Abstract: The invention relates to a device for injecting fuel into the combustion chambers of an internal combustion engine, with a pump (2), which supplies highly pressurized fuel to a high-pressure accumulation chamber (3). Starting from this high-pressure accumulation chamber (3), a high-pressure supply line leads to an injector (5), which contains a metering valve (7) that acts on an injection nozzle (24) with fuel. The metering valve (7) is associated with a damping throttle (26), which is connected to a part of the high-pressure region.

Abstract: A fuel injection system with a fuel injection valve (15) and a control valve (50), which control valve (50) has a control valve member (54) that can move longitudinally in a control valve bore (52). The control valve member (54) is provided with a control valve sealing surface (55), which cooperates with a control valve seat (56) and thereby controls the connection between a first pressure chamber (57) and a second pressure chamber (58), where the first pressure chamber (57) is connected to a high-pressure accumulation chamber (10). A bore (30) is embodied in a valve body (25) and contains a piston-shaped valve needle (32) whose end oriented toward the combustion chamber controls the opening of at least one injection opening (38) by virtue of the fact that it executes a longitudinal movement due to the impingement of the pressure in a pressure chamber (31); the pressure chamber (31) is connected to the second pressure chamber (58) by means of a supply conduit (28).

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: A fuel injection system, having a fuel injection valve (15) and a control valve (50), which control valve (50) has a control valve member (54) that is longitudinally displaceable in a control valve bore (52). A control valve sealing face (55) is embodied on the control valve member (54); it cooperates with a control valve seat (56) and thus controls the communication between a first pressure space (57) and a second pressure space (58); the first pressure space (57) communicates with a high-pressure collection chamber (10). In a valve body (25), a bore (30) is embodied in which a pistonlike valve needle (32), with its end toward the combustion chamber, controls the opening of at least one injection opening (38) by executing a longitudinal motion in response to the pressure in a pressure chamber (31); the pressure chamber (31) communicates with the second pressure space (58) via an inlet conduit (28).

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: 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 fuel injection valve (1), which has a valve body (20) in which a valve member (60) is disposed axially movably in a bore (62), which valve member is longitudinally displaceable, hydraulically controlled by the fuel pressure in a pressure chamber (64), counter to a closing force and thereby controls at least one injection opening (68). A control valve (30) is disposed in the fuel injection valve; it includes a control valve member (32) that is longitudinally displaceable in a control valve bore (38), which control valve member (32), in a first position, opens the communication from a high-pressure fuel source (10) to the pressure chamber (64) and, in a second position, connects the pressure chamber (64) to a control chamber (50) and thereby interrupts the communication with the high-pressure fuel source (10).

Abstract: The fuel injection device has a fuel injection valve that has an injection valve member, which is guided so that it can slide in a valve body and controls at least one injection opening and which can be moved in the opening direction, counter to the force of a closing spring contained in a spring chamber by means of the pressure prevailing in a pressure chamber of the fuel injection valve. Highly pressurized fuel is supplied from a high pressure source to the pressure chamber of the fuel injection valve. An electrically controlled valve at least indirectly controls a connection of the pressure chamber to a relief chamber and connects the pressure chamber to the relief chamber in order to terminate the fuel injection. The pressure chamber of the fuel injection valve has a connection to the spring chamber, which connection contains a check valve that opens toward the pressure chamber.

Abstract: A geared pump, having a housing (18), two gear wheels (14, 16) that are disposed in the housing and mesh with one another, and at least one groove (22) that is embodied in the housing on the pressure side of the geared pump, cavitation damage at high rpm is to be avoided. To that end, it is provided that the groove has a first portion (24), which extends from the pressure side, and in which the bottom of the groove (22) has a slight spacing from the tips of the teeth (20) of the gear wheel, and a second portion (26), which adjoins the first portion and in which the bottom of the groove (22) has a maximum spacing from the tooth tips that is greater than the spacing in the first portion, and the first portion extends over a smaller angular range (&agr;) than the second portion, and the groove extends over a total angular range (&agr;, &bgr;) that is somewhat greater than angular spacing between two teeth (20).

Abstract: A method of operating internal combustion engine in which a first fuel pump delivers fuel from a fuel tank, and at least a part of the delivered fuel travels via at least one inlet valve into at least one working chamber of a second fuel pump embodied as a positive-displacement pump which delivers the fuel to a fuel accumulation line. In order to increase the efficiency during operation of the engine, the inlet valve opens when there is a particular pressure difference between the working chamber and a region upstream of the inlet valve and that the pressure upstream of the inlet valve is changed in order to change the relative opening duration of the inlet valve and therefore the fuel quantity arriving into the working chamber of the second fuel pump.

Abstract: A fuel injection system for internal combustion engines with a pressure step-up means is proposed, in which the fuel is pumped out of the low-pressure supplier into the injection nozzle via a feed line and is measured correctly in terms of time and quantity via a control line by the high-pressure part of the injection pump.

Abstract: A geared pump, having a housing (18), two gear wheels (14, 16) that are disposed in the housing and mesh with one another, and at least one groove (22) that is embodied in the housing on the pressure side of the geared pump, cavitation damage at high rpm is to be avoided. To that end, it is provided that the groove has a first portion (24), which extends from the pressure side, and in which the bottom of the groove (22) has a slight spacing from the tips of the teeth (20) of the gear wheel, and a second portion (26), which adjoins the first portion and in which the bottom of the groove (22) has a maximum spacing from the tooth tips that is greater than the spacing in the first portion, and the first portion extends over a smaller angular range (&agr;) than the second portion, and the groove extends over a total angular range (&agr;, &bgr;) that is somewhat greater than angular spacing between two teeth (20).

Abstract: A fuel injection valve for a high-pressure injection of fuel from a central high-pressure reservoir into combustion chambers of an internal combustion engine, wherein, by means of an inlet throttle bore, the high-pressure reservoir is operationally connected to a control chamber which controls the opening and closing of the fuel injector, and wherein the control chamber communicates with an on-off valve by means of an outlet throttle bore. The inlet throttle bore is aligned eccentrically in relation to the control chamber.

Abstract: A fuel injection valve for high-pressure injection of fuel from a central high-pressure line into combustion chambers of an internal combustion engine, which includes a switching valve with a valve seat and a valve ball; the valve ball in the opened state is lifted from the valve seat by means of a high-pressure jet which is supplied from a throttle bore by a pressure chamber operatively connected to a central high-pressure line. The transition from the throttle bore to the valve seat is embodied as a diffuser.

Abstract: An electrically controlled valve which is used for controlling the opening area of a connection between a high pressure chamber and a low pressure chamber. The valve is embodied as a solenoid valve and has a valve seat on which a deflection point is provided downstream of a downstream edge of the valve member in the through flow direction. By means of a flow deflection, the fluid passing through is conveyed against an annular face provided on a valve member. The resulting pressure accelerates the opening of the valve. The solenoid valve is designated for use in fuel injection pumps in motor vehicles.

Abstract: A fuel injection device for internal combustion engines with a high pressure fuel pump that delivers fuel from a low pressure chamber via high pressure lines to at least one injection valve that protrudes into the combustion chamber of the engine to be fed. The device includes a through flow limiting valve that defines a maximum fuel flow quantity in one or a number of high pressure lines and has a valve member, which can move axially and in its closed position, can be brought against a valve seat counter to the force of a restoring spring by fuel flowing toward the injection valve when a maximum fuel flow quantity is exceeded. Wherein the fuel flow through the valve member that is lifted up from its seat can be adjusted in at least one throttle location in the valve member.