| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder head structure excellent in cooling efficiency.SOLUTION: A cylinder head structure has a cylindrical valve seat (valve seat ring 4) press-fitted in an opening 12 for a combustion chamber in a cylinder head 1 in an internal combustion engine. In a part of a clearance 21 between the opening in the cylinder head and the valve seat, there is provided a low melting point material 22 which is melted by temperature increase of the cylinder head or the valve seat after a start of the internal combustion engine. |
