COOLING STRUCTURE OF CYLINDER HEAD

摘要

PROBLEM TO BE SOLVED: To provide a structure for improving cooling effect of each part inside a cylinder head such as a combustion face and a valve guide part for avoiding high thermal stress caused by high output of the cylinder head. SOLUTION: In this structure forming a fluid refrigerant jacket between both air supply ports 9a and 9a of air supply valves or between both air exhaust ports 11a and 11a of air exhaust valves in the cylinder head of an internal combustion engine having a plurality of air supply valves and air exhaust valves per cylinder, a narrow and small part 7c is formed between both air supply ports 9a and 9a or between both air exhaust ports 11a and 11a nipping the fluid refrigerant jacket to narrow fluid refrigerant flow area of the fluid refrigerant jacket. COPYRIGHT: (C)2006,JPO&NCIPI