| 摘要 |
<P>PROBLEM TO BE SOLVED: To supply an oil jet 21 to a cylinder 6 inner wall surface by using lubricating oil supplied through a crankshaft 3 interior. Ž<P>SOLUTION: A multilink type piston crank mechanism equipped with an upper link 11, a lower link 13, and a control link 15 is provided, and the lubricating oil is supplied through the crankshaft 3 interior. In a crankshaft 3 side, an oil supply hole with an opened tip is provided on a thrust bearing surface in an inner side of a crank web, and in a lower link 13 side, an oil guide groove 33 is recessed on an annular flange surface 32 of a crank pin periphery in correspondence to a thrust bearing surface of a crankshaft 3 side. In a predetermined attitude of the lower link 13, if the oil guide groove 33 is aligned with the oil supply hole, the oil jet 21 is supplied. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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