SPARK IGNITION ENGINE

摘要

PURPOSE:To accelerate the combustion speed for reducing a thermal loss by shaping a combustion chamber at the piston head in the specific recessed form and disposing an ignition plug on the cylinder side so that the position of plug faces the outer rim of the recess. CONSTITUTION:A combustion chamber at the head of a piston 5, namely a cavity 6 is shaped in such a form that its depth is gradually reduced in the radial direction from the center of the piston 5 to the outside, thereby producing shearing turbulene in the swirl generated during the combustion stroke. An ignition plug 7 is disposed on the cylinder side to be opposed to the peripheral rim of the cavity 6 so as to prevent the thermal pinch.