Patent ID: 6581553
Filing Date: 2003-06-24
Classification: F02B,F02F,Y02T

Abstract:
A two-stroke engine comprising:a cylinder block defining a cylinder; a piston reciprocally movable within said cylinder; a cylinder head which together with said piston and said cylinder defines a combustion chamber; an in-cylinder injector provided in said cylinder head; a curved concave formed on a top surface of said piston; at least one scavenging port including a first scavenging port which extends toward an inner side wall of said cylinder at a first side with respect to a reference plane passing through a center axis of said cylinder, and which is formed in said cylinder head to have an opening end adapted to be opened to said combustion chamber at said first side with respect to said reference plane for generating a tumble flow toward the top surface of said piston; and an exhaust port formed in said cylinder block to be opened to said cylinder at a second side with respect to said reference plane in accordance with reciprocal movement of said piston; wherein injection timing of said in-cylinder injector is set such that a mist flow emitted from said in-cylinder injector arrives at a slightly inner side of an outer edge of said curved concave of said piston when said piston closes said exhaust port at an earliest injection timing.