| 摘要 |
PROBLEM TO BE SOLVED: To reduce pressure loss of cooling water at a cooling water outlet opening part.SOLUTION: In an engine cylinder head structure, a pair of water jackets 13 is formed on upper and lower sides, an exhaust-side jacket 21 on the upper side and a jacket body 19 on the lower side are connected to each other at the cooling water outlet opening part 23, and a rib 31 protruding inside the cooling water outlet opening part 21 is formed at a part corresponding to a merging position of the cooling water from the exhaust-side jacket 21 in an inner peripheral surface of the cooling water outlet opening part 23 and the cooling water from the jacket body 19. |
