Two-stroke, multicylinder, spark ignition, pumpless injection internal combustion engine

Claim 2

A two stroke pumpless fuel injection internal combustion engine comprising: a first and second cylinder each having a piston therein and each defining a working space in which said pistons move up and down, a precombustion chamber connected to the working space of said first cylinder, a connecting duct connecting the respective working space of said first and second cylinders, an injection port in said first cylinder at one end of said connecting duct and an ejection port in said second cylinder at the other end of said connecting duct, said connecting duct being positioned in such a way that its axis of symmetry is directed towards said precombustion chamber, a spark plug whose sparking end is in said precombustion chamber and is within the area defined by the injection stream of the fuel being directed into said precombustion chamber, and fuel supply means for supplying fuel to said connecting duct inbetween said injection and ejection ports, said fuel supply means comprising a valveless metering chamber with a capacity greater than the maximum charge of fuel needed for one working cycle, said metering chamber being connected to said connecting duct and to a fuel feeding duct for preventing uncontrolled receiving of fuel from the fuel feeding duct.

Claim 3

An internal combustion engine as claimed in claim 1 wherein said connecting duct substantially the same bore throughout its length and said fuel supply means cmprises inlet and outlet ducts leading to and from said metering chamber and each of a diameter less than one half of the bore of said connecting duct, said outlet duct being connected to said connecting duct.

Claim 4

An internal combustion engine as claimed in claim 1 wherein said injection port of said first cylinder and said ejection port of said second cylinder are both located in the cylinder wall above the piston midstroke and at the same distance from the piston top dead centers.

Claim 5

A two stroke pumpless fuel injection internal combustion engine comprising: a first and second cylinder each having a piston therein and each defining a working space in which said pistons move up and down, a precombustion chamber connected to the working space of said first cylinder, a connecting duct connecting the respective working spaces of said first and second cylinders, an injection port in said first cylinder at one end of said connecting duct and an ejection port in said second cylinder at the other end of said connecting duct, said connecting duct being positioned in such a way that its axis of symmetry is directed towards said precombustion chamber, a spark plug whose sparking end is in said precombustion chamber and is within the area defined by the injection stream of the fuel being directed into said precombustion chamber, and fuel supply means for supplying fuel to said connecting duct inbetween said injection and ejection ports, said injection port widening in the proximity of the inside surface of said first cylinder, said widened portion of said injection port forming a set off which can collect oil which has been scraped from the cylinder wall by the piston, the edges of said inlet port being rounded off at the entrance to the connecting duct.

Claim 6

A two stroke pumpless fuel injection internal combustion engine comprising: a first and second cylinder each having a piston therein and each defining a working space in which said pistons move up and down, a precombustion chamber connected to the working space of said first cylinder, a connecting duct connecting the respective working spaces of said first and second cylinders, an injection port in said first cylinder at one end of said connecting duct and an ejection port in said second cylinder at the other end of said connecting duct, said connecting duct being positioned in such a way that its axis of symmetry is directed towards said precombustion chamber, a spark plug whose sparking end is in said precombustion chamber and is within the area defined by the injection stream of the fuel being directed into said precombustion chamber, and fuel supply means for supplying fuel to said connecting duct inbetween said injection and ejection ports, said injection port widening in the proximity of the inside surface of said first cylinder, said widened portion of said injection port forming a set off which can collect oil which has been scraped from the cylinder wall by the piston, the edges of said inlet port being rounded off at the entrance to the connecting duct.