Two-cycle combustion engine having two-staged piston

Details Two-cycle combustion engine having two-staged piston Two-cycle combustion engine having two-staged piston

2005-05-24

2005-05-24

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Two-cycle

Rear compression

Reexamination Certificate

active

06895909

ABSTRACT:
A two-cycle combustion engine with a two-staged piston addresses a blow-off phenomenon of an air-fuel mixture. A cylinder block has a two-staged cylinder bore with a reduced diameter bore portion and a large diameter bore portion, and a two-staged piston having a reduced diameter piston portion and a large diameter piston portion. An annular auxiliary chamber is defined between the cylinder bore and the two-staged piston. An air passage introduces air mixed with oil into a crank chamber. An air-fuel mixture passage introduces the air-fuel mixture into the auxiliary chamber. A scavenge air passage supplies the air within the crank chamber into a combustion chamber, and an injection passage injects the air-fuel mixture within the auxiliary chamber into the combustion chamber from an inner peripheral surface of the cylinder block in a direction oriented substantially diagonally upwardly.

REFERENCES:
patent: 4481909 (1984-11-01), Takada et al.
patent: 6418891 (2002-07-01), Kobayashi
patent: 2259549 (1993-03-01), None
patent: 57-45890 (1992-09-01), None
patent: 05-118225 (1993-05-01), None

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