Patent ID: 6129065
Filing Date: 2000-10-10
Classification: F02B,F02F,Y02T

Abstract:
A piston for a cylinder injection engine comprising:a combustion chamber defined by a lower surface of a cylinder head, a cylinder liner, and a top face of a piston;an injection valve disposed in the vicinity of an intake port of said engine and adapted to inject fuel into said combustion chamber;a spark plug disposed closer to the center portion of said combustion chamber than said injection valve; anda depression formed in the top face of said piston such that said depression substantially faces said injection valve and said spark plug, whereinsaid depression is formed such that a first curved surface located substantially below said spark plug and a second curved surface located substantially below said injection valve are composed of different curvatures;the curvature of said first curved surface is set larger than that of said second curved surface;a connection portion defining a shortest portion of said depression connecting said first curved surface and said second curved surface; anda volume of said depression being set to enable stratified combustion, while securing sufficient power.