| 摘要 |
PROBLEM TO BE SOLVED: To increase a quantity of air fed by a centrifugal cooling fan and feed cooling air sufficeintly even to a crank case behind a flywheel. SOLUTION: A plurality of vanes 8 are radially arranged on a main plate 7 of a centrifugal cooling fan 6. The main plate 7 is fixed on one end face of a flywheel of an engine in a state that it is overlapped on the same shaft. The vane 8 is extended so as to protrude in the centrifugal direction more than a peripheral fringe of the main plate 7. Since the vane 8 protrudes in the centrifugal direction more than the peripheral fringe of the main plate 7 of the cooling fan 6, the vane 8 is enlarged by an amount of the protruding vane part 8a and a quantity of air fed increases. Moreover, it is possible to suppress an increase of engine dimension in the axial direction of the cooling fan 6. Consequently, the increase of the quantity of air fed and miniaturization of the engine are compatible.
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