| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling structure of an EGR cooler, capable of restraining local boiling by a two-piece type, capable of preventing reduction in durability, and capable of enhancing the whole heat exchange efficiency. SOLUTION: Two heat exchangers are formed by adding a cooling water outlet to a heat exchanger outer shell on the side for arranging a cooling water inlet, and adding the cooling water inlet to a heat exchanger outer shell on the side for arranging the cooling water outlet, in a position of the heat exchanger outer shell corresponding to these divided respective spaces, by axially dividing the respective tube outer peripheral side spaces, by adding a partition plate to a central part in the axial direction in a tube assembly stored in the heat exchanger outer shell; and are constituted by connecting an engine cooling water pipe connected to the high temperature side heat exchanger for passing EGR gas first and the low temperature side heat exchanger for passing the EGR gas after this heat exchanger, among these two heat exchangers, so as to cool the high temperature side heat exchanger after cooling the low temperature side heat exchanger. COPYRIGHT: (C)2008,JPO&INPIT
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