Patent ID: 8069840

Claim:
An injector for injecting fuel into combustion chambers of internal combustion engines, in particular a common rail injector, comprising: a high-pressure region; and a valve element ( 14 ) that is axially movable between a closed position and an open position that enables fuel flow, the valve element including a first subcomponent and at least one separate second subcomponent, which are hydraulically coupled to each other via a coupler chamber, wherein the coupler chamber is formed by a sleeve which surrounds at least a part of the first subcomponent or the second subcomponent, wherein there is a small gap between the sleeve and the subcomponent which it surrounds, and wherein the coupler chamber is hydraulically connected to the high-pressure region of the injector by the small gap, and the small gap connects to the high pressure region in only one axial direction, and wherein the first subcomponent is embodied as a control rod, which is operationally connected to a control chamber, and the second subcomponent is embodied as a nozzle needle, which cooperates in a sealing fashion with a needle seat.