摘要:
A control device for Diesel engines is proposed in which a rapid shutoff of the engine can be effected by evacuating the suction chamber of the injection pump. The control device includes a supply pump and a reversal valve, which in a stop position connects the suction chamber with the intake side of the supply pump and connects the compression side of the supply pump with the fuel tank. A check valve is provided in the supply line between the supply pump and the fuel filter which, when closed, is vacuum-tight; this check valve is disposed to open toward the filter, counter to the force of a valve closing spring. Another check valve, comprising an overflow valve determining the suction chamber pressure, is provided in an overflow line leading from the suction chamber to the fuel tank; this overflow valve is also vacuum-tight when closed. When the reversal valve is actuated by an electromagnet, a similar key-actuated shutoff to that known in gasoline engines can also be effected in Diesel engines. The circuitry of this embodiment also enables an involuntary "rolling start" to be blocked, and allows for a fail-safe shutoff of the engine in case of a malfunction in the governor shutoff device.
摘要:
A fuel injection valve for internal combustion engines that has a valve member which is guided axially displaceably in a guide bore of a valve body and which on an end toward the combustion chamber has a valve sealing face that cooperates with a valve seat face, formed on an end of the guide bore toward the combustion chamber, for controlling the communication between a high-pressure conduit in the valve body and at least one injection opening A diversion conduit in the valve member, by way of which diversion conduit the high-pressure conduit can be made to communicate with a relief chamber when the valve member has lifted from the valve seat face. Once the maximum opening stroke of the position of the valve member is reached, the diversion conduit is closed by a sealing face provided on the valve member, so that the entire supplied fuel quantity can attain injection.
摘要:
A fuel injection pump for internal combustion engines having a plurality of pump elements 2, 3 disposed in a line, the injection quantity control of which is effected via a control slide 9 that is axially displaceable on the pump piston 9 and by controlling a relief conduit 22-25 of the pump work chamber 18, the control slides 9 being surrounded by partial suction chambers 8 that discharge into a main suction chamber 10 receiving a torque shaft 12 for axially actuating the control slides 9. These partial suction chambers 8 each have a separate partial inflow conduit 39 of defined length and cross section, which communicates with an inflow conduit 33, so that the same volumetric flow is metered to each partial suction chamber in the manner of quantity division, while the main suction chamber 10 is retained and the torque shaft 12 is disposed in it.
摘要:
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.
摘要:
A fuel injector having a piezoelectric actuator. A needle valve is mounted in the injector body and has an opening hydraulic surface substantially surrounded by a high-pressure fuel line in fluid communication with a high-pressure fuel chamber. A control piston partly defines a piston control chamber, which is in fluid communication with the opening hydraulic surface and the high-pressure fuel chamber. The piezoelectric actuator is activated between an off position and an on position for positioning a control valve into an open position or a closed position. A high-pressure fuel condition is maintained in the piston control chamber by fuel supplied from the high-pressure fuel chamber and independent of any actuation of the control valve. In a low pressure fuel condition, a force on the opening hydraulic surface of the needle valve member is greater than the downward force on the closing hydraulic surface thereby opening the needle valve member for producing an injection event.
摘要:
A known control valve, especially for controlling a piston of a pressure intensifier of an injection device for internal combustion engines is already known per se. Said control valve comprises a control valve housing, fluid lines and a control valve piston which can be displaced in a controlled manner in the housing in at least two operational positions. Said piston controls at least the fluidic connection between a first chamber and a second chamber having a first flow rate or a reduced second flow rate. In order to produce said control valve which enables the precise control of the reduced second flow rate and which is simple to construct, a throttle is provided. Said throttle adjusts the reduced second flow rate and is arranged outside the control valve piston and in front of the second chamber.
摘要:
A pressure valve to be secured into a supply line between a pump work chamber of a fuel injection pump and a injection location of an internal combustion engine to be supplied with fuel. A pressure valve closing element provided with a sealing face is pressed by a compression spring onto a valve body provided with a valve seat. To reduce pressure waves in the supply line caused by a sudden closing of the pressure valve, a check valve that opens in the direction of the pump work chamber, and that comprises a valve seat, a valve closing element, a spring plate and a restoring spring is disposed in a through conduit of the pressure valve closing element, which is preceded by a throttle restriction. Throttling of the fuel flowing downstream of the check valve is avoided by disposing a through conduit in the spring plate. A filler piece inserted into the through conduit and defining the opening stroke of the check valve, also has a longitudinal bore that opens into a transverse bore for an unthrottled fuel flow.
摘要:
A fuel injection pump for internal combustion engines having a reciprocating pump piston and an annular slide displaceable on it, with a control bore that cooperates with a control recess on the pump piston, the recess communicates with a pump work chamber via a conduit. By means of location of control bores in the annular slide, the outflow stream is provided with the longest possible path until the outflow stream strikes the wall of the cylinder liner, in order to attain the freest and most unhindered possible stream course with reduced turbulence. Because the outflow stream strikes the hardened surface of the niche wall of the cylinder liner obliquely, cavitation damage is greatly attenuated or locally limited to sites of maximum resistance.
摘要:
A fuel injection nozzle for internal combustion engines having a nozzle body, firmly fastened to a nozzle holder with an interposition of a shim, and a valve needle that is axially displaceable in the nozzle body and that is lifted by the fuel pressure, counter to a closing spring assembly for the injection of fuel. To lend the injection nozzle a slender form, the chamber receiving the closing spring assembly is disposed eccentrically to the nozzle axle and the fuel inlet conduit in the nozzle holder, specifically in the portion of the nozzle holder wall that is thicker as a result of the eccentricity. In order, moreover to transmit the closing force of the closing spring assembly to the valve needle without shear forces as much as possible, a pressure protrusion that transmits the closing force is guided in an aperture extending eccentrically to the nozzle axle (b). The protrusion is integrally joined with an adapter or with the valve needle.
摘要:
Fuel injection pump for internal combustion engines with several pump elements located inline, wherein the commencement of injection of each of these pump elements takes place by a control spool axially displaceable on the pump piston and by control of relief ducts provided at the pump working spaces of the pump, the control spools are operated by a torque shaft which is formed in two parts, the first shaft part is axially secured, and the second shaft part is guided so as to be sealed in a bearing bush located in the pump casing. The two shaft parts are pushed one into the other by means of a trunnion and a blind hole which receives the trunnion. The shaft parts are rotationally connected to one another by means of a claw clutch.