EP3032085B1 - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- EP3032085B1 EP3032085B1 EP15192569.0A EP15192569A EP3032085B1 EP 3032085 B1 EP3032085 B1 EP 3032085B1 EP 15192569 A EP15192569 A EP 15192569A EP 3032085 B1 EP3032085 B1 EP 3032085B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve piece
- fuel injector
- piece
- clamping screw
- 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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- 239000000446 fuel Substances 0.000 title claims description 40
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 240000001439 Opuntia Species 0.000 description 1
- 235000004727 Opuntia ficus indica Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing 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
- 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
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
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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
- F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
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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
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
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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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/003—Valve inserts containing control chamber and valve piston
Definitions
- the invention relates to a fuel injector for a fuel injection system, in particular for a common rail injection system, having the features of the preamble of claim 1.
- the fuel injector comprises a control valve which serves to control a liftable injection valve member, at least one injection opening releasable or closable via the lifting movement is.
- the control valve comprises a valve piece, which is inserted into a holding body of the fuel injector and fixed in position by means of a valve clamping screw.
- the valve piece has a hollow cylindrical portion in which an end portion of the injection valve member is received and guided, so that the injection valve member and the valve piece together define a control space.
- the control valve is opened, so that is able to flow out of the control chamber via an outlet channel formed in the valve piece and a throttle formed therein. If the control valve is closed, pressure builds up in the control chamber due to inflowing fuel, which enters the control chamber via an inlet throttle.
- valve piece of the illustrated control valve has a shoulder sloping radially outwards for supporting the valve clamping screw.
- the shoulder-supported End face of the valve clamping screw also runs obliquely to allow a flat contact with the shoulder of the valve piece.
- the present invention seeks to provide a fuel injector for a fuel injection system, in particular for a common rail injection system, which is robust and easy and inexpensive to manufacture.
- the fuel injector proposed for a fuel injection system comprises a holding body and a control valve, wherein the control valve has a rotationally symmetrical valve piece inserted into the holding body, in which a discharge throttle is formed. Furthermore, the proposed fuel injector comprises a valve clamping screw for axially fixing the position of the valve piece in the holding body.
- the valve clamping screw is supported directly or indirectly on a radially outwardly inclined sloping shoulder of the valve piece. According to the invention it is provided that the valve clamping screw has a shoulder of the valve piece facing flat executed end face.
- the valve clamping screw is also supported directly on a limiting the end face, radially inner annular edge on the shoulder of the valve piece.
- a "flat end face” is understood as meaning a radially extending end face. This means that the end face is perpendicular to the longitudinal axis of the valve clamping screw. Such an end face is much simpler and thus cheaper to produce than a sloping face.
- the pressure force applied to the valve piece via the valve clamping screw is divided into an axially acting first force component and a radially acting second force component. While the axially acting first force component serves to fix the position of the valve piece in the holding body of the fuel injector, it is possible via the radially acting second force component to bring about a prestressing of the valve piece which increases the strength. Because the bias induces compressive stresses in the valve piece, which are able to compensate for tensile stresses that occur especially in high-pressure load of the valve member in the field of drain throttle. Thus, the high pressure resistance of the valve piece of the control valve increases, so that it can be used at higher system pressures than is currently the case. Alternatively or additionally, a less expensive material can be used for producing the valve piece, since a failure is no longer to be feared, at least at the currently prevailing system pressures.
- the radially outwardly sloping shoulder is formed on a plate-shaped portion of the valve piece.
- the valve member is supported on a radially extending shoulder of the holding body of the fuel injector, so that via the valve clamping screw a compressive force is exerted on the valve piece having an axially acting first force component for the axial bias of the valve member in the direction of the radially extending shoulder and a comprises radially acting second force component.
- the radially acting second force component causes a bias of the valve piece, which acts to increase strength. Because of the bias a relief of the strength-critical areas of the valve piece is effected. These areas include in particular the area in which the outlet throttle is formed.
- annular surface is preferably formed on the side of the plate-shaped portion of the valve piece facing away from the valve clamping screw.
- the formation of a plate-shaped portion requires an enlarged outer diameter, which also acts to increase strength.
- a diffuser is formed in the valve piece between the outlet throttle and a valve seat.
- the diffuser may be formed immediately downstream of the outlet throttle in the flow direction of the outflowing fuel.
- the outlet throttle can open into the valve seat via the diffuser.
- the diffuser is used for flow optimization.
- the outlet throttle, the valve seat and / or the diffuser is or are arranged in the region of the plate-shaped portion of the valve piece. This means that the outlet throttle, the valve seat and / or the diffuser preferably in a portion of the valve piece to lie comes or come, which has a higher strength by the bias on the directly or indirectly supported on the sloping shoulder valve clamping screw.
- This is advantageous insofar as the outlet throttle, the valve seat and / or the diffuser, if present, weaken the valve piece. However, this weakening is compensated by the bias.
- the valve piece has a hollow cylindrical portion for forming and limiting a control chamber, which is relieved via the outlet throttle, the valve seat and / or the diffuser.
- the control pressure in the control room is controlled.
- the control pressure in the control chamber can influence the axial position of the injection valve member of the fuel injector.
- an end portion of a liftable injection valve member is received in the hollow cylindrical portion of the valve piece, via the lifting movement of which at least one injection opening of the fuel injector is releasable or closable.
- the control valve can be used in this case for controlling the lifting movement of the injection valve member of the fuel injector.
- control valve when the control valve is open, the control chamber is relieved via the outlet throttle, so that a pressure drop relieving the injection valve member in the control chamber is effected.
- the Indian Fig. 1 illustrated, not inventive fuel injector comprises a control valve with a valve piece 2, which has a plate-shaped portion 12 through which the valve member 2 is supported on a radially extending shoulder 13 of a holding body 1 of the fuel injector.
- a sloping sloping shoulder 5 is formed radially outside, on which indirectly via a pressure ring 8, a valve clamping screw 4 is supported, which is screwed to fix the position of the valve member 2 in the holding body 1.
- the valve clamping screw 4 exerts indirectly via the pressure ring 8 a compressive force on the valve piece 2, which not only has an axially acting force component in the direction of paragraph 13 due to the sloping shoulder 5, but also a radially acting force component.
- the latter causes a bias of the valve piece 2 in the radial direction, which in turn leads to an increase in the strength in a strength-critical area of the valve piece 2, in the present case, a discharge throttle 3 and a diffuser 15 are formed.
- a discharge throttle 3 and a diffuser 15 are formed.
- high local tensile stresses resulting from the tightening torque of the valve clamping screw 4 and / or from the load of the valve member 2 with system pressure.
- the radial preload helps to compensate for these tensile stresses.
- the inserted between the valve piece 2 and the valve clamping screw 4 pressure ring 8 is triangular in cross-section, so that a radially extending first contact surface 9 for abutment of a flat end face 6 of the valve clamping screw 4 and an inclined second contact surface 10 for support on the sloping shoulder 5 of the valve piece 2 are formed.
- the inclined contact surface 10 is - according to the sloping shoulder 5 of the valve piece 2 - inclined at an angle of 45 ° relative to a radial plane 11 (see also Fig. 2 ).
- a pressure ring 8 is enlarged in the Fig. 3 shown. In contrast to the pressure ring 8 here is the angle ⁇ ⁇ 45 °, that is flattened. The use of such a pressure ring 8 has the consequence that the applied via the valve clamping screw 4 axial force component is greater than the force acting in the radial direction of the force component.
- control valve is a hollow cylindrical portion 16 attached to the plate-shaped portion 12 of the valve member 2, in which an end portion of an injection valve member 18 is received and guided.
- the valve piece 2 and the injection valve member 18 together define a control chamber 17 which can be relieved via the outlet throttle 3 formed in the valve piece 2 (see FIG Fig. 1 ).
- the outlet throttle 3 is formed in a flow channel 19, which connects the outlet throttle 3 with the control chamber 17.
- the diffuser 15 connects (see Fig. 1 ).
- a further hollow cylindrical portion 22 is attached, which in the present case, the leadership of a cooperating with a valve seat 14 liftable armature 20 is used.
- the armature 20 is axially biased in the direction of the valve seat 14. If now an electromagnet 21 of the control valve is energized, forms a magnetic field whose magnetic force lifts the armature 20 from the valve seat 14, so that the control valve opens.
- the result of opening the control valve is that fuel flows out of the control chamber 17 via the outlet channel 19, the outlet throttle 3, the diffuser 15 and the valve seat 14, so that the pressure in the control chamber 17 drops.
- the injection valve member 18 of the fuel injector is relieved in this way and is able to open.
- the Fig. 4 shows an embodiment of a fuel injector according to the invention.
- the valve tightening screw 4 is supported directly on the obliquely sloping shoulder 5 of the valve piece 2 via an annular edge 7 that radially delimits the flat end 6.
- the edge 7 forms a kind of biting edge, which is limited plastically deformable to a uniform contact of the valve clamping screw 4 at the obliquely to ensure sloping shoulder 5 of the valve piece 2.
- the outlet throttle 3 opens on the one hand directly into the control chamber 17, on the other hand into the diffuser 15.
- the diffuser 15 opens in the direction of the valve seat 14.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung betrifft einen Kraftstoffinjektor für ein Kraftstoffeinspritzsystem, insbesondere für ein Common-Rail-Einspritzsystem, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Der Kraftstoffinjektor umfasst ein Steuerventil, das der Ansteuerung eines hubbeweglichen Einspritzventilglieds dient, über dessen Hubbewegung mindestens eine Einspritzöffnung freigebbar oder verschließbar ist.The invention relates to a fuel injector for a fuel injection system, in particular for a common rail injection system, having the features of the preamble of claim 1. The fuel injector comprises a control valve which serves to control a liftable injection valve member, at least one injection opening releasable or closable via the lifting movement is.
Aus der Offenlegungsschrift
Wie der vorstehend genannten Offenlegungsschrift ferner zu entnehmen ist, weist das Ventilstück des dargestellten Steuerventils eine nach radial außen schräg abfallende Schulter zur Abstützung der Ventilspannschraube auf. Die an der Schulter abgestützte Stirnfläche der Ventilspannschraube verläuft ebenfalls schräg, um eine flächige Anlage an der Schulter des Ventilstücks zu ermöglichen. Diese Ausbildung besitzt den Vorteil, dass über die Ventilspannschraube nicht nur eine Axialkraft in das Ventilstück eingeleitet wird, sondern ferner eine in radialer Richtung wirkende Kraft, die einer Aufweitung des Ablaufkanals unter Hochdruckbelastung entgegen wirkt.As can also be seen from the above-mentioned published patent application, the valve piece of the illustrated control valve has a shoulder sloping radially outwards for supporting the valve clamping screw. The shoulder-supported End face of the valve clamping screw also runs obliquely to allow a flat contact with the shoulder of the valve piece. This design has the advantage that not only an axial force is introduced into the valve piece via the valve clamping screw, but also a force acting in the radial direction, which counteracts a widening of the flow channel under high-pressure load.
Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Kraftstoffinjektor für ein Kraftstoffeinspritzsystem, insbesondere für ein Common-Rail-Einspritzsystem, anzugeben, der robust sowie einfach und kostengünstig herzustellen ist.Based on the above-mentioned prior art, the present invention seeks to provide a fuel injector for a fuel injection system, in particular for a common rail injection system, which is robust and easy and inexpensive to manufacture.
Zur Lösung der Aufgabe wird der Kraftstoffinjektor mit den Merkmalen des Anspruchs 1 angegeben. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.To achieve the object of the fuel injector with the features of claim 1 is given. Advantageous developments of the invention can be found in the dependent claims.
Der für ein Kraftstoffeinspritzsystem, insbesondere für ein Common-Rail-Einspritzsystem, vorgeschlagene Kraftstoffinjektor umfasst einen Haltekörper und ein Steuerventil, wobei das Steuerventil ein in den Haltekörper eingesetztes rotationssymmetrisch ausgebildetes Ventilstück besitzt, in dem eine Ablaufdrossel ausgebildet ist. Ferner umfasst der vorgeschlagene Kraftstoffinjektor eine Ventilspannschraube zur axialen Lagefixierung des Ventilstücks im Haltekörper. Die Ventilspannschraube ist dabei unmittelbar oder mittelbar an einer nach radial außen schräg abfallenden Schulter des Ventilstücks abgestützt. Erfindungsgemäß ist vorgesehen, dass die Ventilspannschraube eine der Schulter des Ventilstücks zugewandte eben ausgeführte Stirnfläche besitzt. Die Ventilspannschraube ist zudem unmittelbar über eine die Stirnfläche begrenzende, radial innen liegende ringförmige Kante an der Schulter des Ventilstücks abgestützt.The fuel injector proposed for a fuel injection system, in particular for a common rail injection system, comprises a holding body and a control valve, wherein the control valve has a rotationally symmetrical valve piece inserted into the holding body, in which a discharge throttle is formed. Furthermore, the proposed fuel injector comprises a valve clamping screw for axially fixing the position of the valve piece in the holding body. The valve clamping screw is supported directly or indirectly on a radially outwardly inclined sloping shoulder of the valve piece. According to the invention it is provided that the valve clamping screw has a shoulder of the valve piece facing flat executed end face. The valve clamping screw is also supported directly on a limiting the end face, radially inner annular edge on the shoulder of the valve piece.
Unter einer "eben ausgeführten Stirnfläche" wird vorliegend eine radial verlaufende Stirnfläche verstanden. Das heißt, dass die Stirnfläche senkrecht zur Längsachse der Ventilspannschraube verläuft. Eine solche Stirnfläche ist wesentlich einfacher und damit kostengünstiger als eine schräg verlaufende Stirnfläche herzustellen.In the present case, a "flat end face" is understood as meaning a radially extending end face. This means that the end face is perpendicular to the longitudinal axis of the valve clamping screw. Such an end face is much simpler and thus cheaper to produce than a sloping face.
Sofern die Abstützung der Ventilspannschraube am Ventilstück unmittelbar erfolgt, gelangt lediglich eine ringförmige Kante, welche die eben ausgeführte Stirnfläche der Ventilspannschraube radial innen begrenzt, zur Anlage an der schräg abfallenden Schulter des Ventilstücks. Durch die Reduzierung der Abstützfläche auf eine ringförmige Kante kann die Druckkraft auf das Ventilstück erhöht werden.If the support of the valve clamping screw takes place directly on the valve piece, only an annular edge, which limits the flat end face of the valve clamping screw radially inward, comes to rest on the sloping shoulder of the valve piece. By reducing the support surface to an annular edge, the pressure on the valve piece can be increased.
Aufgrund der Abstützung an der schräg abfallenden Schulter teilt sich die über die Ventilspannschraube auf das Ventilstück aufgebrachte Druckkraft in eine axial wirkende erste Kraftkomponente und eine radial wirkende zweite Kraftkomponente auf. Während die axial wirkende erste Kraftkomponente der Lagefixierung des Ventilstücks im Haltekörper des Kraftstoffinjektors dient, kann über die radial wirkende zweite Kraftkomponente eine Vorspannung des Ventilstücks bewirkt werden, die festigkeitssteigernd wirkt. Denn die Vorspannung induziert Druckspannungen im Ventilstück, die in der Lage sind, Zugspannungen zu kompensieren, die insbesondere bei Hochdruckbelastung des Ventilstücks im Bereich der Ablaufdrossel auftreten. Damit steigt die Hochdruckfestigkeit des Ventilstücks des Steuerventils, so dass dieses bei höheren Systemdrücken als derzeit üblich einsetzbar ist. Alternativ oder ergänzend kann ein kostengünstigerer Werkstoff zur Herstellung des Ventilstücks verwendet werden, da ein Versagen zumindest bei den derzeit üblichen Systemdrücken nicht mehr zu befürchten ist.Due to the support on the sloping shoulder, the pressure force applied to the valve piece via the valve clamping screw is divided into an axially acting first force component and a radially acting second force component. While the axially acting first force component serves to fix the position of the valve piece in the holding body of the fuel injector, it is possible via the radially acting second force component to bring about a prestressing of the valve piece which increases the strength. Because the bias induces compressive stresses in the valve piece, which are able to compensate for tensile stresses that occur especially in high-pressure load of the valve member in the field of drain throttle. Thus, the high pressure resistance of the valve piece of the control valve increases, so that it can be used at higher system pressures than is currently the case. Alternatively or additionally, a less expensive material can be used for producing the valve piece, since a failure is no longer to be feared, at least at the currently prevailing system pressures.
Mit Senkung der Kosten für die Herstellung des Steuerventils sinken auch die Herstellungskosten des Kraftstoffinjektors. Denn sowohl bei der unmittelbaren, als auch bei der mittelbaren Abstützung der Ventilspannschraube am Ventilstück können aufgrund der radialen Vorspannung des Ventilstücks kostengünstigere Werkstoffe eingesetzt werden.As the cost of manufacturing the control valve is reduced, the cost of manufacturing the fuel injector also decreases. Because both in the direct, as well as in the indirect support of the valve clamping screw on the valve piece cheaper materials can be used due to the radial bias of the valve piece.
Bei der unmittelbaren Abstützung der Ventilspannschraube am Ventilstück muss keine Modifizierung an der Ventilspannschraube selbst vorgenommen werden, da die Abstützung über eine eben ausgeführte Stirnfläche der Ventilspannschraube erfolgt. Es gilt, dass mit größer werdendem Winkel auch die in radialer Richtung wirkende Kraftkomponente der über die Ventilspannschraube erzeugten Druckkraft zunimmt. Ist der Winkel, wie vorliegend der Fall, bevorzugt kleiner 45°, ist sichergestellt, dass die axiale Kraftkomponente größer als die radiale Kraftkomponente ist. Dies ist zum einen erforderlich, um eine ausreichende Lagefixierung des Ventilstücks im Haltekörper zu bewirken. Zum anderen kann über die axial wirkende Kraftkomponente zugleich eine Abdichtung eines Hochdruckbereichs des Kraftstoffinjektors gegenüber einem Niederdruckbereich erreicht werden, wenn diese ausreichend groß ist.In the case of direct support of the valve clamping screw on the valve piece, no modification to the valve clamping screw itself has to be made, since the support takes place via a flat end face of the valve clamping screw. It is true that with an increasing angle, the force component acting in the radial direction of the pressure force generated via the valve clamping screw also increases. If the angle, as in the present case, is preferably less than 45 °, it is ensured that the axial force component is greater than the radial force component. This is firstly necessary to effect a sufficient positional fixation of the valve piece in the holding body. On the other hand, a sealing of a high-pressure region of the fuel injector with respect to a low-pressure region can be achieved at the same time via the axially acting force component if this is sufficiently large.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist die nach radial außen schräg abfallende Schulter an einem plattenförmigen Abschnitt des Ventilstücks ausgebildet. Über den plattenförmigen Abschnitt ist das Ventilstück an einem radial verlaufenden Absatz des Haltekörpers des Kraftstoffinjektors abgestützt, so dass über die Ventilspannschraube eine Druckkraft auf das Ventilstück ausgeübt wird, die eine axial wirkende erste Kraftkomponente zur axialen Vorspannung des Ventilstücks in Richtung des radial verlaufenden Absatzes sowie eine radial wirkende zweite Kraftkomponente umfasst. Die radial wirkende zweite Kraftkomponente bewirkt eine Vorspannung des Ventilstücks, die festigkeitssteigernd wirkt. Denn über die Vorspannung wird eine Entlastung der festigkeitskritischen Bereiche des Ventilstücks bewirkt. Zu diesen Bereichen zählt insbesondere der Bereich, in dem die Ablaufdrossel ausgebildet ist. Mit der erhöhten Festigkeit des Ventilstücks des Steuerventils steigt auch die Robustheit des Kraftstoffinjektors, in den das Ventilstück eingesetzt ist. Der Kraftstoffinjektor kann demzufolge bei höheren Systemdrücken eingesetzt werden.According to a preferred embodiment of the invention, the radially outwardly sloping shoulder is formed on a plate-shaped portion of the valve piece. About the plate-shaped portion, the valve member is supported on a radially extending shoulder of the holding body of the fuel injector, so that via the valve clamping screw a compressive force is exerted on the valve piece having an axially acting first force component for the axial bias of the valve member in the direction of the radially extending shoulder and a comprises radially acting second force component. The radially acting second force component causes a bias of the valve piece, which acts to increase strength. Because of the bias a relief of the strength-critical areas of the valve piece is effected. These areas include in particular the area in which the outlet throttle is formed. With the increased strength of the valve member of the control valve also increases the robustness of the fuel injector, in which the valve piece is inserted. The fuel injector can therefore be used at higher system pressures.
Zur Abstützung des Ventilstücks am radial verlaufenden Absatz des Haltekörpers ist bevorzugt auf der der Ventilspannschraube abgewandten Seite des plattenförmigen Abschnitts des Ventilstücks eine ringförmige Fläche ausgebildet. Die Ausbildung eines plattenförmigen Abschnitts erfordert einen vergrößerten Außendurchmesser, der ebenfalls festigkeitssteigernd wirkt.To support the valve piece on the radially extending shoulder of the holding body, an annular surface is preferably formed on the side of the plate-shaped portion of the valve piece facing away from the valve clamping screw. The formation of a plate-shaped portion requires an enlarged outer diameter, which also acts to increase strength.
In Weiterbildung der Erfindung wird vorgeschlagen, dass zwischen der Ablaufdrossel und einem Ventilsitz ein Diffusor im Ventilstück ausgebildet ist. Der Diffusor kann in Strömungsrichtung des ablaufenden Kraftstoffs unmittelbar anschließend an die Ablaufdrossel ausgebildet sein. Insbesondere kann die Ablaufdrossel über den Diffusor in den Ventilsitz münden. Der Diffusor dient der Strömungsoptimierung. Vorzugsweise ist bzw. sind die Ablaufdrossel, der Ventilsitz und/oder der Diffusor im Bereich des plattenförmigen Abschnitts des Ventilstücks angeordnet. Das heißt, dass die Ablaufdrossel, der Ventilsitz und/oder der Diffusor bevorzugt in einem Abschnitt des Ventilstücks zu liegen kommt bzw. kommen, der durch die Vorspannung über die an der schräg abfallenden Schulter unmittelbar oder mittelbar abgestützten Ventilspannschraube eine höhere Festigkeit besitzt. Dies ist insoweit von Vorteil, als die Ablaufdrossel, der Ventilsitz und/oder der Diffusor, sofern vorhanden, das Ventilstück schwächen. Diese Schwächung wird durch die Vorspannung jedoch kompensiert.In a further development of the invention, it is proposed that a diffuser is formed in the valve piece between the outlet throttle and a valve seat. The diffuser may be formed immediately downstream of the outlet throttle in the flow direction of the outflowing fuel. In particular, the outlet throttle can open into the valve seat via the diffuser. The diffuser is used for flow optimization. Preferably, the outlet throttle, the valve seat and / or the diffuser is or are arranged in the region of the plate-shaped portion of the valve piece. This means that the outlet throttle, the valve seat and / or the diffuser preferably in a portion of the valve piece to lie comes or come, which has a higher strength by the bias on the directly or indirectly supported on the sloping shoulder valve clamping screw. This is advantageous insofar as the outlet throttle, the valve seat and / or the diffuser, if present, weaken the valve piece. However, this weakening is compensated by the bias.
Bevorzugt besitzt das Ventilstück einen hohlzylinderförmigen Abschnitt zur Ausbildung und Begrenzung eines Steuerraums, der über die Ablaufdrossel, den Ventilsitz und/oder den Diffusor entlastbar ist. Das heißt, dass andernends die Ablaufdrossel unmittelbar oder mittelbar über einen Ablaufkanal in den Steuerraum mündet. Über die Schaltstellung des Steuerventils ist demnach der Steuerdruck im Steuerraum steuerbar. Über den Steuerdruck im Steuerraum kann wiederum Einfluss auf die axiale Lage des Einspritzventilglieds des Kraftstoffinjektors genommen werden.Preferably, the valve piece has a hollow cylindrical portion for forming and limiting a control chamber, which is relieved via the outlet throttle, the valve seat and / or the diffuser. This means that at the other end the outlet throttle opens directly or indirectly via a drainage channel into the control chamber. On the switching position of the control valve, therefore, the control pressure in the control room is controlled. In turn, the control pressure in the control chamber can influence the axial position of the injection valve member of the fuel injector.
Des Weiteren bevorzugt ist in dem hohlzylinderförmigen Abschnitt des Ventilstücks ein Endabschnitt eines hubbeweglichen Einspritzventilgliedes aufgenommen, über dessen Hubbewegung mindestens eine Einspritzöffnung des Kraftstoffinjektors freigebbar oder verschließbar ist. Das Steuerventil kann in diesem Fall zur Steuerung der Hubbewegung des Einspritzventilglieds des Kraftstoffinjektors eingesetzt werden.Further preferably, an end portion of a liftable injection valve member is received in the hollow cylindrical portion of the valve piece, via the lifting movement of which at least one injection opening of the fuel injector is releasable or closable. The control valve can be used in this case for controlling the lifting movement of the injection valve member of the fuel injector.
Hierzu ist des Weiteren bevorzugt vorgesehen, dass bei geöffnetem Steuerventil der Steuerraum über die Ablaufdrossel entlastbar ist, so dass ein das Einspritzventilglied entlastender Druckabfall im Steuerraum bewirkt wird.For this purpose, it is further preferably provided that when the control valve is open, the control chamber is relieved via the outlet throttle, so that a pressure drop relieving the injection valve member in the control chamber is effected.
Die Erfindung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:
-
Fig. 1 einen schematischen Längsschnitt durch einen nicht erfindungsgemäßen Kraftstoffinjektor im Bereich des Steuerventils, -
Fig. 2 einen Ausschnitt derFig. 1 in vergrößerter Darstellung, -
Fig. 3 eine Schnittansicht eines nicht erfindungsgemäßen Druckrings für ein Steuerventil eines erfindungsgemäßes Kraftstoffinjektors und -
Fig. 4 einen schematischen Längsschnitt durch eine Ausführungsform eines erfindungsgemäßen Kraftstoffinjektors im Bereich des Steuerventils.
-
Fig. 1 a schematic longitudinal section through a non-inventive fuel injector in the region of the control valve, -
Fig. 2 a section of theFig. 1 in an enlarged view, -
Fig. 3 a sectional view of a non-inventive pressure ring for a control valve of a fuel injector according to the invention and -
Fig. 4 a schematic longitudinal section through an embodiment of a fuel injector according to the invention in the region of the control valve.
Der in der
Der zwischen dem Ventilstück 2 und der Ventilspannschraube 4 eingelegte Druckring 8 ist im Querschnitt dreieckig ausgeführt, so dass eine radial verlaufende erste Anlagefläche 9 zur Anlage einer eben ausgeführten Stirnfläche 6 der Ventilspannschraube 4 und eine schräg verlaufende zweite Anlagefläche 10 zur Abstützung an der schräg abfallenden Schulter 5 des Ventilstücks 2 ausgebildet werden. Die schräg verlaufende Anlagefläche 10 ist - entsprechend der schräg abfallenden Schulter 5 des Ventilstücks 2 - in einem Winkel von 45° gegenüber einer Radialebene 11 geneigt (siehe auch
Ein Druckring 8 ist vergrößert in der
Bei dem in den
Die Ablaufdrossel 3 ist in einem Ablaufkanal 19 ausgebildet, der die Ablaufdrossel 3 mit dem Steuerraum 17 verbindet. An die Ablaufdrossel 3 schließt sich der Diffusor 15 an (siehe
An den plattenförmigen Abschnitt 12 des Ventilstücks 2 ist ein weiterer hohlzylinderförmiger Abschnitt 22 angesetzt, der vorliegend der Führung eines mit einem Ventilsitz 14 zusammenwirkenden hubbeweglichen Ankers 20 dient. Der Anker 20 ist in Richtung des Ventilsitzes 14 axial vorgespannt. Wird nunmehr ein Elektromagnet 21 des Steuerventils bestromt, bildet sich ein Magnetfeld aus, dessen Magnetkraft den Anker 20 aus dem Ventilsitz 14 hebt, so dass das Steuerventil öffnet. Das Öffnen des Steuerventils hat zur Folge, dass Kraftstoff über den Ablaufkanal 19, die Ablaufdrossel 3, den Diffusor 15 und den Ventilsitz 14 aus dem Steuerraum 17 abströmt, so dass der Druck im Steuerraum 17 abfällt. Das Einspritzventilglied 18 des Kraftstoffinjektors wird auf diese Weise entlastet und vermag zu öffnen.To the plate-shaped
Der
Claims (6)
- Fuel injector for a fuel injection system, in particular for a common rail injection system, comprising a retaining body (1) and a control valve, wherein the control valve has a valve piece (2) inserted into the retaining body (1) and formed in a rotationally symmetric manner, in which an outflow throttle (3) is formed, furthermore comprising a valve clamping screw (4) for axially fixing the position of the valve piece (2) in the retaining body (1), wherein the valve clamping screw (4) is supported directly or indirectly on a shoulder (5), downwardly inclined radially towards the outside, of the valve piece (2),
characterized in that
the valve clamping screw (4) has an end face (6) that is embodied in a planar manner and faces the shoulder (5) of the valve piece (2), and in that the valve clamping screw (4) is supported on the shoulder (5) of the valve piece (2) directly via a radially internal annular edge (7) bordering the end face (6). - Fuel injector according to Claim 1,
characterized in that the shoulder (5) downwardly inclined radially towards the outside is formed on a plate-form portion (12) of the valve piece (2), via which portion (12) the valve piece (2) is supported on a radially extending ledge (13) of the retaining body (1) of the fuel injector, such that a pressure force is exerted on the valve piece (2) via the valve clamping screw (4), said pressure force comprising an axially acting first force component for axially preloading the valve piece (2) in the direction of the radially extending ledge (13), and a radially acting second force component. - Fuel injector according to Claim 1 or 2,
characterized in that, between the outflow throttle (3) and a valve seat (14), a diffusor (15) is formed in the valve piece (2), wherein, preferably, the outflow throttle (3), the valve seat (14) and/or the diffusor (15) is or are arranged in the region of the plate-form portion (12) of the valve piece (2). - Fuel injector according to one of Claims 1, 2 and 3,
characterized in that the valve piece (2) has a hollow-cylindrical portion (16) for forming and bordering a control chamber (17), which is able to be relieved of pressure via the outflow throttle (3), the valve seat (14) and/or the diffusor (15). - Fuel injector according to Claim 4,
characterized in that, in the hollow-cylindrical portion (16) of the valve piece (2), an end portion of an injection valve member (18) that is able to perform a stroke motion is accommodated, at least one injection opening of the fuel injector being openable or closable via the stroke motion thereof. - Fuel injector according to Claim 4 or 5,
characterized in that, with the control valve open, the control chamber (16) is able to be relieved of pressure via the outflow throttle (3), such that a pressure drop that relieves the injection valve member (18) of pressure is brought about in the control chamber (17).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014225293.8A DE102014225293A1 (en) | 2014-12-09 | 2014-12-09 | fuel injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3032085A1 EP3032085A1 (en) | 2016-06-15 |
EP3032085B1 true EP3032085B1 (en) | 2019-01-09 |
Family
ID=54365148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15192569.0A Active EP3032085B1 (en) | 2014-12-09 | 2015-11-02 | Fuel injector |
Country Status (2)
Country | Link |
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EP (1) | EP3032085B1 (en) |
DE (1) | DE102014225293A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102018204492A1 (en) * | 2018-03-23 | 2019-09-26 | Robert Bosch Gmbh | fuel injector |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10018663A1 (en) * | 2000-04-14 | 2001-10-25 | Siemens Ag | Injection valve with optimised surface geometry between nozzle body and clamp nut enabling optimised transfer of compression force to nozzle body |
DE102004047090A1 (en) * | 2004-09-29 | 2006-03-30 | Robert Bosch Gmbh | Solenoid valve for e.g. common-rail system, has valve clamping screw and setting unit that cooperate in such a manner that unit is deformable by changing position of screw within valve body, to allow change of thickness of unit |
DE102006021736A1 (en) | 2006-05-10 | 2007-11-15 | Robert Bosch Gmbh | Fuel injector with pressure compensated control valve |
DE102008005523A1 (en) * | 2008-01-23 | 2009-07-30 | Robert Bosch Gmbh | fuel injector |
DE202008009036U1 (en) * | 2008-07-04 | 2009-11-12 | Robert Bosch Gmbh | Valve clamping nut |
-
2014
- 2014-12-09 DE DE102014225293.8A patent/DE102014225293A1/en not_active Withdrawn
-
2015
- 2015-11-02 EP EP15192569.0A patent/EP3032085B1/en active Active
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EP3032085A1 (en) | 2016-06-15 |
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