| 摘要 |
PROBLEM TO BE SOLVED: To provide a crankshaft capable of efficiently supplying lubricating oil to a crank pin from a crank journal. SOLUTION: A journal side hollow part 1K is formed inside the crank journal 1J. As for inside diameter of a peripheral wall 1S of the journal side hollow part 1K, inside diameter a of the peripheral wall 1S in end parts 1E, 2E in the direction of shaft extension is larger than inside diameter b of the peripheral wall 1S of a central part 1M in the direction of shaft extension. Consequently, lubricating oil flowing into the central part 1M in the direction of shaft extension by passing through a supply hole 1H moves into the end parts 1E, 2E in the direction of shaft extension having larger inside diameter of the peripheral wall 1S by centrifugal force. The lubricating oil moved into the end parts 1E, 2E in the direction of shaft extension passes through oil passages 1R, 2R and is supplied into pin side hollow parts 1Q, 2Q. COPYRIGHT: (C)2005,JPO&NCIPI
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