Internal combustion engine fuel injector

1) A fuel injector (1) for an internal combustion engine;

• the injector terminating with a nozzle for injecting fuel into a relative cylinder of the engine, and comprising:
• a hollow injector body (2) extending in an axial direction (3);
• a control rod (10) movable axially with respect to said injector body (2) to open/close said nozzle;
• a control servovalve housed in said injector body (2) and comprising:
• a) an electro-actuator;
• b) a control chamber (23), which is bounded axially at one side by said control rod (10) and radially by a tubular portion (8), communicates with a fuel inlet (4), and has a discharge passage (26) comprising a calibrated portion (42);
• c) an axial guide (33) fixed with respect to said injector body (2), and having a lateral surface (34) through which said discharge passage (26) comes out;
• and
• d) a shutter (17) fitted in substantially fluidtight manner to said lateral surface (34), so as to slide axially, under the control of said electro-actuator, between a closed position, in which it closes said discharge passage (26) and is subjected to a substantially zero resultant axial force by the pressure of the fuel, and an open position, in which it opens said discharge passage (26) to vary the pressure in said control chamber (23) and so produce axial movement of said control rod (10);
• characterized in that said tubular portion (8) and said axial guide (33) form part of a single body (28) formed in one piece.