Patent ID: 6334426
Filing Date: 2002-01-01
Classification: F02B,F02F,Y02T

Abstract:
A direct fuel injection-type spark-ignition internal combustion engine comprising a spark plug, a cavity formed on the top surface of the piston, and a fuel injection valve for injecting fuel into said cavity in nearly a flat fan shape having a relatively small thickness, wherein an opposing side wall of said cavity opposite to said fuel injection valve, for leading said fuel to the vicinity of said spark plug, has an arcuate portion connecting the opposing side wall to a bottom wall and having a plurality of arcuate shapes in a plan view, the radius of the arcuate shapes at side parts of said arcuate portion in the plan view is smaller than the radius of the arcuate shapes at a center part of said arcuate portion in the plan view and said opposing side wall has a deflecting portion to deflect said fuel toward the inside of said cavity in a substantially synthesized velocity vector of the fuel.