| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a water jacket structure of a cylinder head capable of improving cooling efficiency of an exhaust collection part while restraining increase of an amount of cooling liquid.SOLUTION: The water jacket structure comprises: plural combustion chamber peak parts 21; plural suction ports 22 and plural exhaust ports 23; an exhaust collection part 24 for collecting the plural exhaust ports 23 inside the cylinder head 2; and an exhausting water jacket 70 for cooling the exhaust collection part 24. The exhausting water jacket 70 has: an upper exhausting water jacket 80 arranged on an upper side in a cylinder axial line Lc direction to the exhaust collection part 24; and a lower exhausting water jacket 90 arranged on a lower side in the cylinder axial line Lc direction to the exhaust collection part 24. The upper exhausting water jacket 80 and the lower exhausting water jacket 90 form flow passages independent from each other inside the cylinder head 2.</p> |
