EP2664779B1 - Valve for metering out fluid - Google Patents
Valve for metering out fluid Download PDFInfo
- Publication number
- EP2664779B1 EP2664779B1 EP13160890.3A EP13160890A EP2664779B1 EP 2664779 B1 EP2664779 B1 EP 2664779B1 EP 13160890 A EP13160890 A EP 13160890A EP 2664779 B1 EP2664779 B1 EP 2664779B1
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- EP
- European Patent Office
- Prior art keywords
- valve
- valve needle
- needle
- slot
- deformation
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
- F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0685—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature and the valve being allowed to move relatively to each other or not being attached to each other
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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 F02M39/00Â -Â F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00Â -Â F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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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
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
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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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
Definitions
- a magnet armature of a valve needle actuating electromagnet frictionally fixed on the valve needle is a magnet armature of a valve needle actuating electromagnet frictionally fixed on the valve needle.
- the valve needle has a closing body, which forms a sealing seat together with the valve seat at the valve opening.
- a return spring which is supported between the end of the valve needle facing away from the closing body and an adjusting sleeve, presses the closing body onto the valve seat.
- the valve needle has a collar-shaped anchor stop and a Mitauerflansch, between which the magnet armature is able to move axially on the valve needle.
- a Vorhubfeder presses the armature to the anchor stop.
- Ankerkeweg are off DE 198 49 210 A1 .
- a fuel injection valve with an electromagnetic actuator is known.
- This valve is characterized in that a needle of this needle valve is provided for an electromechanical fuel injection device comprising the needle valve which is movable in first and second directions to abut and lift off a valve seat assembly, the needle being of the shape a pipe and has damping means.
- the valve seat in the valve seat assembly forms a stop for the needle valve as it moves in the first direction.
- the needle has a plurality of grooves, grooves or corrugations around the circumference of the tube to reduce rebound movements of the needle valve when the valve needle contacts the valve seat by reducing the axial and bending spring rate of the needle valve. In this way, the vibration behavior of the needle is changed to achieve control over the rebounding movements.
- the metering valve according to the invention with the features of claim 1 has the advantage that the advantages of the valves with so-called.
- Ankerkaweg such as avoid bouncing and mechanical booster, preserved by the formation of the valve needle with different stiffness in tension and compression direction, without the disadvantages associated with these known structural designs of these valves, such as a variety of components and joints, high manufacturing costs, dependency on manufacturing tolerances and fluid used by existing hydraulic crimp, exhibit.
- the number of components in the valve according to the invention is not greater than for valves with a rigid connection Actuator and valve needle, and accordingly simplifies the assembly process. Since less function-determining tolerances are to be observed, the production costs and the sample spread in the functional values, in particular in the quantitative metering of fluid, are reduced.
- the predetermined load from which elastic deformations of the valve needle occur chosen smaller than the sum of the minimum allowable restoring or closing force acting in the pressure direction on the valve needle return member and a minimum existing closing force of the fluid the valve needle is exerted with closing body.
- acting on the valve needle in the compression direction greater closing forces occurs elastic deformation of the valve needle one.
- the closing body Due to the increasing deformation with increasing stiffness of the valve needle, the closing body is pressed more strongly on the valve seat, so that a defined assignment of actuator and valve needle is ensured in the idle state of the closed valve, such as always a constant working air gap between the armature and magnetic core of the solenoid is present ,
- a hollow valve needle can be rolled out of a metal sheet with at least two preferably punched-out recesses of limited axial length, wherein two recesses each diametrically opposed in the hollow valve needle form a slot.
- the parallel to the longitudinal edges extending joints of the sheet are materially connected to each other, eg welded.
- a hollow valve needle of two bent sheets are assembled, each having at least one parallel to the longitudinal edges of the sheet extending, preferably punched recess of limited axial length and are integrally connected to the abutting longitudinal edges together so that in turn two in the hollow valve needle each diametrically opposed recesses form a slot.
- a directed buckling or buckling of the Veformungsstege is determined and supported according to an advantageous embodiment of the invention by joints, which are incorporated at the slot ends and in the slot center of at least one slot in the valve needle and preferably formed by cross-sectional constrictions in the deformation webs.
- cross-sectional constrictions are realized in accordance with an advantageous embodiment of the invention by a respective inserted into the valve needle transverse bore at each of the two slot ends and introduced into the valve needle, circumferential groove in slot center, so buckle the deformation webs when exceeding the predetermined load, the so-called.
- Buckling load inside and support each other. The mutual support increases the rigidity of the valve needle in the pressure direction.
- the buckling of the deformation webs inward can also be achieved in that the deformation webs are pre-bent by plastic deformation from its extended position by a few degrees inwards.
- cross-sectional constrictions are realized according to an advantageous embodiment of the invention by a respective inserted into the valve needle, circumferential groove at the slot ends and introduced into the valve needle transverse bore in slot center, so buckle the deformation webs when exceeding the buckling load to the outside.
- the rigidity of the valve needle increases in the printing direction.
- the buckling of the deformation webs to the outside can also be promoted according to an alternative embodiment of the invention in that the deformation webs are pre-bent by plastic deformation from the extended position by a few degrees outwards.
- valve for metering fluid is used for example as an injection valve for injecting fuel in a fuel injection system of internal combustion engines.
- the valve has a sleeve-shaped valve housing 11, in whose literallyess workedes end a valve body 12 and in its inlet end a not shown here Connecting piece for connecting a fluid line for the fluid inlet 10 is used fluid-tight.
- the valve body 12 is materially connected to the valve housing 11, wherein the material connection is symbolized by the weld 13.
- a metering or valve opening 14 is formed with a valve seat 15 surrounding the valve opening 14.
- valve needle 16 has at its valve opening 14 facing, literallyess districten needle end on a closing body 161 which forms a sealing seat with the valve seat 15.
- the closing body 161 is here formed like a ball and welded to the front end of the here massive valve needle 16. However, the closing body 161 can also be designed in one piece with the valve needle 16.
- the sealing seat 16 is produced or canceled by actuating the valve needle 16.
- the valve needle 16 is loaded to produce the sealing seat by a return member 18 to pressure and to cancel the sealing seat of an actuator 19 to train.
- the return member 18 is formed as a compression spring 17 and the actuator 19 as an electromagnet 20.
- other actuators 19 may be used, for. B. a piezoelectric or magnetostrictive actuator.
- the compression spring 17 is supported on the one hand on the armature 24 and on the other hand on an adjustment sleeve 26 which is screwed into the magnetic core 23.
- flow channels 27 are held, which produce via the adjusting sleeve 26 a fluid connection from the inlet 10 to one of the valve opening 14 upstream, enclosed by the valve body 12 and the valve housing 11 valve chamber 28.
- the magnetic coil 22 is by means of an electric Connection plug 29 can be energized.
- the connecting piece for the fluid supply line and a connector housing 29 enclosing, not shown here plug housing are formed by a plastic casing which also at least partially surrounds the magnet pot 21 (not shown here).
- the valve needle 16 shown in the exemplary embodiments has different stiffnesses in the direction of tension and compression in such a way that the valve needle 16 is almost invariably stiff when loaded in the direction of pull, but under load in the direction of pressure a stiffness permitting elastic deformations until a predetermined load is reached has and on the other hand assumes an increased stiffness after the occurrence of deformations.
- the predetermined load hereinafter referred to as buckling load, is preferably selected to be smaller than the sum of the minimum allowable restoring or closing force of the pressure acting on the valve needle 16 return member 18, so the pressure force of the compression spring 17, and the minimum existing closing force, the Fluid is exerted on the valve needle 16 with closing body 161.
- valve needle 16 has at least one pair of diametrically opposed deformation webs 30 in at least one needle section, which on reaching the predetermined load, so the buckling load, elastically on or buckle.
- FIG. 5 are in a needle portion of the valve needle 16 has two pairs of diametrically opposed each deformation webs 30.
- FIG. 6 is in two axially successive needle portions of the valve needle 16 each have a pair of mutually opposite deformation webs 30 available.
- At least one slot 31 extending in the axial direction of the valve needle 16 with a limited slot length is introduced into the massive valve needle 16.
- the valve needle 16 has only one slot 31.
- valve needle 16 of the closing body 161 Due to the lower rigidity of the valve needle 16 of the closing body 161 remains after the first touch on the valve seat 15 in the valve seat 15, while the armature 24 due to the changing distance of the In the middle of the two deformation webs 30, so by "breathing" of the slot 31, can swing up and down and its energy dissipates by its movement in the fluid.
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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)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
Description
Die Erfindung geht aus von einem Ventil zum Zumessen von Fluid nach dem Oberbegriff des Anspruchs 1, wobei der für ein strömendes oder fließendes Medium stehende übergeordnete Begriff Fluid in Übereinstimmung mit der Strömungslehre für Gase und Flüssigkeiten verwendet wird.The invention is based on a valve for metering fluid according to the preamble of claim 1, wherein the standing for a flowing or flowing medium superordinate term fluid is used in accordance with the fluid flow theory for gases and liquids.
Bei einem bekannten Kraftstoffeinspritzventil (
Ein solches Ventil hat gegenüber einem Ventil mit starrer Verbindung von Anker und Ventilnadel den Vorteil, dass die bei Ventilbetätigung bewegte träge Masse auf zwei Teilmassen, nämlich auf Magnetanker und Ventilnadel mit Schließkörper, aufgeteilt ist, was zu einer Geräuschdämpfung beim Ventilöffnen und Ventilschließen führt. Darüber hinaus werden sog. Preller des Magnetankers durch die Vorhubfeder weitgehend gedämpft. Diese Preller führen beim Ventilschließen nach erstmaligem Aufsetzen des Schließkörpers auf den Ventilsitz zu erneutem Abheben des Schließkörpers vom Ventilsitz und damit zu einem unkontrollierten, kurzzeitigen Aufheben des Dichtsitzes und Öffnen des Ventils und damit zu einer nicht reproduzierbaren Zumessmenge von Fluid. Durch die Beweglichkeit des Magneten auf der Ventilnadel kann beim Ventilöffnen ein sog. mechanischer Boosteffekt dadurch erzielt, dass der Magnetanker bei Bestromung des Elektromagneten beschleunigt wird, bevor er nach Anschlagen an dem Mitnehmerflansch die Ventilnadel mitnimmt und den Schließkörper vom Ventilsitz abhebt. Durch den dabei stattfindenden Impulsaustausch zwischen Magnetanker und Ventilnadel wird insbesondere bei großem Fluiddruck die hydraulische Schließkraft am Schließkörper schnell überwunden. Der erforderliche Energiebedarf des Magneten ist damit geringer als bei Ventilen, bei denen Magnetanker und Ventilnadel starr miteinander verbunden sind.Such a valve has over a valve with rigid connection of armature and valve needle the advantage that the moving during valve actuated inertial mass is divided into two sub-masses, namely armature and valve needle with closing body, which leads to a noise reduction in valve opening and valve closing. In addition, so-called. Preller of the armature are largely attenuated by the Vorhubfeder. This Preller lead when valve closing after the first placement of the closing body on the valve seat to renewed lifting of the closing body from the valve seat and thus to an uncontrolled, momentary lifting of the sealing seat and opening the valve and thus to a non-reproducible Zumessmenge of fluid. Due to the mobility of the magnet on the valve needle, a so-called mechanical boost effect can be achieved during valve opening by accelerating the magnet armature when the electromagnet is energized, before lifting the valve needle after striking the driver flange and lifting the closing body from the valve seat. As a result of the momentum exchange between magnet armature and valve needle, the hydraulic closing force on the closing body is quickly overcome, especially in the case of high fluid pressure. The required energy requirement of the magnet is thus lower than in valves in which armature and valve needle are rigidly interconnected.
Weitere Ventile mit dem vorteilhaften sog. Ankerfreiweg sind aus
Aus der
Das erfindungsgemäße Zumessventil mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die Ausbildung der Ventilnadel mit unterschiedlichen Steifigkeiten in Zug- und Druckrichtung die Vorteile der Ventile mit sog. Ankerfreiweg, wie Vermeidung von Prellern und mechanischer Booster, erhalten bleiben, ohne die Nachteile, die mit diesen bekannten konstruktiven Ausführungen dieser Ventile einhergehen, wie eine Vielzahl von Bauteilen und Verbindungsstellen, hohe Fertigungskosten, Abhängigkeit von Fertigungstoleranzen und verwendetem Fluid durch vorhandene hydraulische Quetschspalte, aufzuweisen. Die Anzahl der Bauteile bei dem erfindungsgemäßen Ventil ist nicht größer als bei Ventilen mit starrer Verbindung von Aktor und Ventilnadel, und entsprechend vereinfacht ist der Montageprozess. Da weniger funktionsbestimmende Toleranzen einzuhalten sind, wird der Fertigungsaufwand und die Exemplarstreuung in den Funktionswerten, insbesondere bei der Mengenzumessung von Fluid, reduziert. Die Funktion des Ventils bleibt über die Laufzeit stabil. Die bei den bekannten Ventilen durch Vorhubfeder und Ankerfreiweg erzielten Vorteile, wie Dämpfung der Preller und mechanische Boosterung, werden durch die von der Rückstell- oder Schließkraft des Rückstellorgans ausgelöste elastische Verformung der Ventilnadel bei Aufsetzen des Schließkörpers auf den Ventilsitz und durch selbständiges Rückstellen der Verformung der Ventilnadel bei erfolgter Aufhebung der Rückstellkraft des Rückstellorgans durch den aktivierten Aktor erzielt. Durch die bis zu einer vorbestimmten Last geringe Steifigkeit der Ventilnadel werden Preller beim Ventilschließen vermieden, da der Schließkörper nach dem ersten Schließen des Ventils auf dem Ventilsitz verbleibt, während die träge Masse des Aktors aufgrund der Verformungen der Ventilnadel noch schwingen und dadurch ihre Energie abbauen kann. Ist der Aktor ein Elektromagnet mit einem im Fluid sich bewegenden Magnetanker, so wird durch die Bewegung des Magnetankers im Fluid weitere Energie abgebaut. Nach Eintreten der maximalen Verformung wird durch die nunmehr wieder höhere Steifigkeit der Ventilnadel der Schließkörper definiert auf dem Ventilsitz gehalten, so dass eine definierte Zuordnung von Aktor und Ventilnadel gewährleistet ist, so z.B. der Arbeitsluftspalt des Elektromagneten zwischen Magnetanker und Magnetkern bei geschlossenem Ventil unabhängig von Toleranzen des Rückstellorgans konstant ist.The metering valve according to the invention with the features of claim 1 has the advantage that the advantages of the valves with so-called. Ankerfreiweg, such as avoid bouncing and mechanical booster, preserved by the formation of the valve needle with different stiffness in tension and compression direction, without the disadvantages associated with these known structural designs of these valves, such as a variety of components and joints, high manufacturing costs, dependency on manufacturing tolerances and fluid used by existing hydraulic crimp, exhibit. The number of components in the valve according to the invention is not greater than for valves with a rigid connection Actuator and valve needle, and accordingly simplifies the assembly process. Since less function-determining tolerances are to be observed, the production costs and the sample spread in the functional values, in particular in the quantitative metering of fluid, are reduced. The function of the valve remains stable over the runtime. The advantages achieved in the known valves by Vorhubfeder and Ankerfreiweg, such as damping of the Preller and mechanical Boosterung are triggered by the return or closing force of the return member elastic deformation of the valve needle when placing the closing body on the valve seat and by independently resetting the deformation Valve needle scored by successful cancellation of the restoring force of the return actuator by the activated actuator. By up to a predetermined load low stiffness of the valve needle Preller are avoided when valve closing, since the closing body after the first closing of the valve remains on the valve seat, while the inertial mass of the actuator due to the deformations of the valve needle still swing and thereby reduce their energy , If the actuator is an electromagnet with a magnet armature moving in the fluid, further energy is dissipated by the movement of the magnet armature in the fluid. After the maximum deformation has occurred, the closure body is held in a defined manner on the valve seat by the now higher stiffness of the valve needle, so that a defined assignment of actuator and valve needle is ensured, for example the working air gap of the electromagnet between magnet armature and magnetic core with closed valve, independent of tolerances of the return member is constant.
Erfindungsgemäß weist die Ventilnadel in mindestens einem Nadelabschnitt mindestens ein Paar Verformungsstege auf, die einander diametral gegenüberliegen und bei Erreichen der vorbestimmten Last elastisch ein- oder ausknicken.According to the invention, the valve needle in at least one needle section on at least one pair of deformation webs which are diametrically opposite each other and elastically on reaching the predetermined load or buckle.
Die Verformungsstege werden in fertigungstechnisch dadurch gewonnen, dass in die massive oder hohle Ventilnadel in mindestens einem Nadelabschnitt mindestens ein in Achsrichtung der Ventilnadel sich erstreckender Schlitz mit begrenzter Schlitzlänge eingebracht wird.The deformation webs are obtained in manufacturing technology in that in the solid or hollow valve needle in at least one needle section at least one in the axial direction of the valve needle extending slot is introduced with a limited slot length.
Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Ventils möglich.The measures listed in the further claims advantageous refinements and improvements of the claim 1 valve are possible.
Gemäß einer vorteilhaften Ausführungsform der Erfindung ist die vorbestimmte Last, ab der elastische Verformungen der Ventilnadel auftreten, kleiner gewählt, als die Summe aus minimal zulässiger Rückstell- oder Schließkraft des in Druckrichtung auf die Ventilnadel wirkenden Rückstellorgans und einer minimal vorhandenen Schließkraft, die vom Fluid auf die Ventilnadel mit Schließkörper ausgeübt wird. Bei demgegenüber auf die Ventilnadel in Druckrichtung wirkenden größeren Schließkräften tritt die elastische Verformung der Ventilnadel ein. Damit ist die Anfangsposition des mit der Ventilnadel verbunden Aktors beim Ventilschließen, z.B. die Anfangsposition des Magnetankers eines Elektromagneten, unabhängig von der auf die Ventilnadel in Druckrichtung wirkenden Rückstellkraft des Rückstellorgans genau definiert. Durch die mit zunehmender Verformung sich erhöhende Steifigkeit der Ventilnadel wird der Schließkörper stärker auf dem Ventilsitz aufgepresst, so dass im Ruhezustand des geschlossenen Ventils eine definierte Zuordnung von Aktor und Ventilnadel gewährleistet ist, so z.B. stets ein konstanter Arbeitsluftspalt zwischen Magnetanker und Magnetkern des Elektromagneten vorhanden ist.According to an advantageous embodiment of the invention, the predetermined load from which elastic deformations of the valve needle occur, chosen smaller than the sum of the minimum allowable restoring or closing force acting in the pressure direction on the valve needle return member and a minimum existing closing force of the fluid the valve needle is exerted with closing body. In contrast, acting on the valve needle in the compression direction greater closing forces occurs elastic deformation of the valve needle one. Thus, the initial position of the actuator connected to the valve needle valve closing, for example, the initial position of the armature of an electromagnet, regardless of the force acting on the valve needle in the pressure direction restoring force of the return member is precisely defined. Due to the increasing deformation with increasing stiffness of the valve needle, the closing body is pressed more strongly on the valve seat, so that a defined assignment of actuator and valve needle is ensured in the idle state of the closed valve, such as always a constant working air gap between the armature and magnetic core of the solenoid is present ,
Zur Gewinnung der Verformungsstege kann eine hohle Ventilnadel aus einem Blech mit mindestens zwei vorzugsweise ausgestanzten Aussparungen von begrenzter Axiallänge gerollt werden, wobei zwei in der hohlen Ventilnadel jeweils einander diametral gegenüberliegenden Aussparungen einen Schlitz bilden. Vorzugsweise werden die parallel zu den Längskanten sich erstreckenden Stoßstellen des Blechs miteinander stoffschlüssig verbunden, z.B. verschweißt. Bei Verwendung eines Elektromagneten als Aktor wird vorteilhaft auf eine solche Verschweißung verzichtet und Schließkörper und Magnetanker des Elektromagneten auf die Stirnenden des gerollten Blechs aufgeschweißt. Auch kann zur Gewinnung der Verformungsstege eine hohle Ventilnadel aus zwei gebogenen Blechen zusammengesetzt werden, die jeweils mindestens eine parallel zu den Längskanten des Blechs sich erstreckende, vorzugsweise ausgestanzte Aussparung von begrenzter Axiallänge aufweisen und an den aneinanderstoßenden Längskanten miteinander stoffschlüssig verbunden sind, so dass wiederum zwei in der hohlen Ventilnadel jeweils einander diametral gegenüberliegende Aussparungen einen Schlitz bilden.To obtain the deformation webs, a hollow valve needle can be rolled out of a metal sheet with at least two preferably punched-out recesses of limited axial length, wherein two recesses each diametrically opposed in the hollow valve needle form a slot. Preferably, the parallel to the longitudinal edges extending joints of the sheet are materially connected to each other, eg welded. When using an electromagnet as an actuator is advantageously dispensed with such welding and welded closing body and armature of the electromagnet on the front ends of the rolled sheet. Also, to obtain the deformation webs, a hollow valve needle of two bent sheets are assembled, each having at least one parallel to the longitudinal edges of the sheet extending, preferably punched recess of limited axial length and are integrally connected to the abutting longitudinal edges together so that in turn two in the hollow valve needle each diametrically opposed recesses form a slot.
Ein gerichtetes Ein- oder Ausknicken der Veformungsstege wird gemäß einer vorteilhaften Ausführungsform der Erfindung durch Gelenkstellen bestimmt und unterstützt, die an den Schlitzenden und in Schlitzmitte des mindestens einen Schlitzes in die Ventilnadel eingearbeitet und vorzugsweise durch Querschnittsverengungen in den Verformungsstegen gebildet sind.A directed buckling or buckling of the Veformungsstege is determined and supported according to an advantageous embodiment of the invention by joints, which are incorporated at the slot ends and in the slot center of at least one slot in the valve needle and preferably formed by cross-sectional constrictions in the deformation webs.
Werden die Querschnittsverengungen gemäß einer vorteilhaften Ausführungsform der Erfindung durch je eine in die Ventilnadel eingebrachte Querbohrung an jedem der beiden Schlitzenden und durch eine in die Ventilnadel eingebrachte, umlaufende Nut in Schlitzmitte realisiert, so knicken die Verformungsstege bei Überschreiten der vorbestimmten Last, der sog. Knicklast, nach innen ein und stützen sich aneinander ab. Durch die gegenseitige Abstützung erhöht sich die Steifigkeit der Ventilnadel in Druckrichtung.If the cross-sectional constrictions are realized in accordance with an advantageous embodiment of the invention by a respective inserted into the valve needle transverse bore at each of the two slot ends and introduced into the valve needle, circumferential groove in slot center, so buckle the deformation webs when exceeding the predetermined load, the so-called. Buckling load , inside and support each other. The mutual support increases the rigidity of the valve needle in the pressure direction.
Das Einknicken der Verformungsstege nach innen kann gemäß einer alternativen Ausführungsform der Erfindung auch dadurch erzielt werden, dass die Verformungsstege durch plastische Verformung aus ihrer Strecklage um wenige Grade nach innen vorgebogen sind.The buckling of the deformation webs inward according to an alternative embodiment of the invention can also be achieved in that the deformation webs are pre-bent by plastic deformation from its extended position by a few degrees inwards.
Werden die Querschnittsverengungen gemäß einer vorteilhaften Ausführungsform der Erfindung durch je eine in die Ventilnadel eingebrachte, umlaufende Nut an den Schlitzenden und durch eine in die Ventilnadel eingebrachte Querbohrung in Schlitzmitte realisiert, so knickern die Verformungsstege bei Überschreiten der Knicklast nach außen aus. Bei Erreichen eines maximalen Abstands der Mitten der Verformungsstege voneinander, erhöht sich die Steifigkeit der Ventilnadel in Druckrichtung.If the cross-sectional constrictions are realized according to an advantageous embodiment of the invention by a respective inserted into the valve needle, circumferential groove at the slot ends and introduced into the valve needle transverse bore in slot center, so buckle the deformation webs when exceeding the buckling load to the outside. When reaching a maximum distance of the centers of the deformation webs from each other, the rigidity of the valve needle increases in the printing direction.
Das Ausknicken der Verformungsstege nach außen kann gemäß einer alternativen Ausführungsform der Erfindung auch dadurch gefördert werden, dass die Verformungsstege durch plastische Verformung aus der Strecklage um wenige Grade nach außen vorgebogen sind.The buckling of the deformation webs to the outside can also be promoted according to an alternative embodiment of the invention in that the deformation webs are pre-bent by plastic deformation from the extended position by a few degrees outwards.
Die Erfindung ist anhand von in den Zeichnungen dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
-
Figur 1 einen Längsschnitt eines Ventils zum Zumessen von Fluid im Betriebszustand "Ventil offen" mit einem Aktor und einem Rückstellorgan zur Betätigung einer Ventilnadel, -
Figur 2 eine schematisierte Darstellung von Ventilnadel, Aktor und Rückstellorgan bei geschlossenem Ventil im Ruhezustand (Figur 2A ), bei geschlossenem Ventil und aktiviertem Aktor (Figur 2B ) und bei geöffnetem Ventil und aktiviertem Aktor (Figur 2C ), -
Figur 3 einen Querschnitt der Ventilnadel gemäß Linie III - III inFigur 2C, Figur 4 eine gleiche Darstellung wie inFigur 3 eines weiteren Ausführungsbeispiels der Ventilnadel, -
Figur 5 eine gleiche Darstellung wie inFigur 3 eines weiteren Ausführungsbeispiels der Ventilnadel, -
Figur 6 eine gleiche Darstellung wie inFigur 2C gemäß einem weiteren Ausführungsbeispiel der Ventilnadel, -
Figur 7 eine gleiche Darstellung wie inFigur 2C gemäß einem weiteren Ausführungsbeispiel der Ventilnadel, -
Figur 8 eine gleiche Darstellung wie inFigur 2C gemäß einem weiteren Ausführungsbeispiel der Ventilnadel, -
Figur 9 die Ventilnadel gemäßFigur 8 bei geschlossenem Ventil in Ruhestellung.
-
FIG. 1 a longitudinal section of a valve for metering fluid in the operating state "valve open" with an actuator and a return member for actuating a valve needle, -
FIG. 2 a schematic representation of the valve needle, actuator and return member with the valve closed at rest (FIG. 2A ), with closed valve and activated actuator (FIG. 2B ) and with open valve and activated actuator (Figure 2C ) -
FIG. 3 a cross section of the valve needle according to line III - III inFIG. 2C, FIG. 4 a same representation as inFIG. 3 a further embodiment of the valve needle, -
FIG. 5 a same representation as inFIG. 3 a further embodiment of the valve needle, -
FIG. 6 a same representation as inFigure 2C according to a further embodiment of the valve needle, -
FIG. 7 a same representation as inFigure 2C according to a further embodiment of the valve needle, -
FIG. 8 a same representation as inFigure 2C according to a further embodiment of the valve needle, -
FIG. 9 the valve needle according toFIG. 8 when the valve is closed, at rest.
Das in
Der Elektromagnet 20 weist in bekannter Weise einen Magnettopf 21, eine Magnetspule 22, einen Magnetkern 23 und einen Magnetanker 24 auf. Der Magnettopf 21 ist auf das Ventilgehäuse 11 aufgeschoben und mit seinem Topfboden am Ventilgehäuse 11 verschweißt und nimmt die Magnetspule 22 axial unverschieblich auf. Der hohlzylindrische Magnetkern 23 ist formschlüssig in das Ventilgehäuse 11 eingesetzt und nimmt im hohlen Kerninnern die Druckfeder 17 auf. Der im Ventilgehäuse 11 axial verschieblich geführte Magentanker 24 ist starr auf der Ventilnadel 16 befestigt, z. B. mit dieser stoffschlüssig verbunden, was in
Mit verschiedenen, im Folgenden erläuterten konstruktiven Ausführungen der Ventilnadel 16 werden bei diesem Ventil zwei Vorteile erzielt, die auch Ventile mit Vorhubfeder und Ankerfreiweg aufweisen, die aber in Fertigung und Montage deutlich aufwendiger sind. Der eine Vorteil ist die weitgehende Eliminierung der Preller beim Schließen der Ventilöffnung 14, also beim Herstellen des Dichtsitzes, wodurch der Schließkörper nach seinem ersten Aufsetzen auf den Ventilsitz auf diesem verbleibt und durch Aufrechterhaltung des Dichtsitzes eine reproduzierbare Zumessung von Fluid sicherstellt. Der andere Vorteil ist die Gewinnung eines sog. Boosteffekts, d. h. einer kurzzeitigen Beschleunigung des Magnetankers 24 beim Ventilöffnen, was zu einer Verringerung der erforderlichen Magnetkraft beim Aufheben des Dichtsitzes führt und eine Reduzierung der Leistung des Elektromagneten 20 ermöglicht. Die in den Ausführungsbeispielen gezeigte Ventilnadel 16 weist hierzu in Zug- und Druckrichtung unterschiedliche Steifigkeiten in der Weise auf, dass die Ventilnadel 16 bei Belastung in Zugrichtung quasi unverformbar steif ist, bei Belastung in Druckrichtung jedoch eine bis zum Erreichen einer vorbestimmten Last elastische Verformungen zulassende Steifigkeit aufweist und nach Eintreten der Verformungen eine demgegenüber vergrößerte Steifigkeit annimmt. Die vorbestimmte Last, im Folgenden als Knicklast bezeichnet, ist vorzugsweise kleiner gewählt als die Summe aus minimal zulässiger Rückstell- oder Schließkraft des in Druckrichtung auf die Ventilnadel 16 wirkenden Rückstellorgans 18, also der Druckkraft der Druckfeder 17, und der minimal vorhandenen Schließkraft, die vom Fluid auf die Ventilnadel 16 mit Schließkörper 161 ausgeübt wird. Diese unterschiedlichen Steifigkeiten werden in konstruktiv einfacher Weise dadurch erreicht, dass die Ventilnadel 16 in mindestens einem Nadelabschnitt mindestens ein Paar einander diametral gegenüberliegende Verformungsstege 30 aufweist, die bei Erreichen der vorbestimmten Last, also der Knicklast, elastisch ein- oder ausknicken.With different, explained below constructive embodiments of the
Im Ausführungsbeispiel der
Zur Gewinnung dieser Verformungsstege 30 ist in die massive Ventilnadel 16 mindestens ein sich in Achsrichtung der Ventilnadel 16 erstreckender Schlitz 31 mit begrenzter Schlitzlänge eingebracht. In dem Ausführungsbeispiel der
Anstelle der massiven Ventilnadel 16 gemäß
In
In
In
Die sog. Preller mit unkontrolliertem, kurzzeitigem Aufheben des Dichtsitzes werden vermieden.The so-called. Preller with uncontrolled, temporary lifting of the sealing seat are avoided.
Wird in der Ventilschließstellung nunmehr der Elektromagnet 20 bestromt, wie dies in
Das Einknicken der Verformungsstege 30 gemäß
Alternativ können die Verformungsstege 30 bei Belastung in Druckrichtung und Überschreiten der Knicklast auch nach außen ausknicken, wobei sich die Mitten der Verformungsstege 30 voneinander wegbewegen. Eine solche Ausknickung kann z.B. dadurch erreicht werden, dass die Verformungsstege 30 durch plastische Verformung aus der Strecklage um wenige Grade nach außen vorgebogen werden.Alternatively, the
Um ein definiertes, gerichtetes Ein- oder Ausknicken der Verformungsstege 30 zu gewährleisten, sind an den beiden Schlitzenden und in Schlitzmitte eines jeden Schlitzes 31 Gelenkstellen in die Ventilnadel 16 eingearbeitet, die durch Querschnittsverengungen 32 in den Verformungsstegen 30, also durch eine Reduzierung des Querschnitts des Verformungsstegmaterials, erzielt werden. Im Ausführungsbeispiel der Ventilnadel 16 gemäß
In dem Ausführungsbeispiel der Ventilnadel 16 gemäß
Claims (11)
- Valve for metering fluid, having a valve opening (14) through which the fluid can flow and which is surrounded by a valve seat (15), having a valve needle (16) which, to form a sealing seat at the valve opening (14), has a closing body (161) which interacts with the valve seat (15), having a restoring element (18) which exerts compression load on the valve needle (16) in order to produce the sealing seat, and having an actuator (19) which exerts tension load on the valve needle (16) in order to eliminate the sealing seat, wherein the valve needle (16) has different stiffnesses in the tension and compression directions, in such a way that the valve needle (16), when subjected to load in the tension direction, is virtually non-deformably rigid and, when subjected to load in the compression direction, has a stiffness permitting elastic deformations until a predetermined load is reached and takes on a relatively increased stiffness after onset of the deformations, characterized in that the valve needle (16) has, in at least one needle section, at least one pair of deformation webs (30) which can elastically buckle inward or outward when the predetermined load is reached and which are situated diametrically opposite one another, and in that, to realize the deformation webs (30), the solid or hollow valve needle (16) has formed into it, in at least one needle section, at least one slot (31) which extends in an axial direction of the valve needle (16) and which has a limited slot length.
- Valve according to Claim 1, characterized in that the predetermined load is lower than the sum of a minimum admissible restoring force of the restoring element (18), acting on the valve needle (16) in the compression direction, and of a minimum acting closing force, exerted by the fluid on the valve needle (16) with closing body (161).
- Valve according to Claim 1 or 2, characterized in that, to realize the deformation webs (30), the valve needle (16) is rolled from a metal sheet with at least two cutouts of limited axial length, and preferably in that the joint faces, extending parallel to the longitudinal edges of the recesses, of the metal sheet are welded to one another.
- Valve according to Claim 1 or 2, characterized in that, to realize the deformation webs (30), the valve needle (16) is assembled from two curved metal sheets which each have at least one recess of limited axial length extending parallel to the longitudinal edges of the metal sheet and which are welded to one another at the longitudinal edges that abut against one another.
- Valve according to one of Claims 1 to 4, characterized in that, at the two slot ends and in the slot centre of the at least one slot (31), articulation points which assist the elastic buckling of the deformation webs (30) are formed into the valve needle (16).
- Valve according to Claim 5, characterized in that the articulation points are formed by cross-sectional constrictions (32) in the deformation webs (30).
- Valve according to Claim 6, characterized in that the cross-sectional constriction (32) at each of the two slot ends is realized by way of a transverse bore (33) formed into the valve needle (16), and the cross-sectional constriction (32) in the slot centre is realized by way of an encircling groove (34) formed into the valve needle (16).
- Valve according to Claim 6, characterized in that the cross-sectional constriction (32) at each of the two slot ends is realized by way of an encircling groove (34) formed into the valve needle (16), and the cross-sectional constriction (32) in the slot centre is realized by way of a transverse bore (33) formed into the valve needle (16).
- Valve according to Claim 1, characterized in that the deformation webs (30) are bent inward or outward from their axial extent by a few degrees by plastic deformation.
- Valve according to one of Claims 1 to 9, characterized in that the actuator (19) is formed by an electromagnet (20) with a magnet armature (24), and the magnet armature (24) is seated fixedly on, preferably cohesively connected to, the valve needle (16).
- Valve according to Claim 10, characterized in that, to realize the deformation webs (30), the valve needle (16) is rolled from a metal sheet with at least two recesses of limited axial length, and magnet armature (24) and closing body (161) are cohesively mounted, preferably welded, onto the rolled metal sheet.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012208136A DE102012208136A1 (en) | 2012-05-15 | 2012-05-15 | Valve for metering fluid |
Publications (2)
Publication Number | Publication Date |
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EP2664779A1 EP2664779A1 (en) | 2013-11-20 |
EP2664779B1 true EP2664779B1 (en) | 2016-01-20 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13160890.3A Active EP2664779B1 (en) | 2012-05-15 | 2013-03-25 | Valve for metering out fluid |
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EP (1) | EP2664779B1 (en) |
DE (1) | DE102012208136A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014226407A1 (en) | 2014-12-18 | 2016-06-23 | Robert Bosch Gmbh | Injector for fuels |
DE102015211667A1 (en) * | 2015-06-24 | 2016-12-29 | Robert Bosch Gmbh | Valve for metering a fluid |
DE102015212467A1 (en) * | 2015-07-03 | 2017-01-05 | Robert Bosch Gmbh | Injection nozzle for a fuel injection system |
DE102016225939A1 (en) | 2016-12-22 | 2018-06-28 | Robert Bosch Gmbh | Electromagnetically actuated valve and method for producing a valve needle for an electromagnetically operable valve |
DE102017116214A1 (en) * | 2017-07-18 | 2019-01-24 | L'orange Gmbh | Nozzle needle for a fuel injector, fuel injector and injection system for an internal combustion engine |
JPWO2021090388A1 (en) * | 2019-11-06 | 2021-05-14 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5636827A (en) * | 1994-09-20 | 1997-06-10 | Siemens Automotive Corporation | Notched needle bounce eliminator |
DE19849210A1 (en) | 1998-10-26 | 2000-04-27 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engine fuel injection system has armature movable between two stops, damping spring arranged between second stop and armature |
DE19932763A1 (en) | 1999-07-14 | 2001-01-18 | Bosch Gmbh Robert | Fuel injector |
DE19946602A1 (en) | 1999-09-29 | 2001-04-12 | Bosch Gmbh Robert | Fuel injector |
DE10108945A1 (en) | 2001-02-24 | 2002-09-05 | Bosch Gmbh Robert | Fuel injector |
DE102011078732A1 (en) * | 2011-07-06 | 2013-01-10 | Robert Bosch Gmbh | Device for injecting fuel, has valve needle and valve housing with valve seat, where valve needle closes aperture in valve seat, and valve needle has area with reduced rigidity |
-
2012
- 2012-05-15 DE DE102012208136A patent/DE102012208136A1/en not_active Withdrawn
-
2013
- 2013-03-25 EP EP13160890.3A patent/EP2664779B1/en active Active
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EP2664779A1 (en) | 2013-11-20 |
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