| 摘要 |
Provided is a poppet valve which is configured so as to prevent all the three modes of heat transfer from occurring, thereby enabling maximum combustion efficiency to be achieved. A poppet valve has an umbrella section (14) integrally formed on one end side of a shaft section (12). A hollow section (19) extending along an umbrella front surface (24) is formed within the umbrella section (14). A metallic layer (17) for blocking radiation heat is formed on the ceiling surface (25) of the hollow section (19), and a heat insulating section is formed between the metallic layer (17) and the bottom surface of the hollow section (19). Among the modes of heat transfer, the conduction and convention are blocked by the heat insulating section, and the radiation is blocked by the metallic layer (17). |
