Abstract: A fuel injection valve, having an outer valve needle cooperating with a valve seat for opening and closing at least one outer injection opening, an inner valve needle disposed in the outer valve needle and cooperating with the valve seat for opening and closing at least one inner injection opening. The fuel pressure in a control chamber that can be filled with fuel under pressure acts on the outer valve needle and the inner valve needle in such a way that a closing force in the direction of the valve seat is exerted on the inner valve needle and the outer valve needle. An inner pressure face disposed on the inner valve needle and a shoulder is disposed on the outer valve needle, which each, on being subjected to pressure, exert a hydraulic opening force, oriented counter to the closing force, on the inner valve needle and the outer valve needle.

Abstract: An injector for high-pressure injection of fuel in self-igniting internal combustion engines includes an actuator valve for opening and closing the injector; a nozzle needle, which in the closed state of the injector closes at least one injection opening; a metering valve, which establishes a hydraulic communication between the actuator valve and the relief chamber of the injector; a pressure holding device, which serves to maintain a static pressure required for the metering valve; and a first control quantity line for control quantities that flow via the actuator valve, and a second control quantity line for control quantities that flow via the metering valve. The pressure holding device dynamically separates the control quantities of the metering valve from the control quantities of the actuator valve by means of a hydraulic fluctuation damper.

Abstract: The fuel injection system having one high-pressure fuel pump and one fuel injection valve for each engine cylinder in which the pump piston defines a work chamber, which communicates with a pressure chamber of the fuel injection valve. A control valve controls connection of the pump work chamber with a relief chamber and having a second control valve controls a connection of a control pressure chamber, which communicates with the pump work chamber defined by a control piston with a relief chamber is controlled, and in which connection a throttle restriction is provided.

Abstract: The fuel injection system has one high-pressure fuel pump (10) and one fuel injection valve (12), communicating with it, for each cylinder of the internal combustion engine. A pump piston (18) of the high-pressure fuel pump (10) defines a pump work chamber (22), which communicates with a pressure chamber (40) of the fuel injection valve (12); the fuel injection valve has an injection valve member (28), by which injection openings (32) are controlled and which is movable in an opening direction (29) counter to a closing force by the pressure prevailing in the pressure chamber (40). By means of a control valve (80), a connection (74) of the pump work chamber (22) with a relief chamber (24) is controlled, and having a second control valve (80), by which a connection (74) of a control pressure chamber (62), which communicates with the pump work chamber (22) and is defined by a control piston (60), with a relief chamber (24) is controlled, in which connection a throttle restriction (75) is provided.

Abstract: The invention relates to an injector for high-pressure injection of fuel in self-igniting internal combustion engines. The injector includes an actuator valve for opening and closing the injector; a nozzle needle (17), which in the closed state of the injector closes at least one injection opening (18); a metering valve (4), which establishes a hydraulic communication between the actuator valve and the relief chamber (6) of the injector; a pressure holding device (33), which serves to maintain a static pressure required for the metering valve (4); and a first control quantity line (29) for control quantities (34) that flow via the actuator valve, and a second control quantity line (43) for control quantities (35) that flow via the metering valve (4). The pressure holding device (33) dynamically separates the control quantities (35) of the metering valve (4) from the control quantities (34) of the actuator valve by means of a hydraulic fluctuation damper.

Abstract: The present invention relates to a fuel injection pump for internal combustion engines, having a pump housing, in which a feed device is accommodated, whose operation is controlled with the aid of a control unit that is accommodated in a control-unit housing mounted to the pump housing.

Abstract: A pressure sensor for detecting the pressure of a medium bounded by a wall, in particular for detecting the pressure in the pump work chamber of a fuel injection pump, with a housing that is disposed in a through bore of the central screw plug of the fuel injection pump. The housing has a separate front housing part, which is welded to a measuring element support and together with this measuring element support, a measuring element, a pressure transmission element, and a membrane that constitutes the bottom of the front housing part, constitutes a measurement head that is definitely braced in the pressure transmission direction and cannot be disassembled. The measurement head contacts the through bore and other components of the pressure sensor exclusively by way of an outer flange, which is disposed on the outer circumference of the measurement head.