Two cycle internal combustion engine

Details Two cycle internal combustion engine Two cycle internal combustion engine

F - Mech Eng,Light,Heat,Weapons

02

B

171/22

F02B 33/22 (2006.01) F02B 25/04 (2006.01) F02B 29/06 (2006.01) F02B 33/38 (2006.01) F02B 37/04 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1206102

-26- HIGH TORQUE TWO-STROKE DIESEL ENGINE ABSTRACT OF THE DISCLOSURE A two-stroke engine includes an intake-and-scavenge valve in the cylinder head together with a fuel injection system, a recirculating type pressure lubricating system, and a blower or turbo charger 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 to- wards the exhaust port formed through the wall of the cylin- der above the bottom dead centre 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 valve. The valve is operated by a cam mounted on a cam shaft upon the cylin- der head which in turn is operatively connected to the crank shaft. The width of the cam lobe is such that the opening, closing and duration of opening of the valve is controlled with the valve being opened approximately 140° and with the piston controlling the opening of the exhaust port through approximately 130° so that there is approximately a 5° over- lap at either end of the exhaust port opening. It should be noted that the oil scraper ring remains below the exhaust -27- port at all times to prevent lubricating oil from escaping through the exhaust port.

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