Patent ID: 6626371
Filing Date: 2003-09-30
Classification: F02M

Abstract:
In a common rail injector for injecting fuel in a common rail injection system of an internal combustion engine, which system has an injector housing (1) with a fuel inlet (11) that is in communication with a central high-pressure fuel reservoir outside the injector housing (1) and with a pressure chamber inside the injector housing (1), from which fuel subjected to high pressure is injected as a function of the position of a control valve (22) that assures that a nozzle needle (5) movable back and forth and received in a longitudinal bore (4) of the injector axially counter to the prestressing force of a nozzle spring (12) that is received in a nozzle spring chamber (10), lifts a tip (6) of the nozzle needle from a seat when the pressure in the pressure chamber (8) is greater than the pressure in a control chamber (15) that communicates with the fuel inlet via an inlet throttle (19; 25, 26) and with a relief chamber via a fuel outlet (20), the improvement wherein the control chamber (15) is formed, in part, by a substantially cylindrical recess (14) in an end of the nozzle needle (5), remote from the tip (6).