| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling performance of a back side of a piston, ensure strength thereby, reduce a temperature of a combustion chamber, and suppress generation of knocking by increasing an oil quantity for cooling in the back side of the piston. SOLUTION: In a crankshaft 1 provided with an oil passage for supplying lubricating oil to a large end bearing 6, a cutout part 9 communicated with an outside is disposed on a crank pin part end surface 8 of a crank web 4, and lubricating oil delivered from an oil clearance of the large end bearing 6 is injected to the back side of the piston 11 through the cutout part 9.
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