To eliminate increase of man-hour for working to prevent increase of pressure loss, and enhance cooling efficiency.
A cylindrical cooling pipe 8 is provided in the outer periphery of an exhaust gas conduit 3 communicating the exhaust manifold of an engine with an intake manifold to form a cylindrical cooling water passage 9 between the exhaust gas conduit 3 and the cooling pipe 8. An introduction pipe joint 10 for introducing cooling water supplied from an outside into the cooling water passage 9 is provided in an outer circumferential surface 8b in one axial directional end part of the cooling pipe 8. A discharge pipe joint 11 for discharging the cooling water from the cooling water passage 9 to an outside is provided in the outer circumferential surface 8b in the other end part of the cooling pipe 8. Respective central axial lines of the introduction pipe joint 10 and the discharge pipe joint 11 are provided to be eccentric relating to the central axis of the cooling water passage 9.
MIURA SANEHIRO
KATAYAMA HARUYUKI
TOYOTA MOTOR CORP