| 摘要 |
An oil pan-coupled surface 115 formed on a lower surface of an engine block 11 having a crankshaft 15 supported to be directed vertically is extended below a cylinder head 12 beyond a line L extending downwards from a cylinder head-coupled surface 11 4 formed on a rear surface of the engine block 11. Thus , it is possible to increase the area of the oil pan-coupled surface 11 5 without interference with the cylinder head-coupled surface 11 4, and to increase the volume of an oil pan 41 1 coupled to the oil pan-coupled surface 11 5. Moreover, the cylinder head-coupled surface 11 4 and the oil pan-coupled surface 11 5 are not continuous with each other and hence, there is no possibility that the sealing of the coupled surfaces 11 4 and 11 5 may be impeded.
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