2-cycle uni-flow spark-ignition engine

Details 2-cycle uni-flow spark-ignition engine 2-cycle uni-flow spark-ignition engine

1989-09-12

1991-02-26

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 9014, F02B 7502

Patent

active

049953508

ABSTRACT:
A 2-cycle uni-flow spark-ignition engine has an annular scavenging chamber which is communicated with a crank chamber and which is connected to scavenging ports which are opened in an end period of downward stroking of a piston. A fluid introduced into the crank chamber is pre-compressed by the downward stroking of the engine and is discharged into a cylinder chamber through the annular scavenging chamber and the scavenging ports to form a uni-flow of scavenging fluid with a swirl above the piston. The engine has an exhaust valve provided on a cylinder head and normally opened by being driven with a predetermined force exerted by driving coiled spring towards the inside of the cylinder chamber. The exhaust valve is closed in the beginning period of compressing upward stroking of the piston so as to allow compression of the mixture introduced into the cylinder chamber and is automatically opened at the end period of expansion downward stroking of the piston after explosion and generation of power, so as to enable the combustion gas to be discharged as exhaust gas.

REFERENCES:
patent: 1361109 (1920-12-01), Spohrer
patent: 1438915 (1922-12-01), Howe
patent: 1540286 (1925-06-01), Roberts
patent: 2262089 (1941-11-01), Brakmeier
patent: 2816532 (1957-12-01), Ratliff
patent: 3289658 (1966-12-01), Surovek
patent: 4592313 (1986-06-01), Speckhart
patent: 4682570 (1987-07-01), Velencei et al.

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