Patent ID: 6964266
Filing Date: 2005-11-15
Classification: F02M

Abstract:
1. A 3/2-port directional-control valve for controlling the injection of fuel in a common rail injection system of an internal combustion engine, the valve comprising a control piston ( 44 , 21 , 22 ) guided in a housing ( 20 ), in which in a first switched position, the control piston ( 44 , 21 , 22 ) opens a hydraulic connection between an injector ( 7 ), having a nozzle needle ( 12 ), and a fuel return ( 42 , 32 ) and in which in a second switched position, the control piston ( 44 , 21 , 22 ) opens a hydraulic connection between the injector ( 7 ) and a high-pressure fuel reservoir ( 3 ), a pluger rod ( 53 ) disposed between the control piston ( 44 , 21 , 22 ) and the nozzle needle ( 12 ) of the injector, the plunger rod resting with one end against an end face of the control piston and with its other end acting on the nozzle needle, the movement of the control piston ( 44 , 21 , 22 ) is transmitted to the nozzle needle ( 12 ) of the injector ( 7 ) during the transition from the second switched position into the first switched position.