Patent ID: 7124744
Filing Date: 2006-10-24
Classification: F02M

Abstract:
1. A fuel injector comprising: an injector body defining a nozzle outlet and a needle control passage; a needle valve member positioned in said injector body and including a closing hydraulic surface exposed to fluid pressure in said needle control passage, and being movable between an open position in which said nozzle outlet is open, and a closed position in which said nozzle outlet is blocked; an orifice member positioned in said injector body and defining a flow passage with a minimum flow area along its lenght, which is a restricted flow area, and being movable between a first position and a second position; said needle valve member displacing fluid through said flow passage when moving toward said open position; and said needle control passage having a minimum flow area along its lenght, which is an unrestricted flow area, and fluid being displaced through said unrestricted flow area toward said closing hydraulic surface over at least a portion of movement of said needle valve member between said open position and said closed position.