Patent ID: 6572028
Filing Date: 2003-06-03
Classification: F02M

Abstract:
An fuel injector comprising:a housing; a armature assembly including an injector needle that is movable between a closed position and an open position; a needle seat for receiving said injector needle when in said closed position; an orifice disk disposed downstream of said needle seat, said orifice disk comprising one or more orifice metering pathways to direct fuel towards a desired location; a needle guide disposed upstream of said needle seat, said needle guide comprising a plurality of filtering passageways to allow fuel to pass through said needle guide and induce microswirl in the fuel, each of said plurality of filtering passageways and each of said one or more orifice metering passageways having an area, the sum of said areas of said plurality of filtering passageways being greater than the sum of said areas of said one or more orifice metering pathways, and said area of each of said plurality of filtering passageways being smaller than said area of each of said one or more orifice metering pathways to prevent particles larger than said one or more orifice metering pathways from passing through said needle guide; and a bore formed in said needle guide, through which said injector needle passes, wherein said bore keeps said injector needle seated properly on said needle seat when said injector needle is in said closed position.