Abstract: A fuel injector for injecting pressure fuel in a combustion chamber of an internal combustion engine has an injector housing, an inlet connectable with a high pressure collecting chamber, a nozzle inlet line, a 2/2-way valve for opening and closing the nozzle inlet line, a control chamber in which a pressure change occurs, at least one first ball valve positioned at a side of the control chamber, at least one second ball valve positioned at a side of the inlet, and a guide element movable in the housing, the first and second ball valve being positioned opposite to one another and associated with the movable guide element.

Abstract: An injector for injecting fuel in a combustion chamber of an internal combustion engine has an injector housing, 2/2-way double valves received in the injector housing and coupled with one another for joint vertical movements, a hydraulic multiplier associated with the 2/2-way-control valves, a nozzle chamber which surrounds a nozzle needle and supplied with high pressure fuel by the hydraulic multiplier, the 2/2-way control valves in the housing being turned relative to one another and have valve bodies and guiding elements which surround the valve bodies.

Abstract: A fuel injection valve for internal combustion engines, having a valve body a bore in which a valve member is disposed to be axially movable counter to a closing force. On its end, the valve member has a substantially conical valve member tip, which with a part of its jacket face that serves as a valve sealing face comes to rest on a valve seat, embodied on the end toward the combustion chamber of the bore. At the transition from the valve member to the valve member tip, an annular groove undercuts the valve sealing face in part and thereby forms an annular collar, which is resiliently yielding. The cone angle of the valve sealing face, in the open position of the valve member, is somewhat larger than the cone angle of the valve seat, so that in the closing motion of the valve member toward the valve seat, the annular collar is first seated with the outer sealing edge and is deformed inward by the further closing motion.

Abstract: The invention relates to an injector for injecting fuel into combustion chambers of an internal combustion engine. The injector includes an injector housing, in which a control chamber is embodied that can be subjected to a control volume via an inlet throttle. The control chamber can be pressure-relieved to an actuator-actuatable control element as a result of which a control part is movable vertically in the injector housing. The control part and the nozzle needle are embodied integrally.

Abstract: A fuel injection apparatus for internal combustion engines conveys fuel from a high-pressure fuel reservoir to an injection opening by means of a control valve, which can be actuated by a piezoelectric unit. The control valve has a valve member, which can be moved axially between a first valve seat and a second valve seat, which define a first valve chamber. A line leading from the high-pressure fuel source feeds into a second valve chamber, which is defined by the first valve seat and a first guide of the valve member in the valve body. A line, which leads to the injection opening, branches from the first valve chamber. A second guide of the valve member is provided in a region of the valve member adjacent to the second valve seat. On the respective side of each guide, a respective leakage line is provided. The diameters of the valve seats and the guides are respectively selected to be the same so that a force compensation is achieved in the control valve.

Abstract: The invention relates to a common rail for a common rail fuel injection system of an internal combustion engine, having a tubular base body whose interior communicates with a plurality of connections. To increase the high-pressure strength, the interior is formed by at least two substantially circular-cylindrical recesses or bores which communicate with one another and whose longitudinal axes are parallel to one another. The connections originate only at the jacket face of one of the substantially circular-cylindrical recesses.

Abstract: An injector for injecting fuel into the combustion chambers of an internal combustion engine in which a movable control part is contained in the housing of the injector and is guided in this injector housing to unblock the inlet to an injection nozzle when a closing element relieves the pressure in a control chamber or closes the inlet when a pressure is built up in the control chamber. The nozzle needle of the injector is associated with a piston element which encourages the closing movement of the nozzle needle and counteracts its opening movement.

Abstract: A hydraulic control device for an apparatus for injecting fuel into a combustion chamber of an internal combustion engine has an externally controllable actuation device and a valve part, which cooperates with this actuation device. In order to determine the injection parameters, this valve part controls pressure fluid connections between at least one high pressure-carrying conduit and a low pressure-carrying conduit. The valve part has at least two valve seats in order to produce a multi-stage injection event. These are controlled by separate valve members, which are guided so that they can move in relation to each other and can be actuated in the same direction. Multi-stage injection events can consequently be produced by means of a single triggering of the actuation device. This reduces the triggering frequency and therefore reduces the heat generation of the actuation device.

Abstract: In a component, in particular a high-pressure part for a fuel injection system, having intersecting bores, at least one bore of the two intersecting bores is designed with a flat region, and the component has inherent compressive stresses in the area of the flat region of the bore. This yields an increase in strength of the component in the area of the intersection point of the two bores.

Abstract: A piezoelectric actuator, e.g., for actuating a mechanical component, is proposed, in which a piezoelectric element (2) for acting on an actuating element (9) with a pulling or pushing force, and a compensating element (3; 20) are provided, wherein the piezoelectric element (2) and the compensating element (3; 20) basically have the same temperature expansion coefficients. The compensating element (3; 20) is mechanically coupled to the piezoelectric element (2) in such a fashion that the temperature-induced expansions of the piezoelectric element (2) and the compensating element (3; 20) cancel each other out in the effective direction in such a fashion that the actuating element (9) remains in its position. A heat transfer compound (12) is located between the piezoelectric element (2; 21) and the compensating element (3; 22).

Abstract: The invention relates to an injector for injecting fuel, which is at high pressure, into the combustion chambers of an internal combustion engine. In the injector housing of the injector, a control part and a nozzle needle are received movably, and the injection nozzle inlet is opened by opening a valve chamber and by pressure relief of a control chamber. In the injector housing, control chambers for actuating a nozzle needle and the control part are provided, which can be pressure-relieved via a common control valve.

Abstract: The present invention relates to a valve for controlling fluids, which has a piezoelectric actuator (2), a mechanical booster (3) for boosting the stroke of the piezoelectric actuator (2), a restoring element (4), and an actuating piston (6). The mechanical booster (3) is disposed in the actuating direction of the piezoelectric actuator between the piezoelectric actuator (2) and the restoring element (4). Thus the mechanical booster (3) boosts the stroke of the piezoelectric actuator (2) in the actuating direction, and in the opposite direction boosts the restoring force of the restoring element (4).

Abstract: The invention relates to a common rail fuel injector having an injector housing with a fuel inlet in communication with a central high-pressure fuel reservoir outside the injector housing and with a pressure chamber inside the injector housing. A control valve that assures that a nozzle needle lifts from a seat when the pressure in the pressure chamber is greater than the pressure in a control chamber that communicates with the fuel inlet via an inlet throttle and with a relief chamber via a fuel outlet. The control chamber is integrated with the end, remote from the combustion chamber, of the nozzle needle.

Abstract: The invention relates to an injector for injecting fuel into combustion chambers of an internal combustion engine. A control part is provided in the housing of the injector and protrudes into a control chamber, in which a control volume is enclosed. The control chamber can be pressure-relieved via an actuator. In the housing of the injector body, the control part is acted upon by spring elements. The control part is guided in a guide sleeve that defines the control chamber.

Abstract: An injector for injecting fuel into a combustion chamber of an internal combustion engine has a nozzle needle having a nozzle chamber with a nozzle inlet, a pressure convertor with a pressure chamber, two control valves arranged after the pressure convertor and having one control valves which releases and closes the nozzle inlet to the nozzle chamber of the nozzle needle, control chambers, and a high pressure line through which the control chambers and the pressure chamber of the pressure convertor are loaded with high pressure, one of the control chambers of the pressure convertor being connected by one of the control valves, while the nozzle inlet is provided with high pressure.

Abstract: The invention concerns an injection device having a fluid port (10), a control valve (12), a setting element (14), by way of which a region of a first face (24) of the control valve (12) can be acted upon with force, and a control chamber (30) provided on the side of a second face (26) of the control valve (12), whereby a compensating chamber (28) is provided on the side of the first face (24) of the control valve (12), the compensating chamber (28) is partially limited by the first face (24) of the control valve (12), and the compensating chamber (28) communicates with the control chamber (30). The invention also concerns a control valve as well as a method for injecting fluid.

Abstract: An injector of a pressure-controlled fuel injection system includes a locally disposed hydraulic pressure booster, a device for centrally generating a control pressure for actuating the pressure booster, and a metering valve for regulating the fuel inflow to the pressure chamber of the pressure booster.

Abstract: A piezoelectric actuator (1) is proposed, in which a piezoelectric element (2) is present for subjecting an actuating element to a tensile or compressive stress. A sleeve (4; 20) is secured to a foot part (3), to which the piezoelectric element (2) is secured and by way of which the piezoelectric element (2) is kept centered in a housing (8) under mechanical prestressing, and this sleeve surrounds the piezoelectric element (2) in such a way as to stabilize it mechanically, at least in partial regions that are electrically insulated from the piezoelectric element. Between the sleeve (4; 20) and the piezoelectric element (2), a heat-conducting elastomer (6) is placed, and the sleeve (4; 20) comprises a heat-conducting material that is deformable within predetermined limits.

Abstract: An injection nozzle has a nozzle body (12), a nozzle needle (18) that is supported displaceably in the nozzle body, a control chamber (20) that communicates with a fluid inlet (30) and a fluid outlet (34), and a valve element (40) that can open and close the fluid outlet (34). The control chamber is laterally defined by a displaceable ring (24); the ring rests on the nozzle needle, and a closing spring (28) presses the ring against the nozzle needle in fluid-tight fashion.

Abstract: The invention relates to an injector for injecting fuel into the combustion chambers of an internal combustion engine. The inlet originating at a high-pressure collection chamber (common rail) discharges into the housing of the injector, in which a control part is received, movable vertically. The motion of the control part is effected via the pressure relief of a control chamber, provided in the housing of the injector, by means of an actuator-actuatable closing element. Upon triggering of the control part via the actuator-actuatable closing element, a seat valve embodied as a spherical control body closes or opens inlets and outlets.