Patent ID: 6565013
Filing Date: 2003-05-20
Classification: F02F,F02M

Abstract:
A common rail injector for injection of fuel into a large-scale internal combustion diesel engine, comprising an injector housing (2), which communicates via a fuel inlet (3) with a central high-pressure reservoir, which is supplied with fuel from a fuel tank via a high-pressure pump, the fuel, as a function of a position of a 3/2-way magnet valve (4) integrated with the injector housing (2) passes from the high-pressure reservoir into a high-pressure bore (5) of an injection nozzle (6) that is integrated with the injector housing (2) and includes a nozzle needle (7), the nozzle needle is axially displaceable counter to a prestressing force of a nozzle spring (8) that is received in a nozzle spring chamber (9), and the 3/2-way magnet valve (4) has a control piston (14), which can be moved back and forth between a closed and an open valve position and which on a first end is coupled with an armature (15) and a second end extends into a pressureless chamber (9), and in the open valve position the fuel inlet (3) communicates with the high-pressure bore (5) of the injection nozzle (6), and in the closed valve position, the fuel inlet (3) is closed by the control piston (14) and the high-pressure bore (5) of the injection nozzle (6) communicates with a fuel outlet (12) and with the pressureless chamber (9), and a first throttle restriction (27) is disposed between the high-pressure bore (5) and the fuel outlet (12).