| 摘要 |
PROBLEM TO BE SOLVED: To prevent formation of condensate by suppressing cooling of exhaust gas mixed with intake air during cold time.SOLUTION: An exhaust mixing device 19 introduces exhaust gas to intake air flowing through an intake passage so as to mix the intake air with the exhaust gas. The exhaust mixing device 19 includes an exhaust annular passage 55 annularly provided on an outer periphery of the intake passage so that the exhaust gas flows therethrough, an exhaust introduction passage 57 for introducing the exhaust gas to the exhaust annular passage 55, an exhaust introduction hole 59 provided on a passage wall 53 between the intake passage and the exhaust annular passage 55 and introducing the exhaust gas to a converging part 58 of the intake air and the exhaust gas which is constituted by an inner side of the passage wall 53, and a hot water passage 62 provided adjacently to the exhaust annular passage 55 so that hot water flows therethrough. A wall surface of the passage wall 53 on the side of the exhaust annular passage 55 is formed of metal, and a wall surface on the side of the converging part 58 is formed of a resin layer 61. A passage cross sectional area of the converging part 58 is set to be larger than a passage cross sectional area of the intake passage on the upstream side and the downstream side of the converging part 58. The exhaust introduction hole 59 is formed on the passage wall 53 so that the exhaust gas is introduced at right angles with respect to the flow of the intake air in the converging part 58.SELECTED DRAWING: Figure 8 |
