Patent ID: 6318311
Filing Date: 2001-11-20
Classification: F02B,Y02T

Abstract:
A cylinder-injection type two-cycle combustion engine comprising a cylinder in said engine, a piston mounted for reciprocation in said cylinder, said piston having a top portion having a recessed portion, a fuel injector for directly injecting fuel into a combustion chamber defined by said piston and cylinder, a spark plug for igniting a mixture of fuel and air in said combustion chamber, an exhaust port provided in said cylinder to exhaust said cylinder upon a downward stroke of said piston, and a plurality of scavenging passages between a crank chamber and scavenging ports in said cylinder to direct air from said crank chamber to said combuBtion chamber, the top portion of the piston further having a raised portion with an inclination surface extending upwardly at an angle .alpha. from an outer periphery of the piston, at least a scavenging port near said exhaust port having a ceiling inclined upwardly at an angle of inclination .theta., said angle .theta. being less than the angle .alpha. of said inclination surface, whereby scavenged air at at least said scavenging port near said exhaust port follows a scavenging path so that the scavenged air blows directly onto the inclination surface.