Air-cooled four-stroke internal combustion engine
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United States of America Patent
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Aug 9, 2005
Grant Date -
Oct 21, 2004
app pub date -
Apr 21, 2004
filing date -
Apr 21, 2003
priority date (Note) -
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Abstract
The present invention provides an air-cooled four-stroke internal combustion engine capable of achieving a high degree of cooling. The present invention is directed to an air-cooled four-stroke internal combustion engine including a crankshaft and a fan rotor rotatably driven by the crankshaft to generate cooling air for cooling the engine. The engine comprises an oil pan disposed below the crankshaft. A space formed below the oil pan extends in the axial direction of the crankshaft along the lower surface of the oil pan and allows a cooling air to pass therethrough. An upstream portion of the lower surface is inclined upward, toward the upstream, in a vertical section taken along the axis of the crankshaft to receive the cooling air therein.
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