| 摘要 |
A cooling structure for a cylinder head, wherein the cylinder head has formed therein: an exhaust manifold (21) having branch sections (211) and also having a collecting section (212) to which the branch sections (211) connect; a first water jacket (22) and a second water jacket (23), which cover the exhaust manifold (21); connection passages (25, 26, 28, 29) which supply cooling water in the second water jacket (23) to the first water jacket (22); and a cooling water outlet (27) which connects the first water jacket (22) to the outside. The connection passages (25, 26, 28, 29) include the first connection passage (28) which is closest to the collecting section (212), and the second connection passage (25) which is located at the downstream end of each of the water jackets (22, 23). The flow passage cross-sectional area (S2) of the second connection passage (25) is set to be less than the flow passage cross-sectional area (S1) of the first connection passage (28). |
