Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1988-12-12
1989-11-07
Kyle, Deborah L.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
F02B 2504
Patent
active
H00007013
ABSTRACT:
A two-stroke engine includes an intake-and-scavenge valve in the cylinder head together with a gasoline fuel injection system, a recirculating type constant pressure lubricating system, and a blower or turbo charger combination assisting in charging the cylinder with air and also assisting in scavenging the exhaust gases. The piston head is domed with one side curving downwardly towards the exhaust port formed through the wall of the cylinder above the bottom dead center position of the piston head. The exhaust port slopes outwardly and downwardly following generally the slope of the piston to facilitate the flow of exhaust gases therethrough assisted by the scavenging air entering through the inlet-and-scavenger valves. The valve is operated by a cam mounted on a camshaft upon the cylinder head which in turn is operatively connected to the crankshaft. The shape of the cam lobe is such that it controls the opening, closing and duration of opening of the valve with the valve being opened approximately 153.degree. and with the piston controlling the opening of the exhaust port through approximately 160.degree.. The inlet valves open approximately 10.degree. after the exhaust port opens and closes approximately 3.degree. after the exhaust port is covered. It should be noted that the oil scraper ring remains below the exhaust port at all times to prevent lubricating oil from escaping through the exhaust port. In gasoline engines, metered, atomized gasoline fuel is injected by fuel injectors installed at the scavenging valve ports a few degrees before the scavenging valves close. The atomized fuel is mixed with the fresh air charge entering the cylinder to be compressed.
REFERENCES:
patent: 4399778 (1983-08-01), Ancheta
patent: 4576126 (1986-03-01), Ancheta
Carone Michael J.
Kyle Deborah L.
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