Abstract: A fuel injector, in particular for fuel injection systems of internal combustion engines, has a valve closing body which can be operated by an actuator by a valve needle and which cooperates with a valve seat face to form a sealing seat. Swiveling toggle elements are situated between the actuator and the valve needle, so that the actuator acts on first lever arms of the swiveling toggle elements, and second lever arms are mechanically linked to the valve needle.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine encompasses a piezoelectric or magnetostrictive actuator (3), a valve needle (10) actuable by the actuator (3), the valve needle (10) cooperating with a valve-closure member (17) to form a sealing seat (25) together with a valve-seat member (18), and a restoring spring (20) by which the valve needle (10) is acted on in a closing direction. The valve needle (10) is pressure-equalized in that the force exerted by the fuel pressure on the valve needle (10) in the opening direction is approximately equal to the force exerted by the fuel pressure on the valve needle (10) in the closing direction.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine includes a piezoelectric or magnetostrictive actuator (6) and an hydraulic coupler (2), the coupler (2) having a master piston (3) and a slave piston (8), which are connected to a pressure chamber (14), and the pressure chamber (14) being filled with an hydraulic fluid. The pressure chamber (14) is sealed from an actuator chamber (21) by a first seal (12) and from a valve interior chamber (17) by a second seal (13).

Abstract: A fuel injector, especially a fuel injector for injection systems of internal combustion engines, includes a solenoid which works together with an armature and a valve needle to actuate a valve-closure member, which together with a valve-seat surface forms a sealing seat. A longitudinal axis of the valve needle is inclined by a prescribed angle with respect to a longitudinal axis of a valve housing. The armature is linked with an actuating body whose longitudinal axis is inclined with respect to the longitudinal axis of the valve needle and which acts on the valve needle through a hydraulic device.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine includes a valve needle (4) situated in a nozzle body (3), the valve needle (4) being actuable by an actuator (7) and acted upon by a restoring spring (9) in such a manner that a valve-closure member (5) which is in operative connection to the valve needle (4) and faces the combustion chamber is kept in sealing contact to a valve-seat surface (6) in the non-actuated state of the actuator (7). A first jet-opening angle &agr;1 is assigned to a first lift state of the valve needle (4) and a second jet-opening angle &agr;2 to a second lift state of the valve needle (4).

Abstract: A fuel injector, especially for the direct injection of fuel into the combustion chamber of a mixture-compressing internal combustion engine having externally supplied ignition, comprising a swirl disk having swirl channels and a central recess, and having a guide compensator inserted into the recess whose center axis is able to be inclined relative to the center axis of the fuel injector and which has a sealing fit with respect to the valve needle. Formed by a sealing-seat surface, disposed in the swirl disk, and a radial widening of the guide compensator is a sealing seat which tolerates an excursion of the center axis, preventing a swirl-free leakage flow in the same manner as the sealing fit between the valve needle and the guide compensator.

Abstract: A fuel injection valve, especially an injection valve for fuel injection systems of internal combustion engines, includes a piezoelectric or magnetostrictive actuator and a valve-closure member, which can be actuated by an actuator via a valve needle and interacts with a valve-seat surface to form a sealing seat. An intermediate piece is connected via a first flexible seal to a support plate; the support plate is connected via a second flexible seal to a driver at the valve needle; and the driver is connected via a third flexible seal to the intermediate piece, thereby creating a sealed hydraulic translation device.

Abstract: A method of manufacturing a plurality of piezoelectric actuators (1) includes the following operations: manufacturing of sheets (10) from a piezoelectric ceramic material, coating at least one surface of the sheets (10) with electrodes (3), stacking and pressing the sheets (10) to form a stack, sintering the stacked sheets (10), and separating the stack to form individual actuators (1). At least one cutout (11) for each actuator (1) is made in the sheets (10) prior to stacking and sintering, the cutouts (11) of the sheets (10) being arranged exactly flush one above the other in stacking.

Abstract: A fuel injector for fuel injection systems of internal combustion engines has a valve-closure member (4) that is in working engagement with a valve needle (3) and that coacts with a valve-seat surface (6), positioned in an orifice of a valve-seat member (5), to form a sealing seat; and has at least one spray discharge opening (7) positioned in the valve-seat member (5). Between the valve-seat surface (6) and the spray discharge opening (7), a second surface (36) that encloses with the center axis (37) of the fuel injector (1) a more acute angle (&bgr;) than the valve-seat surface (6) is formed by the orifice of the valve-seat member (5). A closure element extension (35), whose enveloping surface (39) forms an obtuse angle with the contiguous contour of the valve-closure member (4), is positioned at the downstream end of the valve-closure member (4).

Abstract: An actuator (1), in particular for operation of fuel injectors in fuel injection systems of internal combustion engines, has in this embodiment a plurality of layers (2) of a piezoelectric or magnetostrictive material arranged in a stack. The actuator (1) is prestressed by a tie rod (6) arranged in a central recess (5) by way of opposing threads (7 and 8). Securing the device and the transfer of force are accomplished by a cover plate (3) and a bottom plate (4). The prestress can also be created by a sheathing (9) surrounding the actuator (1), which transfers an axial force component onto the layers (2) via the cover plate (3) and the bottom plate (4) by flanging of projecting ends (10).

Abstract: A fuel injector, in particular an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator, a valve closing body which can be operated by the actuator by way of a valve needle and which cooperates with a valve seat face to form a sealing seat, and having a hydraulic lifting device including two lifting cylinders that can move in opposite directions. The lifting device is a subassembly hermetically sealed off from a valve interior and has a housing having at least one section which is flexible in the axial direction.

Abstract: A fuel injector, in particular a fuel injector for fuel systems of internal combustion engines, has a piezoelectric or magnetostrictive actuator, a valve needle operated by the actuator by way of a hydraulic temperature compensation device, and a valve closing body operated by the valve needle and cooperating with a valve seat face to form a scaling seat. The temperature compensation device includes a needle driving sleeve which surrounds a valve needle shoulder of the valve needle and, together with a needle driving shoulder, surrounds the valve needle in sections. In addition, the needle driving sleeve together with the valve needle encloses a temperature compensation space, and the temperature compensation space is connected to a fuel inlet of the fuel injector through a directional valve for filling the temperature compensation space with fuel.

Abstract: A method of metering fuel with a fuel injector, in particular a fuel injector for fuel injection systems in internal combustion engines is described, having a piezoelectric or magnetostrictive actuator and a valve closing body which is operable by the actuator with a valve lift, cooperating with a valve seat face provided on a valve seat body to form a sealing seat. The valve lift may be adjusted variably as a function of a variable control signal triggering an actuator to produce a variable fuel flow at the sealing seat. To produce afitted curve, the fuel flow of the fuel jet sprayed by the fuel injector is measured as a function of the control signal to produce a fitted curve, and a predetermined fuel flow is set with the control signal by using the fitted curve.

Abstract: A fuel injector, particularly an injector of an internal combustion engine, has a piezoelectric or magnetostrictive actuator which is arranged in an actuator chamber which is sealed against the fuel, the fuel injector having a valve-closure member which can be actuated by the actuator via a valve needle, and which cooperates with a valve-seat face to form a sealing seat. In this context, the seal for forming the permeation-resistant sealing contains at least two elastomer sealing devices arranged in tandem.

Abstract: A fuel injector, especially an injector valve for fuel injection equipment in internal combustion engines, includes a piezoelectric or magnetostrictive actuator and a valve closing body, operable by an actuator with the aid of a valve needle, which cooperates with a valve seat surface to form a sealing seat, and a valve housing. The actuator is prestressed by a compression spring and, together with this, is surrounded by an actuator housing which is supported by fluid at both its ends.

Abstract: A fuel injector for fuel injection systems of internal combustion engines, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, includes a solenoid coil, an armature that is acted upon in a closing direction by a resetting spring, and a valve needle that is in a form-locking connection with the armature for actuating a valve-closure member, which together with a valve seat surface forms a sealing seat. A cooperates with the resetting spring such that the spring forces of the resetting spring and of the are added together. In this context, the resetting spring is biased over a total lift of the armature and the is biased only over a residual lift of the armature, which is smaller than the total lift.

Abstract: A fuel injector (1), in particular for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, includes a valve housing formed by a nozzle body (2), as well as a sealing ring (34), which seals the fuel injector (1) against a cylinder head (42) of the engine.

Abstract: A fuel injector (1), in particular for the direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine includes an actuator (10), a valve needle (3) actuatable by the actuator (10) for operating a valve-closure member (4), which, together with a valve-seat surface (6) forms a sealing seat and a swirl disk (35) having at least one swirl channel (36). An elastic fuel metering ring (37) is situated in a recess (43) of a nozzle body (2) of the fuel injector (1) in such a manner that a metering cross-section of the at least one swirl channel (36) is variable as a function of a fuel pressure prevailing in the fuel injector (1) during operation.

Abstract: A fuel injection valve, which may be inserted into a locator bore of a cylinder head of an internal combustion engine, has a sealing ring located peripherally around the fuel injection valve in the locator bore. The sealing ring has a contact surface, having the shape of a spherical segment, toward the fuel injection valve, which presses against a corresponding counter surface, having the shape of a spherical segment, of the fuel injection valve.

Abstract: A fuel injector (1) for fuel injection systems of internal combustion engines is constructed of a solenoid (8), an armature (12) which is acted upon in a closing direction by a restoring spring (10), and a valve needle (3) which is frictionally engaged with the armature (12) to actuate a valve-closure member (4) which together with a valve-seat surface (6) forms a sealing seat. In or on the armature (12) at least a first fuel channel (37) is provided through which fuel flows, where the cross-section of the first fuel channel (37) is dependent on the axial position of the armature (12).