Spark ignition type internal combustion engine with sub-combustion

Abstract

A spark ignition internal combustion engine includes a sub-combustion chamber in which gas mixture with an air-fuel ratio adapted for an operating state of the engine over a wide operating range of the engine is supplied to a combustion chamber. The amount of hydrogen carbide discharged is less and a high efficiency can be attained. The sub-combustion chamber of the internal combustion engine communicates with the main combustion chamber. Gas mixture injecting apparatus intermittently injects gas mixture into the sub-combustion chamber. Ignition devices are arranged in the sub-combustion chamber. The engine is constructed such that the sub-combustion chamber is eccentric in a sideward direction from an extending line of injecting direction of the gas mixture injecting apparatus and communicated with the main combustion chamber. The gas mixture injecting apparatus includes a pressure accumulating chamber adjacent to the sub-combustion chamber and to which pressure air is filled, the opening or closing valve to cause the pressure accumulating chamber to be communicated with the sub-combustion chamber in such a way that they may be opened or closed, and the fuel injecting valve for injecting fuel to the pressure accumulating chamber.