EGR COOLER

摘要

An EGR cooler where stagnation of cooling water is prevented without imposing restriction on an installation attitude of the cooler. An EGR cooler has tubes (3) and a shell (1) surrounding the tubes (3). In the EGR cooler, cooling water (9) is fed to and discharged from the inside of the shell (1) and an exhaust gas is passed through the tubes (3) for heat exchange between the exhaust gas and the cooling water (9). An annular cooling water feeding chamber (11) is fitted on the shell (1), at a position near axially one end of the shell (1), and a cooling water inlet tube (4) is connected to the outer periphery of the cooling water feeding chamber (11). Communication holes (12) are arranged in places in the circumferential direction of a portion encapsulated by the cooling water feeding chamber (11) of the shell (1), and the holes (12) are arranged such that their diameters become steppedly smaller as the holes are further away from the position where the cooling water inlet tube (4) is connected. As a result, the cooling water (9) is substantially equally led from each communication hole (12) into the shell (1).