| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling type valve seat ring for a cylinder head of an internal combustion engine, having good cooling property and being technically easy to manufacture for protecting a valve seat receiving region in the cylinder head against corrosion. SOLUTION: At least two ring portions 4, 5, 21, 22 of the valve seat rings 3, 20 are assembled, and both ring portions are firmly joined to each other to form ring flow chambers 6, 23. The flow chambers are pressed into a cylinder head 1 through its press-in face formed. Thereby, they are integrated with a coolant circuit in the internal combustion engine via communication holes 10, 24 formed in at least one of both ring portions. COPYRIGHT: (C)2006,JPO&NCIPI
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