Non-polluting two-stroke engine with air-cooled piston

Details Non-polluting two-stroke engine with air-cooled piston Non-polluting two-stroke engine with air-cooled piston

2011-03-01

2011-03-01

Cuff, Michael (Department: 3741)

Internal-combustion engines

Two-cycle

Rear compression

C123S0650BA, C123S0650BA, C123S193100, C123S193600, C123S193200, C092S172000, C092S255000

Reexamination Certificate

active

07895978

ABSTRACT:
A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a piston slip-fit in the cylinder, the piston having an upper portion and a lower portion and a central portion of significantly less than the bore diameter, providing an annular space between the central portion and the cylinder wall, and an air pump providing air to one or more intake ports, wherein for a significant portion of every stroke both one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports.

REFERENCES:
patent: 1180947 (1916-04-01), Scott
patent: 1297350 (1919-03-01), Hinchliffe
patent: 1619460 (1927-03-01), Cage
patent: 1632984 (1927-06-01), Riehm
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patent: 2224229 (1940-12-01), Miller
patent: 2359672 (1944-10-01), Penco
patent: 2497781 (1950-02-01), Logashkin
patent: 2746446 (1956-05-01), Laubender
patent: 4282837 (1981-08-01), Holtman et al.
patent: 4969425 (1990-11-01), Slee
patent: RE34143 (1992-12-01), Rao et al.

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