Patent ID: 8074903

Claim:
A fuel injector, comprising: an injector body defining a nozzle outlet, a cooling inlet and a drain outlet; a solenoid assembly, being disposed inside the injector body, and including a stator assembly; the stator assembly including at least one pole piece; the at least one pole piece defines a cooling passage extending therethrough; a cooling path includes the cooling passage and extends between the cooling inlet and the drain outlet; and wherein the at least one pole piece includes an inner pole piece; the cooling passage defined by the at least one pole piece being an inner pole cooling passage being defined by the inner pole piece; a needle valve member with an opening hydraulic surface exposed to fluid pressure in a nozzle chamber and a closing hydraulic surface exposed to fluid pressure in a needle control chamber; and a control valve member operably coupled to be moved by the solenoid assembly to open and close the needle control chamber to the drain outlet.