Abstract: In a fuel injection valve having a valve body, which contains a movable injector needle, having an actuating part, which supports the injector needle and communicates with a control pressure chamber, and having a compensation chamber, which communicates with a compensation piston, a closing force that counteracts a dynamic opening force should be reliably exerted on the actuating part. To this end, a spring element that exerts a compensating force on the injector needle is disposed between the injector needle and the compensation piston.

Abstract: A valve for controlling fluids includes a valve housing in which an actuator chamber is embodied, in which chamber a piezoelectric actuator module for actuating a valve member that is axially displaceable in a valve body is disposed, which valve member has an adjusting piston upon which the actuator module acts and also has an actuating piston which is operatively connected to the adjusting piston via a hydraulic coupler and which is in contact with a valve closing member, disposed in a valve chamber, that cooperates with at least one valve seat and downstream thereof a diversion conduit branches off. An axially acting first prestressing spring engages the actuator module, and the adjusting piston is loaded in the direction of the actuator module.

Abstract: A fuel injection system (1) for internal combustion engines includes a plurality of injection valves (5), each provided in an injection line (4) for the fuel, where each injection valve (5) has a nozzle chamber (12) and a control chamber (15), which both communicate with the injection line (4); a valve member (7), which controls the injection openings (11) of the nozzle chamber (12) and which is actuatable via a first control face (13), located in the nozzle chamber (12) and acting in the valve opening direction, and via a second control face (14), located in the control chamber (15) and acting in the valve closing direction; a first valve (18) for controlling the pressure prevailing in the control chamber (15); and a second valve (28) for switching the injection pressure.

Abstract: The invention relates to a valve having a valve needle (2) which is axially displaceable in a bore (5) of a valve body (3) and which on one end has a conical valve needle tip (4). The valve needle tip (4) includes a radial valve sealing face (9), which in the closing position of the valve comes to rest on a conical inner wall (6) of the valve body on the closed end of the bore (5). In the inner wall (6) of the valve body there is at least one opening (7), which connects the bore (5) with the outside (8) of the valve body (3). The valve includes two radial recesses (12, 13, 16, 17), which are disposed in the valve needle tip (4) or in the inner wall (6) of the valve body, and one of the radial recesses (13, 17) is located upstream (10) and the other radial recess (12, 16) is located downstream (11) from the position of the valve sealing face (9), in the closing position of the valve.

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: Fuel injection system comprising a piezoelectric element for controlling the amount of injected fuel and further comprising a control unit for determination of a possible fault of the piezoelectric element or of an electric circuitry driving the piezoelectric element based upon a value related to the capacitance of the piezoelectric element.

Abstract: In a fuel injection system (1) for internal combustion engines, having a plurality of injection valves (4; 104), each provided in a respective fuel injection line (3), which valves each have one nozzle chamber (13), one control chamber (17; 117), one valve member (8; 108), which controls the injection openings (12) of the nozzle chamber (13) and which is actuatable counter to the action of a closing spring (10; 110) via a first control face (14), located in the nozzle chamber (13) and acting in the valve opening direction, and via a second control face (16; 116), located in the control chamber (17; 117) and acting in the valve closing direction, one piston (2), displaceable in the compression direction, which on its face end defines a first compression chamber (18), communicating with the injection line (3), for generating the injection pressure, one first valve (25) for controlling the pressure buildup in the first compression chamber (18), and one second valve (26) for controlling the pressure buildup in th

Abstract: The current invention relates to a valve for controlling fluids, which includes a piezoelectric actuator (2), a transmission mechanism for increasing the stroke of the piezoelectric actuator (2), and a control valve (14) that can be actuated by means of the transmission mechanism. In addition a temperature compensation device (27) is provided to compensate for a length change of the piezoelectric actuator (2) induced by a temperature change. The transmission mechanism is embodied in the form of a diaphragm (3) and increases the stroke of the piezoelectric actuator with a transmission ratio a/b. At the same time, the diaphragm (3) produces a seal between the piezoelectric actuator (2) and the fluid to be controlled.

Abstract: Disclosed is a connection stub and a housing, in particular a high-pressure fuel reservoir, for a fuel injection system for internal combustion engines with a welded connection stub, in which sealing faces between the housing and the connection stub are provided, spatially separately from the weld seam.

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: An injection nozzle with a blind bore is disclosed in which the transition between the blind bore and the nozzle needle seat is rounded. This decreases the tolerance in the flow resistance of the injection nozzle upon a partial stroke of the nozzle needle, and thus makes a more-precise control of the injected fuel quantity possible.

Abstract: The invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine. The fuel injector includes an injector body (2), in whose housing bore (8) a first 3/2-way control valve (6) is received, whose valve body (7) has a slide portion (18) and a seat diameter (11). The valve body (7) of the 3/2-way control valve (6) is actuated via an actuator (40) directly or indirectly via transmission elements (3, 4). By means of the valve body (7) of the 3/2-way control valve (6), a valve member (30) of a further control valve (29) is forcibly controlled via a transmission element (26), which in a first position of the valve body (7) in the housing bore (8) is spaced apart from the valve body by a gap size h1 (25).

Abstract: A fuel injection device (10) is used in internal combustion engines (94). It includes a housing (12) with an injection end (18). A recess (20) extends in the housing (12). An axially movable valve element (24) is disposed in the recess (20); it cooperates with a valve seat and has a pressure face (36), remote from the injection end (18), which axially defines a control chamber (38). A sleeve part (40) is also provided, which radially defines the control chamber (38). A device (55) puts the sleeve part (40) against a first housing portion (16) and the valve element (24) in the direction of the injection end (18) with prestressing. To improve the precision in operation of the fuel injection device (10), it is proposed that the device (55) include separate prestressing devices (46, 50); one prestressing device (50) acts upon the valve element (24), and another prestressing device (46) acts upon the sleeve part (40).

Abstract: An injection for injecting fuel under high pressure in a combustion chamber of an internal combustion engine has a control chamber, a valve body which is pressure loaded from the control chamber, a further control chamber, a nozzle needle which is pressure loaded from the further control chamber, a nozzle inlet, a nozzle chamber provided for the nozzle needle and loaded from the nozzle inlet, a valve body formed as a 3/2-way valve for pressure controlling the injector, a 2/2-way valve for stroke controlling of the injector at a leakage oil side, and a common controller, the valves being controllable either by the common controller or separately from one another.

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.

Abstract: A fuel injection device for an internal combustion engines includes a housing with an injection end. A recess extends inside the housing contains an axially movable valve element, which cooperates with a valve seat and has a pressure surface oriented away from the injection end, which pressure surface axially delimits a control chamber. A device is provided which acts on the valve element counter to the force resultant of the pressure surface. A control valve is connected to the control chamber via a flow throttle. The control valve has at least three connections and at least two switching positions and is connected to a high-pressure fluid inlet and a low-pressure fluid outlet on the one side and be connected to the flow throttle on the other side.

Abstract: The invention relates to a device for injecting fuel into the combustion chamber of an internal combustion engine. A control unit (1) is provided, which contains a housing chamber (4) that is continuously acted on with highly pressurized fuel by means of an inlet from a reservoir (common rail). The highly pressurized fuel is continuously present in the control chamber (6) of a control valve body (5) by means of an inlet throttle (7), wherein the control valve body (5) opens or closes a nozzle inlet (14) to an injection nozzle. The housing chamber (4) of the control unit (1) contains a thrust transmitting member (21) that delimits the control chamber (6), and the thrust transmitting member (21) is supported with a flat face (23) against the housing (2) and contains an outlet throttle (28) that pressure-relieves the control chamber (6) and can be opened by means of a servo valve (24).

Abstract: The invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, with a nozzle needle (3). The pressure increase/pressure decrease in the control chamber (2) can be used to actuate this nozzle needle (3) in the injector body (1) between a position that unblocks injection openings and a position that closes injection openings. The leakage oil side of the control chamber (2) can be acted on via a pressure relief line (6) containing an outlet throttle (7) and via a high-pressure side inlet (8) with an inlet throttle (9), which simultaneously acts on a nozzle chamber (15) in the injector body (1) with pressurized fuel. The pressure change in the control chamber (2) of the injector body (1) takes place by means of a first on-off valve (21) and an additional on-off valve (27), wherein the first on-off valve (21) has an initial stroke (33) in the switching direction (32).

Abstract: The fuel injection system has a pump work chamber (18), which is defined by a pump piston (14) and can be filled with fuel via a communication controlled by a control valve device (30; 130) and can be made to communicate with a relief chamber (31); during a given fuel injection, the pump work chamber (18) is disconnected from the relief chamber (31) by the control valve device (30; 130), and to terminate the fuel injection it is made to communicate with the relief chamber (31) by the control valve device (30; 130). A fuel injection valve (20) of the fuel injection system has an injection valve member (22), which controls at least one injection opening and is urged in the opening direction (28) by the pressure prevailing in the pump work chamber (18), counter to a closing force.

Abstract: A fuel injection system for internal combustion engines, in particular Diesel engines, having a fuel reservoir which is supplied from a high-pressure pump and supplies fuel to a number of injectors corresponding to the number of cylinders of the engine, and has a pressure limiting valve, which is connected sealingly to the fuel reservoir, the pressure limiting valve having a valve housing, a high-pressure region, a low-pressure region, a valve seat oriented toward the inlet, an axially displaceable valve body, and a valve spring urging the valve body in the direction of the valve seat. The pressure limiting valve is integrated—at least partially—with the fuel reservoir, in such a way that at least the valve seat and the valve body are spatially associated with the fuel reservoir, and the seal sealing off the pressure limiting valve from the fuel reservoir is associated with the low-pressure region of the pressure limiting valve.