Patent ID: 8251040
Filing Date: 2012-08-28
Classification: F02B,Y02T

Abstract:
1. A gasoline direct injection engine that has an injector directly injecting fuel into a combustion chamber, a spark plug, an intake valve, and an exhaust valve and generates power by reciprocating a piston in a cylinder, the gasoline direct injection engine, comprising a first cavity formed on a piston head of the piston to return at least some flow of the fuel injected from the injector to the spark plug; a protrusion protruding and off-set from the first cavity toward the exhaust valve; and a second cavity formed from the protrusion to the exhaust valve, wherein the second cavity is disposed lower than the first cavity, the second cavity surrounding the protrusion in an arc shape; wherein distal end portions of the second cavity are merged to the first cavity to form a junction portion therebetween.