Patent ID: 8864054

Claim:
A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, the fuel injector comprising: a multi-part injection valve element which is adjustable between an opening position and a closing position, and a hydraulic coupler which couples together a first part and a second part of the injection valve element, and which is defined axially by a first guide for the first part and by a second guide for the second part, wherein the first and second guides are at least partially surrounded radially outward with fuel at high pressure, and a lesser pressure is implemented in the hydraulic coupler than radially outside the first and second guides, the hydraulic coupler is connected to a low-pressure region of the fuel injector via a radial connecting conduit in the first guide, the first guide including an annular gap disposed adjacent a lower portion of the first part that directs fuel from a first chamber into the hydraulic coupler and the second guide including an annular gap disposed adjacent an upper portion of the second part that directs fuel from a second chamber into the hydraulic coupler, and at least one axial conduit is provided axially in the first guide connecting the first chamber and the second chamber.