| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine valve capable of reducing thermal load without increasing the cost. SOLUTION: In this engine valve 1 equipped with a shaft 2 and an umbrella 3, a heat insulating film 4 comprising a ceramics material is formed on an umbrella front 3b and an umbrella back 3c out of the surface of the umbrella part 3, and the heat input amount is suppressed. On the other hand, on the surface of the shaft 2, a heat transfer film 5 comprising aluminum nitride or chromium nitride is formed, and a heat radiation property is enhanced. This engine valve is preferably a solid exhaust valve inside. COPYRIGHT: (C)2010,JPO&INPIT
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