Low emission two cycle engine using two segment piston

Details Low emission two cycle engine using two segment piston Low emission two cycle engine using two segment piston

1997-06-24

1999-01-12

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 73PP, 123 586, F02B 3314

Patent

active

058574506

ABSTRACT:
An internal combustion engine is provided with a top hat piston disposed in a cylinder having first and second portions of different diameters. The piston, with first and second portions of different diameters, is disposed within the cylinder and defines a compression chamber between a cylinder step and a piston step created by the different diameters. The compression chamber is connected in fluid communication with a fuel supply, such as a carburetor or fuel injector, which provides a fuel/air mixture into the compression chamber during the downstroke of the piston. When the piston is moving upward, it compresses the fuel/air mixture within the compression chamber until a second end of a transfer passage is moved into fluid communication with a transfer port formed in the wall of the first portion of the cylinder. This occurs after the exhaust port is closed by the piston and therefore significantly diminishes the chance for unburned fuel to pass directly out the exhaust port from the combustion chamber.

REFERENCES:
patent: 1452011 (1923-04-01), Watton
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patent: 4138971 (1979-02-01), Fujikawa
patent: 4169434 (1979-10-01), Guenther
patent: 4210108 (1980-07-01), Hooper
patent: 4522163 (1985-06-01), Hooper
patent: 5189995 (1993-03-01), Hooper
patent: 5261358 (1993-11-01), Rorke
"Hooper's Hope" by Dave Searle and Doug Jackson, Oct. 1996, Motorcycle Consumer News; pp. 8-9.

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