| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oil passage structure for a crank pin, in which lubricant is uniformly supplied to the whole outer circumferential surface of the crank pin pivotally supported by a connecting rod including a range with high oil film pressure. Ž<P>SOLUTION: The structure of the oil passage 22 for supplying oil (lubricant) reaching outlets 22c1 and 22c2 opening in the outer circumferential surface 10c1 of the crank pin 10c is for a crankshaft 10 that is pivotally supported on a larger end part 14b of the connecting rod 14 connected to a piston 12 slidably housed in a cylinder to be rotatable through a bearing metal (bearing) 16. The outlets 22c1 and 22c2 of the oil passage 22c, especially 22c1, is positioned between an extended line 14c1 and mating surfaces 16c1 and 16c2 of the bearing in a rotating direction for the crank pin 10c to the extended line 14c1 of the longer axis of a connection part at a piston position where cylinder internal pressure is the maximum to be open toward an upper metal 16a on the connecting part side. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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