Patent ID: 8100344

Claim:
A fuel injector comprising: an injector body having a length with a first end portion and a second end portion at opposite ends thereof, said injector body also having a fuel inlet to which fuel is supplied externally from a common rail, a fuel flow path through which the fuel supplied to the fuel inlet flows, and a spray hole which is formed in the second end portion in communication with the fuel flow path and from which the fuel is sprayed; a head body formed to be separate from said injector body, said head body being joined to a joint surface of the first end portion of said injector body; a fuel pressure sensor installed in said head body, said fuel pressure sensor including a diaphragm which is formed to be separate from the injector body and which communicates with the fuel flow path in said injector body and a sensing device, the diaphragm being exposed to the fuel so as to be deformed as a function of a pressure of the fuel, the sensing device producing a signal as a function of a degree of deformation of the diaphragm; and a nozzle needle which is movable in an axial direction of said injector body to open and close the spray hole selectively, an electric actuator working to control movement of said nozzle needle in the axial direction of said injector body.