| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubrication oil passage configuration of a crank shaft, in which an oil supply passage communicating with an oil supply port formed in an end of the crankshaft is formed in the crankshaft that has a plurality of crank pins different in phase between adjacent ones at positions axially spaced, and which reduces a lubrication oil amount filled in the oil supply passage by setting the volume of the oil supply passage at the requisite minimum, reduces the lubrication oil amount required by the entire engine and prevents deterioration of lubricity caused by oil supply delay. SOLUTION: In the lubrication oil configuration of the crank shaft, the oil supply passage comprises a main oil supply passage section 149 which is comprised of a plurality of passage holes 149a, 149b, 149c, 149d obliquely intersecting the axes of the respective crank pins 16a-16c in the plane containing the axes of the respective crank pins 16a, 16b, 16c and the crankshaft 16, and a communication passage section 150 interconnecting the oil supply port 148 and the main oil supply passage section 149. COPYRIGHT: (C)2007,JPO&INPIT
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