Patent ID: 8186609

Claim:
A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, having a valve piston, which is guided so that it is able to execute a stroke motion in an injector body, the stroke motion of the valve piston being controlled by a control valve having a valve needle, which valve needle is guided so that it is able to execute a stroke motion in a direction of a stroke axis, and having a guide bore into which a guide section formed onto an end of a valve component extends in order to guide the valve needle so that it is able to execute the stroke motion, wherein a riser bore extends along the stroke axis through the valve component and into the guide section and fuel is able to flow through the riser bore out of a control chamber for controlling the stroke of the valve piston and into an annular chamber provided between the guide bore and the guide section, wherein a fuel quantity conveyed through the riser bore also flows through at least one output throttle which is situated in a region of a transition from the riser bore into the annular chamber, wherein the at least one output throttle includes at least one throttle bore having a throttle cross section that is smaller than the riser bore cross section in order to form the output throttle that extends between an end of the riser bore and the annular chamber, wherein the cross section of the throttle bore widens out before emerging into the annular chamber in order to form a diffuser section with a larger diameter, and wherein the diffuser section is conically embodied, with an opening of a cone oriented toward the annular chamber.