Patent ID: 7275520
Filing Date: 2007-10-02
Classification: F02M

Abstract:
1. In a fuel injection device, having an injection valve, having a line that supplies highly pressurized fuel to the injection valve during operation, and having a control valve that controls the pressure in a control chamber of the injection valve, which chamber is connected to the above-mentioned line, and whose moving valve element is actuatable by an actuator via a hydraulic coupler that has two pistons that cooperate with a coupler volume of the coupler, the seat of the moving valve element having an inner cross-sectional surface area f 3 and with means for filling the coupler volume with pressurized fuel via guidance gaps of the pistons, the improvement wherein the pistons are situated one inside the other in parallel fashion; a booster chamber situated at the ends of the pistons oriented away from the actuator; a filling chamber inside the outer piston, the filling chamber being connected to said line by means of an annular groove via in a housing guiding said outer piston and a conduit in the outer piston; one of the pistons having a piston surface area f