To provide a pipe body for cooling exhaust gas which prevents dirt appearance of an internal combustion engine without using a cover, even when cooling water is leaked from a passage connection section.
Steps 26b and 26c are formed on an outer peripheral surface 2b of a cooling adapter 2 oriented upward in the vertical direction, and guide the flow of the cooling water leaked from a cooling water delivery section 24 to the outer peripheral surface 2b into an upper end portion of a vertical groove 30. The cooling water flowed down along the vertical groove 30 is separated at the lower side thereof from the cooling adapter 2, blocking free spread and flow of the leaked cooling water on the cooling adapter 2, to prevent the dirt appearance of the internal combustion engine. Further, the front end of an exhaust manifold 6 is divided into two. This allows the leaked cooling water to leave the cooling adapter 2 without contacting the exhaust manifold 6, causing no durability problem of the exhaust manifold 6.
UDA HITOSHI
WATANABE JUNJI
HOSONO AKIHIRO
AISIN TAKAOKA LTD
Makoto Onda