| 摘要 |
<p>The present invention relates to an EGR cooler which comprises: a main housing in which an exhaust gas input unit and an exhaust gas output unit are separated, a cooling water input unit and a cooling water output unit are separated, and a space portion is placed; a plurality of cooling tubes which are arranged on top of each other and are installed in the space portion; and a coupling device for forming a cooling water path through which cooling water flows while separating, stacking, and coupling the cooling tubes. The coupling device comprises: a first protruding unit formed in a lower plate of one cooling tube; a second protruding unit formed in an upper plate of another cooling tube; a coupling member for coupling the first protruding unit with the second protruding unit; and a reinforcing unit for reinforcing coupling strength between the first protruding unit and the second protruding unit. Therefore, the amount of infiltrated paste gets larger when the stacked cooling tubes are coupled by a brazing method using paste and a coupling area size increases, thereby increasing durability of a product.</p> |
