Abstract:
The invention relates to an injection device, in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve unit which comprises a valve needle, an injection chamber having at least one injection opening, and a control chamber, wherein the injection device is designed so that a pressure differential between the injection chamber and the control chamber brings about a displacement of the valve needle between an open position in which the valve needle releases a fluid flow through the injection opening, and a closed position in which the valve needle closes off the injection opening. The injection device also has a pump unit integrated in the injection device. The pump unit is designed so as to draw in fluid from the fluid inlet during operation and to provide said fluid to the valve unit under increased pressure.
Abstract:
A fuel injection valve for internal combustion engines, having a housing (1) in which a pistonlike outer valve needle (10) is disposed longitudinally displaceably in a bore (3) and cooperates with a valve seat (13), embodied on the end of the bore (3) toward the combustion chamber, to control at least one injection opening (7). A control chamber (24) is embodied in the housing (1), the pressure in the control chamber (24) being regulatable by a valve (33), and by the pressure in the control chamber (24) a closing force is exerted at least indirectly on the outer valve needle (10) in the direction of the valve seat (13). At least one pressure face (9; 101) is embodied on the outer valve needle (10) and is acted upon by the pressure in a pressure chamber (5), which is embodied between the outer valve needle (10) and the wall of the bore (3) and extends as far as the valve seat (13), so that an opening force on the outer valve needle (10) results that is oriented counter to the closing force. An inner valve needle (12) is guided in the outer valve needle (10) and controls at least one additional injection opening (7) on the valve seat (13) and is acted upon by the pressure in the control chamber (24) at least indirectly in the direction of the valve seat (13) (FIG. 1).
Abstract:
The invention relates to an injection device (1), designed in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve needle (14), an injection chamber (12) having at least one injection opening (44), and a control chamber (20). The injection device (1) is designed such that a pressure differential between the injection chamber (12) and the control chamber (20) brings about a displacement of the valve needle (14) between an open position in which a fluid flow through the injection opening (44) from the injection chamber (12) is released, and a closed position, in which the injection opening (44) is closed off. The injection chamber (22) and the control chamber (20) are hydraulically connected to an inlet (40, 42; 9), such that a pressure rise in the inlet (40, 42; 9) results in a pressure rise in the injection chamber (12), and a pressure rise in the control chamber (20) delayed in time relative to the pressure rise in the injection chamber (12), and said pressure differential brings about a displacement of the valve needle (14) from the closed position into an open position.
Abstract:
A fuel injection valve in which a pistonlike outer valve needle is disposed longitudinally displaceably in a bore and cooperates with a valve seat to control at least one injection opening. A control chamber regulatable by a valve is provided and pressure in the control chamber exerts a closing force at least indirectly on the outer valve needle in the direction of the valve seat. A pressure face embodied on the outer valve needle is acted upon by the pressure in a pressure chamber, which is embodied between the outer valve needle and the wall of the bore and extends as far as the valve seat, so that an opening force on the outer valve needle results that is oriented counter to the closing force. An inner valve needle is guided in the outer valve needle and controls at least one additional injection opening and is acted upon by the pressure in the control chamber at least indirectly in the direction of the valve seat.
Abstract:
The valve having a valve member guided displaceably in the direction of its longitudinal axis protrudes into a valve pressure chamber and has a sealing face extending transversely to axis, has a sealing face, which it cooperates with a valve seat, extending transversely to axis, for at least extensively closing off an opening, surrounded by the valve seat, from the valve pressure chamber. The sealing face is surrounded by an annular face, which when the valve member rests on the valve seat is disposed at a slight spacing from the valve seat. The valve member has a plurality of apertures, distributed over its circumference, through which the opening communicates with the valve pressure chamber when the valve member is resting on the valve seat.
Abstract:
A sheathed element glow plug includes an integrated combustion chamber pressure sensor for a self-igniting internal combustion engine for measuring combustion chamber pressures, in particular for combustion chamber signal-based engine control. The sheathed element glow plug has a heating element and a glow plug housing, as well as a glow plug axis. The glow plug housing has a receptacle area for receiving the heating element, a housing body, and at least one flexibility area situated between the housing body and the receptacle area. At least one force measuring element is installed in the glow plug housing.
Abstract:
The invention relates to a fuel injection device for an internal combustion engine having a housing, a first valve element, which has a first hydraulic control surface acting in the closing direction at least one second valve element, which has a second hydraulic control surface acting in the closing direction. Each valve element is associated with its own hydraulic control chamber, which can be connected to a shared high-pressure connection and is at least partially delimited by a respective hydraulic control surface. There is a fluid connection between the control chambers. The fuel injection device includes a valve device that can disconnect the fluid connection.
Abstract:
A fuel injection systems for direct-injection diesel engines, has a piezoelectric actuator contained in an injector body and acted on by a first spring mechanism so that it remains in contact with the injector body at one end and with a sleeve-like booster piston on the other. A nozzle body connected to the injector body has at least one nozzle outlet opening, and in which a stepped first nozzle needle an axially movable, and a second spring mechanism is contained inside the booster piston and the injection pressure hold the first nozzle needle closed. An outer control chamber communicates via at least one leakage gap with a fuel supply under injection pressure; fuel in the control chamber acts on the first nozzle needle in the opening direction. A large diameter rear region of the first nozzle needle is fitted into the internal chamber of the booster piston. A stepped concentric axial recess passing through the first nozzle needle and a second nozzle needle correspondingly stepped is fitted into the first nozzle needle, and a second inner chamber is hydraulically connected to the first outer control chamber. The control chamber volumes and the surfaces of the nozzle needles, matched so that the two nozzle needles open in succession in response to a change to the electrical voltage applied to the piezoelectric actuator.
Abstract:
A fuel injection apparatus has a high-pressure pump and a fuel-supply pump that delivers fuel from a fuel tank to the high-pressure pump. The high-pressure pump has a housing with an internal chamber that contains a drive unit for at least one pump element having a pump piston driven by the drive unit and delimiting a pump working chamber into which fuel is supplied via an inlet during an intake stroke and from which fuel is displaced via an outlet into the reservoir during a delivery stroke of the pump piston. The fuel-supply pump delivers fuel into the internal chamber via a connection that contains a check valve which opens toward the internal chamber of the housing and the inlet of the pump working chamber is connected to the internal 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.