| 摘要 |
PROBLEM TO BE SOLVED: To efficiently return oil into an oil pan by letting the oil, which turns with the rotation of a crank shaft, flow into a bottom part of a crank chamber smoothly after a bearing part in the crank shaft is lubricated in an outboard motor engine. SOLUTION: In an outboard motor engine, respective cylinders are arranged in the vertical direction so that a crank shaft 26 is arranged in the vertical direction, and in a crank chamber 25 dividedly formed of a cylinder block 15 and a crank case 16, journal bearing parts 70 are arranged in the vertical direction at certain intervals, so that the crank shaft 26 is clamped between a half type bearing component 71 formed on the cylinder block side and a half type bearing component 72 formed on the crank case side. In this case, toward the bearing component 72 on the crank case side in each journal bearing part 70 inside the crank chamber 25, oil return holes 74 connected to each other in the vertical direction are formed in the vicinity of a wall part of the crank case 16 facing the cylinder. |
