STRATIFIED CHARGE COMBUSTION METHOD FOR INTERNAL COMBUSTION ENGINE BY REFORMING INTAKE VALVE

PROBLEM TO BE SOLVED: To develop an internal combustion engine capable of achieving energy-saving and low-emission performance for the internal combustion engine, and using a wide variety of fuels by converting an intake-air combustion method for the internal combustion engine of a spark-ignition type into a stratified charge combustion method by reforming an intake valve.SOLUTION: An air-intake flow of a main intake valve is laterally oriented so as to first achieve internal cooling performance for an ignition plug and an electrode forming a vertical tumble flow toward a downward piston part through a cylinder wall on the side of an exhaust valve and converting a flow from a sub-intake valve into a lateral flow along a cylinder wall surface. Thus, the performance wherein a flow direction is controlled forming a circling swirl flow or the like is achieved by valve lift control with a structure wherein a control means of the intake air flow of each intake valve is configured by combining the intake valve and an annular valve seat so that an almost half area of the annular valve seat is different from the other in flow resistance reforming stratified charge combustion of a wide variety of fuels through a directive supply method for air and an air-fuel mixture by a high compression ratio of an internal-combustion engine of a spark-ignition type. Combustion technology as described above is provided.