Patent ID: 6758417
Filing Date: 2004-07-06
Classification: F02M

Abstract:
An injector for a common rail fuel injection system for internal combustion engines, comprising,an injection nozzle (7) that has a nozzle needle (31), a control chamber (3), subdivided into first, second and third portions (13, 15, 17) by a control plunger (11), the first portion (13) and second portion (15) communicating hydraulically via an inlet throttle (19) disposed in the control plunger (11), the second portion (15) hydraulically communicating with a high-pressure connection (1), and the third portion (17) hydraulically communicating with an inlet conduit (5) to the nozzle needle, the control plunger (11) having two grooves (23, 25) separated by a slide (27) embodied on the control plunger (11), the slide cooperating with a control edge (47) of a guide bore (9), when the injection nozzle (7) is closed, to effect an extensive hydraulic separation between the high-pressure connection (1) and the inlet conduit (5) to the nozzle needle, the stroke of the nozzle needle (31) and the stroke of the control plunger (11) being coupled with one another, a hydraulic connection (55) between the high-pressure connection (1), or the second portion (15), and the inlet conduit (5) to the nozzle needle, and, a multi-port directional control valve 57 operable to close the hydraulic connection (55).