| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely lubricate a crank pin while ensuring easiness in working, and to also prevent the strength of a crankshaft from being reduced. <P>SOLUTION: Crank journals 7, 8 are held in a freely rotatable manner by bearing parts 17, 18 and bearing caps 4, 5 via a bearing 15. The crank arm 10 is bored with a first oil supply passage 26 in parallel with an axis line and a second oil supply passage 27 orthogonal to the axis line. A disc-shaped thrust metal 23 is mounted on a side face of the intermediate bearing part 18, and the disc-shaped thrust metal 23 is bored with an annular groove 24 communicating with the first oil supply passage 26 and a through-hole 25 making the annular groove 24 communicate with main oil supply passages 20, 21. Drilling of the oil supply passages 26, 27 can be easily performed, and therefore being superior in workability. <P>COPYRIGHT: (C)2013,JPO&INPIT |
