Common rail fuel injector for internal combustion engines, as well as a fuel system and an internal combustion engine incorporating the injector

#1. Field of the Invention

#The invention relates to a fuel injection device for internal combustion engines, in particular a common rail injector, with a housing that has an injection end, with a recess provided in the housing, with at least one axially movable valve element, which is disposed in the recess and which cooperates with a valve seat, and has a pressure surface oriented away from the injection end, which pressure surface axially delimits a control chamber, with a device that acts on the valve element counter to the force resultant of the pressure surface, and with a control valve that is connected to the control chamber via a flow throttle.

#2. Description of the Prior Art

#The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings, in which:

#FIG. 1 shows a first exemplary embodiment of a fuel injection device for internal combustion engines;

#FIG. 2 shows a depiction of a detail II from FIG. 1;

#In FIG. 1, a fuel injection device is labeled as a whole with the reference numeral 10. It is a common rail injector, which is used to directly inject highly compressed fuel into the combustion chamber of an internal combustion engine. The fuel can be diesel or gasoline. The injector 10 has a multi-part housing 12. The housing 12 includes a nozzle body 14 and an intermediary disk 16. The nozzle body 14 and the intermediary disk 16 are clamped against each other by means of a nozzle-clamping nut that is not shown in the drawing.

#The bottom end of the nozzle body 14 in FIG. 1 is embodied as the injection end 18. A recess 20 extends in the longitudinal direction inside the nozzle body 14. This recess has the form of a stepped bore and ends at the injection end 18. At the injection end 18, there are several fuel outlet openings 22 that are distributed over the circumference of the injection end 18.

#The recess 20 inside the nozzle body 14 contains a valve element 24. This valve element is a valve needle, which extends coaxial to the recess 20 and can move in the axial direction. The valve needle 24 cooperates with a valve seat (no reference numeral) in the vicinity of the injection end 18.