Abstract: The fuel injection system has one high-pressure fuel pump and one fuel injection valve, communicating with it, for each cylinder of the engine. The fuel pump piston is driven in by the engine and defines a pump work chamber communicating with a pressure chamber of the fuel injection valve. The fuel injection valve has a first hollow injection valve member movable in an opening direction counter to a closing force by the pressure prevailing in the pressure chamber to control at least one first injection opening. A second injection valve member is guided displaceably inside the first injection valve member and is movable counter to a closing force in an opening direction by the pressure prevailing in the pressure chamber member to control at least one second injection opening. One face is associated respectively with the first injection valve member and the second injection valve member and is acted upon by the pressure prevailing in a fuel-filled pressure chamber.

Abstract: A fuel injection system for an internal combustion engine with direct injection includes a fuel injection device (16), which can inject the fuel directly into a combustion chamber of the engine, and which has a valve element (70). The valve element borders on a work chamber (79), and the position of the valve element (70) depends on the pressure in the work chamber (79). A pressure booster piston (54) borders on a control chamber (96) on one side and on a high-pressure chamber (76) on the other. A fuel supply can subject the control chamber (96) to various pressures. To improve the emissions performance of an engine equipped with the fuel injection system, it is proposed that the pressure booster piston (54) be integrated with the fuel injection device (16) and that the high-pressure chamber (76) be integrated with the work chamber (79).

Abstract: A fuel injection system having a high-pressure fuel pump and a fuel injection valve for each engine cylinder. A pump work chamber can be made to communicate with a pressure chamber of the injection valve having a valve member movable by pressure in the pressure chamber to control opening of at least one injection opening. A connection of the pump with a relief chamber is controlled by a first electrically actuated control valve, and a second control valve controls the pressure in a control pressure chamber, which pressure urges the injection valve in the closing direction. A blocking valve is disposed in the connection of the pump with the pressure chamber, and the connection of the pump with the relief chamber, in which the first control valve is disposed, leads away between the pump and the blocking valve.

Abstract: The fuel injection apparatus has a high-pressure fuel pump (10) and a fuel injection valve (12) connected to it for each cylinder of the engine. The high-pressure fuel pump (10) has at least one pump piston (18) that is driven into a stroke motion by the engine and delimits a pump working chamber (22), which is supplied with fuel from a fuel tank (24). A control valve (68) at least indirectly controls a connection (66) of the pump working chamber (22) to a relief chamber (24) and a pressure source (23) in order to fill the pump working chamber (22) during the intake stroke of the at least one pump piston (18). The high-pressure fuel pump (10) has two pump pistons (18, 118), wherein a first pump piston (18) is provided, inside which a second pump piston (118) is guided so that it can slide in an approximately coaxial fashion and wherein the two pump pistons (18, 118) delimit the pump working chamber (22).

Abstract: The invention relates to an apparatus for injecting fuel, with a fuel pump for each cylinder of the internal combustion engine, which contains a pump piston that is driven in a stroke motion. This pump piston delimits a pumping chamber, which is supplied with fuel from a fuel tank. The fuel injection apparatus also has a fuel injection valve (25) that has a pressure chamber (22) connected to the fuel pump (13) and has an injection valve element (18) that controls at least one injection opening (24). The pressure prevailing in a pressure chamber (22) can move the injection valve element (18) in an opening direction counter to a closing force in order to unblock the at least one injection opening (24) while a pressure prevailing in a control chamber (14) acts at least indirectly on the injection valve element (18) in the closing direction. The control chamber (14) can be pressure-relieved by means of a control valve (31) that can be actuated by an actuator (3).

Abstract: The fuel injection system has a high-pressure fuel pump (10) with a fuel injection valve (12) connected to it for each cylinder of the internal combustion engine. A pump piston (18) of the high-pressure fuel pump (10) defines a pump working chamber (22) that communicates with a pressure chamber (40) of the fuel injection valve (12), which has an injection valve element (28) that controls injection openings (32) and can be moved in an opening direction (29) counter to a closing force by the pressure prevailing in the pressure chamber (40). A first control valve (68) controls a connection (66) of the pump working chamber (22) to a relief chamber (24) and a second control valve (70) controls a connection (64) of a control pressure chamber (52), which communicates with the pump working chamber (22), to a relief chamber (24).

Abstract: For each cylinder of the internal combustion engine, the fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve connected to it. A pump piston of the high-pressure fuel pump defines a pump working chamber, which is connected to a pressure chamber of the fuel injection valve, which has an injection valve member, which controls the injection openings and which the pressure prevailing in the pressure chamber can move in an opening direction, counter to a closing force. A first control valve controls a connection between the pump working chamber and a relief chamber, and a second control valve controls a connection between a relief chamber and a control pressure chamber connected to the pump working chamber. A control piston, which is connected to the injection valve member, divides the control pressure chamber into two separate partial chambers, which are connected to each other by means of a throttle restriction.

Abstract: The fuel injection system has a high-pressure fuel pump (10) and a fuel injection valve (12) connected to it for each cylinder of the internal combustion engine. A pump piston (18) of the high-pressure fuel pump (10) delimits a pump working chamber (22) that is connected to a pressure chamber (40) of the fuel injection valve (12), which has an injection valve element (28) that controls injection openings (32) and can be moved in an opening direction (29) counter to a closing force by the pressure prevailing in the pressure chamber (40). A first control valve (68) controls a connection (66) of the pump working chamber (22) to a relief chamber (24) and a second control valve (70) controls a connection (64) of a control pressure chamber (52), which communicates with the pump working chamber (22), to a relief chamber (24). A throttle restriction (63, 65) is respectively provided in connections (62, 64) of the control pressure chamber (52) to the pump working chamber (22) and the relief chamber (24).

Abstract: A solenoid-valve-controlled fuel-injection pump for internal combustion engines, in particular diesel engines, has a solenoid valve (18), whose valve needle (17) separates a high-pressure region (14, 15) from a low-pressure region (21), i.e. connects the high-pressure region and low-pressure region, in the pump housing, via a valve seat (16); the injection period being controlled by the opening of the solenoid valve (18). In addition, a low-pressure compensating piston (24) situated in the low-pressure region (21) is provided in order to compensate for pressure fluctuations in the low-pressure region (21).

Abstract: A fuel injection valve for internal combustion engines, having a housing (1) in which an outer valve needle (20) and an inner valve needle (22) guided in it are disposed in a bore (16). The outer valve needle (20), by a longitudinal motion, controls an outer row (130) of injection openings, and the inner valve needle (22), likewise by means of a longitudinal motion, controls an inner row (230) of injection openings, to which rows (130; 230) of injection openings fuel is delivered at an injection pressure through a high-pressure conduit (10) embodied in the housing (1). A control pressure chamber (52) is embodied in the housing (1); it can be made to communicate with the high-pressure conduit (10), and by means of its pressure, a closing force is exerted at least indirectly on the inner valve needle (22).

Abstract: A fuel injection system, having a fuel injection valve and a control valve, which control valve has a control valve member that is longitudinally displaceable in a control valve bore. A control valve sealing face is embodied on the control valve member; it cooperates with a control valve seat and thus controls the communication between a first pressure space and a second pressure space; the first pressure space communicates with a high-pressure collection chamber. In a valve body, a bore is embodied in which a pistonlike valve needle, with its end toward the combustion chamber, controls the opening of at least one injection opening by executing a longitudinal motion in response to the pressure in a pressure chamber; the pressure chamber communicates with the second pressure space via an inlet conduit.

Abstract: The fuel injection system has one high-pressure fuel pump (10) and one fuel injection valve (12), communicating with it, for each cylinder of the internal combustion engine. A pump piston (18) of the high-pressure fuel pump (10) defines a pump work chamber (22), which communicates with a pressure chamber (40) of the fuel injection valve (12); the fuel injection valve has an injection valve member (28), by which injection openings (32) are controlled and which is movable in an opening direction (29) counter to a closing force by the pressure prevailing in the pressure chamber (40). By means of a control valve (80), a connection (74) of the pump work chamber (22) with a relief chamber (24) is controlled, and having a second control valve (80), by which a connection (74) of a control pressure chamber (62), which communicates with the pump work chamber (22) and is defined by a control piston (60), with a relief chamber (24) is controlled, in which connection a throttle restriction (75) is provided.

Abstract: The fuel injection system has one high-pressure fuel pump (10) with a pump work chamber (22) and one fuel injection valve (12), communicating with the pump work chamber, for each cylinder of the engine. The fuel injection valve (12) has a first injection valve member (28), by which at least a first injection opening (32) is controlled, and which is movable in an opening direction (29) counter to a closing force by the pressure generated in the pump work chamber (22).

Abstract: A fuel injection valve for internal combustion engines, having a housing (12; 48) in which a pistonlike valve member (35; 60) is disposed longitudinally displaceably in a bore (34; 57). The valve member (35; 60) is surrounded, over at least part of its length, by a pressure chamber (37; 68), embodied in the housing (12; 48), that can be filled with fuel at high pressure; the valve member (35; 60) controls the communication of the pressure chamber (37; 68) with at least one injection opening (39; 66). The pressure chamber (37; 68) communicates with a damping chamber (46; 80), embodied in the housing (12; 48), via at least one throttle (44; 78) disposed in the housing (12; 48), so that pressure fluctuations that occur in the damping chamber (46; 60) rapidly fade (FIG. 1).

Abstract: A fuel injection valve includes a housing in which a pistonlike valve member is disposed longitudinally displaceably in a bore to cause at least one injection opening to communicate with a pressure chamber embodied in the housing. An inlet conduit discharges into the pressure chamber to fill the pressure chamber with fuel at high pressure. A fuel-filled control chamber in the housing at least indirectly exerts a force acting in the closing direction on the valve member. The control chamber communicates with the inlet conduit and can be made to communicate via a control valve with a leak fuel chamber. A damping chamber communicates with the inlet conduit via a throttle.

Abstract: The fuel injection system has one high-pressure fuel pump and one fuel injection valve, communicating with it, for each cylinder of the engine. The fuel pump piston is driven in by the engine and defines a pump work chamber communicating with a pressure chamber of the fuel injection valve. The fuel injection valve has a first hollow injection valve member movable in an opening direction counter to a closing force by the pressure prevailing in the pressure chamber to control at least one first injection opening. A second injection valve member is guided displaceably inside the first injection valve member and is movable counter to a closing force in an opening direction by the pressure prevailing in the pressure chamber member to control at least one second injection opening. One face is associated respectively with the first injection valve member and the second injection valve member and is acted upon by the pressure prevailing in a fuel-filled pressure chamber.

Abstract: A stroke-controlled valve as a fuel metering device of an injection system for internal combustion engines has a valve body with a valve seat and a valve needle which is actuatable in the valve body counter to the resistance of a valve needle restoring spring and which has a sealing edge that cooperates with the valve seat. A coupling body with a greater mass than the valve needle is disposed in the valve body, in the axial extension of the valve needle, and is movable coaxially to the valve needle and is actuatable by the valve needle during the opening stroke of the valve needle.

Abstract: For each cylinder of the internal combustion engine, the fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve connected to it. A pump piston of the high-pressure fuel pump defines a pump working chamber connected to a pressure chamber of the fuel injection valve, which has an injection valve member which controls the injection openings and which the pressure prevailing in the pressure chamber can move in an opening direction counter to a closing force. A first control valve controls a connection between the pump working chamber and a relief chamber, and a second control valve controls a connection between the relief chamber and a control pressure chamber, which is connected to the pump working chamber.

Abstract: A fuel injection system having a high-pressure source and an injection valve having a pressure chamber communicating with the high-pressure source, and a valve member controlling at least one injection opening when acted upon by the pressure in the pressure chamber in an opening direction counter to a closing force. A control piston movable with the valve member in the closing direction defines a control pressure chamber which communicates with the high-pressure source and which has a communication controlled by an electrically actuated valve, with a relief chamber. The control valve is opened for fuel injection, so that the control pressure chamber communicates with the relief chamber. The valve member and the control piston move in the opening direction when the control valve is opened, and a limitation in the opening motion of the injection valve member and of the control piston is effected only by a pressure increase in the control pressure chamber from closure of the control valve.

Abstract: A fuel injection valve for internal combustion engines, having a housing (12) in which a pistonlike valve member (35) is disposed longitudinally displaceably in a bore (34) and by a longitudinal motion in an opening direction, with its end toward the combustion chamber, causes at least one injection opening (39) to communicate with a pressure chamber (37) embodied in the housing (12). An inlet conduit (14) is embodied in the housing (12) and discharges into the pressure chamber (37), and by way of it the pressure chamber (37) can be filled with fuel at high pressure. A fuel-filled control chamber (20) is also embodied in the housing (12); the pressure in the control chamber (20) at least indirectly exerts a force acting in the closing direction on the valve member (35). The control chamber (20) communicates with the inlet conduit (14) and can be made to communicate via a control valve (16) with a leak fuel chamber (23), in which a markedly lower pressure prevails than in the inlet conduit (14).