Four-stroke cycle internal combustion engine

Details Four-stroke cycle internal combustion engine Four-stroke cycle internal combustion engine

1998-03-03

1999-11-30

Kamen, Noah P.

Internal-combustion engines

Four-cycle

Crankcase compression of air or combustible mixture to be...

123311, F02B 7502, F02B 7512

Patent

active

059923750

ABSTRACT:
The present invention provides a small and light four-stroke cycle internal combustion engine applicable to a compact power working machine. A cylinder head is provided with an ignition plug and an exhaust port with an exhaust valve. A crankcase is fixed to the bottom of a cylinder block are to form a closed crank chamber. On the cylinder block formed are a first port and a second port which are open to a combustion chamber and are opened and closed by a piston, with the second port being communicated with the crank chamber through a communicating passage, the first port being connected to a carburetor, and an air-fuel mixture mixed with lubricating oil being supplied from the carburetor through this first port to the crank chamber.

REFERENCES:
patent: 4995350 (1991-02-01), Kumagai et al.
patent: 5579735 (1996-12-01), Todero et al.
patent: 5586523 (1996-12-01), Kawahara et al.

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