Patent ID: 6779743
Filing Date: 2004-08-24
Classification: F02M

Abstract:
A fuel injection valve comprising: a valve member; a valve seat member which has a valve seat cooperating with said valve member, and a valve seat bore leading to a downstream end of said valve seat and opening at a front end face said valve seat member; an injector plate coupled to the front end face of said valve seat member and having a plurality of fuel injection orifices; and a flat fuel diffusion chamber provided between said valve seat member and said injector plate to widen radially outwards from an outer end edge of said valve seat bore for dispensing a fuel received therein from said valve seat bore to the plurality of fuel injection orifices in a diffusing manner;wherein an annular step is formed on a ceiling surface of said fuel diffusion chamber so that a level of the ceiling surface is gradually lowered radially outwards, and said fuel injection orifices are disposed immediately below said step and at a distance from an inner peripheral wall of said fuel diffusion chamber.