EP2662557B1 - Closure bolts with a flow limiting valve for an injector - Google Patents
Closure bolts with a flow limiting valve for an injector Download PDFInfo
- Publication number
- EP2662557B1 EP2662557B1 EP13164996.4A EP13164996A EP2662557B1 EP 2662557 B1 EP2662557 B1 EP 2662557B1 EP 13164996 A EP13164996 A EP 13164996A EP 2662557 B1 EP2662557 B1 EP 2662557B1
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- EP
- European Patent Office
- Prior art keywords
- pressure
- injector
- insert
- bolt
- closure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/165—Filtering elements specially adapted in fuel inlets to injector
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0054—Check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for
Definitions
- the invention relates to a closure pin for an injector of a modular common rail fuel injection system.
- Modular common rail systems are characterized by the fact that part of the storage volume present in the system is present in the injector itself.
- Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other.
- the sole use of a common rail for all injectors is not useful in such engines, as it would come to a massive slump in injection pressure due to the long lines during injection, so with prolonged injection duration, the injection rate would noticeably break.
- it is therefore intended to arrange a high-pressure accumulator inside each injector.
- Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module.
- a high-pressure accumulator Under a high-pressure accumulator this is not a common line to understand, but it is a pressure-resistant vessel with an inlet and outlet, whose diameter is significantly increased compared to the high pressure lines, so that from the high-pressure accumulator a certain amount of injection can be delivered without causing an immediate pressure drop.
- High pressure fuel from a high pressure pump is supplied, the supply is usually via an opening of the injector at the top of the high pressure accumulator (so-called Top feed).
- the connection of the high-pressure fuel leading high-pressure line to the injector takes place via a provided with a high-pressure port closure pin, which can be inserted into the opening of the injector section having a preferably conical sealing surface for high pressure-tight sealing of the opening. This seals the volume of the high-pressure accumulator.
- the closure bolt usually has the further function of passing the fuel for the adjacent injectors, for which purpose a second high-pressure port is provided.
- a flow limiter is integrated in the locking pin, which separates the injector from the high-pressure fuel flow when the flow rate is too high.
- the closure pin in the embodiment according to the prior art has a high-pressure bore continuous in the axial direction into which the high-pressure connection opens radially and via which the high-pressure fuel is conducted into the high-pressure accumulator.
- the axial high-pressure bore is sealed by means of a screw plug.
- a disadvantage of the described design of the locking bolt is that its inner contour geometrie employment is acted upon over the entire length of the full pressure of the high-pressure fuel, so that in terms of geometric design and the roughness high quality is required, which is difficult to achieve in the production.
- the difficult to manufacture geometries for the flow restrictor are a problem. This means that a durable design at system pressures of over 1600 bar is no longer possible.
- EP1653076B describes another flow restrictor integrated in a closure pin.
- the present invention therefore aims to avoid the disadvantages described above. Furthermore, the invention has the object to provide a construction which is easier to manufacture and with which it is possible to adapt the closing amount of the flow restrictor in a simple manner to the respective needs.
- the closure bolt of the type mentioned comprising at least one high-pressure connection for high-pressure fuel, a bolt-like, insertable into an opening of the injector portion with a first, preferably tapered sealing surface for high-pressure sealing the opening, wherein the bolt-like portion with the high pressure port in hydraulic connection, opening into the injector high-pressure bore, and a flow restrictor for limiting the amount of fuel delivered to the injector, according to the invention essentially designed such that the bolt-like portion has an insert in which the flow restrictor is formed and which carries the first sealing surface ,
- the bolt-like portion of the locking bolt is thus formed at least in two parts, wherein the insert faces the high pressure accumulator and ensures the sealing of the high pressure accumulator with the first sealing surface.
- the flow restrictor is now arranged in this insert, the difficult to manufacture geometries of the flow restrictor are limited to the use, so that the main body of the locking bolt is much easier to manufacture.
- the high pressure applied geometries of the body can be performed without manufacturing difficulties with the appropriate radii and surfaces.
- the two-part design means that the high-pressure bore of the locking bolt no longer has to extend through the entire locking pin, so that the use of a locking screw can be dispensed with, whereby the risk of manipulation by unauthorized persons is reduced.
- the insert can be exchanged in a simple manner with a constant basic body, so that a simple adaptation of the closing amount of the flow restrictor succeeds by providing a plurality of inserts with a different design of the flow restrictor.
- the insert does not have to have its own connection means to be connected to the base body. Rather, a preferred embodiment provides that the screwing of the base body with the injector body simultaneously provides the required holding force for use.
- the formation is preferably made for this purpose such that the insert has a shoulder with a second, preferably conical sealing surface, which cooperates with a counter surface of the bolt-like portion.
- the screwing of the locking bolt then brings the required sealing force on both sealing surfaces at the same time, namely on the first, between the injector body and the insert reaching the effective sealing surface and on the second, between the insert and the main body of the locking bolt or the bolt-like portion to effect reaching sealing surface.
- the first and / or the second sealing surface is conical or conical.
- the flow restrictor may particularly preferably be arranged at least partially, as a result of which high fatigue strength can be achieved.
- the axial portion of the insert is received in the receiving bore, that it can be acted upon from the outside and from the inside with the pressure of the high-pressure fuel.
- a pressure balanced area is created, which is subjected to pressure oscillations to a much lesser extent.
- the pressure surges acting on the flow restrictor are minimized.
- the difficult to manufacture flow restrictor geometries can be readily implemented without compromising fatigue strength.
- the insert is designed so that a gap remains between its end face and the bottom of the receiving bore, so that the insert in the pressure-compensated region can be acted upon from the outside by high-pressure fuel.
- a preferred development further provides that the receiving bore at the transition into the high pressure bore has an annular bearing surface for the closing member, in particular the ball of the flow restrictor.
- the high-pressure bore via a throttle formed in the insert opens into the injector.
- a rod filter is preferably arranged which retains coarse particles from the fuel.
- Fig. 1 an embodiment of the locking bolt according to the prior art
- Fig. 2 an embodiment according to the present invention.
- FIG. 1 an end portion of an injector body 1 is shown, in which a high-pressure accumulator 2 is integrated.
- the high-pressure accumulator 2 accommodating part is sometimes referred to as a holding body.
- the injector or holding body 1 has a leading to the high-pressure accumulator 2 opening 3, in which a bolt-like portion 4 of a locking pin 5 is inserted.
- the bolt-like portion 4 has at the high-pressure accumulator 2 facing end face on a conical sealing surface 6, which cooperates with a corresponding counter-surface at the edge of the opening 3.
- the required holding force is applied by means of a clamping nut 7, which cooperates with its internal thread with axially adjoining external threads of the injector body 2 and the locking pin 5.
- a gap 10 is provided between the shoulder 8 of the locking pin 5 and the annular end face 9 of the injector body 1, in order to avoid a double fit.
- a closure bolt 5 axially passing through the high-pressure bore 11 is provided, which is closed on one side by means of a screw plug 12 and is on the other side via a throttle 13 with the high-pressure accumulator 2 in combination.
- the closure screw 11 has a central extension 14, which supports a ball 15 of the flow restrictor 16.
- the ball 15 is acted upon by means of a coil spring 17 in the direction of the extension 14.
- the valve seat of the flow restrictor 16 is designated by 18.
- the function of the flow restrictor 16 is as follows: With common rail systems, under unfavorable circumstances leaks may occur, be it in the piping system or due to defective injectors. Injectors with clamping nozzle needles, which lead to continuous injections into the combustion chamber, can cause significant damage.
- Flow rate limiters with closing function serve to avoid these dangers, which close the inlet to the affected injector when a maximum withdrawal quantity is exceeded from the high-pressure accumulator and thus decouple the injection-pump-side high-pressure from the injection-valve side.
- the ball 15 is pressed in the bore 11 to a stop (extension 14) and moves through the resulting during injection flow due to the pressure difference at ball flow in the direction of the sealing seat 18.
- a stop extension 14
- the ball 15 goes into the seat 18 and prevents further flow into the injector, whereby a continuous injection is prevented.
- a rod filter 19 is further arranged in the high-pressure bore 11.
- a rod filter 19 is further arranged in the high-pressure bore 11 opens a radial line, which is equipped with a high pressure port 20.
- a line not shown is connected, via which the supply of high-pressure fuel from a high-pressure pump, not shown, takes place.
- the closure pin 5 has a further high-pressure port 21, via which a connection to a subsequent injector can be made.
- the high-pressure bore 11 is subjected to the pressure of the high-pressure fuel, which leads to an impermissible dynamic load at system pressures of more than 1600 bar in the region of the radii and the like required for the formation of the flow restrictor.
- the bolt-like portion 4 of the locking bolt 5 has a receiving bore 22 into which an axial portion 23 of an insert 24 is received.
- the insert 24 accommodates in the high pressure bore 11 the flow restrictor 16, the rod filter 19 and the throttle 13.
- the insert 24 has a shoulder 25 on which a conical sealing surface 26 is formed, which cooperates with a conical counter surface of the bolt-like portion 4. This causes the bolting of the locking bolt 5 simultaneously generates a sealing force on the sealing surface 6 and on the sealing surface 26 by means of the clamping nut 7.
- the end face of the axial portion 23 terminates at a distance from the provided at the transition of the receiving bore 22 in the high-pressure bore 11 annular bearing surface 28. Further, the recorded in the receiving bore 22 axial portion 23 is formed in its front portion 27 with a reduced outer diameter, so that in the Resulting annular gap between the outer periphery of the front portion 27 of the axial portion 23 and the receiving bore 22, the pressure of the high-pressure fuel from the outside on the flow restrictor 16 can be effective. This results in a pressure compensated region of the flow restrictor 16, so that the vibration load is reduced.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung betrifft einen Verschlussbolzen für einen Injektor eines modularen Common-Rail-Kraftstoffeinspritzsystems.The invention relates to a closure pin for an injector of a modular common rail fuel injection system.
Modulare Common-Rail-Systeme zeichnen sich dadurch aus, dass ein Teil des im System vorhandenen Speichervolumens im Injektor selbst vorhanden ist. Modulare Common-Rail-Systeme kommen bei besonders großen Motoren zum Einsatz, bei welchen die einzelnen Injektoren unter Umständen in erheblichem Abstand voneinander angebracht sind. Die alleinige Verwendung eines gemeinsamen Rails für alle Injektoren ist bei solchen Motoren nicht sinnvoll, da es aufgrund der langen Leitungen während der Einspritzung zu einem massiven Einbruch im Einspritzdruck kommen würde, sodass bei längerer Spritzdauer die Einspritzrate merklich einbrechen würde. Bei solchen Motoren ist es daher vorgesehen, einen Hochdruckspeicher im Inneren eines jeden Injektors anzuordnen. Eine solche Bauweise wird als modularer Aufbau bezeichnet, da jeder einzelne Injektor über seinen eigenen Hochdruckspeicher verfügt und somit als eigenständiges Modul eingesetzt werden kann. Unter einem Hochdruckspeicher ist hierbei nicht eine gewöhnliche Leitung zu verstehen, sondern es handelt sich um ein druckfestes Gefäß mit einer Zu- bzw. Ableitung, dessen Durchmesser im Vergleich zu den Hochdruckleitungen deutlich vergrößert ist, damit aus dem Hochdruckspeicher eine gewisse Einspritzmenge abgegeben werden kann, ohne dass es zu einem sofortigen Druckabfall kommt.Modular common rail systems are characterized by the fact that part of the storage volume present in the system is present in the injector itself. Modular common-rail systems are used in particularly large engines, in which the individual injectors may be mounted at a considerable distance from each other. The sole use of a common rail for all injectors is not useful in such engines, as it would come to a massive slump in injection pressure due to the long lines during injection, so with prolonged injection duration, the injection rate would noticeably break. In such engines, it is therefore intended to arrange a high-pressure accumulator inside each injector. Such a design is referred to as a modular structure, since each injector has its own high-pressure accumulator and thus can be used as a stand-alone module. Under a high-pressure accumulator this is not a common line to understand, but it is a pressure-resistant vessel with an inlet and outlet, whose diameter is significantly increased compared to the high pressure lines, so that from the high-pressure accumulator a certain amount of injection can be delivered without causing an immediate pressure drop.
Injektoren von modularen Common-Rail-Systemen wird Hochdruckkraftstoff aus einer Hochdruckpumpe zugeführt, wobei die Zuführung meist über eine Öffnung des Injektors an der Oberseite des Hochdruckspeichers (sogenannter Top feed) erfolgt. Der Anschluss der den Hochdruckkraftstoff führenden Hochdruckleitung an den Injektor erfolgt dabei über einen mit einem Hochdruckanschluss versehenen Verschlussbolzen, der einen in die Öffnung des Injektors einführbaren Abschnitt mit einer vorzugsweise kegeligen Dichtfläche zum hochdruckdichten Verschließen der Öffnung aufweist. Dadurch wird das Volumen des integrierten Hochdruckspeichers abgedichtet. Der Verschlussbolzen hat in der Regel weiters die Funktion, den Kraftstoff für die benachbarten Injektoren durchzuleiten, zu welchem Zweck ein zweiter Hochdruckanschluss vorgesehen ist.Injectors of modular common rail systems, high pressure fuel from a high pressure pump is supplied, the supply is usually via an opening of the injector at the top of the high pressure accumulator (so-called Top feed). The connection of the high-pressure fuel leading high-pressure line to the injector takes place via a provided with a high-pressure port closure pin, which can be inserted into the opening of the injector section having a preferably conical sealing surface for high pressure-tight sealing of the opening. This seals the volume of the high-pressure accumulator. The closure bolt usually has the further function of passing the fuel for the adjacent injectors, for which purpose a second high-pressure port is provided.
In den Verschlussbolzen ist ein Durchflussbegrenzer integriert, der den Injektor bei zu hoher Durchflussmenge vom Hochdruckkraftstoffzufluss trennt.A flow limiter is integrated in the locking pin, which separates the injector from the high-pressure fuel flow when the flow rate is too high.
Aus fertigungstechnischen Gründen weist der Verschlussbolzen bei der Ausführung gemäß dem Stand der Technik eine in axialer Richtung durchgehende Hochdruckbohrung auf, in welche der Hochdruckanschluss radial einmündet und über welchen der Hochdruckkraftstoff in den Hochdruckspeicher geleitet wird. Nach außen ist die axiale Hochdruckbohrung mittels einer Verschlussschraube abgedichtet.For manufacturing reasons, the closure pin in the embodiment according to the prior art has a high-pressure bore continuous in the axial direction into which the high-pressure connection opens radially and via which the high-pressure fuel is conducted into the high-pressure accumulator. To the outside, the axial high-pressure bore is sealed by means of a screw plug.
Nachteilig bei der beschriebenen Ausbildung des Verschlussbolzens ist, dass dessen Innenkontur geometriebedingt über die ganze Länge mit dem vollen Druck des Hochdruckkraftstoffes beaufschlagt ist, sodass hinsichtlich der geometrischen Ausbildung und der Rautiefen eine hohe Qualität erforderlich ist, die in der Herstellung jedoch schwierig zu erzielen ist. Insbesondere die schwierig herzustellenden Geometrien für den Durchflussbegrenzer stellen ein Problem dar. Dies führt dazu, dass eine dauerfeste Auslegung bei Systemdrücken von über 1600 bar nicht mehr möglich ist.
Die vorliegende Erfindung zielt daher darauf ab, die oben beschriebenen Nachteile zu vermeiden. Weiters stellt sich die Erfindung die Aufgabe, eine Konstruktion zu schaffen, die einfacher herzustellen ist und mit der es gelingt, die Schließmenge des Durchflussbegrenzers in einfacher Weise an die jeweiligen Bedürfnisse anzupassen.The present invention therefore aims to avoid the disadvantages described above. Furthermore, the invention has the object to provide a construction which is easier to manufacture and with which it is possible to adapt the closing amount of the flow restrictor in a simple manner to the respective needs.
Zur Lösung dieser Aufgabe ist der Verschlussbolzen der eingangs genannten Art, umfassend wenigstens einen Hochdruckanschluss für Hochdruckkraftstoff, einen bolzenartigen, in eine Öffnung des Injektors einführbaren Abschnitt mit einer ersten, vorzugsweise kegeligen Dichtfläche zum hochdruckdichten Verschließen der Öffnung, wobei der bolzenartige Abschnitt eine mit dem Hochdruckanschluss in hydraulischer Verbindung stehende, in den Injektor mündende Hochdruckbohrung aufweist, und einen Durchflussbegrenzer zum Begrenzen der in den Injektor geförderten Kraftstoffmenge, erfindungsgemäß im Wesentlichen derart ausgebildet, dass der bolzenartige Abschnitt einen Einsatz aufweist, in dem der Durchflussbegrenzer ausgebildet ist und der die erste Dichtfläche trägt. Der bolzenartige Abschnitt des Verschlussbolzens ist somit zumindest zweiteilig ausgebildet, wobei der Einsatz dem Hochdruckspeicher zugewandt ist und mit der ersten Dichtfläche die Abdichtung des Hochdruckspeichers sicherstellt. Dadurch, dass der Durchflussbegrenzer nun in diesem Einsatz angeordnet ist, sind die schwierig herzustellenden Geometrien des Durchflussbegrenzers auf den Einsatz beschränkt, sodass der Grundkörper des Verschlussbolzens wesentlich einfacher herzustellen ist. Insbesondere können die mit Hochdruck beaufschlagten Geometrien des Grundkörpers ohne fertigungstechnische Schwierigkeiten mit den geeigneten Radien und Oberflächen ausgeführt werden. Weiters führt die zweiteilige Ausführung dazu, dass sich die Hochdruckbohrung des Verschlussbolzens nicht mehr durch den gesamten Verschlussbolzen erstrecken muss, sodass auf den Einsatz einer Verschlussschraube verzichtet werden kann, wodurch die Gefahr eines Manipulierens durch unautorisierte Personen verringert wird. Ein weiterer Vorteil liegt darin, dass der Einsatz bei gleichbleibendem Grundkörper in einfacher Weise getauscht werden kann, sodass durch Bereitstellung einer Mehrzahl von Einsätzen mit unterschiedlicher Auslegung des Durchflussbegrenzers eine einfache Anpassung der Schließmenge des Durchflussbegrenzers gelingt.To achieve this object, the closure bolt of the type mentioned, comprising at least one high-pressure connection for high-pressure fuel, a bolt-like, insertable into an opening of the injector portion with a first, preferably tapered sealing surface for high-pressure sealing the opening, wherein the bolt-like portion with the high pressure port in hydraulic connection, opening into the injector high-pressure bore, and a flow restrictor for limiting the amount of fuel delivered to the injector, according to the invention essentially designed such that the bolt-like portion has an insert in which the flow restrictor is formed and which carries the first sealing surface , The bolt-like portion of the locking bolt is thus formed at least in two parts, wherein the insert faces the high pressure accumulator and ensures the sealing of the high pressure accumulator with the first sealing surface. The fact that the flow restrictor is now arranged in this insert, the difficult to manufacture geometries of the flow restrictor are limited to the use, so that the main body of the locking bolt is much easier to manufacture. In particular, the high pressure applied geometries of the body can be performed without manufacturing difficulties with the appropriate radii and surfaces. Furthermore, the two-part design means that the high-pressure bore of the locking bolt no longer has to extend through the entire locking pin, so that the use of a locking screw can be dispensed with, whereby the risk of manipulation by unauthorized persons is reduced. A further advantage is that the insert can be exchanged in a simple manner with a constant basic body, so that a simple adaptation of the closing amount of the flow restrictor succeeds by providing a plurality of inserts with a different design of the flow restrictor.
Der Einsatz muss nicht über eigene Verbindungsmittel verfügen, um mit dem Grundkörper verbunden zu werden. Vielmehr sieht eine bevorzugte Ausbildung vor, dass das Verschrauben des Grundkörpers mit dem Injektorkörper gleichzeitig die erforderliche Haltekraft für den Einsatz zur Verfügung stellt. Die Ausbildung ist zu diesem Zweck bevorzugt derart getroffen, dass der Einsatz eine Schulter mit einer zweiten, vorzugsweise kegeligen Dichtfläche aufweist, die mit einer Gegenfläche des bolzenartigen Abschnitts zusammenwirkt. Der Einschraubvorgang des Verschlussbolzens bringt dann die erforderliche Dichtkraft an beiden Dichtflächen gleichzeitig auf, nämlich an der ersten, zwischen dem Injektorkörper und dem Einsatz zur Wirkung gelangenden Dichtfläche und an der zweiten, zwischen dem Einsatz und dem Grundkörper des Verschlussbolzens bzw. des bolzenartigen Abschnitts zur Wirkung gelangenden Dichtfläche. Bevorzugt ist die erste und/oder die zweite Dichtfläche kegelig bzw. konisch ausgebildet.The insert does not have to have its own connection means to be connected to the base body. Rather, a preferred embodiment provides that the screwing of the base body with the injector body simultaneously provides the required holding force for use. The formation is preferably made for this purpose such that the insert has a shoulder with a second, preferably conical sealing surface, which cooperates with a counter surface of the bolt-like portion. The screwing of the locking bolt then brings the required sealing force on both sealing surfaces at the same time, namely on the first, between the injector body and the insert reaching the effective sealing surface and on the second, between the insert and the main body of the locking bolt or the bolt-like portion to effect reaching sealing surface. Preferably, the first and / or the second sealing surface is conical or conical.
Mit Vorteil ist ein insbesondere an die Schulter anschließender axialer Abschnitt des Einsatzes in einer Aufnahmebohrung des bolzenartigen Abschnitts aufgenommen. In diesem axialen Abschnitt kann besonders bevorzugt der Durchflussbegrenzer zumindest teilweise angeordnet werden, wodurch sich eine hohe Dauerfestigkeit erzielen lässt. Dies insbesondere wenn, wie dies einer bevorzugten Weiterbildung entspricht, der axiale Abschnitt des Einsatzes so in der Aufnahmebohrung aufgenommen ist, dass er von außen und von innen mit dem Druck des Hochdruckkraftstoffes beaufschlagbar ist. Dadurch wird ein druckausgeglichener Bereich geschaffen, der Druckschwingungen in wesentlich geringerem Ausmaß unterworfen ist. Insbesondere werden die auf die auf den Durchflussbegrenzer wirkenden Druckstöße minimiert. In dem druckausgeglichenen Bereich können die schwierig herzustellenden Geometrien des Durchflussbegrenzers ohne weiters realisiert werden, ohne die Dauerfestigkeit zu beeinträchtigen. Zur Erzielung eines druckausgeglichenen Bereichs ist der in der Aufnahmebohrung aufgenommene Abschnitt des Einsatzes zumindest in seinem vorderen Bereich mit einem gegenüber dem hinteren, dem Hochdruckspeicher zugewandten Bereich geringfügig verringerten Außendurchmesser ausgebildet. Weiters ist der Einsatz so ausgebildet, dass zwischen seiner Stirnfläche und dem Grund der Aufnahmebohrung ein Spalt verbleibt, damit der Einsatz in dem druckausgeglichenen Bereich von außen von Hochdruckkraftstoff beaufschlagt werden kann.Advantageously, a particular subsequent to the shoulder axial portion of the insert is received in a receiving bore of the bolt-like portion. In this axial section, the flow restrictor may particularly preferably be arranged at least partially, as a result of which high fatigue strength can be achieved. This in particular if, as corresponds to a preferred development, the axial portion of the insert is received in the receiving bore, that it can be acted upon from the outside and from the inside with the pressure of the high-pressure fuel. As a result, a pressure balanced area is created, which is subjected to pressure oscillations to a much lesser extent. In particular, the pressure surges acting on the flow restrictor are minimized. In the pressure balanced region, the difficult to manufacture flow restrictor geometries can be readily implemented without compromising fatigue strength. To achieve a pressure-compensated area of the recorded in the receiving bore portion of the insert is formed at least in its front region with respect to the rear, the high-pressure accumulator facing region slightly reduced outer diameter. Furthermore, the insert is designed so that a gap remains between its end face and the bottom of the receiving bore, so that the insert in the pressure-compensated region can be acted upon from the outside by high-pressure fuel.
Eine bevorzugte Weiterbildung sieht weiters vor, dass die Aufnahmebohrung am Übergang in die Hochdruckbohrung eine ringförmige Auflagefläche für das Schließglied, insbesondere die Kugel des Durchflussbegrenzers aufweist.A preferred development further provides that the receiving bore at the transition into the high pressure bore has an annular bearing surface for the closing member, in particular the ball of the flow restrictor.
Um während der Einspritzung von Kraftstoff in den Brennraum der Brennkraftmaschine ein Nachströmen von Kraftstoff in den Hochdruckspeicher zu ermöglichen und um eine gegenseitige Beeinflussung des Einspritzdrucks oder der Einspritzmenge der einzelnen Injektoren zu verhindern, ist bevorzugt vorgesehen, dass die Hochdruckbohrung über eine in dem Einsatz ausgebildete Drossel in den Injektor mündet. Die Anordnung der Drossel im Einsatz bringt den Vorteil mit sich, dass eine Anpassung des Drosselquerschnitts an die jeweiligen Bedürfnisse in einfacher Weise durch Austausch des Einsatzes gelingt, ohne dass hierfür der gesamte Verschlussbolzen ersetzt werden müsste.In order to enable a subsequent flow of fuel into the high-pressure accumulator during the injection of fuel into the combustion chamber of the internal combustion engine and to prevent mutual interference of the injection pressure or the injection quantity of the individual injectors, it is preferably provided that the high-pressure bore via a throttle formed in the insert opens into the injector. The arrangement of the throttle in use brings with it the advantage that an adaptation of the throttle cross section to the respective needs in easy way by replacing the insert succeeds, without requiring the entire locking pin would have to be replaced.
Bevorzugt ist im Einsatz ein Stabfilter angeordnet, der grobe Partikel aus dem Kraftstoff zurückhält.In use, a rod filter is preferably arranged which retains coarse particles from the fuel.
Die Erfindung wird nachfolgend anhand von in der Zeichnung schematisch dargestellten Ausführungsbeispielen näher erläutert. In dieser zeigen
In
Weiters ist eine den Verschlussbolzen 5 axial durchsetzende Hochdruckbohrung 11 vorgesehen, die auf der einen Seite mittels einer Verschlussschraube 12 verschlossen ist und auf der anderen Seite über eine Drossel 13 mit dem Hochdruckspeicher 2 in Verbindung steht. Die Verschlussschraube 11 weist einen zentralen Fortsatz 14 auf, der eine Kugel 15 des Durchflussbegrenzers 16 abstützt. Die Kugel 15 wird mittels einer Schraubenfeder 17 in Richtung zum Fortsatz 14 beaufschlagt. Der Ventilsitz des Durchflussbegrenzers 16 ist mit 18 bezeichnet. Die Funktion des Durchflussbegrenzers 16 ist wie folgt: Bei Common-Rail-Systemen können unter ungünstigen Umständen Leckagen auftreten, sei es im Leitungssystem oder durch defekte Einspritzventile. Einspritzventile mit klemmenden Düsennadeln, die zu Dauereinspritzungen in den Brennraum führen, können erhebliche Schäden verursachen. Diese Schäden können zum Brand des Fahrzeuges oder zur Zerstörung des Motors führen. Durchflussmengenbegrenzer mit Schließfunktion dienen der Vermeidung dieser Gefahren, die bei Überschreiten einer maximalen Entnahmemenge aus dem Hochdruckspeicher den Zulauf zu dem betroffenen Injektor verschließen und damit den einspritzpumpenseitigen Hochdruck von der Einspritzventilseite abkoppeln.Furthermore, a
Bei der Ausbildung gemäß
In der Hochdruckbohrung 11 ist weiters ein Stabfilter 19 angeordnet. In die Hochdruckbohrung 11 mündet eine radiale Leitung, die mit einem Hochdruckanschluss 20 ausgestattet ist. An den Hochdruckanschluss 20 ist eine nicht näher dargestellte Leitung angeschlossen, über welche die Zufuhr von Hochdruckkraftstoff von einer nicht dargestellten Hochdruckpumpe erfolgt. Der Verschlussbolzen 5 weist einen weiteren Hochdruckanschluss 21 auf, über den eine Verbindung zu einem nachfolgenden Injektor hergestellt werden kann.In the high-
Bei der Ausbildung gemäß
Bei der erfindungsgemäßen Ausbildung gemäß
Die Stirnfläche des axialen Abschnitts 23 endet in Abstand vor der am Übergang der Aufnahmebohrung 22 in die Hochdruckbohrung 11 vorgesehenen ringförmigen Auflagefläche 28. Weiters ist der in der Aufnahmebohrung 22 aufgenommene axiale Abschnitt 23 in seinem vorderen Bereich 27 mit einem verringerten Außendurchmesser ausgebildet, sodass in dem hierdurch entstehenden Ringspalt zwischen dem Außenumfang des vorderen Bereichs 27 des axialen Abschnitts 23 und der Aufnahmebohrung 22 der Druck des Hochdruckkraftstoffs von außen auf den Durchflussbegrenzer 16 zur Wirkung gelangen kann. Dies führt zu einem druckausgeglichenen Bereich des Durchflussbegrenzers 16, sodass die Schwingbelastung verringert wird.The end face of the
Claims (11)
- Closure bolt for an injector of a modular common-rail fuel injection system, comprising- at least one high-pressure port for high-pressure fuel,- a bolt-like portion (4) which can be inserted into an opening of the injector and which has a first, preferably conical sealing surface (6) for closing the opening in a high-pressure-tight manner, wherein the bolt-like portion has a high-pressure bore which is hydraulically connected to the high-pressure port and which issues into the injector, and- a throughflow limiter (16) for limiting the flow rate of fuel delivered into the injector, wherein the throughflow limiter (16) has a valve seat for a closing element so that the throughflow limiter separates the injector from the high-pressure fuel inflow in the event of an excessively high throughflow rate,
wherein the bolt-like portion (4) has an insert (24) in which the throughflow limiter (16) is formed and which bears the first sealing surface (6). - Closure bolt according to Claim 1, characterized in that the insert (24) has a shoulder (25) with a second, preferably conical sealing surface (26) which interacts with a counterpart surface of the bolt-like portion (4).
- Closure bolt according to Claim 1 or 2, characterized in that an axial portion (23), which in particular adjoins the shoulder (25), of the insert (24) is received in a receiving bore (22) of the bolt-like portion (4).
- Closure bolt according to Claim 3, characterized in that the throughflow limiter (16) is arranged at least partially in that axial portion (23) of the insert (24) which is received in the receiving bore (22).
- Closure bolt according to Claim 3 or 4, characterized in that the axial portion (23) of the insert (24) is received in the receiving bore (22) in such a way that it can be acted on with the pressure of the high-pressure fuel from the outside and from the inside.
- Closure bolt according to Claim 3, 4 or 5, characterized in that the receiving bore (22) has, at the transition to the high-pressure bore (11), an annular abutment surface (28) for the closing element of the throughflow limiter (16).
- Closure bolt according to Claim 6, characterized in that the closing element is realized as a ball (15).
- Closure bolt according to one of Claims 1 to 7, characterized in that the high-pressure bore (11) issues into the injector via a throttle (13) formed in the insert (24).
- Closure bolt according to one of Claims 1 to 8, characterized in that an edge-type filter (19) is arranged in the insert (24).
- Injector of a modular common-rail fuel injection system, comprising a high-pressure accumulator (2) which is integrated in the injector body (1) and which is closed off by means of a closure bolt (5) according to one of Claims 1 to 9.
- Injector according to Claim 10, characterized in that the closure bolt (5) and the injector body (1) are connected to one another by means of a clamping nut (7).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA548/2012A AT512162B1 (en) | 2012-05-08 | 2012-05-08 | Locking pin with flow limiter |
Publications (2)
Publication Number | Publication Date |
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EP2662557A1 EP2662557A1 (en) | 2013-11-13 |
EP2662557B1 true EP2662557B1 (en) | 2015-10-14 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13164996.4A Active EP2662557B1 (en) | 2012-05-08 | 2013-04-23 | Closure bolts with a flow limiting valve for an injector |
Country Status (6)
Country | Link |
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US (1) | US9279403B2 (en) |
EP (1) | EP2662557B1 (en) |
JP (1) | JP6366900B2 (en) |
KR (1) | KR102078521B1 (en) |
CN (1) | CN103388545B (en) |
AT (1) | AT512162B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US9803603B2 (en) * | 2013-03-01 | 2017-10-31 | Ganser-Hydromag Ag | Device for injecting fuel into the combustion chamber of an internal combustion engine |
DE102015220028A1 (en) * | 2015-10-15 | 2017-04-20 | Robert Bosch Gmbh | Flow restrictor for one injector |
DE102016206996B3 (en) * | 2016-04-25 | 2017-08-31 | Continental Automotive Gmbh | Switching valve for a fuel injection system and high-pressure fuel pump |
DE102019121156A1 (en) * | 2019-08-06 | 2021-02-11 | Woodward L'orange Gmbh | Use for a flow control valve |
US11346313B2 (en) * | 2020-09-03 | 2022-05-31 | Caterpillar Inc. | Fuel flow limiter assembly having integral fuel filter and fuel system using same |
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EP0780569A1 (en) * | 1995-12-19 | 1997-06-25 | Nippon Soken, Inc. | Accumulator fuel injection device |
DE102005010738A1 (en) * | 2005-03-09 | 2006-09-14 | Man Nutzfahrzeuge Ag | Flow limiter for high pressure screw connection with common-rail-injection system`s sealing surface, has throttle hole arranged at funnel point, where inner and outer surface of funnel corresponds with sealing surface of screw connection |
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GB8820706D0 (en) * | 1988-09-01 | 1988-10-05 | Lucas Ind Plc | Fuel injection systems |
DE9206268U1 (en) * | 1992-05-09 | 1993-09-09 | Robert Bosch Gmbh, 70469 Stuttgart | Fuel supply device for an injection nozzle |
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DE19860476A1 (en) * | 1998-12-28 | 2000-07-06 | Bosch Gmbh Robert | Fuel injection system |
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JP4100393B2 (en) * | 2004-10-29 | 2008-06-11 | 株式会社デンソー | Flow damper |
GB0508665D0 (en) * | 2005-04-28 | 2005-06-08 | Man B & W Diesel Ltd | Fuel injector |
EP1904741B1 (en) * | 2005-07-18 | 2010-11-17 | Ganser-Hydromag AG | Accumulator injection system for an internal combustion engine |
JP5046280B2 (en) * | 2007-05-30 | 2012-10-10 | 臼井国際産業株式会社 | Seal structure of common rail terminal |
EP2188516B1 (en) * | 2007-09-13 | 2011-10-26 | Ganser-Hydromag AG | Fuel injection device |
CH702496B1 (en) * | 2010-05-07 | 2011-07-15 | Liebherr Machines Bulle Sa | Power injector. |
AT509332B1 (en) * | 2010-06-22 | 2011-08-15 | Bosch Gmbh Robert | PRESSURE PIPE FITTING |
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US8596247B2 (en) * | 2010-07-13 | 2013-12-03 | Caterpillar Inc. | Fuel delivery assembly |
US8726884B2 (en) * | 2011-05-19 | 2014-05-20 | Caterpillar Inc. | Quill assembly for a dual fuel common rail fuel system |
-
2012
- 2012-05-08 AT ATA548/2012A patent/AT512162B1/en active
-
2013
- 2013-04-23 EP EP13164996.4A patent/EP2662557B1/en active Active
- 2013-05-07 CN CN201310240200.XA patent/CN103388545B/en active Active
- 2013-05-07 JP JP2013097363A patent/JP6366900B2/en active Active
- 2013-05-07 KR KR1020130051101A patent/KR102078521B1/en active IP Right Grant
- 2013-05-08 US US13/890,043 patent/US9279403B2/en active Active
Patent Citations (2)
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EP0780569A1 (en) * | 1995-12-19 | 1997-06-25 | Nippon Soken, Inc. | Accumulator fuel injection device |
DE102005010738A1 (en) * | 2005-03-09 | 2006-09-14 | Man Nutzfahrzeuge Ag | Flow limiter for high pressure screw connection with common-rail-injection system`s sealing surface, has throttle hole arranged at funnel point, where inner and outer surface of funnel corresponds with sealing surface of screw connection |
Also Published As
Publication number | Publication date |
---|---|
CN103388545A (en) | 2013-11-13 |
US9279403B2 (en) | 2016-03-08 |
KR102078521B1 (en) | 2020-02-19 |
EP2662557A1 (en) | 2013-11-13 |
JP6366900B2 (en) | 2018-08-01 |
KR20130125323A (en) | 2013-11-18 |
JP2013234661A (en) | 2013-11-21 |
AT512162A4 (en) | 2013-06-15 |
AT512162B1 (en) | 2013-06-15 |
CN103388545B (en) | 2017-08-25 |
US20130298873A1 (en) | 2013-11-14 |
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