Abstract: A high-pressure fuel pump includes a pressure-limiting valve that opens from a high-pressure region of the high-pressure fuel pump towards a compression chamber or towards a low-pressure region of the high-pressure fuel pump. The pressure-limiting valve includes a valve body with a valve seat surface that tapers against the opening direction of the pressure-limiting valve, a spherical valve element, and a valve spring, which presses the spherical valve element against the opening direction of the pressure-limiting valve towards the valve seat surface. When the pressure-limiting valve is closed, the valve element and the valve seat surface bear against one another over a contact line, and a gap is formed between the valve element and valve body, next to the contact line. This gap is asymmetrically narrower upstream of the contact line than downstream of the contact line.

Abstract: An injector in which it is possible to switch a pressure booster on or off so that it is possible to control not only the injection duration, but also the progression of the injection pressure within a broad range during the injection.

Abstract: A fuel injection device, which has: a nozzle needle, guided displaceably in a nozzle body, which as a function of its position opens or closes at least one injection opening, in which a control chamber, to which fuel can be delivered under pressure via an inlet throttle and from which fuel can be diverted, controlled by a control valve, via an outlet throttle, is provided at a piston face of the nozzle needle facing away from the injection opening, and in which in operation, the position of the nozzle needle is controlled by a pressure difference between the pressure in the control chamber and the pressure of the fuel at the end, toward the injection opening, of the nozzle needle, is characterized in that the nozzle needle is surrounded, over at least part of its length, during operation by fuel at high pressure, such that only in the regions of the nozzle needle near the injection opening and in the control chamber can a lower pressure, differing from the high fuel pressure, occur.

Abstract: The invention relates to a fuel filter, which in particular comprises a rodlike filter body which can be used in a common rail system, for filtering soiled fuel before it enters an injector. The filter body has outlet openings on its circumference that are preferably produced by means of a laser process and which have rounded places, produced by a hydroerosive process, in the region of the transition from the inner wall to the outlet opening.

Abstract: A fuel injection device, which has: a nozzle needle, guided displaceably in a nozzle body, which as a function of its position opens or closes at least one injection opening, in which a control chamber, to which fuel can be delivered under pressure via an inlet throttle and from which fuel can be diverted, controlled by a control valve, via an outlet throttle, is provided at a piston face of the nozzle needle facing away from the injection opening, and in which in operation, the position of the nozzle needle is controlled by a pressure difference between the pressure in the control chamber and the pressure of the fuel at the end, toward the injection opening, of the nozzle needle, is characterized in that the nozzle needle is surrounded, over at least part of its length, during operation by fuel at high pressure, such that only in the regions of the nozzle needle near the injection opening and in the control chamber can a lower pressure, differing from the high fuel pressure, occur.

Abstract: A fuel injection valve for internal combustion engines has a valve body in which a pistonlike valve member is longitudinally displaceably disposed in a bore. The valve member is surrounded, over at least part of its length, by a pressure chamber that can be filled with fuel. On its end toward the combustion chamber, a valve seat is embodied in the bore, on which seat the valve member comes to rest with a valve sealing face in a closing position, so that the pressure chamber is disconnected from at least one injection opening located downstream of the valve sealing face. First and second parallel annular grooves are formed in the end region of the valve member disposed axially toward the valve seat and the valve sealing face is disposed between these two annular grooves.

Abstract: The fuel injection system has one high-pressure fuel pump and one fuel injection valve for each cylinder of the engine. The fuel injection valve has a first hollow injection valve member and a second valve member guided displaceably, inside the first valve member for controlling first and second opening(s), respectively into the associated engine cylinder. The second valve member is movable by the pressure prevailing in a pressure chamber in an opening direction counter to a closing force and is acted upon at least indirectly by the pressure prevailing in a fuel-filled control chamber, which pressure is controllable as a function of operating parameters of the engine such that the second injection valve member, by means of the pressure prevailing in the control chamber, can be blocked, independently of an opening motion of the first injection valve member in a position that closes the at least one second injection opening.

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 suction jet pump for delivering fuel from a tank to the internal combustion engine of a motor vehicle is driven by fuel flowing back from the engine and delivers fuel from a tank into a collecting receptacle of a fuel delivery unit. The suction power of the pump is not limited by the propulsive jet lying against the housing wall so that the entire propulsive jet surface is no longer available for the entrainment of fuel, as in the prior art, but instead the fuel is aspirated from intake openings, which are disposed opposite each other in pairs. This permits the suction power to be noticeably increased.

Abstract: The fuel injection system has one high-pressure fuel pump and one fuel injection valve for each cylinder of the engine. The fuel injection valve has a first hollow injection valve member and a second valve member guided displaceably inside the first valve member for controlling first and second opening(s), respectively into the associated engine cylinder. The second valve member is movable by the pressure prevailing in a pressure chamber in an opening direction counter to a closing force, and is acted upon at least indirectly by the pressure prevailing in a fuel-filled control chamber, which pressure is controllable as a function of operating parameters of the engine such that the second injection valve member, by means of the pressure prevailing in the control chamber, can be blocked, independently of an opening motion of the first injection valve member, in a position that closes the at least one second injection opening.

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 suction jet pump for delivering fuel from a tank to the internal combustion engine of a motor vehicle is driven by fuel flowing back from the engine and delivers fuel from a tank into a collecting receptacle of a fuel delivery unit. The suction power of the pump is not limited by the propulsive jet lying against the housing wall so that the entire propulsive jet surface is no longer available for the entrainment of fuel, as in the prior art, but instead the fuel is aspirated from intake openings, which are disposed opposite each other in pairs. This permits the suction power to be noticeably increased.

Abstract: The fuel supply apparatus has a fuel tank (12), which has a number of partial regions (14, 16) whose bottoms (15, 17) are separate from one another and which contains a delivery unit (20) that supplies fuel at least indirectly from a first partial region (14) of the fuel tank (12) to an internal combustion engine (10) of the motor vehicle. A jet pump (40) delivers fuel from another partial region (16) of the fuel tank (12) into its first partial region (14), wherein the jet pump (40) has a propellant quantity supply unit (50) that supplies a propellant quantity of fuel to the jet pump (40), and wherein the jet pump (40) has a supply line (42, 56) through which the fuel supplied by the jet pump (40) travels into the first partial region (14) of the fuel tank (12).

Abstract: A suction jet pump for delivering fuel from a tank to an internal combustion is driven by fuel and delivers fuel from a tank into a collecting receptacle of a fuel delivery unit. The pump achieves a greater surface area of the jet with the same volumetric flow of the propulsion jet and the same velocity of the jet, and thus achieves a higher delivery capacity than known devices. The efficiency is increased significantly. A pin is disposed in the cross section of the nozzle outlet, which pin extends into a mixing chamber and increases the surface area of the jet.

Abstract: A fuel injection valve for internal combustion engines, having a valve body (1), in which a pistonlike valve member (5) is longitudinally displaceably disposed in a bore (3). The valve member (5) is surrounded, over at least part of its length, by a pressure chamber (7) that can be filled with fuel. On its end toward the combustion chamber, a valve seat (18) is embodied in the bore (3), on which seat the valve member (5) comes to rest with a valve sealing face (26) in a closing position, so that the pressure chamber (7) is disconnected from at least one injection opening (20) located downstream of the valve sealing face (18). In the end region of the valve member (5), a first annular groove (30) an a second annular groove (32), parallel to it and disposed axially toward the valve seat (18), are embodied, and the valve sealing face (26) is disposed between these two annular grooves (30; 32).

Abstract: A fuel injection valve for internal combustion engines with a valve member that is guided so that the valve member can move axially in a bore of the valve body. The valve member, on an end oriented toward the combustion chamber of the engine, has a conical valve sealing surface with which the valve member cooperates with a conical valve seat surface at the closed, combustion chamber end of the bore of the valve member. The conical valve sealing surface on the valve member is divided into two regions that have different cone angles, at the transition of which a transition region is formed. The transition region is delimited by an upstream and a downstream valve sealing edge, where the difference between the cone angle of the transition region and the cone angle of the valve sealing surface is smaller than the difference between the cone angle of the downstream region and the cone angle of the valve sealing surface (inverse seat angle differential).