| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cooling structure of internal combustion engine capable of improving an exhaust gas purifying efficiency by increasing a volume of an EGR passage even if a volume of a cooling water passage is increased. <P>SOLUTION: The cooling structure 100 of internal combustion engine includes a cylinder head 14 in which the cooling water passage 14a opens on a wall 14b on one side, and a pipe coupling member 20 coupled to the wall 14b on one side. The pipe coupling member 20 includes a cooling water outlet 21 to which supply pipes P1 to P4 are coupled, a cooling water inlet 22 to which return pipes P6 to Pí8 are coupled, and a path 23 through which an EGR gas flows. The cooling water outlet 21 and the cooling water inlet 22 are provided extendingly in the width direction of the wall 14b on one side to be arranged one above the other. The path 23 is formed in the extending direction of the cooling water outlet 21. The supply pipes P2, P4 and the return pipes P6, P8 which are coupled to an EGR cooler 42 and a heater 46 are coupled to the pipe coupling member 20 at a position biased to the sides of the EGR cooler 42 and the heater 46. <P>COPYRIGHT: (C)2013,JPO&INPIT |
