Water-cooled exhaust gas recirculation cooler

A water-cooled exhaust gas recirculation (EGR) cooler, which receives exhaust gas from an exhaust line and recirculates cooled exhaust gas to an intake line, the water-cooled EGR cooler comprising:

• a housing having an exhaust gas inlet, into which exhaust gas flows, and an exhaust gas outlet, from which exhaust gas is discharged, the housing further having a coolant inlet, into which a coolant for cooling the exhaust gas flows, and a coolant outlet, from which the coolant is discharged;
• tubes, each of which has an enclosed tube shape, arranged inside the housing with a predetermined interval so that exhaust gas passing from the exhaust gas inlet to the exhaust gas outlet flows inside the tubes;
• a fin bent in a zigzag form, and disposed in an internal side of each of the tubes so that an external surface of the fin is in close contact with an internal surface of each of the tubes;
• and
• a supporter interposed between the tubes, the supporter having a first surface, which is in contact with a tube, and a second surface, which is in contact with another tube,
• wherein the supporter is disposed in a space, in which the coolant flows, so that the predetermined interval between the tubes is maintained,
• wherein the supporter has a bent sheet shape in a zigzag form in a height direction and in a longitudinal direction of the tubes, and flow holes, which pass from one side to another side of the supporter, are spaced apart from each other in the height direction and in the longitudinal direction,
• wherein the supporter includes:
• first members extending in the height direction of the tubes, and arranged in the longitudinal direction of the tubes with a first set interval;
• and
• second members integrally connected with the first members, extending in the longitudinal direction of the tubes, and arranged in the height direction of the tubes with a second set interval,
• wherein the first surface, which is on an external side of one surface of each of the first members, is in contact with one of the tubes, and the second surface, which is on an external side of another surface, is in contact with another one of the tubes, and
• wherein the flow holes are openings arranged between adjacent first members in the longitudinal direction and extending from the first surface to the second surface.