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

2005-08-30

2005-08-30

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Two-cycle

Rear compression

Reexamination Certificate

active

06935285

ABSTRACT:
A two-cycle combustion engine having a two-staged piston, is simple in structure and inexpensive and addresses a undesirable blow-off phenomenon of the air-fuel mixture. The two-cycle combustion engine includes a cylinder block having 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 two-staged cylinder bore and the reduced diameter piston portion. The two-cycle combustion engine also includes an air-fuel mixture passage for introducing the air-fuel mixture into a crank member, an air passage for introducing air into the auxiliary chamber, a scavenge passage for supplying the air-fuel mixture within the crank chamber into a combustion chamber, and injection passages and for injecting the air within the auxiliary chamber into the combustion chamber to counter a press-out issue.

REFERENCES:
patent: 4068629 (1978-01-01), Hooper
patent: 4478180 (1984-10-01), Fujikawa et al.
patent: 4481909 (1984-11-01), Takada et al.
patent: 5261358 (1993-11-01), Rorke
patent: 5797359 (1998-08-01), Freeman
patent: 57-45890 (1992-09-01), None
patent: 05-118225 (1993-05-01), None

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