US 4,399,778 AGranted

Two cycle internal combustion engine

OwnerAntonio Anchetainventor

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Abstract

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 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 valve. The valve is operated by a cam mounted on a cam shaft upon the cylinder head which in turn is operatively connected to the crankshaft. 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.degree. and with the piston controlling the opening of the exhaust port through approximately 130.degree. so that there is approximately a 5.degree. overlap at either end of the exhaust port opening. 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.

Claims17

Dependent claims

A two-stroke supercharged multi-cylinder internal combustion engine, with inline or V-type configuration and including a pressure lubrication system;

comprising in combination a cylinder block having cylinder bores formed therein, a cylinder head on the upper end of the cylindrical bores and closing same and defining a combustion chamber at the upper end of each cylindrical bore, a piston assembly in each of said bores including a piston having a domed head and a connecting rod operatively connected to said piston for reciprocating same between top dead centre and bottom dead centre, a crankshaft mounted for rotation at the base of said block, said connecting rods being operatively connected to said crankshaft and an oil pan enclosing the lower end of the cylinder bores and said crankshaft, said cylinder head including a cam shaft mounted for rotation thereon and being operatively connected to said crankshaft, at least one inlet-and-scavenger valve mounted on said cylinder head and being operatively connected with said combustion chamber of each of said cylindrical bores, a rocker arm operatively mounted on said cylinder head and operatively engaging said inlet-and-scavenger valve by one end thereof, a cam lobe for each rocker arm formed on said cam shaft operatively connected with the other end of said rocker arm, said cam lobes having a relatively wide area of contact with said rocker arm to control the opening, closing and duration of opening of said inlet-and-scavenger valve and exhaust port located in the lower side of the cylinder walls of the cylinder bores inclining downwardly and outwardly through the cylinder walls and being covered and uncovered by the reciprocating piston passing thereby.

Dependencies are inferred from the claim text.