| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an EGR cooling device capable of improving cooling efficiency of an EGR gas while being miniaturized.SOLUTION: An EGR cooling device 22 includes a cooling passage 50 disposed in an EGR passage 2002. A water channel member 44, which is a part of a circulation water channel for circulating cooling water to a water jacket 32, is disposed in opposition to an outer wall 26A of a cylinder block 26 positioned outside of the water jacket 32. The cooling passage 50 is disposed between the outer wall 26A of the cylinder block 26 positioned outside of the water jacket 32 and the water channel member 44. A wall portion configuring the cooling passage 50 includes a first wall portion 50A applying an outer wall 26A of the cylinder block 26 positioned outside of the water jacket 32 as a wall portion, and a second wall portion 50B applying a part of the water channel member 44 opposed to the outer wall 26A of the cylinder block 26 as a wall portion.</p> |
