Patent ID: 6220215
Filing Date: 2001-04-24
Classification: F02B,F02F,Y02T

Abstract:
A combustion chamber structure in an internal combustion engine wherein a spark plug is disposed at a nearly central position of a combustion chamber formed between an underside of a cylinder head and a crown of a piston, intake valves are disposed on one side of said cylinder head and exhaust valves are disposed on the other side of said cylinder head, and the piston is joined to a connecting rod by a coupling hinge pin so that the piston has a slap direction which extends perpendicular to the coupling pin, the intake and exhaust valves being disposed on opposite sides of the coupling pin so as to be spaced along the slap direction, the improvement comprising a recess formed in said piston crown and elongate in the slap direction for connecting said intake and exhaust valves, the recess having a generally rectangular bottom, the recess being formed at ends thereof in the slap direction by end walls which project upwardly for connection to said piston crown with said end walls being spaced inwardly from the periphery of the piston crown to form squish flows at both ends of the recess between the recess end walls and the periphery of the piston crown.