| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine cooling structure for restraining an excessive rise in a contact fire surface temperature of a combustion chamber opposed part opposed to inter-port clearance by making cooling water flow to the inter-port clearance of intake-exhaust ports. SOLUTION: Intake-exhaust valves are arranged by sandwiching the cylinder head center line LO, and at least one of the intake-exhaust valves is juxtaposed by two in the axial direction X to one cylinder. A cooling water passage is provided for making the cooling water flow in the axial direction X. A cylinder head has a port wall part for forming the intake-exhaust ports 22 and 23 for communicating a combustion chamber C with the cylinder head outside via at least one valve of the intake-exhaust valves. The cooling water passage has a central waterway r1 for making the cooling water flow to the other end side from the axial directional one end side, intake-exhaust side waterways r2 and r3 and a sucking-out passage rs passing between the two valves, and a projecting part 27 is formed from an axial directional other end side wall surface in the port wall part positioned on the axial directional one end side among the port wall part. COPYRIGHT: (C)2004,JPO&NCIPI
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