VALVE SEAT FOR ENGINE AND CYLINDER HEAD FOR ENGINE

摘要

PROBLEM TO BE SOLVED: To prevent galvanic corrosion, even if a valve seat and its installation receiving part are a combination of dissimilar metals easily causing the galvanic corrosion.

SOLUTION: A plating layer 14 is formed on a surface of an iron-based valve seat body 17 arranged in the installation receiving part 13 arranged in an intake port 6 of an aluminum alloy cylinder head 2. Since the plating layer 14 is interposed between the cylinder head 2 and the valve seat body 17, the galvanic corrosion can be prevented by reducing an electric potential difference in the dissimilar metals between the installation receiving part 13 and the valve seat body 17 via water.

COPYRIGHT: (C)2005,JPO&NCIPI