Importance

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Abstract

A unit fuel injector of the type with an open injector comprises an injector body (1) with an axial space (4), which ends in an injector cap (3), an injection plunger (15) guided in the axial space and serving as a closing-off element, which injection plunger forms in the axial space a pressure space (23) from which the injection bores (60, 61) of an upper row (60) and a lower row (61) extend. To allow the injector cross section to be adapted to all operating states, the injection plunger (15) has an axial bore (30), in which a coaxial plunger needle (31) is guided in the longitudinal direction of the injector, the needle part (32) of which needle interacts with a seat (62) formed by the interior of the injector cap (3) and arranged beneath the upper row of injection bores (60), and above the plunger part (32) of the plunger needle (31) there is provided a compression spring (35) acting on it in a downward direction, and the plunger needle forms beneath its plunger part (32) in the axial bore (30) a control chamber (50), which can be fed by a control medium which raises the plunger needle (31) against the force of the compression spring (35) with respect to the injection plunger (15).

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First Claim