Abstract: An injector for injecting fuel into the combustion chambers of an internal combustion engine includes an injector body which is movable in a housing and whose vertical stroke motion relative to the housing is effected by a control chamber that can be pressure relieved via an actuator. Via the vertical stroke motion of the injector body, the closure or opening of a nozzle inlet line to the injection nozzle takes place. On the injector body, for stroke and/or pressure control of the injector, a first slide and a second slide are embodied, offset from one another.

Abstract: An injector for a common rail fuel injection system in which the opening of the nozzle needle is done under pressure control, while the nozzle needle is compulsorily closed when the control valve closes. This has advantages with regard to the onset of injection and the closing of the nozzle needle.

Abstract: An injector for a fuel injection system is proposed, having an at least partial compensation for the hydraulic forces acting on the nozzle needle. In addition, the fuel volume to be controlled is reduced, so that short control times are possible.

Abstract: The invention is based on a hydraulic control device (60), in particular for an injector (16) of a fuel injection system (10) in motor vehicles. Known control devices have a piezoelectric actuator, which controls a multi-position valve (75), embodied as an outward-opening valve with a valve member (74) guided in a valve bore (76). According to the invention, it is proposed that a booster (62) that reverses the deflection motion of the actuator (52) be disposed between the actuator (52) and the valve member (74), and that the multi-position valve (75) be embodied as an inward-opening 3/2-way valve. The valve member (74) of this valve, in operative connection with a valve seat (98) and a control edge (96), alternatingly opens or closes pressure fluid connections between pressure fluid conduits (86, 88, 92).

Abstract: A valve for regulating fluids includes a piezo actor (2), a converter (3) for converter the stroke of the piezo actor, an inwardly opening control valve (11), which is disposed in a valve chamber (12) and on a first valve seat (14), closes a connection to a low-pressure line (18). A nozzle needle (20) is disposed in the control chamber (21). The control chamber (21) is connected with a high-pressure line (19) via a first supply throttle (22) and with the valve chamber (12) by means of a throttle (23), whereby the valve chamber (12) is connected with the high-pressure line via a second supply throttle (24), in order to make possible a fast closing of the valve.

Abstract: The present invention relates to an injector for injecting fuel into the combustion chamber of an internal combustion engine. The injector (1) is actuated by an actuator (29) and includes a central chamber (5, 44), through which fuel under high pressure enters into a control chamber (3) that activates a nozzle needle (4). The central chamber (5, 44) is connected via a connector (7) to a high pressure source. In the injector body (13) between the central chamber (5, 44) and an end face (38) on the connector (7) are configured supply-line bores (30, 31), whose diameters (33, 34) are many times smaller than the diameters (36, 45) of the central chamber (5, 44).

Abstract: An injector for controlling fluids has a piezoelectric actuator and a hydraulic pressure intensifier. The hydraulic pressure intensifier is composed of a first piston, a second piston and a pressure chamber filled with fluid and situated between the two pistons. In addition, a control valve and a priming device are provided to replace the fluid loss in the pressure chamber caused by leakage. The priming device has a priming chamber filled with fluid, and leakage losses in the pressure chamber are replaced by fluid from the priming chamber during a return movement of the hydraulic pressure intensifier as a result of a displacement effect in the priming chamber created directly or indirectly by the first piston.

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: A piezoelectric actuator for actuating a mechanical component includes a piezoelectric element, for subjecting an actuating element to a tensile force or compressive force, and a compensating element, with the piezoelectric element and the compensating element having essentially the same coefficients of temperature expansion. The compensating element is mechanically coupled to the piezoelectric element in such a way that the temperature-caused expansions of the piezoelectric element and of the compensating element cancel one another out in the effective direction in such a way that the actuating element remains in its position.

Abstract: A two-stage magnet valve for injectors of injection systems for internal combustion engines is proposed, which is very compact and simple in design, because an in-line connection of the first valve spring and a second valve spring can be avoided.

Abstract: A piezoelectric actuator in which a piezoelectric element is present for subjecting an actuating element to a tensile or compressive stress. A sleeve is secured to a foot part, to which the piezoelectric element is secured and by way of which the piezoelectric element is kept centered in a housing under mechanical prestressing, and this sleeve surrounds the piezoelectric element 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 and the piezoelectric element, a heat-conducting elastomer is placed, and the sleeve comprises a heat-conducting material that is deformable within predetermined limits.

Abstract: A valve for controlling fluids is proposed that for its actuation cooperates with a piezoelectric actuator (2). To compensate for changes in the length of the piezoelectric actuator (2) in the stroke direction that are caused by temperature changes, a compensation element (7) is provided, which comprises a material that has a coefficient of thermal expansion that is approximately equivalent to that of the piezoelectric actuator (2). The piezoelectric actuator (2) and compensation element (7), upon a certain temperature change, exhibit a comparable change in their length in the stroke direction. As a result, the change in length of the piezoelectric actuator with the temperature is compensated for. The valve is intended for use in fuel injection devices for internal combustion engines.

Abstract: A piezoelectric actuator having a plurality of plates of a piezoelectric material whose polarization direction runs perpendicularly to the plate plane, and which are stacked one over another in their polarization direction. The piezoelectric actuator includes a control voltage source having two contacts, two groups of at least two outer electrodes, respectively, and a plurality of internal electrodes which, in each case, are arranged between the piezoelectric plates. In this context, the outer electrodes of the first group are electrically connected to a first contact of control voltage source, and the outer electrodes of the second group to the second contact of control voltage source. Internal electrodes alternately contact outer electrodes in such a way that, in each case, an internal electrode is electrically connected to one contact of control voltage source, and the internal electrode that is next in the stacking direction is electrically connected to the other contact of control voltage source.

Abstract: A fuel injection device of an internal combustion engine includes a housing with an injection region. The housing contains a recess in which two valve elements are disposed. The inner valve element is shorter than the outer valve element. A loading device at least sometimes acts on the inner valve element in the opening direction. A control piston cooperates with the inner valve element. It has a pressure surface, which delimits a control chamber and whose force resultant points in the closing direction. The loading device exerts an approximately constant opening force on the inner valve element. The fluid pressure in the control chamber can be temporarily reduced.

Abstract: An injector for injecting fuel, which is at high pressure, into the combustion chamber of an internal combustion engine includes valve body movably received in an injector housing, and a slide region is embodied on it. The valve body further includes a seat diameter, which cooperates with a seat face embodied on the housing and by way of which a nozzle inlet to a nozzle chamber of an injection nozzle can be opened and closed. The valve body is embodied as a 3/3-way control valve, by way of whose slide region a control chamber that varies the stroke of a nozzle needle can be controlled.

Abstract: A valve for controlling fluids, having an inflow line and a leak fuel line, which each communicate with a pressure chamber. A piston element is adjustable by a control element and opens and closes a first passage between the inflow line and the pressure chamber. The piston element has a slide element, which is disposed directly at the seat of the piston element. The stroke length of the slide element for opening the first passage is greater than or equal to the stroke length for closing a second passage between the pressure chamber and the leak fuel line.

Abstract: The present invention relates to a valve for controlling fluids, having a piezoelectric actuator (2), a booster for boosting the stroke of the piezoelectric actuator (2), and a control valve (14) that is actuatable by the booster. A device (27) for temperature compensation of a change in length of the piezoelectric actuator (2) dictated by a change in temperature is also provided. The booster is embodied as a diaphragm (3) and is disposed in a prestressed state. The diaphragm (3) boosts the stroke of the piezoelectric actuator with a boosting ratio a/b. At the same time, sealing off of the piezoelectric actuator (2) from the fluid to be controlled is furnished by the diaphragm (3).

Abstract: A control valve for injectors of injection systems for internal combustion engines is proposed, in which the final control element is actuated by an actuator via a hydraulic booster.

Abstract: The invention relates to a common rail injector for injecting fuel in a common rail injection system of an internal combustion engine, which system has an injector housing (1) with a fuel inlet (24) that is in communication with a central high-pressure fuel reservoir outside the injector housing (1) and with a pressure chamber (27) inside the injector housing (1), from which fuel subjected to high pressure is injected as a function of the position of a control valve (18) that assures that a nozzle needle (8), which is movable back and forth and received in a longitudinal bore (6) of the injector axially counter to the prestressing force of a nozzle spring (21) that is received in a nozzle spring chamber (20), lifts from a seat when the pressure in the pressure chamber (27) is greater than the pressure in a control chamber (30) that communicates with the fuel inlet (24) via an inlet throttle (19).

Abstract: The invention concerns an injector for the injection of fuel into the combustion chambers of combustion engines. Inside an injector housing (9) is located a nozzle needle (14), which is surrounded by a nozzle chamber (18). The nozzle needle (14) is moveable back and forth within the injector housing, and is aligned by the guiding sections (16, 22) inside the injector housing (9). A thick spring (11) pressed the nozzle needle against the injector (14) a ring canal (23) is formed between injector housing (9) and nozzle needle (14) and a conical section (33) of said nozzle needle (14) follows in the direction towards the seat (30).