Direct injection gasoline engine with stratified charge combustion and homogeneous charge combustion

摘要

A piston for an internal combustion gasoline engine having an injector (10) for injecting fuel directly into a cylinder, comprising a projection section provided at a top surface of the piston, a cavity combustion chamber recessed (12) in the projection section, wherein a pair of valve recesses (31,32) are recessed in the projection section superposed on the cavity combustion chamber and an arcuate dam section is formed along the periphery of the valve recesses, and an internal combustion gasoline engine provided with such a piston.