Two-stroke internal combustion engine

Details Two-stroke internal combustion engine Two-stroke internal combustion engine

2007-08-14

2007-08-14

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Two-cycle

Rear compression

C123S0730FA

Reexamination Certificate

active

11438988

ABSTRACT:
In a two-stroke internal combustion engine (1) using an internal cooling piston (2), the piston (2) has in-piston scavenging passages (19) defined therein by partition walls (18), and lower-end inlets (20) of the in-piston scavenging passages (19) are opened downward and narrowed in opening area by piston pin bosses (16). In-cylinder scavenging passages (14), which are opened and closed as the piston (2) moves, are supplied with an air-fuel mixture from the narrowed lower-end inlets (20) through the in-piston scavenging passages (19). Thereby, a fresh air-fuel mixture is increased in flow rate when flowing from the in-cylinder scavenging passages (14) to the combustion chamber (10), and the scavenging efficiency of the engine is improved.

REFERENCES:
patent: 2003/0051684 (2003-03-01), Laydera-Collins
patent: 2002276377 (2002-09-01), None

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