| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston for an internal combustion engine easy in manufacture, and capable of enhancing cooling efficiency, by avoiding a collision (mutual interference) of cooling oil discharged via passages of two systems in the vicinity of an outlet part. SOLUTION: A cooling passage 15 is arranged in a head part of a piston 11, and has an inlet part formed in a substantially annular ring shape, the passages 17a and 17b of two systems separated so as to be capable of mutually guiding the cooling oil in the inverse direction from the inlet part 16, and the outlet part 18. The passages 17a and 17b are formed so as to be positioned on a plane orthogonal to the shaft direction of the piston 11, and the inlet part 16 and the outlet part 18 are formed so as to extend in parallel to the shaft direction of the piston 11. Both passages 17a and 17b merge in the outlet part 18, and outlet side end parts 17ae and 17be of the respective passages 17a and 17b are formed so as to be offset in the radial direction of the piston 11. COPYRIGHT: (C)2006,JPO&NCIPI
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