Patent ID: 6161518
Filing Date: 2000-12-19
Classification: F02B,F02F,Y02T

Abstract:
A direct-injection diesel engine comprising:a combustion chamber defined by a piston, a cylinder head, and a cylinder liner;a shallow-dish type piston cavity formed on a top surface of said piston;a squish area defined by said top surface of said piston and said cylinder head in the vicinity of a compression top dead center;a fuel injector for injecting fuel into said combustion chamber to combust in a fuel-air mixture state; wherein;a distance between opposite wall surfaces of said shallow-dish type piston cavity is set such that ratio Vs/Vsp is not greater than 1.25, in order to use said squish area effectively as a part of said combustion chamber by dispersing and burning a fuel uniformly within said shallow-dish type piston cavity and said squish area;where:Vs is a velocity of the reverse squish flow flowing from said shallow-dish type piston cavity to said squish area due to a movement of said piston; andVsp is a fuel spray velocity in the vicinity of a lip portion of said shallow-dish type piston cavity.