Patent ID: 7337755
Filing Date: 2008-03-04
Classification: F01M,F01P

Abstract:
1. A cylinder head cooling structure for an internal combustion engine, the engine comprising a plurality of cylinders and a cylinder head, the cylinder head comprising a spark plug mounting hole for each cylinder, a plurality of intake ports, and a plurality of exhaust ports, the cylinder head being formed such that a cooling oil jacket is provided about the periphery of each spark plug mounting hole, wherein each of the intake ports and exhaust ports is bifurcated into a fork portion adjacent to a respective cylinder thereby creating first and second intake port branches and first and a second exhaust port branches, respectively, and wherein a respective oil entry passage is provided in said cylinder head extending between said first and second intake port branches of each intake port for conducting oil into said cooling oil jacket, and a respective oil exit passage is provided in said cylinder head extending between said first and second exhaust port branches of each exhaust port for receiving oil discharged from said cooling oil jacket.