| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cylinder head having an exhaust port where exhaust gas cooling performance and warming-up performance are both achieved. <P>SOLUTION: The cylinder head 10 having the exhaust port 2 where a fin 6 for cooling the exhaust gas is provided by being projected from an inner wall surface. In the fin 6, the contact or noncontact of a tip section 6a of the fin 6 to the inner wall surface of the exhaust port 2 can be switched by displacing the fin 6 making use of the heat expansion displacement of the fin 6 with the exhaust gas flowing inside the exhaust port 2, is provided. <P>COPYRIGHT: (C)2013,JPO&INPIT |
