| 摘要 |
A main journal 25 a of a crank-shaped swinging shaft 25 which swings in a range of a predetermined angle is supported by bearing metals 51 and 52 each divided into two pieces. In supplying a lubrication oil through an oil bore 51 b in the bearing metal 51 to a sliding surface of the main journal 25 a and to inlet openings of lubrication oil passages P 1 and P 2 of the swinging shaft 25 open to the sliding surface, the inlet openings of the lubrication oil passages P 1 and P 2 of the swinging shaft 25 are designed so that they do not move past division portions 55 of the bearing metals 51 and 52 upon swing of the swinging shaft 25 in the range of the predetermined angle. Therefore, it is possible to prevent the lubrication oil to be supplied to the lubrication oil passages P 1 and P 2 from leaking from the division portions 55 of the bearing metals 51 and 52, thereby reliably lubricating a pin journal 25 b of the swinging shaft 25 by the lubrication oil supplied from the lubrication oil passages P 1 and P 2.
|
