Patent ID: 7992536
Filing Date: 2011-08-09
Classification: F02B,F02F,Y02T

Abstract:
1. A direct fuel injection diesel engine comprising a piston ( 13 ) for which the height of a top face changes in the circumferential direction, and a fuel injector ( 23 ) for injecting fuel from on a piston central axis (Lp) along a plurality of fuel injection axes (Li 1 , Li 2 ) spaced in the circumferential direction into a cavity ( 25 ) recessed in a central part of the piston ( 13 ), characterized in that a cross-section of the cavity ( a point at which the fuel injection cross-section Sn intersects a peripheral edge of an opening of the cavity ( a second specific point Bn is present on a line that passes through the first specific point An and is parallel to a lower face of a cylinder head ( a third specific point Cn is present on a bottom wall portion ( the second specific point Bn is positioned closer to the piston central axis (Lp) than is the first specific point An, the third specific point Cn is positioned closer to the piston central axis (Lp) than is a position where the bottom wall portion ( a cross-sectional shape surrounded by a pathway AnBn connecting the first and second specific points An and Bn via a line along the lower face of the cylinder head (