| 摘要 |
PURPOSE:To prevent the lowering of the rigidity of a crank shaft, by providing an oil path for leading a lubricating oil fed onto the bearing face at a crank journal section to an oil sump at the crank bin section in a crank journal section at the side where the load is not applied. CONSTITUTION:An oil path 19 for coupling between a journal section bearing face and an oil sump 18 at the center of a crank pin section 81 is opened to a core section of a crank journal section 83R at the side not applied with the weight. Said oil sump 18 and the outercircumferential face of the crank pin 81 or the bearing face of a conrod end section are conducted with a plurality of small radial oil paths 20. The lubricating oil is fed by a pump through an oil path 21 from other section of an engine to the bearing face of the left and right crank journal sections 83L, 83R. |
