Portable 4-cycle engine and portable machine equipped with...

Details Portable 4-cycle engine and portable machine equipped with... Portable 4-cycle engine and portable machine equipped with...

2006-08-28

2008-03-11

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Cooling

Air-cooled

C123S041690

Reexamination Certificate

active

07341027

ABSTRACT:
A portable 4-cycle engine with a configuration which allows cooling air to flow in the direction of the crankshaft relative to a cylinder head on a cylinder, and a portable machine equipped with this engine, are provided, respectively. In such an engine, the cylinder is separated from the cylinder head including a combustion chamber formed at the cylinder side therein. The engine further comprises a valve train area formed in the cylinder head at the downwind side of the cooling air, and a plurality of vertical fins protruding upward from the cylinder head and extending in the direction of the crankshaft. The valve train area and the plurality of vertical fins are all integrally formed with the cylinder head, so that the cylinder head can be made thinner and lighter with high rigidity to enable the portable machine to become smaller, lighter, and more powerful.

REFERENCES:
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patent: 2985155 (1961-05-01), Hockel
patent: 4216746 (1980-08-01), Freyn
patent: 5564374 (1996-10-01), Hoffman et al.
patent: 5588408 (1996-12-01), Kurihara
patent: 5606944 (1997-03-01), Kurihara
patent: 6039020 (2000-03-01), Kawamoto et al.
patent: 60-5774 (1985-02-01), None
patent: 3159296 (2001-02-01), None

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