Patent ID: 6601566
Filing Date: 2003-08-05
Classification: F02M,Y02T

Abstract:
A fuel injector comprising:an injector body defining a nozzle chamber, a check control chamber, a plurality of nozzle outlets; a dual concentric check assembly at least partially positioned in said injector body and including a closing hydraulic surface exposed to fluid pressure in said check control chamber; said dual concentric check assembly being movable between a first configuration in which said nozzle outlets are blocked to said nozzle chamber, a second configuration in which a first portion of said nozzle outlets are open to said nozzle chamber, and a third configuration in which a second portion of said nozzle outlets are open to said nozzle chamber; and a first spring operably positioned to bias an outer check toward a first seated position, and a second spring operably positioned to bias an inner check toward a second seated position.