Abstract: An injection device for a fuel reservoir injection system is proposed, having an injection nozzle (16), which protrudes into a combustion chamber and can be supplied with fuel from a high-pressure fuel distributor (10) by means of a high-pressure fuel supply path (14, 52, 44, 40), and having a nozzle needle (30), which opens and closes this injection nozzle (16) as a function of the pressure in a control chamber (58). In order to introduce fuel into the control chamber, an inlet conduit (62), which branches from the fuel supply path, feeds into this control chamber (58) and an outlet path (66, 78), which leads from this control chamber (58), permits fuel to flow out of the control chamber. A shutoff valve (70) can close a downstream section (66″) off from an upstream section (66′) of the outlet path. The downstream section and the upstream section of the outlet path feed into a valve chamber (78), which contains a movable shutoff element (76).

Abstract: A valve for controlling fluids, having a piezoelectric actuator unit for actuating a valve member that is disposed in an at least one-piece valve body and that has at least one displacement piston communicating with the actuator unit and at least one actuating piston operatively connected to the displacement piston via a hydraulic coupler, which actuating piston is connected to a valve closing member which cooperates with at least one valve seat and in the closing position disconnects a control chamber from an outlet chamber, the hydraulic coupler being provided with a filling device. The valve closing member has a pistonlike cylindrical region, which with the valve body forms at least one filter gap for the fluid to be delivered to the filling device, and at whose level an inlet conduit of the filling device branches off.

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 valve (2) for controlling fluids is proposed, with an actuator unit (4), which in particular is piezoelectric, for actuating a valve member assembly (5) that has at least one first piston (8) and one second piston (9), between which a hydraulic chamber (11) is disposed. The valve member assembly (5) actuates a valve closing member (10), which cooperates with at least one valve seat (12). Disposed between the second piston (9) and the valve closing member (10) is an intermediate piston (17), which has a smaller diameter than the second piston (9). The end of the intermediate piston (17) oriented toward the valve closing member (10) and an end of the first piston (8) oriented toward the piezoelectric actuator unit (4) border on a system pressure region (14). A transition region between the second piston (9) and the intermediate piston (17) is disposed in a region (18) whose pressure is less than that of the system pressure region (14).

Abstract: An injection valve for an internal combustion engine, with a nozzle body in which a nozzle needle is guided axially displaceably. An at least one-piece holder body is provided, in which means for actuating the nozzle needle are disposed. The nozzle body has means, which correspond with a holding tool for holding the nozzle body in a defined position relative to the holder body during an assembly.

Abstract: A valve for regulating fluids includes a piezo-electric actor unit (9) for operating a valve member assembly. The valve member assembly has at least one first piston (13) guided in a valve body (10) and a second piston (14). A hydraulic chamber, acting as a hydraulic converter, is disposed between the first and second pistons (13, 14). The second piston operates a valve-closing member (15) disposed on an end facing away from the hydraulic chamber (16). The valve closing member (15) cooperates with at least one valve seat (17) formed on the valve body (10) and in a closed position, separates a system pressure region (18) of the valve (1) from a high pressure region (5). The second piston (14) is surrounded by and supported by an approximately casing-type spacer (22) on the valve body (10).

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 present invention relates to a valve for controlling fluids, which includes a valve member (4) that is actuatable via a piezoelectric actuator (2) and a hydraulic booster (3). The valve further includes a holder (6), a valve piece (7), a shim (8), and a nozzle body (9). The valve piece (7), the shim (8), and the nozzle body (9) are joined together via at least two screws (13), and the screws (13) are disposed radially to a center axis (M-M) of the valve. This makes both a simple design of the valve and economical assembly possible.

Abstract: An injector is proposed, in particular an injector for a combustion engine. It includes at least one nozzle module (3) which has an injection nozzle and a supply line for a fluid under a supply pressure (p_R), and a valve-control module (2), which is in operative connection with the nozzle module (3), and at least one valve-closure member (16) on which the supply pressure (p_R) acts, and includes a piezoelectric actuator (12) which is used to activate the valve-closure member (16) and which is prestressed by a spring (21) in the direction facing away from the valve-closure member (16), the piezoelectric actuator (12) being activated by a valve-control unit (30) which specifies a control gradient (dU/dt). The control gradient (dU/dt) is a variable that is dependent upon the supply pressure (p_R).

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 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. The control chamber is defined by a bush that is displaceable, causing a sealing action, on the end of the nozzle needle remote from the combustion chamber and that is kept in contact against the injector housing with the aid of the nozzle spring.

Abstract: A valve (1) for regulating fluids has a piezoelectric unit (4) for actuating a valve member (3). The valve member is embodied with a control piston (9), adjacent to the piezoelectric unit (4), and with at least one actuating piston (14), adjacent to a valve closing member (15). A hydraulic chamber (16) functioning as a hydraulic booster is disposed between the pistons (9, 14). The valve closing member (15) cooperates with at least one valve seat (18, 19) and divides a low-pressure region (20) from a high-pressure region (21). An electric control unit (12) specifies the trigger voltage for the piezoelectric unit (4) as a function of the pressure level in the high-pressure region (21), a leakage loss from the low-pressure region (20) and the hydraulic chamber (16), and the refilling of the low-pressure region.

Abstract: The invention relates to a valve for controlling fluids, having a piezoelectric unit (4) for actuating a valve member (3), with which a valve closing member (12) is associated that divides a low-pressure region (16) at system pressure from a high-pressure region (17). The valve member (3) has at least one first piston (9) and one second piston (11), between which a hydraulic chamber (13) is embodied.

Abstract: A valve for controlling fluids has a piezoelectric unit (3) for actuating a valve member (2) that is displaceable in a bore (8) of a valve body (9), having at least one control piston (7) and at least one actuating piston (10) for actuating a valve closing member (9). Between the control piston (7) and the actuating piston (10), a hydraulic chamber (11) functioning as a hydraulic coupler is embodied; the actuating piston (10), defining the hydraulic chamber (11), is supported displaceably in a blind bore (12) of the control piston (7), which bore is open in the valve seat direction. A cross-sectional area (A0), bordering the hydraulic chamber (11), of the control piston (7) on the one hand and a smaller cross-sectional area (A1) of the actuating piston (10) and a cross-sectional area (A2) of at least one reducing element (14) determine a boost for the stroke length of the actuating piston (10), during which the at least one reducing element (14) is braced on a stop (15) in the bore (8) (Drawing figure).

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: An injection valve, in particular an injection valve for an internal combustion engine, is proposed, which includes at least a nozzle body (4), in which a nozzle needle (5) is guided axially displaceably, and an at least one-piece retaining body (7), in which means for actuating the nozzle needle (5) are disposed.

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: A valve for controlling fluids, having an in particular piezoelectric actuator unit for actuating a valve member (10) that is disposed in an at least one-piece valve body (22) and that has at least one displacement piston (11) communicating with the actuator unit and at least one actuating piston (13) operatively connected to the displacement piston (11) via a hydraulic coupler (12), which actuating piston is connected to a valve closing member (14) which cooperates with at least one valve seat (15) and in the closing position disconnects a control chamber (19) from an outlet chamber (20), the hydraulic coupler (12) being provided with a filling device is proposed. The valve closing member (14) has a pistonlike cylindrical region (17; 41; 51), which with the valve body (22) forms at least one filter gap for the fluid to be delivered to the filling device, and at whose level an inlet conduit (26) of the filling device branches off (FIG. 1).

Abstract: A valve for controlling fluids, having an in particular piezoelectric actuator unit (20) for actuating a valve member is proposed, which has at least one adjusting piston (19) and at least one actuating piston (16) that is guided in a valve body (15) and actuates a valve closing body, which valve closing body cooperates with at least one valve seat (24) embodied on the valve body (15) and in the closing direction disconnects a control bore (14) from an outlet chamber (25), from which a return conduit (26) branches off, wherein between the adjusting piston (19) and the actuating piston (16), a hydraulic chamber (18) is disposed, which transmits a motion of the adjusting piston (19) to the actuating piston (16). To keep the size of the actuator unit (20) small, the actuating piston (16), at least when the valve closing body is closed, is supported essentially in a hydraulically force-balanced fashion (FIG. 2).

Abstract: A valve for controlling liquids is embodied with a piezoelectric unit (3) for actuating a valve member (2) that is axially displaceable in a bore (8) of a valve body (9). The valve member (2), which has at least one control piston (7) and at least one actuating piston (10), is assigned a valve closing member (13), which cooperates with at least one valve seat (16, 17) provided on the valve body (9) for opening and closing the valve (1), and which divides a low-pressure region (16) at.system pressure from a high-pressure region (17). A hydraulic chamber (11) between the control piston (7) and the actuating piston (10) functions as a tolerance compensation element for the piezoelectric unit (3) and as a hydraulic step-up means.

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).