Abstract: Disclosed in an injector for injecting fuel into the combustion chambers of an internal combustion engine, in which control part body is received movably in an injector housing and its opening and closing motion is effected via pressure relief of a control chamber. The pressure relief of the control chamber is controlled via an externally actuatable actuator. On the control part body, a sealing seat diameter that seals off the valve chamber is provided, which closes and opens the inlet from a common rail. An annular throttle element of variable cross section is located downstream of the sealing seat diameter of the control part body. An annular throttle element of variable cross section, or a throttle slide with a throttle, is located downstream of the sealing seat diameter of the control part body.

Abstract: A piezoelectric actuator in which at least on piezoelectric element is present for subjected an actuating element to a tensile force or compressive force. In addition, stabilizing elements are mounted parallel to the piezoelectric element with a flexible intermediate layer located between the elements. The piezoelectric element and the stabilizing elements have a great length in the effective direction (Z axis) in proportion to their width transversely to the effective direction (X, Y direction).

Abstract: The invention relates to a high-pressure fuel reservoir for a common rail fuel injection system of an internal combustion engine, having a plurality of connection openings, in particular connection openings for delivering and removing fuel and connection openings for sensors and valves and so forth. To increase the strength of the high-pressure fuel reservoir, the high-pressure fuel reservoir is equipped with a pulsation damping device.

Abstract: The invention relates to an injector with a valve chamber which is contained in an injector housing and can be loaded by way of an inlet from the high-pressure accumulation chamber. This valve chamber loads a nozzle inlet to an injection nozzle by means of a control element that can be moved in the injector housing upon the pressure relief of a control chamber. On the control element, which is embodied of one part or multiple parts, a control surface is disposed in the pressure relief region of the nozzle inlet.

Abstract: The invention relates to a common rail for a common rail fuel injection system of an internal combustion engine, and to a method of making such a common rail, having a hollow base body that is equipped with a plurality of connection openings. To enhance the high-pressure strength, the interior of the base body is embodied as substantially flat in the region of the connection openings.

Abstract: The present invention relates to a valve for controlling fluids, which has an actuator (2) and a mechanical booster (3) for boosting a stroke of the actuator (2). A restoring spring (4) and a valve element (6) are also provided. The booster (3) is embodied as a kidney-shaped tilt lever (13, 14, 23), which has point-type bearing points.

Abstract: In a fuel injection nozzle for an internal combustion engine, having a nozzle body (10), a nozzle needle (12) which is displaceable in the nozzle body between a closed position, in which it rests on a sealing seat (16), and an opened position in which it is lifted from the sealing seat in the direction toward the combustion chamber, having a pressure chamber (24), which communicates with a fuel inlet (26), having a control chamber (42), which under the control of a control valve (46) communicates with the fuel inlet, and having a thrust rod (40), which communicates with the nozzle needle and protrudes into the control chamber, the object is to reliably furnish a closing force that overcomes an opening force generated in the region of the sealing seat.

Abstract: A fuel injection valve for internal combustion engines, having a valve body (3) in which a bore (7) is embodied. A valve seat face (10) and at least one injection opening (9) are embodied on the end toward the combustion chamber of the bore (7), and at least one injection opening (9) connects the bore (7) with the combustion chamber of the engine. A nozzle needle (12) is longitudinally displaceably guided in the bore (7) and on its end toward the combustion chamber it has a sealing face (217), which cooperates with the valve seat face (10) and thus controls the at least one injection opening (9). The nozzle needle (12) has a central longitudinal bore (19), in which an inner needle (14) is disposed that is fixed immovably relative to the valve body (3). The nozzle needle (12) is guided over at least part of its length on the inner needle (14), so that the nozzle needle (12) is kept exactly centrally in the bore (7) at all times (FIG. 1).

Abstract: A valve for controlling fluids, with a valve element 4, which can be actuated by a transmission 3, in which the transmission 3 is controlled by the stroke of a piezoelectric actuator. The valve 1 according to the invention is characterized by means of the fact that the valve element 4 has a double-seat valve, in which two separate valve bodies 5, 7 are guided.

Abstract: A method and a device for storing and/or reading out data of a fuel metering system, in particular a fuel pump or an injector, are described. Data on the fuel pump and/or the injector is assigned to at least one electronic component. The data is taken into account by a control unit in controlling the fuel metering system. The component is mechanically and/or electrically connected to the control unit during a first interval of time and is mechanically and/or electrically detached from the control unit and/or the fuel metering unit during a second interval of time.

Abstract: The invention relates to an injection system, having a control valve (2), an actuating element for actuating the control valve (2), an injection nozzle which is controllable by the control valve (2) via a pressure buildup or pressure reduction in a control chamber (8), wherein the control valve (2) has at least two switching states, and in a first switching state of the control valve (2), a first pressure is established in the control chamber (8), at which pressure the injection nozzle is closed, and in a second switching state of the control valve (2), a second pressure is established in the control chamber (8), at which the injection nozzle is opened, wherein the control valve (2) has at least one third switching state, in which a third pressure is established in the control chamber (8), which pressure is between the first pressure and the second pressure and at which the injection nozzle is opened.

Abstract: The invention relates to an injector for reservoir (common rail) injection systems for direct-injection internal combustion engines in which a nozzle needle which is surrounded by a nozzle chamber is guided in an injector housing. The inlet of the nozzle chamber is closable and openable via an externally actuatable closing element. From the nozzle inlet, inlets branch off to control parts. The inlets are embodied as throttle elements, one of which is closable on the outlet side via a closing element.

Abstract: A piezoelectric element with a multi-layer construction of piezoelectric layers (2) that have electrodes (6, 7) disposed between them is proposed, which is provided with a contacting of the electrodes (6, 7) on alternating sides by means of external electrodes (8, 9). The individual piezoelectric layers (2) are comprised of a continuous foil made of ceramic, which can be folded during manufacture, and are completely or partially provided with the electrically conductive electrodes (6, 7); the external electrodes (8, 9) are attached to the metallized layer on the respective outsides in the bending region of the folded foil in order to produce the contact on alternating sides.

Abstract: A fuel injection valve contains a piston-shaped valve needle for closing at least one injection opening at the combustion chamber end of the bore. A conical valve seat at the combustion chamber end of the bore is contacted in the closed position of the valve needle by a valve sealing surface on the of valve needle in order to seal the at least one injection opening. The valve sealing surface includes a first conical surface and a second conical surface and the valve seat contains a first annular groove, which extends in a radial plane of the valve bore, and a second annular groove, which is disposed downstream of and parallel to this first annular groove.

Abstract: The invention proposes an injection apparatus (1) for fuel, with a system pressure region (14) in which a system pressure prevails and an injection pressure region (11) in which an injection pressure prevails, wherein the injection pressure is greater than the system pressure. The injection pressure region (11) and the system pressure region (14) communicate with each other by means of a throttle device (12, 13). The system pressure in the system pressure region (14) can be controlled by means of a system pressure valve (16). The invention also proposes a method for producing a system pressure in an injection apparatus for fuel.

Abstract: A pressure-controlled injector for injection systems for injecting fuel that is at high pressure into combustion chambers of internal combustion engines. A 3/2-way valve body is provided, which communicates with an inlet for fuel from a high-pressure collection chamber (common rail). The nozzle chamber of a nozzle needle can also be acted upon by fuel at high pressure. The stroke motion of the nozzle needle can be achieved via a hydraulic control chamber that can be pressure-relieved via a control line that has an externally actuatable control element.

Abstract: A fuel injector, in particular an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator. The actuator operates a valve closing body by means of a valve needle, working together with a valve seat face to from a sealing seat. A fuel line leads from a fuel inlet connection to the sealing seat. A fuel line leads from a fuel inlet connection to the sealing seat. The actuator is tubular and surrounds at least some sections of the fuel line.

Abstract: The fuel injection valve (16) has an injection valve member (24), by which at least one injection opening (26) is controlled. The motion of the injection valve member (24) is influenced by a control valve (18), which has a control valve member (62) by which the pressure in a control pressure chamber (48) is controlled and which is movable by an adjusting force generated by a piezoelectric actuator (80) and in the process control the communication of the control pressure chamber (48) with a relief chamber (12). The control valve (18) has two valve seats (60, 74), spaced apart from one another in the direction of motion of the control valve member (62), with which seats the control valve member (62) cooperates, each with a respective sealing face (66, 69) disposed on it, so that the control valve member (62) has two closing positions, in which the control pressure chamber (48) is disconnected from the relief chamber (12).

Abstract: A high pressure collecting chamber for receiving a fuel supply under pressure, has a piston-shaped pressure multiplication element; a line to a nozzle holder combination such that via the pressure multiplication element fuel with high pressure is available in the line; a pre-stressing element for the pressure multiplication element; a control chamber through which the pressure multiplication element is integrated, wherein the pre-stressed pressure multiplication element which is actuated via the control chamber is integrated in the high pressure collecting chamber.

Abstract: For each cylinder of the internal combustion engine, the fuel injection system has one high-pressure fuel pump and one fuel injection valve communicating with it. A first pump piston of the high-pressure fuel pump defines a pump work chamber, which communicates with a pressure chamber of the fuel injection valve; the fuel injection valve has an injection valve member, by which injection openings are controlled, and which is movable by the pressure prevailing in the pressure chamber in an opening direction counter to a closing force. The high-pressure fuel pump has a second pump piston, which defines a work chamber, and on which, after an initial pumping stroke, the first pump piston comes to rest, so that the second pump piston likewise executes a pumping stroke.