Patent ID: 7980205

Claim:
An air-cooled engine that is cooled by cooling air, the engine comprising: a cylinder block that comprises a cylinder having a reciprocating piston; and a cylinder head provided to a distal end of the cylinder block; wherein: the cylinder block comprises at least one cylinder-cooling through-duct capable of transmitting the cooling air, on the periphery of the cylinder; the cylinder head comprises at least one head-cooling through-duct capable of transmitting the cooling air; and the cylinder-cooling ducts and the head-cooling duct extend in a direction perpendicular to the axial line of the cylinder, and are communicated with each other by means of at least one communicating channel formed on the cylinder block and the cylinder head, wherein the cylinder head comprises a valve chamber for accommodating a camshaft that operates an intake valve and an exhaust valve, and a guide-cooling duct communicated with the head-cooling duct, and the camshaft is driven by a crankshaft via a power transmission mechanism disposed along the cylinder, and wherein top inlets of the cylinder-cooling duct and the head-cooling duct are provided on the side of the power transmission mechanism, and an inlet for the guide-cooling duct is formed in the cylinder head on the side opposite from the power transmission mechanism.