Internal-combustion engines – Cooling – Air-cooled
Patent
1993-07-23
1995-06-06
Kamen, Noah P.
Internal-combustion engines
Cooling
Air-cooled
1231935, F02F 106
Patent
active
054212928
ABSTRACT:
A small four cycle internal combustion engine is disclosed having a cylinder head assembly which comprises a cylinder head cooperating with a cylinder block of the engine, and a rocker box connected to the cylinder head so as to define an air passage therebetween through which air may pass. The cylinder head has cooling fins projecting into the air passage between the cylinder head and the rocker box and aligned generally transversely to a line extending between the axes of the intake and exhaust valves. The air passage preferably extends between an intake port and an exhaust port of the engine, and above an exhaust gas recirculation port extending between the intake and exhaust ports. A pair of push rod tubes are integral with the rocker box and extend between the rocker box and a crankcase of the engine externally of the cylinder block. The engine of the present invention also includes a cam tower assembly comprising a base member and a pair of parallel shafts extending from the base member. One of the shafts functions as a camshaft and has a unitary cam gear and cam rotatably supported thereon. The other shaft is a follower shaft and has a pair of cam followers rotatably supported thereon.
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"The Little Engine That Could," Popular Science (Mar., 1993) p. 90.
Everts Robert G.
Hoffman Ronald J.
Kamen Noah P.
Ryobi Outdoor Products
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