| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston structure of an internal combustion engine with excellent durability for reducing the stress concentration by the explosive force generated in a combustion chamber. SOLUTION: In the piston of the internal combustion engine with a dent on the piston top surface, the ratio of the diameter of the dent to the piston diameter is set in the range from 0.5 to 0.65 and the compression ratio is set in the range from 14.5 to 16.5 so that the stress will not be concentrated in a wall dividing the combustion chamber formed on the piston top surface and an oil gallery for cooling the combustion chamber. Further, the oil gallery is formed so that the stress will not be concentrated in the wall dividing the combustion chamber formed on the piston top surface and the oil gallery for cooling the combustion chamber. The wall of the oil gallery lower than the combustion chamber is formed to become thicker as closer to the combustion chamber.
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