Abstract: An injection valve, in particular an injection valve for an internal combustion engine, is proposed, which includes at least a nozzle body (4), in which a nozzle needle (5) is guided axially displaceably, and an at least one-piece retaining body (7), in which means for actuating the nozzle needle (5) are disposed.

Abstract: A valve for controlling fluids, having an in particular piezoelectric actuator unit for actuating a valve member (10) that is disposed in an at least one-piece valve body (22) and that has at least one displacement piston (11) communicating with the actuator unit and at least one actuating piston (13) operatively connected to the displacement piston (11) via a hydraulic coupler (12), which actuating piston is connected to a valve closing member (14) which cooperates with at least one valve seat (15) and in the closing position disconnects a control chamber (19) from an outlet chamber (20), the hydraulic coupler (12) being provided with a filling device is proposed. The valve closing member (14) has a pistonlike cylindrical region (17; 41; 51), which with the valve body (22) forms at least one filter gap for the fluid to be delivered to the filling device, and at whose level an inlet conduit (26) of the filling device branches off (FIG. 1).

Abstract: A valve for controlling fluids, having an in particular piezoelectric actuator unit (20) for actuating a valve member is proposed, which has at least one adjusting piston (19) and at least one actuating piston (16) that is guided in a valve body (15) and actuates a valve closing body, which valve closing body cooperates with at least one valve seat (24) embodied on the valve body (15) and in the closing direction disconnects a control bore (14) from an outlet chamber (25), from which a return conduit (26) branches off, wherein between the adjusting piston (19) and the actuating piston (16), a hydraulic chamber (18) is disposed, which transmits a motion of the adjusting piston (19) to the actuating piston (16). To keep the size of the actuator unit (20) small, the actuating piston (16), at least when the valve closing body is closed, is supported essentially in a hydraulically force-balanced fashion (FIG. 2).

Abstract: A valve for controlling fluids has a piezoelectric unit (3) for actuating a valve member (2) that is displaceable in a bore (8) of a valve body (9), having at least one control piston (7) and at least one actuating piston (10) for actuating a valve closing member (9). Between the control piston (7) and the actuating piston (10), a hydraulic chamber (11) functioning as a hydraulic coupler is embodied; the actuating piston (10), defining the hydraulic chamber (11), is supported displaceably in a blind bore (12) of the control piston (7), which bore is open in the valve seat direction. A cross-sectional area (A0), bordering the hydraulic chamber (11), of the control piston (7) on the one hand and a smaller cross-sectional area (A1) of the actuating piston (10) and a cross-sectional area (A2) of at least one reducing element (14) determine a boost for the stroke length of the actuating piston (10), during which the at least one reducing element (14) is braced on a stop (15) in the bore (8) (Drawing figure).

Abstract: A valve (1) for controlling liquids is proposed, having a piezoelectric unit (3) for actuating a valve member (2), which member is axially displaceable in a bore (8) of a valve body (9) and on one end has a valve closing member (13) that cooperates with at least one seat (14, 15), provided on the valve body (9), for opening and closing the valve (1). The valve closing member (13) divides a low-pressure region (16) having a system pressure (p_sys) from a high-pressure region (17). To compensate for a leakage quantity from the low-pressure region (16) by drawing hydraulic liquid from the high-pressure region (17), a filling device (26) is provided, which is embodied with a conduit (27) having a throttle bore (28). The diameter of the throttle bore is designed such that a volumetric flow that from the high-pressure region (17), which flow passes through the throttle bore (28), at a defined minimum high pressure (p_R_min) compensates for the leakage quantity from the low-pressure region (16) (FIG. 1).

Abstract: A valve for controlling fluids is provided, having a valve member (3) axially movable in a valve body (5), having a hydraulic chamber (12) acting as a hydraulic booster, and having a filling device (15) to compensate for leakage losses, which device communicates with a high-pressure region (14) and a lowpressure region (13) of the valve and has a throttle body (18). According to the invention, it is provided that the throttle body is movable, as a function of a pressure prevailing in the lowpressure region (13), such that filling of the hydraulic chamber (12) with fluid takes place (FIG. 1).

Abstract: A valve for regulating fluids includes a piezo-electric actor unit (9) for operating a valve member assembly. The valve member assembly has at least one first piston (13) guided in a valve body (10) and a second piston (14). A hydraulic chamber, acting as a hydraulic converter, is disposed between the first and second pistons (13, 14). The second piston operates a valve-closing member (15) disposed on an end facing away from the hydraulic chamber (16). The valve closing member (15) cooperates with at least one valve seat (17) formed on the valve body (10) and in a closed position, separates a system pressure region (18) of the valve (1) from a high pressure region (5). The second piston (14) is surrounded by and supported by an approximately casing-type spacer (22) on the valve body (10).

Abstract: A spring bushing, in particular for prestressing a piezoelectric actuator in a valve for controlling fluids, is disclosed, which is a one-piece deep-drawn part, which is hollow and at least approximately cylindrical. The one-piece body is provided with a number of openings distributed over the circumference and length of the body.

Abstract: The invention relates to a valve for controlling fluids, having a piezoelectric unit (4) for actuating a valve member (3), with which a valve closing member (12) is associated that divides a low-pressure region (16) at system pressure from a high-pressure region (17). The valve member (3) has at least one first piston (9) and one second piston (11), between which a hydraulic chamber (13) is embodied.

Abstract: An injection device for a fuel reservoir injection system is proposed, having an injection nozzle (16), which protrudes into a combustion chamber and can be supplied with fuel from a high-pressure fuel distributor (10) by means of a high-pressure fuel supply path (14, 52, 44, 40), and having a nozzle needle (30), which opens and closes this injection nozzle (16) as a function of the pressure in a control chamber (58). In order to introduce fuel into the control chamber, an inlet conduit (62), which branches from the fuel supply path, feeds into this control chamber (58) and an outlet path (66, 78), which leads from this control chamber (58), permits fuel to flow out of the control chamber. A shutoff valve (70) can close a downstream section (66″) off from an upstream section (66′) of the outlet path. The downstream section and the upstream section of the outlet path feed into a valve chamber (78), which contains a movable shutoff element (76).

Abstract: A feed device for fuel has a feed pump driven by an electric motor and a housing which receives the electric motor. The feed pump and a filter arrangement which has a preliminary pump and a main pump arranged respectively before and behind the feed pump in the fuel flow direction are provided in the housing. The feed pump transports the main flow of fuel through a central recess in the filter pot at the input flow side of the main filter of the filter arrangement. A side channel pump which is open on one side is arranged at the feed pump as a preliminary stage thereof. The fuel can be delivered subsequent to the preliminary filter to a rise pipe and then into a pot housing to a suction area of the main stage of the feed pump.

Abstract: The apparatus for supplying fuel includes a fuel tank and a fuel feed unit in the fuel tank. The fuel feed unit has a main housing, a suction cover arranged in a bottom part of the main housing, a fuel pump and a degassing valve arranged in the suction cover for degassing the fuel pump. The fuel pump itself includes an impeller housing with a circular passage for fuel flow and an electric-motor-driven impeller. The impeller housing is arranged in the main housing and next to the suction cover and it is provided with a degassing passage connecting the circular passage with the degassing valve. To improve starting behavior the fuel feed unit has a degassing valve in the suction cover, which is connected with the circular passage of the impeller housing by a degassing passage. The degassing valve opens to the fuel tank when pressure in the degassing passage exceeds a predetermined value for degassing the fuel pump.

Abstract: In connection with a flow pump, particularly for the conveying of fuel from a fuel tank of a motor vehicle, with a pump chamber (16), an impeller wheel (24) rotating in the pump chamber (16), and two parallel side walls (17, 18) spaced apart from each other and delimiting the pump chamber (16), in one of which a groove-like side channel (26), open toward the pump chamber (16), is disposed, which extends concentrically to the pump axis from a channel start (261) to a channel end (262), a further pump inlet (30) for the connection of a fluid return line (13) and which opens directly into the side channel (26) at a distance from the channel end (262), is provided for the purpose of improved efficiency of the flow pump.

Abstract: The invention relates to a unit for conveying fuel from a supply tank to the internal combustion engine of a motor vehicle, having an electric drive motor and a flow pump (11), driven by it, which has a pump housing (16, 21) permanently connected to the unit housing (32) and forming a pump chamber (17), in which housing conveying means (12) moved by the drive motor revolve, wherein an insert (51) of wear-resistant material is disposed on the at least one housing part (16, 21) that defines the pump chamber (17), the insert forming at least part of a chamber wall (18, 19) which defines the pump chamber (17) in the direction of the axis of rotation (15) of the conveying means (12).

Abstract: The invention relates to a pressure regulator for a fuel system. The pressure regulator includes a housing assembled out of at least two housing parts. A membrane unit is securely installed in a sealed fashion between the housing parts. The securing region that securely holds the two housing parts and the membrane unit in a sealed fashion has an elastic region so that the desired secure connection is assured by simply snapping the two housing parts together. The device is provided in particular for regulating a pressure in a fuel system.

Abstract: A fuel injection pump for internal combustion engines having a plurality of in-line pumping elements, in which there is one pumping element in the injection pump for each individual combustion chamber of the engine. Each pumping element is surrounded by one partial suction chamber, and quantity dividers inserted into inflow and outflow conduits divide the flow of fuel into partial fuel flows so that each partial suction chamber is flushed, whereby no outflowing fuel is capable of mixing with inflowing fuel.