초록 ▼

In an internal combustion engine, an injection hole is provided in the cylinder head to inject narrow streams of air towards the spark gap, particularly during idling and low load running conditions. The injected air is 5 to 30% by weight of the intake fuel-air mixture provided via the intake manifo

In an internal combustion engine, an injection hole is provided in the cylinder head to inject narrow streams of air towards the spark gap, particularly during idling and low load running conditions. The injected air is 5 to 30% by weight of the intake fuel-air mixture provided via the intake manifold and creates a swirl or turbulence thereby increasing combustibility. The hole is connected via a sub intake passage to the main air intake passage upstream of the venturi in the carburetor or between the venturi and throttle valve.

대표청구항 ▼

In an internal combustion engine of the type having; a single combustion chamber having an intake porT and an exhaust port; a main intake passage for introducing into said intake port an air-fuel charge mixture produced in a mixture charge producing device; a throttle valve disposed in said main int

In an internal combustion engine of the type having; a single combustion chamber having an intake porT and an exhaust port; a main intake passage for introducing into said intake port an air-fuel charge mixture produced in a mixture charge producing device; a throttle valve disposed in said main intake passage; a spark plug threaded in a wall of a cylinder head, with a spark gap thereof located in a given position within said combustion chamber; and a piston operating within a cylinder block attached to said cylinder head; the improvement characterized by: (a) an injection hole open in said wall of said cylinder head constituting said combustion chamber, said injection hole directed to the vicinity of the spark gap in said wall to obtain a high speed jet flow having a directional characteristic; (b) a sub-intake passage connected to said injection hole; (c) means for supplying gas to said sub-intake passage under a sufficient gas-supplying pressure by high level vacuum generated within said combustion chamber even during the low-load running condition of said engine when the opening of said throttle valve is small; (d) a sub-intake valve provided in said cylinder head for opening and closing said sub-intake passage; and, (e) an actuating mechanism for opening said sub-intake valve during a suction stroke whereby a high speed gas is injected with strong force from said injection hole into said combustion chamber to remove the combustion gas existing around the spark gap and promote a swirling action and turbulence of said air-fuel mixture.