System for a two-stroke crankcase scavenged combustion engine

Details System for a two-stroke crankcase scavenged combustion engine System for a two-stroke crankcase scavenged combustion engine

2008-06-24

2008-06-24

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Additional air supply

C123S0730PP, C123S586000, C123S0730AE, C261S023200

Reexamination Certificate

active

07389754

ABSTRACT:
The present invention relates to a system (1) for supplying an air-fuel mixture to a two-stroke internal combustion engine cylinder (2), comprising a carburettor (3) having a throttle valve (4) and usually a choke valve. The system further has a transfer passage (6) between a crankcase chamber and a combustion chamber of said engine. A supply conduit for additional air (8) is having an air valve (10) for said additional air, and said supply conduit for additional air (8) is being adapted to discharge the additional air into the top portion of said transfer passage (6) during a portion of a cycle of said two-stroke internal combustion engine. Further the air valve (10) is controlled by the throttle valve (4) so as to affecting a air valve opening state when said throttle valve opening state is affected. Said air valve (10) is of a barrel valve type while said throttle valve (4) is of a butterfly valve type.

REFERENCES:
patent: 4966104 (1990-10-01), Hundleby
patent: 6328288 (2001-12-01), Gerhardy
patent: 6708958 (2004-03-01), Warfel et al.
patent: 2003/0213464 (2003-11-01), Geyer et al.
patent: 2007/0181084 (2007-08-01), Holmdahl
patent: 20119880 (2002-04-01), None
patent: 0997621 (2000-05-01), None
patent: 1041267 (2000-10-01), None
patent: 2004005692 (2004-01-01), None

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