Patent ID: 6338327
Filing Date: 2002-01-15
Classification: F02B,F02F,Y02T

Abstract:
In-cylinder fuel injection engine having a cylinder, a piston movably disposed in said cylinder for reciprocal motion, a cylinder head secured over said cylinder and piston to form a combustion chamber, an exhaust port, a booster port disposed on an opposite side of said exhaust port with respect to a cylinder bore center axis to strengthen a scavenging flow of fresh air, a plurality of scavenging ports, a spark plug mounted in said cylinder head and a fuel injector mounted in said cylinder head to inject fuel into said cylinder, said engine comprising:a piston cavity shaped into a concave spherical surface and disposed on a top surface of said piston such that a center of said piston cavity is located approximately on a first plane defined by a center of said exhaust port and said cylinder bore center axis and in an offset position on an exhaust port side; a combustion chamber dome disposed opposite to said piston cavity at a back surface of said cylinder head; an electrode of said spark plug positioned in a vicinity of said cylinder bore center axis; and an injection nozzle of said fuel injector positioned approximately at a point of intersection of said first plane and an outer periphery edge line of said dome, said point existing at a side of said exhaust port.