Air-cooled four-stroke internal combustion engine

Details Air-cooled four-stroke internal combustion engine Air-cooled four-stroke internal combustion engine

2005-08-09

2005-08-09

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Cooling

Air-cooled

C123S1950HC, C123S041700, C123S1960AB

Reexamination Certificate

active

06925970

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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patent: 10077835 (1998-03-01), None
patent: 2001-207817 (2001-08-01), None
patent: 2002371846 (2002-12-01), None

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