> |
