| 摘要 |
At least part of upper surfaces of the transmission case and the crankcase is formed as a generally flat surface, on which the generator and the starting motor are arranged in end-to-end facing relation, with their drive shafts disposed parallel with the crankshaft, to thereby reduce the axial size of the engine. The generator is arranged close to the cylinders of the engine, and has a casing in which a forced-air cooling fan is mounted, and which has its peripheral wall provided with port means located at an upper portion and having a downwardly directed opening, and also provided with a through hole at a lower portion. The port means and the through hole are each adapted to effect suction or discharge of cooling air into or out of the casing.
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