| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricating structure for an internal combustion engine, capable of lubricating a pair of journal parts of a crank shaft without forming a long case oil path, while easily supplying oil to a jet nozzle provided in a main bearing part to cool a piston. SOLUTION: In the lubricating structure for the internal combustion engine, light oil paths C1, C2 are formed in the crank shaft 20, which are opened to the outer peripheral face of the second journal part 20Lj and which extend through the second journal part 20Lj to a crank pin part 20p, and the jet nozzle N1 is provided in an engine case for injecting oil into a cylinder bore 12b. A light oil path C3 is formed in the crank shaft 20 extending from the crank pin part 20p further to the first journal part 20Rj and bent extending therefrom in the radial direction, and opened to the outer peripheral face of the first journal part 20Rj. In a first main bearing part 11Rb journaling the first journal part 20Rj, the jet nozzle N1 is provided and a piston jet oil path J1 is formed to communicate a bearing hole journaling the first journal part 20Rj with the jet nozzle N1. COPYRIGHT: (C)2009,JPO&INPIT
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