Abstract: An improved fuel injection valve for a high-pressure injection of fuel from a central high-pressure line into combustion chambers of an internal combustion engine, which has an injection valve with a valve seat, a valve ball, and a guide piece that guides the valve ball. The guide piece presses the valve ball against the valve seat in order to close the injection control valve and during the opening, subjects the valve ball to an initial stress of a spring. During the opening, the valve ball is lifted up from the valve seat by means of a high-pressure jet which is supplied via an outlet throttle bore by a control chamber that is operatively connected with a central high-pressure line. A diffuser is disposed between the valve seat and the outlet throttle bore, and the outlet throttle bore, the diffuser, and the valve seat have the approximate shape of a steep-walled funnel with a right-angled to acute-angled cone angle.

Abstract: A fuel injection system for an internal combustion engine with at least one cylinder has an injection unit for each cylinder and a through flow limiting valve for each injection unit, which shuts off the supply of fuel to an injection nozzle contained in the injection unit when the fuel flowing out of the through flow limiting valve reaches a maximal fuel quantity. In order to reduce the maximal fuel quantity, the through flow limiting valve is disposed in a nozzle supply line whereby the injection nozzle communicates with a high-pressure fuel supply.

Abstract: The invention relates to an injection valve (10) for the fuel injection in a internal combustion engine, in particular in a diesel engine. The injection valve (10) has a holder body (20) in which a first passage (30) is formed. At the holder body (20) a nozzle body (40) of an injection nozzle (16) is secured in which a second passage (54) is formed which is connected to the first passage (30) and which together with the latter forms a fuel infeed line for the injection nozzle (16). Moreover, a closure mechanism (60) is provided for the closing off of the injection nozzle (16). A sleeve (74) serves for the sealing off of the connection point between the first and the second passage (30, 54).

Abstract: A fuel injection valve for high-pressure injection of fuel from a high-pressure reservoir into a combustion chamber of an internal combustion engine, especially a diesel engine, is described. The fuel injection valve has a magnet valve by means of which the fuel pressure can be either relieved (injection position) or built up (closing position) in a control chamber via a throttle having at least one throttle conduit segment defined by conduit walls. According to the invention, the throttle conduit segment is embodied substantially in the form of a variable aperture, or a variable throttle aperture.

Abstract: In a fuel infection valve, a valve chamber of a three ways valve is selectively communicated to drain and high pressure conduits and also communicated, via a main orifice, to a control chamber for controlling valve opening and closing operations of a nozzle needle. The control chamber may be communicated via the main orifice and the valve chamber to the drain conduit or the high pressure conduit, when a valve body is driven by a piezo actuator to open or close the drain conduit and close or open the high pressure conduit. The control chamber is always communicated via a sub orifice to the high pressure conduit without bypassing the three ways valve. Accordingly, hydraulic pressure in the control chamber is slowly decreased at a valve opening time and is rapidly increased at a valve closing time so that a lift characteristic of the nozzle needle is improved.

Abstract: The present invention provides a valve arrangement for metering fluid flow. The valve arrangement includes a valve seat including an orifice through which fluid flows. The valve arrangement also includes a valve displaceable along an axis between a first position contiguously engaging the valve seat and a second position spaced from the valve seat. Fluid flow between the valve seat and the valve is prevented in the first position and is permitted in the second position. The valve arrangement further includes a counterweight mounted on the valve for relative movement therebetween.

Abstract: A fuel supply apparatus restrains occurrence of resonance at a connecting portion of a distal end of a low-pressure fuel intake pipe to thereby reduce surges in fuel pressure and control generation of noises.

Abstract: A hydraulically actuated fuel injector has an electronically controlled actuator that moves an actuation valve member. The actuator can position the actuation valve member at one position to cause pressurization of fuel in a nozzle chamber for fuel injection, and at another position to hydraulically bias a check to halt fuel injection while maintaining full fuel pressure in the nozzle chamber indefinitely.

Abstract: A fuel delivery rail assembly for supplying fuel to a plurality of fuel injectors in an engine is provided. The assembly comprises an elongate conduit having a longitudinal fuel passage therein, a fuel inlet pipe, and a plurality of sockets. Outer walls of the conduit include at least one flat or arcuate flexible first absorbing surface, which is smoothly and integrally connected to an arcuate second absorbing surface. The first absorbing surface or the second absorbing surface faces fuel inlet ports of the sockets. The sectional configuration of the conduit can be flat, a telephone receiver shape, a character “T” shape, a corrugation shape, a dumbbell shape or a reverse eye mask shape. Thus, fuel pressure pulsations and shock waves are reduced by abrupt enlargements of fuel passages and bendings of the absorbing surfaces.

Abstract: The invention relates to an injector for injecting fuel that is at very high pressure, which is present at the injector in a common-rail inlet. The fuel acts on a control part, which is actuatable via a fuel volume contained in the control chamber. An inlet and an outlet of the control chamber are each provided with spring elements; the control chamber can be pressure-relieved via a valve element actuatable by means of an actuator. The control part in the injector housing is guided in two guide portions.

Abstract: A fuel injection system is provided for controlling fuel pressure in a common rail through the use of a piezoelectric actuated fuel injector. The fuel injection system includes at least one fuel injector having an axially extending fuel passage therein, a control chamber disposed in the injector, an injector valve axially movable within the fuel passage in accordance with a fuel pressure in the control chamber, and a piezoelectric actuator for actuating the control valve. The fuel injection system further includes a pressure sensor for determining a fuel pressure in the common rail, and a controller electrically connected to the pressure sensor and to the piezoelectric actuator of the fuel injector.

Abstract: An outwardly opening fuel injector comprises a valve needle movable within a bore provided in a nozzle body and engageable with a seating to control the supply of fuel from the bore. The valve needle is biased towards its seating and is moveable outwardly of the bore to move the valve needle away from its seating. The fuel injector comprises a sleeve member which is moveable with the valve needle, the valve needle and the sleeve member together defining a chamber for fuel such that, in use, fuel pressure within the chamber serves to dilate the sleeve member to reduce fuel leakage from the injector. A surface associated with the valve needle may be engageable with an additional seating defined by the bore to limit outward movement of the valve needle within the bore.

Abstract: A control valve for a fuel injection valve, having a valve needle, which is displaceable in a control chamber that is provided with an inlet, an outlet, a valve needle seat, and a throttle seat. Various switching states that make different courses of the opening procedure of the nozzle needle, switched by the control valve, of the fuel injection valve possible. To that end, it is provided that a throttle ring is disposed on the valve needle and is provided with throttle bores, which extend parallel to the longitudinal axis of the valve needle, and that the dimensions of the throttle ring and valve needle are selected such that an outlet conduit is formed between the outer wall of the valve needle and the inner wall of the throttle ring.

Abstract: A fuel injector comprising a valve needle slidable within a bore, a surface associated with the valve needle being exposed to the fuel pressure within a control chamber and an electromagnetically actuable control valve controlling communication between the control chamber and a low pressure chamber. The injector also comprises a damping arrangement arranged to damp pressure waves applied to the low pressure chamber.

Abstract: In a flow amount control device which control flow amount of fuel to be supplied to a high pressure fuel pump, an opening, which communicates with a port for passing fuel to the high pressure fuel pump, is composed of a first rectangular opening, a second rectangular opening whose circumferential length is larger than that of the first opening, and a third trapezoidal opening bridging between the first and second openings. The port communicates with the first opening, when engine speed is low, and, as the engine speed increases, with the third and second openings. Accordingly, the flow amount of fuel to be discharged from the high pressure fuel pump varies non-linearly and a change of the flow amount thereof is small in engine low speed region.

Abstract: A fuel injection valve for an internal combustion engines is proposed, in which the control of the fuel injection valve member is controlled through the control of the pressure of a control chamber (25). This chamber is either relieved by means of a control valve (31) or is subjected to a high pressure, which brings the fuel injection valve member into the closed position. At the same time as the relief of the control chamber, a valve member (33) of a safety valve (32) that controls the fuel supply to the fuel injection valve is opened so that upon opening of the fuel injection valve, high-pressure fuel simultaneously also can travel by way of a pressure line (12) from a high-pressure fuel reservoir (14) to the injection openings (8) of the fuel injection valve (1). After the end of the injection, the valve member (33) is closed again, together with the closing of the fuel injection valve member (5).

Abstract: The present invention relates to a pressure damper for a pressure vessel, in particular for a fuel distributor for an internal combustion engine, with a damper bellows that is connected to a sealing cap for closing an opening of the pressure vessel. In order to obtain a pressure damper that can be installed as easily as possible and can be manufactured as inexpensively as possible, the provision is made according to the invention that the sealing cap is embodied of one piece as a deep-draw part made of metal.

Abstract: A fuel rail assembly is disclosed. The fuel rail assembly includes a generally hollow fuel rail having a longitudinal rail axis extending therethrough and a fuel damper element having a wall and a longitudinal damper element axis extending therethrough. The fuel damper element is located within the fuel rail. The damper axis is generally parallel with the rail axis. A method of forming the fuel rail assembly is also disclosed.

Abstract: A directly actuated injection valve comprises a hollow valve housing, a valve needle disposed within the hollow interior, a needle spring and a tubular magnetostrictive actuator assembly disposed in an annular space around a portion of the valve needle. A magnetic field activates the magnetostrictive material to change its length to cause a corresponding movement of the valve needle that actuates the valve. The valve needle is formed from a ferromagnetic material and extends through the tubular magnetostrictive actuator assembly without interfering with the flux field that is directed through the magnetostrictive member. A passive hydraulic link assembly is preferably employed to compensate for component wear, temperature effects and manufacturing variations within design tolerances.

Abstract: A directly actuated injection valve comprises a hollow valve housing, a valve needle disposed within the hollow interior, a needle spring, and a magnetostrictive actuator assembly disposed in an annular space around a portion of the valve needle. A magnetic field actuates the magnetostrictive material to change its length to cause a corresponding movement of the valve needle that actuates the valve. The valve needle is comprises of a plurality of portions. The portion of the needle that extends through the magnetostrictive actuator assembly is formed from a non-ferromagnetic material and the portion of the needle comprising the needle tip, which contacts the valve seat, is formed from a different material that has higher through-hardness than that the non-ferromagnetic material. The portion of the needle formed from a non-ferromagnetic material prevents interference with the flux field that is directed through the magnetostrictive member.

Abstract: In a control device for a high pressure injection nozzle including a housing, an actuating magnet structure disposed in the housing and including a magnetic coil, an armature movable relative to the coil, and a valve actuating bolt engaged by the armature and being spring-biased to a seated position in which the injection nozzle is closed, the armature is movably mounted on the armature bolt and a mass body is resiliently supported adjacent the armature so that, upon de-energization of the magnet coil when the armature and the spring biased bolt are released and the bolt reaches the seated position, the armature is free to continue to move for engagement with the mass body to which the mass impulse forces of the armature are transferred, whereby the mass forces generated by the bolt when being seated are reduced and the movement of the armature is damped.

Abstract: An engine fuel injection system including a supply arrangement that includes a pair of conduits for supplying fuel to the plural injectors. The conduits are interrelated with the injectors in such a way that no one conduit supplies fuel to any two fuel injectors that fire simultaneously with or in sequence with each other.

Abstract: A fuel injection valve for internal combustion engines is supplied from a high-pressure fuel reservoir with high-pressure fuel that at the same time also serves to actuate the injection valve needle of the fuel injection valve. The injection valve needle is actuated via a tappet, which defines a control pressure chamber that is supplied with high-pressure fuel via a Z-throttle and can be relieved via an outlet throttle which is controlled by a magnet valve. The control pressure chamber is enclosed in an insert by the tappet guided in a cylindrical bore, and this insert receives not only the cylindrical bore but also a flat armature, a tappet of the flat armature, and a valve member of the magnet valve. The insert is braced on the housing on the injection valve by the magnet valve housing.

Abstract: A directly actuated injection valve comprises a hollow valve housing, a valve needle disposed within the hollow interior, a needle spring, an actuator assembly, and a hydraulic link assembly. The valve needle is movable between a closed position and an open position for governing the flow of fuel into the combustion chamber of an internal combustion engine. The displacement of the valve needle from the closed position is defined as the lift. The a needle spring biases the valve needle in the closed position. The actuator assembly generates an opening force that acts against the needle spring to open the valve. The hydraulic link assembly is interposed between the valve needle and the needle spring and the actuator assembly. The hydraulic link assembly transmits respective closing and opening forces to the valve needle. The hydraulic link preferably comprises a piston disposed within a cylinder that is filled with a hydraulic fluid.

Abstract: A fuel injector including a floating sleeve control chamber is provided which effectively minimizes friction and wear, and thus prevents stiction, of a nozzle valve element by avoiding the need to align two bore guiding surfaces for the element. The floating sleeve control chamber includes a floating sleeve positioned on a control piston formed integrally with a nozzle valve element and positioned in a cavity. The floating sleeve is sized with an outer extent or diameter sufficiently less than the size of a surrounding cavity wall so as to permit lateral movement of the floating sleeve and thus movement of the control chamber. Only the nozzle valve element guiding bore surfaces control the alignment of the nozzle valve element relative to its seat while the floating sleeve effectively forms and seals a floating control chamber. The floating sleeve may be formed from one or more sleeve sections.

Abstract: The present invention relates to a fuel injection device for combustion engines, preferably Diesel engines, with at least one pilot valve by means of which a control piston is displaceable by a pressure medium in order to convey fuel through at least one line/channel toward a combustion chamber of the internal combustion engine, whereby at least one accumulator is provided in the flow path of the fuel or the pressure medium, and an accumulator space is connected to the connecting line/channel for the fuel or the pressure medium.

Abstract: A pressure valve for installation in a feed line between a fuel injection pump and an injection site of an internal combustion engine to be supplied. The valve has at least one movable valve member, embodied as a valve ball, which can be brought by a restoring spring into contact with a valve seat A spring plate is provided between the restoring spring and the valve ball and has a spherical surface for guiding the valve ball, and a bearing face, remote from this spherical guide face, for the restoring spring. This spherical surface that guides the valve ball is intended to be interrupted at the spring plate.

Abstract: A fuel injection valve for internal combustion engines, having a valve member that is axially displaceable in a valve body and that with a sealing face cooperates, to control an injection opening, with a valve seat face on the valve body. An end of the valve member remote from the combustion chamber is urged in the closing direction by a valve spring disposed in a spring chamber. The valve member has a pressure shoulder acting in the opening direction, which protrudes into a pressure chamber that is filled with high fuel pressure. Via a throttle gap, the spring chamber communicates with the pressure chamber and is sealed off from a fuel return system, so that during the opening stroke motion of the valve member the spring chamber acts as a hydraulic damper.

Abstract: An injector is provided which includes a nozzle valve element, a control volume, and an injection control valve for controlling fuel flow from the control volume so as to control nozzle valve movement. Importantly, the injector includes a nozzle valve lift detecting device for detecting nozzle valve lift and providing a nozzle valve element lift feedback signal. In addition, an injection control valve member movement detecting device may be provided for detecting movement of the injection control valve member into open and/or closed positions and generating a control valve member position feedback signal. One or both of the feedback signals may be used for adjusting the timing and/or rate of opening of the injection control valve thereby controlling the timing and/or rate of opening of the nozzle valve element to control the timing and/or rate of fuel injection of subsequent injection events.

Abstract: An injection valve arrangement which is to be connected with a common rail of a fuel feeding system of a combustion engine comprises a valve body. A first valve needle and a first piston arrangement functionally coupled thereto and a second valve needle and a second piston arrangement functionally coupled thereto are inside the valve body. The needle valves are arranged operationally in series so that the first needle valve is connected to feed pressure of the common rail and is arranged to open always first. The second needle valve controls the injection of the fuel into a cylinder of the engine.

Abstract: The present invention relates to an improved fuel injector rocker lever designed to maintain relatively high fuel injection pressures when the engine speed decreases from full-rated power to torque peak conditions. The fuel injector rocker lever is designed with a size and shape so as to make the rocker lever flexible, thereby allowing the rocker lever to store and release strain energy when actuating the fuel injector. Thus, as engine speed decreases, the fuel injection pressure decreases at a lower rate when compared to a stiff actuating train because the fuel injector train is storing more strain energy due to its flexible nature. Generally, the improved rocker lever is designed with a vertically thin and horizontally wide arm which increases its width from the fuel injector actuator to the pivot point of the rocker lever. By reducing the thickness of the rocker lever, the stiffness decreases significantly, thereby permitting more strain energy to be stored and released by the rocker lever.

Abstract: A common rail injector having an injector housing that can be made to communicate via a high-pressure connection with a high-pressure reservoir. A nozzle needle is axially displaceable against a nozzle needle seat in order to adjust the injection onset and the injection quantity in a common rail injection system of an internal combustion engine as a function of the position of a magnet-controlled control piston that is prestressed counter to a spring. To make it possible that during operation to characterize the opening and closing operation of the nozzle needle, the nozzle needle is coupled via an intermediate piece to a servo piston that cooperates with the control piston.

Abstract: A valve control unit for a fuel injection valve includes a housing body with two valve control chambers that continuously communicate with each other. An end member of a movable valve control piston can be moved inside the first valve control chamber and the first valve control chamber communicates with an inlet conduit for fuel. The second valve control chamber communicates with an outlet conduit that can be closed by a ball valve. The end member is comprised of an inner structural member and an outer structural member that can move in relation to each other. In the movement of the valve control piston, only the outer structural member is moved for a preinjection of fuel and the inner structural member is moved for the main injection. The quantity of preinjected fuel can be further minimized while an increased movement speed of the valve control piston is simultaneously possible during the main injection.

Abstract: A fuel injection diesel internal-combustion engine, having a fuel injection nozzle and having a spring chamber for the pressure spring acting upon the nozzle needle. The spring chamber is constructed as a closed chamber without a leak oil connection and forms a space which is under a fuel pressure. The spring chamber fills with fuel, by way of a slide guide for the pressure linkage of the nozzle needle constructed as a throttling point. As the fuel pressure in the spring chamber rises above an operating pressure corresponding to the control position of the injection pump for the defined driving condition, the delivery time of the pump is prolonged for compensating the lowering of the injection quantity connected with the pressure rise in the spring chamber.

Abstract: Pressurized fuel of a common rail is introduced into a control chamber of a fuel injector. An electromagnetic valve opens or closes a fuel discharge passage of the control chamber to adjust a hydraulic pressure of the control chamber. Through a switching leak passage, bubble-containing fuel directly returns from a valve opening of the electromagnetic valve to a low-pressure return passage without passing through an armature chamber. Through a stationary leak passage, the fuel leaking from every slide portion returns to the return passage via the armature chamber. A downstream portion of the stationary leak passage opens to the upper portion of the armature chamber. A damper element is provided downstream of the electromagnetic valve in the return passage for canceling an increased fuel pressure.

Abstract: A common rail delivers fuel to a fuel injection valve for injecting fuel directly into each combustion chamber of a direct injection type gasoline engine. A connected accumulator incorporates a gas-sealed type damper. A body portion of the damper can stretch and shrink by being constructed of a metallic bellows, and gas is sealed in the metallic bellows. The pressure at which the gas is initially sealed within the damper is set for 4 Mpa or more, more preferably, for 8 Mpa or more. Further, to secure suppression of a variation in normal operation fuel pressure (for example, 10-12 Mpa), the pressure at which the gas is initially sealed within the damper is set to be lower than the normal operation fuel pressure, more preferably, lower than the normal operation fuel pressure by 1 Mpa or more.

Abstract: A fuel system damper is provided having a housing which is separated by a diaphragm into first and second chambers. The first chamber is sealed and contains a spring biased toward the diaphragm. The second chamber has an opening to allow fuel from a fuel rail to enter the damper and contact the diaphragm. The second chamber includes a radial shoulder that maximizes an effective area of the diaphragm. A spacer is disposed in the second chamber that engages the diaphragm to prevent the diaphragm from contacting the radial shoulder. The spacer maintains the diaphragm in a position to provide the maximum effective area of the diaphragm.

Abstract: A high-pressure fuel supply assembly includes a high-pressure fuel pump for pressurizing fuel from a low-pressure fuel intake passage and discharging high-pressure fuel into a high-pressure fuel discharge passage, a high-pressure damper disposed in the high-pressure fuel discharge passage for absorbing surges in the high-pressure fuel, a high-pressure regulator disposed in a branch passage branching from a branch portion of the high-pressure fuel discharge passage for adjusting the high-pressure fuel from the high-pressure damper to a predetermined pressure, and an orifice disposed in the high-pressure fuel discharge passage downstream from the branch portion for absorbing surges in the high-pressure fuel.

Abstract: An improved fuel supply system for a direct injected engine accommodated in outboard motors includes a pump drive mechanism, instead of a camshaft, for driving a high pressure fuel pump. A pair of the high pressure fuel pumps is applied in one embodiment and a single one is applied in another embodiment. A pulsation damper is further provided for smoothing output of the fuel pump. The pump drive mechanism is unified with a fuel supply conduit, which has a plurality of fuel injectors, for increasing rigidity of components and affixed to the cylinder body of the engine. Openings on the cylinder head of the engine for accommodating the fuel injectors are larger than the injectors so that accumulated tolerances are absorbed by the gap made between the opening and the injector.

Abstract: A fuel injection device is composed of a valve member to open and close an injection hole, a high pressure passage for generating a basic pressure force to urge the valve member in a direction of opening the injection hole, an electromagnetic valve, first and second springs for generating biasing forces to urge the valve member in a direction of closing the injection hole, and first and second control chambers disposed in the fuel passages. The respective control chambers are communicated with the high pressure passage when the electromagnetic valve is not actuated and respective fuel pressure in the first and second control chambers urge the valve member in a direction of closing the injection hole, and the respective control chambers are communicated one after another at different timings to a low pressure conduit to reduce fuel pressure therein when the electromagnetic valve is actuated.

Abstract: A control and safety valve arrangement in a fuel feeding system of an internal combustion engine, especially a large diesel engine, in which fuel is pumped from a fuel tank at least to one common pressure accumulator unit (1) and is fed therefrom under high pressure to be injected at least into two cylinders of the engine. The pressure accumulator unit (1,1a) is connect to the fuel tank with a separate return flow line (5,6,7), which is provided with valve means provided with two separate control arrangements operationally independent on each other so that the pressure accumulator unit (1) can be connected to the fuel tank by means of a first control arrangement under the influence of a separate control pressure when necessary and in addition by means of a second control arrangement in case the pressure in the pressure accumulator unit (1) exceeds a certain selected limit value.

Abstract: A fuel supply system for a direct injection gasoline engine can be used in a variable fuel pressure system without using a large pulsation absorber and, as a result, is inexpensive and can be easily reduced in size. The fuel supply system for a direct injection gasoline engine includes a single-cylinder high-pressure pump, a resonator for suppressing the pressure pulsation of high-pressure fuel supplied from the high-pressure fuel pump, and a high-pressure variable regulator for variably changing the pressure of the high-pressure fuel. The fuel-supply system directly injects the high-pressure fuel into the cylinders of the engine through injectors.

Abstract: A fuel-injection apparatus is disclosed, in which a valve stem and a valve body for an actuator-operated valve are formed separately from each other whereby the valve body may be made less in its pressure-exposed area, resulting in reducing the force for opening the valve upon valve-opening phase. The valve stem and the valve body, formed separately, may be made less in their diameter whereby less fuel pressure acting on the valve may be sufficient. This makes it possible to reduce the force for opening the valve upon valve-opening phase. The valve stem and the valve body are united into the valve by the application of a reinforcing plate onto the bottom ends of them. The valve body is provided on a valve face thereof with an annular groove concentric with a central hole, and radial grooves extending radially outwardly from the annular groove.

Abstract: In a fuel injection system for a multi-cylinder internal combustion engine with a cam-controlled high-pressure injection pump for transporting the fuel to a common fuel line (common rail), which acts as high-pressure storage and from which injection lines lead to injection nozzles and which possesses a solenoid valve control that determines the start of the feeding of the fuel, in every exposed fuel line which is an injection line between the common fuel line and an injection nozzle, a solenoid valve which controls the starting point for feeding fuel to the engine is arranged in close proximity to the common fuel line.

Abstract: A fuel rail assembly comprising a fuel rail and a damper assembly in the fuel rail. The damper assembly includes a damper having an end and an inner surface defining a cavity, and a sealing member at least partially received in the end and bonded to the inner surface to substantially seal the cavity. The sealing member is preferably a metal wire that includes a sealing portion bonded to the inner surface to substantially seal the cavity. The bond is preferably formed by induction brazing, and the sealing member is coated with copper to facilitate the brazing. The invention also provides a fuel rail assembly comprising a fuel rail having a longitudinal axis and an inner wall. A damper assembly in the fuel rail includes a damper, and a spring locator coupled with the damper, the spring locator having two positioning portions outwardly biased to engage the inner wall of the fuel rail and position the damper assembly axially in the fuel rail. The spring locator is preferably a metal wire.

Abstract: A pressure control valve for installation in a supply line between a pump work chamber of a fuel injection pump and an injection point in the engine to be supplied. A valve body that has a first valve seat and an axial through conduit in which a pressure control valve closing member is guided. The pressure control valve closing member opens toward the injection point counter to the force of a first valve spring and has a sealing face that cooperates with the first valve seat, as well as with an axial through bore in the pressure control valve closing member. The bore can be closed by a back-flow valve that opens in the direction of the pump work chamber and has a second valve spring. For an optimal, unthrottled fuel flow through the pressure control valve, fuel conduits are respectively formed between the radially outer circumference faces of the first and second valve springs and the housing walls that encompass them, through which conduit the fuel flows in an unthrottled fashion.

Abstract: A method of injecting fuel in multicylinder engines. A fuel pre-pressure is generated to be converted within acceleration pipes by opening controlled shutoff valves and recirculating fuel to a fuel pump inlet. The fuel under pre-pressure is conveyed via a fuel pump into a pre-pressure common rail common to several engine cylinders. This pre-pressure is only a fraction of the required injection pressure. When the pre-pressure is exceeded, fuel is fed from the pre-pressure common rail, via pressure-limiting valves, into a return common rail common to several engine cylinders. The shutting off of the shutoff valves provokes a steep rise of fuel pressure, due to a water hammer effect. This produces a high-pressure wave since the closed shutoff valve supplies high pressure for fuel injection through the respective injection nozzle associated with the shutoff valve. One acceleration pipe is used for every shutoff valve between the pre-pressure common rail and the return common rail.

Abstract: The invention concerns a device for injecting fuel into a diesel engine using a pulsating flow pump for improving the fuel performance of the engines by controlling the beginning and the end of the injection. It comprises a device (20) controlling the closing and opening of the nozzle needle (5) provided with a discharge circuit (21, 21′) controlled by an electrovalve (25) in branched connection between the high pressure supply conduit (7) and the low pressure return conduit (8). The discharge circuit (21, 21′) comprises a discharge valve (22) whereof the opening and the closing are slowed down by a calibrated orifice (23). The discharge valve (22) located upstream of a discharge orifice (27) provided on the return conduit (8) enables to deviate part of the non-injected fuel flow towards the nozzle needle (5) to exert thereon a closing pressure. Consequently, this results in a better control over the opening and closing of the nozzle needle (5).

Abstract: The present invention provides a damper for a fuel system. The damper includes a first chamber with an interior surface, and a second chamber with a fuel receiving opening. A diaphragm separates the first chamber and the second chamber. A device is disposed within the first chamber that biases the diaphragm toward the fuel receiving opening. A retainer, which supports the device proximate the diaphragm, is located in the first chamber. The retainer has a surface exposed to the interior surface of the first chamber. A lubricant is disposed on at least one of the interior surface of the first chamber and the surface of the retainer.

Abstract: This accumulating fuel injection apparatus is provided with a needle valve 6 adapted to open and close an injection nozzle 11 having injection ports 14 in a lower end portion thereof, a balancing chamber 5 formed in a casing 2 so as to apply a fuel pressure to a head portion of the needle valve 6, a supply passage including a slit 10 and used for supplying a fuel from a fuel supply port 19 to the balancing chamber 5, a discharge passage 20 comprising an orifice for discharging the fuel from the balancing chamber 5, and a solenoid valve 22 adapted to open and close the discharge passage 20, the lift of a valve disc 26 of the solenoid valve 22 is controlled by a lift control means comprising a stopper 28 the position of which is controlled by a lift control mechanism 23.