| 摘要 |
<p>PURPOSE:To attempt reduction of heat capacity and improvement of durability with ensuring cooling ability of a water jacket by forming an inner pipe of an exhaust manifold by steel and an outer pipe by cast iron, and by unifying both of them through an internal chill process applied on the inner pipe with the outer pipe. CONSTITUTION:Both ends of an exhaust manifold 6 are connected to an exhaust port 4 and a turbo charger 7 respectively. And the exhaust manifold 6 is formed in a double pipe constitution of an inner pipe 8 and an outer pipe 9. Also, most of a port branch part 10 as an exhaust gas passage communicating to the exhaust port 4 is formed by the inner pipe 8, and a water jacket 11 between which and the outer pipe cooling water is flown is formed on the outer circumferential side of the inner pipe 8. In this case, the inner pipe 8 is formed by a steel pipe and unified with the outer pipe 9 made up of cast iron by molding. Also, the both ends of the inner pipe 8 are connected to the outer pipe 9 by each of connecting part 12.</p> |
