Patent ID: 8881706
Filing Date: 2014-11-11
Classification: F02B,Y02T

Abstract:
1. A piston for an internal combustion engine, comprising: a body laterally delimited by a skirt configured to collaborate with walls of a cylinder of axis of revolution (C) in which the piston can slide along the axis (C), the piston comprising a transverse face that comprises a central pip, a peripheral crown ring, and a bowl of axis of revolution (B) that extends from the central pip toward the peripheral crown ring to which it is connected at a lip of thickness (Ep), the bowl comprising, substantially in vertical alignment with the lip, a torus in profile, or half-dome shaped, of maximum radius (Rt), configured to guide a fuel injected under the lip in a re-entrance zone (R) toward the central pip, wherein the top of the central pip includes a flattened zone centered on the axis of revolution (B) of the bowl and of a width (Lt) of between greater than 0 mm and 5 mm, and the flattened zone extends from a first corner located between greater than 0 mm and 2.5 mm from the axis of revolution (B) of the bowl in a first direction to a second corner located between greater than 0 mm and 2.5 mm from the axis of revolution (B) of the bowl in a second direction opposite to the first direction, and wherein the top of the pip situated on the axis of revolution (B) of the bowl rises up to a height that is a distance (Dt) of between 5.4 mm and 7 mm below the peripheral crown ring.