| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piston for a diesel internal combustion engine including a combustion chamber having a shape for widely agitating air in the combustion chamber and fuel spray injected from a fuel injection nozzle. Ž<P>SOLUTION: This piston 1 for the diesel internal combustion engine including the combustion chamber 10 formed in a top 1a includes a center projecting portion 11, a peripheral projecting portion 12, and an edge portion 13. The center projecting portion 11 forms the bottom wall 10a of the combustion chamber 10, projecting in a conical shape toward the fuel injection nozzle N, and having a skirt portion 111 continuously connected to a portion on the side of the bottom wall of the peripheral wall 10b of the combustion chamber 10 by a toroidal curved surface. The peripheral projecting portion 12 is formed into a shape projecting toward the fuel injection nozzle N over the whole periphery of the peripheral wall 10b from the bottom wall 10a to the top 1a. The edge portion 13 is provided with a reentrant angle R on the peripheral wall 10b within a range to the top portion 1a from a portion on a side closer to the top portion than the peripheral projecting portion 12 and having larger diameter than the peripheral projecting portion 12. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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