| 摘要 |
PROBLEM TO BE SOLVED: To prevent a crank shaft from being broken and a main bearing from bring damaged by reducing the dimensions on a power take-out side of the crank shaft as much as possible, and to reduce the cost by omitting a lubrication ring itself. SOLUTION: A pressure feed oil path 20 is formed on a flywheel 3 side in a crank case 1 of a horizontal engine, pin lubrication oil paths 22, 23 are formed in a crank shaft 10, and a oil supply ring groove 21 is formed in the vicinity of a bearing boss part 16 to pivotably support a main spindle journal of the crank shaft 10. The oil supply ring groove 21 is integratedly formed with the bearing boss part 16 in which a main bearing 15 of the main spindle journal is fitted, and the pressure feed oil path 20 is communicated with the pin oil supply paths 22, 23 through the lubrication ring groove 21.
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