Abstract: The invention relates to a fuel injector, in particular a common rail injector, for injecting fuel into a combustion chamber of an internal combustion engine. The fuel injector has a multi-part injection valve element, which is adjustable between a closing position and an opening position and includes a first part and at least one second part that is adjustable relative to the first part. The first and second parts are coupled to one another via a hydraulic coupler volume. According to the invention, it is provided that the first part is guided in the second part, or the second part is guided in the first part, and that the coupler volume communicates with an injector volume via at least one throttle arrangement. The throttle arrangement is embodied such that the volumetric through flow increases only disproportionately little with an increasing pressure difference between the coupler volume and the injector volume.

Abstract: The invention relates to an area of intersection between a high-pressure chamber and a high-pressure duct. To increase the strength in the area of intersection, it is possible to round the area of intersection. The area of intersection includes at least one planar area or an area that is curved markedly less than the remaining area of intersection. The planar area may also be embodied as only nearly planar. The high-pressure chamber and the high-pressure duct are also called functional chambers. By means of the planar or nearly planar area, an intersection geometry is created, in which tensile stresses of the functional chambers that occur upon subjection to pressure are not superimposed directly and add up as they do in conventional intersection geometries.

Abstract: The invention relates to a method for producing a fuel injection valve (10; 10a; 60; 60a), in which a valve needle (40; 40a; 62; 62a) which closes at least one fuel outlet opening (49) is inserted into an injector housing (11), wherein that end of the valve needle (40; 40a; 62; 62a) which lies opposite the at least one fuel outlet opening (49) is guided in a valve element (32) which has a pressurized control chamber (37) which is filled with fuel, wherein the control chamber (37) can be closed on the side which faces away from the valve needle (40; 40a; 62; 62a) by a closing element (23) which forms a passage during opening and is connected at least indirectly to a fuel return line (5) which is under low pressure, wherein fuel volume which is present in the control chamber (37) flows away through the passage after opening of the control chamber (37) by means of the closing element (23), wherein the valve needle (40; 40a; 62; 62a) moves in the direction of the closing element (23), wherein the at least one fue

Abstract: The invention relates to a fuel injector with an injector housing which has a high-pressure fuel connection which is connected to a central high-pressure fuel source outside the injector housing, and with a pressure chamber within the injector housing. According to the pressure in a coupling chamber, fuel under a high pressure is injected from the pressure chamber into a combustion chamber of an internal combustion engine when a nozzle valve opens. The nozzle valve has a combustion chamber-remote end with a control pressure surface which is acted upon in the coupling chamber by the coupling chamber pressure. In order to create a fuel injector which can be produced inexpensively, the nozzle valve has at least one low-pressure surface which is averted from the combustion chamber and acted upon with low pressure.

Abstract: Disclosed is a fuel injection device comprising a housing and a valve element disposed therein and cooperating with a valve seat located in the area of at least one fuel discharge port. The valve element is composed of several parts while at least two parts of the valve element are coupled to each other via a hydraulic coupler.

Abstract: The invention relates to a fuel injector comprising an injector housing having a pressure chamber from which fuel subjected to a high pressure is injected into a combustion chamber of an internal combustion engine when the pressure in a control chamber expands into a pressure relief chamber by a control valve device. The aim of the invention is to create a fuel injector which has a long service life even though subjected to high pressures. To this end, the injector includes a low-pressure supply line which is connected to a low-pressure return line by a purge path extending through the pressure relief chamber.

Abstract: The invention relates to a fuel injector (1) having a high pressure region (32) which contains fuel that is under high pressure during operation, and a low pressure region (38) in which a lower pressure is present during operation than in the high pressure region (32). A sensor (12) is located in the low pressure region (38) and a transmission means (9) is arranged such that a force which is equal to the pressure of the fuel in the high pressure region (32) is exerted on the sensor (12) at least some of the time.

Abstract: The invention relates to an injector for injecting fuel into combustion chambers of internal combustion engines, in particular a common rail injector. The injector has a high-pressure region and a valve element which is axially adjustable between a closed position and an open position in which the flow of fuel is enabled. According to the invention, it is provided that the valve element includes a first partial element and at least one separate second partial element, which partial elements are hydraulically coupled to one another by a coupler chamber. The coupler chamber is hydraulically connected only in one axial direction to the high-pressure region of the injector.

Abstract: The invention relates to a fuel injector and, in particular, to a common-rail injector for injecting fuel into a combustion chamber of an internal combustion engine with a multi-part injection valve element, which can be adjusted between an open position and a closed position. A first part and a second part of the injection valve element are coupled to one another via a hydraulic coupler, which is bounded radially by a first guide for the first part and by a second guide for the second part. According to the invention, at least some sections of the first and the second guide are surrounded at their outer radii by fuel under high pressure, and the pressure realized in the hydraulic coupler is lower than the pressure radially outside the guides.

Abstract: A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine. A fuel supply line enters an injector housing from a high-pressure fuel source which can be hydraulically connected to a pressure chamber. A 3/2 directional control valve for injecting fuel into the combustion chamber has a valve piston which can be moved axially back and forth between a rest position and an injection position. The 3/2 directional control valve, by a first end face of the valve piston, is hydraulically coupled to and can be activated by a piezoelectric actuator. The 3/2 directional control has a ball element which is connected to a second end face of the valve piston and, in the rest position, can be moved against a first sealing edge and, in the injection position, can be moved against a second sealing edge.

Abstract: An apparatus for injecting fuel into an internal combustion engine having a fuel injector acted on with highly pressurized fuel actuated by means of a metering valve device that is able to control the pressure in a pressure booster control chamber so that in a pressure booster pressure chamber delimited by a pressure booster piston which can be filled via a check valve with high-pressure fuel and communicates with an injection valve member pressure chamber, the pressure booster piston increases the pressure, causing an injection valve member for injecting fuel to open.

Abstract: The invention relates to an injector, in particular, a common-rail injector for injection of fuel into a combustion chamber of an internal combustion engine. An injection valve element, adjustable between a closed position and an open position, is controllable by means of a control valve. The control valve has a control valve element, adjustable between a closed position and an open position by means of an actuator, which in the closed position is an at least almost pressure-equalized and has a sealing line which cooperates in a sealing manner with a control valve seat. The sealing line of the control valve element is lifted off the control valve seat in the open position and hence opens fuel flow from a high pressure region to a low pressure region of the injector. According to the invention, the control valve element has a support region extending over the sealing line in a radial direction to the high pressure region.

Abstract: The invention relates to a fuel injection valve for internal combustion engines, having a valve body, in which a pressure chamber is configured. A valve needle is disposed in the pressure chamber in a longitudinally displaceable manner. The valve body has a valve seat which interacts with a sealing surface configured on the valve needle. The valve seat delimits the pressure chamber, thus enabling or interrupting a fuel flow to at least one injection opening by the interaction of the valve needle with the valve seat. To this end, the fuel flow to the injection openings occurs between the valve needle and the wall of the pressure chamber, through a sharp-edged gap throttle which is formed between the valve needle and the wall of the pressure chamber.

Abstract: The invention relates to a fuel injector, in particular a common rail injector, for injecting fuel into a combustion chamber of an internal combustion engine. The fuel injector has a multi-part injection valve element, which is adjustable between a closing position and an opening position and includes a first part and at least one second part that is adjustable relative to the first part. The first and second parts are coupled to one another via a hydraulic coupler volume. According to the invention, it is provided that the first part is guided in the second part, or the second part is guided in the first part, and that the coupler volume communicates with an injector volume via at least one throttle arrangement. The throttle arrangement is embodied such that the volumetric through flow increases only disproportionately little with an increasing pressure difference between the coupler volume and the injector volume.

Abstract: The invention relates to an area of intersection between a high-pressure chamber and a high-pressure duct. To increase the strength in the area of intersection, it is possible to round the area of intersection. The area of intersection includes at least one planar area or an area that is curved markedly less than the remaining area of intersection. The planar area may also be embodied as only nearly planar. The high-pressure chamber and the high-pressure duct are also called functional chambers. By means of the planar or nearly planar area, an intersection geometry is created, in which tensile stresses of the functional chambers that occur upon subjection to pressure are not superimposed directly and add up as they do in conventional intersection geometries.

Abstract: The invention relates to a fuel injector comprising an injector housing having a pressure chamber from which fuel subjected to a high pressure is injected into a combustion chamber of an internal combustion engine when the pressure in a control chamber expands into a pressure relief chamber by a control valve device. The aim of the invention is to create a fuel injector which has a long service life even though subjected to high pressures. To this end, the injector includes a low-pressure supply line which is connected to a low-pressure return line by a purge path extending through the pressure relief chamber.

Abstract: The invention relates to an injector for injecting fuel into combustion chambers of internal combustion engines, in particular a common rail injector. The injector has a high-pressure region and a valve element which is axially adjustable between a closed position and an open position in which the flow of fuel is enabled. According to the invention, it is provided that the valve element includes a first partial element and at least one separate second partial element, which partial elements are hydraulically coupled to one another by a coupler chamber. The coupler chamber is hydraulically connected only in one axial direction to the high-pressure region of the injector.

Abstract: Proposed is a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine. The fuel injector has a housing in which are arranged an injection valve element with a nozzle needle, a pressure boosting device, and a first control valve, and a second control valve. The first control valve controls a control space of the nozzle needle and the second control valve controls a differential pressure space of the pressure boosting device. A first return flow connection is provided for discharging the control quantity of the control space of the nozzle needle, and a second return flow connection is provided for discharging the control quantity of the pressure boosting device. The two return flow connections are arranged on different housing parts of the housing.

Abstract: The invention relates to a fuel injector (1) for injecting fuel into a combustion chamber of an internal combustion engine, said injector comprising a nozzle needle (4) which moves back and forth in an injector body (2) and/or in a nozzle body (3) in order to release and/or to close at least one injection opening (5) in the nozzle body (3). The movement of the nozzle needle (4) can be controlled by a control valve which co-operates with a control chamber (6). The control valve comprises a valve needle (7) which is guided back and forth and can be moved in relation to a sealing seat (8) in order to ventilate the control chamber (6) in a fuel return (8) when the valve needle (7) is lifted from the sealing seat (8). The valve needle (7) has a differential surface which enables the needle to be subjected to a fuel pressure and held in the direction of the sealing seat (8).

Abstract: The invention relates to a fuel injector with an injector housing which has a high-pressure fuel connection which is connected to a central high-pressure fuel source outside the injector housing, and with a pressure chamber within the injector housing. According to the pressure in a coupling chamber, fuel under a high pressure is injected from the pressure chamber into a combustion chamber of an internal combustion engine when a nozzle valve opens. The nozzle valve has a combustion chamber-remote end with a control pressure surface which is acted upon in the coupling chamber by the coupling chamber pressure. In order to create a fuel injector which can be produced inexpensively, the nozzle valve has at least one low-pressure surface which is averted from the combustion chamber and acted upon with low pressure.