Importance

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Abstract

The invention concerns a combustion chamber delimited by a piston head having, inside a planar peripheral ring, a recess in the form of a concave bowl open towards the chamber and off-center on the piston axis (X--X) side which faces towards the injector inclined on the axis (X--X) and is laterally implanted on the cylinder head for direct injection into the chamber, and on the axis (X--X), a boss having, in layout, a horseshoe or crescent shape which partially enclosed the recess. The boss has an overhanging edge above the connection between the recess and the boss, whereof the upper surface is convex towards the chamber. The width of the overhanging edge is at its maximum in the horseshoe shaped boss base and gradually decreases until it substantially disappears at the tips of the two wings of the horseshoe-shaped boss, thereby ensuring a good preparation for the air/fuel mixture in the center of the chamber, opposite the axial plug at the chamber top. The invention is applicable to internal combustion engine with applied ignition and direct injection.

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First Claim