Two-stroke internal combustion engine

Details Two-stroke internal combustion engine Two-stroke internal combustion engine

1989-11-22

1991-08-20

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65W, F02B 7532

Patent

active

050404962

ABSTRACT:
In known two-stroke internal combustion engines with piston-controlled intake passages for the fresh charge and one or more exhaust passages for the exhaust gases, the actual direction of flow will deviate from the theoretical flow direction defined by the passage walls because of the influence exerted by the piston edge. The scavenge flow is deflected in the direction of the exhaust passage and the cylinder head, which will cause increased losses of fresh charge. This will considerably lower scavenge efficiency, and thus lead to a marked deterioration of engine performance, fuel consumption and exhaust emission. In the invention these disadvantages are avoided by aligning the flow guide vanes such that they form an angle, preferably of 90.degree., thus acting as a flow director.

REFERENCES:
patent: 1176096 (1916-03-01), Richter et al.
patent: 2016344 (1935-10-01), Simmen
patent: 2137344 (1938-11-01), McCarthy
patent: 2244453 (1941-06-01), Fottinger et al.
patent: 2406404 (1946-08-01), Ryde
patent: 2756731 (1956-07-01), Wille
patent: 2778348 (1957-01-01), Percival
patent: 4373474 (1983-02-01), Schindler et al.

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