Patent ID: 7950593
Filing Date: 2011-05-31
Classification: F02M

Abstract:
1. A fuel injector comprising: an injector body that defines a nozzle outlet; a cam actuated plunger slidably positioned in the injector body and being coupled to a tappet extending outside the injector body; a direct control nozzle check valve that includes a closing hydraulic surface exposed to fluid pressure in a needle control chamber, and an opening hydraulic surface exposed to fluid pressure in a nozzle chamber; the plunger and the injector body defining a pumping chamber fluidly connected to the nozzle chamber via a nozzle supply passage; the needle control chamber being fluidly connected to the nozzle supply passage via a Z orifice passage; a needle control valve positioned in the injector body and being movable between a first position at which the needle control chamber is fluidly connected to a low pressure passage, and a second position at which the needle control chamber is fluidly connected to the nozzle supply passage via a connection passage that is in addition to, and different from, the Z orifice passage; and an electrical actuator positioned in the injector body and operably coupled to the needle control valve; and the Z orifice passage is unobstructed.