Patent ID: 9027529
Filing Date: 2015-05-12
Classification: F02B,F02F,Y02T

Abstract:
1. A piston arranged for reciprocal movement in a combustion engine cylinder between a bottom dead center position and a top dead center position, the piston including a piston crown comprising an upper surface facing a combustion chamber, the piston crown containing a piston bowl formed by an outwardly opening cavity, the piston bowl comprising an outwardly flared outer bowl section having a concave curvilinear shape in cross section, at least one intake port arranged to provide the combustion chamber with intake air, an injector arranged to inject fuel into the combustion chamber from a position adjacent a geometrical centre of the combustion chamber and having impingement areas for progressing flame plumes in the outer bowl section, and protrusions arranged substantially half way between the impingement areas and in plane substantially perpendicular to the reciprocal movement protruding into the combustion chamber and having a smooth form adapted for preserving kinetic energy in a flame plume, each of the protrusions having a shape of a longitudinal ridge that extends only in the outer bowl area in a plane substantially parallel to or close to being parallel to the reciprocal movement, the ridge comprising a left side flank, a top section and a right, side flank when seen in a plane perpendicular to the reciprocal movement, the protrusions being arranged for redirecting circumferential flame progress mainly towards a center axis of the piston with minimal flame-to-flame interaction, and a transition section being arranged between each of the side flanks and the top section, the transition section comprising a deflection edge in order to minimize flow losses.