Patent ID: 6293254
Filing Date: 2001-09-25
Classification: F02M

Abstract:
A closed nozzle injector for injecting fuel at high pressure into the combustion chamber of an engine, comprising:an injector body containing an injector cavity and an injector orifice communicating with one end of said injector cavity to discharge fuel into the combustion chamber;a nozzle valve element positioned in one end of said injector cavity adjacent said injector orifice, said nozzle valve element movable between an open position in which fuel may flow through said injector orifice into the combustion chamber and a closed position in which fuel flow through said injector orifice is blocked;a control piston positioned on said nozzle valve element;a floating sleeve mounted on said control piston for lateral movement relative to said injector body and at least partially defining a control chamber, said sleeve including a bore for receiving said control piston, an open distal end and an open distal end sealing surface positioned in continuous sealing abutment against said injector body to prevent fuel flow from said control chamber;a drain circuit for draining fuel from said control chamber to a low pressure drain; andan injection control valve positioned along said drain circuit to control fuel flow from said control volume.