EP1880101B1 - Valve, in particular fuel injection valve - Google Patents

Valve, in particular fuel injection valve Download PDF

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Publication number
EP1880101B1
EP1880101B1 EP06725242A EP06725242A EP1880101B1 EP 1880101 B1 EP1880101 B1 EP 1880101B1 EP 06725242 A EP06725242 A EP 06725242A EP 06725242 A EP06725242 A EP 06725242A EP 1880101 B1 EP1880101 B1 EP 1880101B1
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EP
European Patent Office
Prior art keywords
valve
transition
coating
valve element
sealing surface
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EP06725242A
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German (de)
French (fr)
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EP1880101A1 (en
Inventor
Werner Teschner
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1880101A1 publication Critical patent/EP1880101A1/en
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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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9038—Coatings

Definitions

  • the invention is based on a valve, as, for example, in the published patent application DE 100 38 954 A1 is shown.
  • a valve which is preferably designed as a fuel injection valve, has a housing in which a valve element is movably arranged.
  • the valve member has various faces that are subject to repeated sliding or impact loading during operation of the valve. At least some of these sub-surfaces are provided with a wear-reducing coating which reduces the wear caused by the sliding or impact movement and thus improves the life of the fuel injection valve.
  • the detachment of the coating preferably begins where a sharp edge is formed on the edge of the coated partial surface or within the coated partial surface. Once initiated, the coating stripping process continues over the life of the valve until the wear-reducing effect is severely compromised, which can significantly shorten the life of the valve.
  • valves are known, in particular of fuel injection valves. That's how it shows DE 101 33 433 Coatings, in particular diamond-like coatings, both of the valve element and the cooperating with the valve element surfaces in the housing, so the valve seat.
  • an injection valve is known in which the valve element has a coating which reduces wear.
  • the coating here comprises the entire surface of the valve member including the valve sealing surface which cooperates with the valve seat.
  • Another example is the DE 10313225 ,
  • the valve according to the invention has the advantage that the life is extended compared to a conventionally coated valve element and that the coating is maintained on the correspondingly mechanically stressed partial surfaces of the valve element over the entire life of the valve.
  • the flaking off of the coating in this area can be reliably prevented, which allows the coating as a whole to adhere reliably to the coated partial surfaces.
  • the coated part surface is formed as a substantially conical valve sealing surface which cooperates with a valve seat which is formed in the housing.
  • the valve element moves in its longitudinal direction so that an impact load occurs between the valve sealing surface and the valve seat when the flow of fuel to the injection ports is controlled by the longitudinal movement of the valve element.
  • an annular groove is formed, which at the transition to the valve sealing surface, a first and a second transition edge having. These transition edges are rounded, so that the wear-reducing coating adheres reliably to the entire valve sealing surface and in particular in the region of the transition edges.
  • the rounding of the edges is done with a radius in the range of 100 .mu.m to 150 .mu.m, in particular in the region of the valve sealing surface of a valve element.
  • FIG. 1 is a valve according to the invention, which is shown here as a fuel injection valve, shown in longitudinal section.
  • the valve has a housing 1, in a hole 3 is formed.
  • the bore 3 is delimited at its combustion-chamber-side end by a substantially conical valve seat 9, from which a plurality of injection openings 11 emanate which, in the installation position of the valve, open into a combustion chamber of the corresponding internal combustion engine.
  • a piston-shaped valve element 5 is arranged, which has a guide portion 15, with which the valve element 5 is guided in a corresponding bore portion 23 of the bore 3.
  • the valve element 5 tapers from the guide section 15 to form a pressure shoulder 13 and merges into a shaft region 25 which extends as far as a substantially conical valve sealing surface 7.
  • the valve sealing surface 7 forms a partial surface of the valve element 5, with which the valve element 5 cooperates with the conical valve seat 9.
  • the bore 3 is radially expanded, so that a pressure chamber 19 is formed, which continues the valve element 5 surrounding to the valve seat 9.
  • the pressure chamber 19 opens a running in the housing 1 inlet channel 27, via which the pressure chamber 19 can be filled with fuel under high pressure.
  • the valve element 5 is acted upon at its end remote from the valve seat by a closing force, which can be generated, for example, hydraulically or by a spring element, wherein the corresponding devices are not shown in the drawing. If fuel is introduced into the pressure chamber 19 under pressure, then a hydraulic force results on the pressure shoulder 13 and on parts of the valve sealing surface 7, whereby an axial opening force is exerted on the valve element 5, which is directed away from the valve seat 9 and thus the closing force is opposite.
  • a closing force which can be generated, for example, hydraulically or by a spring element, wherein the corresponding devices are not shown in the drawing.
  • valve element 5 moves away from the valve seat 9 and the injection openings 11 free or it moves into contact with the valve seat 9 and thus closes the injection openings 11 with respect to the pressure chamber 19th Whether the control ultimately by the Closing force or by a variable pressure in the pressure chamber 19, depends on the type of valve. Valves of this type are preferably used in self-igniting internal combustion engines.
  • FIG. 2 is the section of II FIG. 1 shown enlarged.
  • the valve sealing surface 7 has a first conical surface 32 and a second conical surface 34, which are separated from each other by an annular groove 30, wherein the annular groove 30 has a width d.
  • a first transition edge 36 is formed, and at the transition of the annular groove 30 to the second conical surface 34, a second transition edge 38.
  • the opening angle of the first conical surface 32 is smaller than the opening angle of the conical valve seat 9 during the Opening angle of the second conical surface 34 is greater than that of the valve seat 9.
  • the valve sealing surface 7 is provided with a coating 40 which has a wear-reducing effect and which is formed, for example, as a diamond-like layer, that is to say a so-called diamond-like-carbon layer (DLC layer).
  • a coating 40 which has a wear-reducing effect and which is formed, for example, as a diamond-like layer, that is to say a so-called diamond-like-carbon layer (DLC layer).
  • DLC layer diamond-like-carbon layer
  • the first transition edge 36 and the second transition edge 38 are each rounded, for example. With a radius R, as in FIG. 2 is indicated.
  • the rounding radius R is in this case in the range of 100 microns to 150 microns.
  • the width d of the annular groove 30 is preferably in the range of about 500 microns, so that a soft, steady transition from the first cone surface 32 to the annular groove 30 and from this to the second cone surfaces 34 is given.
  • a third transition edge 39 which is formed at the transition of the first conical surface 32 to the shaft region 25 of the valve element 5, also with a radius R to round.
  • a different rounding which does not exactly correspond to a circle segment with radius R, but in cross section has a different shape, in which case it is important that a sharp edge is avoided.
  • valve element 5 with a wear-reducing coating 40 over its entire surface, because it may be more cost-effective to provide the entire valve element 5 with a DLC layer and not just partial surfaces thereof.
  • the rounding radius R or the other rounding form does not have to be the same on all edges. It is also possible to provide different rounding radii, which are adapted to the circumstances in each case.
  • the coating of a valve element 5, which in this case has the shape of a piston-shaped valve needle the coating can also be applied to any other movable part of a valve, in which case the edges are rounded accordingly.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A valve, preferably a fuel injection valve for internal combustion engines, comprises a housing (1) in which is arranged a movable valve element (5) whose surface has at least one section (7; 15) provided with a wear-reducing coating (40). The coated surface section (7; 15) is exposed during operation of the valve to repeated friction or impact stresses, a rounded edge (36; 38; 39) being formed inside and/or at the border of the coated partial surface (7; 15).

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Ventil aus, wie es bspw. in der Offenlegungsschrift DE 100 38 954 A1 gezeigt ist. Ein solches Ventil, das vorzugsweise als Kraftstoffeinspritzventil ausgebildet ist, weist ein Gehäuse auf, in dem ein Ventilelement beweglich angeordnet ist. Das Ventilelement weist verschiedene Teilflächen auf, die im Betrieb des Ventils wiederholten Gleit- oder Aufprallbelastungen ausgesetzt sind. Zumindest einige dieser Teilflächen sind mit einer verschleißmindernden Beschichtung versehen, die den Verschleiß, der durch die Gleit- oder Aufprallbewegung entsteht, mindert und so die Lebensdauer des Kraftstoffeinspritzventils verbessert.The invention is based on a valve, as, for example, in the published patent application DE 100 38 954 A1 is shown. Such a valve, which is preferably designed as a fuel injection valve, has a housing in which a valve element is movably arranged. The valve member has various faces that are subject to repeated sliding or impact loading during operation of the valve. At least some of these sub-surfaces are provided with a wear-reducing coating which reduces the wear caused by the sliding or impact movement and thus improves the life of the fuel injection valve.

Nähere Untersuchungen dieser Teilflächen haben ergeben, dass es zu Ablösungen dieser Beschichtung kommen kann. Die Ablösung der Beschichtung beginnt vorzugsweise dort, wo am Rand der beschichten Teilfläche oder innerhalb der beschichteten Teilfläche eine scharfe Kante ausgebildet ist. Ein einmal begonnener Ablösungsprozess der Beschichtung setzt sich im Laufe der Lebensdauer des Ventils fort, bis die verschleißmindernde Wirkung stark beeinträchtigt ist, was die Lebensdauer des Ventils beträchtlich verkürzen kann.Closer examinations of these partial surfaces have shown that it can lead to detachment of this coating. The detachment of the coating preferably begins where a sharp edge is formed on the edge of the coated partial surface or within the coated partial surface. Once initiated, the coating stripping process continues over the life of the valve until the wear-reducing effect is severely compromised, which can significantly shorten the life of the valve.

- Aus dem Stand der Technik sind verschiedene Beschichtungen von Ventilen bekannt, insbesondere von Kraftstoffeinspritzventilen. So zeigt die DE 101 33 433 Beschichtungen, insbesondere auch diamantartige Beschichtungen, sowohl des Ventilelements als auch der mit dem Ventilelement zusammenwirkenden Flächen im Gehäuse, also des Ventilsitzes. Auch aus der Schrift WO 01/61182 ist ein Einspritzventil bekannt, bei dem das Ventilelement eine Beschichtung aufweist, die verschleißmindernd wirkt. Die Beschichtung umfasst hier die gesamte Oberfläche des Ventilelements einschließlich der Ventildichtfläche, die mit dem Ventilsitz zusammenwirkt. Ein anderes Beispiel ist die DE 10313225 .- From the prior art, various coatings of valves are known, in particular of fuel injection valves. That's how it shows DE 101 33 433 Coatings, in particular diamond-like coatings, both of the valve element and the cooperating with the valve element surfaces in the housing, so the valve seat. Also from the Scriptures WO 01/61182 an injection valve is known in which the valve element has a coating which reduces wear. The coating here comprises the entire surface of the valve member including the valve sealing surface which cooperates with the valve seat. Another example is the DE 10313225 ,

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Ventil weist demgegenüber den Vorteil auf, dass die Lebensdauer gegenüber einem herkömmlich beschichteten Ventilelement verlängert ist und dass die Beschichtung auf den entsprechend mechanisch beanspruchten Teilflächen des Ventilelements über die gesamte Lebensdauer des Ventils erhalten bleibt. Hierzu sind Kanten, die innerhalb der beschichteten Teilflächen oder am Rand der beschichteten Teilflächen ausgebildet sind, gerundet ausgebildet. Dadurch kann das Abplatzen der Beschichtung in diesem Bereich zuverlässig verhindert werden, was die Beschichtung insgesamt zuverlässig auf den beschichteten Teilflächen haften lässt.The valve according to the invention has the advantage that the life is extended compared to a conventionally coated valve element and that the coating is maintained on the correspondingly mechanically stressed partial surfaces of the valve element over the entire life of the valve. For this purpose, edges which are formed within the coated partial surfaces or at the edge of the coated partial surfaces, formed rounded. As a result, the flaking off of the coating in this area can be reliably prevented, which allows the coating as a whole to adhere reliably to the coated partial surfaces.

Die beschichtete Teilfläche ist als im wesentlichen konische Ventildichtfläche ausgebildet, die mit einem Ventilsitz zusammenwirkt, der im Gehäuse ausgebildet ist. Das Ventilelement bewegt sich in seiner Längsrichtung, so dass es zwischen der Ventildichtfläche und dem Ventilsitz zu einer Aufprallbelastung kommt, wenn der Kraftstoffstrom zu den Einspritzöffnungen durch die Längsbewegung des Ventilelements gesteuert wird. An der Ventildichtfläche ist eine Ringnut ausgebildet, die am Übergang zur Ventildichtfläche eine erste und eine zweite Übergangskante aufweist. Diese Übergangskanten sind gerundet ausgebildet, sodass die verschleißmindernde Beschichtung auf der gesamten Ventildichtfläche und insbesondere im Bereich der Übergangskanten zuverlässig haftet.The coated part surface is formed as a substantially conical valve sealing surface which cooperates with a valve seat which is formed in the housing. The valve element moves in its longitudinal direction so that an impact load occurs between the valve sealing surface and the valve seat when the flow of fuel to the injection ports is controlled by the longitudinal movement of the valve element. At the valve sealing surface, an annular groove is formed, which at the transition to the valve sealing surface, a first and a second transition edge having. These transition edges are rounded, so that the wear-reducing coating adheres reliably to the entire valve sealing surface and in particular in the region of the transition edges.

Die Verrundung der Kanten geschieht mit einem Radius, der im Bereich von 100 µm bis 150 µm, insbesondere im Bereich der Ventildichtfläche eines Ventilelements.The rounding of the edges is done with a radius in the range of 100 .mu.m to 150 .mu.m, in particular in the region of the valve sealing surface of a valve element.

Weitere Vorteile und vorteilhafte Ausgestaltungen sind der Beschreibung und der Zeichnung entnehmbar.Further advantages and advantageous embodiments of the description and the drawing can be removed.

Zeichnungdrawing

In der Zeichnung ist ein Ausführungsbeispiel eines erfindungsgemäßen Ventils dargestellt. Es zeigt

Figur 1
einen Schnitt durch ein Ventil, das hier als Kraftstoffeinspritzventil dargestellt ist, und
Figur 2
eine vergrößerte Darstellung des mit II bezeichneten Bereichs von Figur 1.
In the drawing, an embodiment of a valve according to the invention is shown. It shows
FIG. 1
a section through a valve, which is shown here as a fuel injection valve, and
FIG. 2
an enlarged view of designated II area of FIG. 1 ,

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist ein erfindungsgemäßes Ventil, das hier als Kraftstoffeinspritzventil dargestellt ist, im Längsschnitt dargestellt. Das Ventil weist ein Gehäuse 1 auf, in dem eine Bohrung 3 ausgebildet ist. Die Bohrung 3 wird an ihrem brennraumseitigen Ende von einem im wesentlichen konischen Ventilsitz 9 begrenzt, von dem mehrere Einspritzöffnungen 11 ausgehen, die in Einbaulage des Ventils in einen Brennraum der entsprechenden Brennkraftmaschine münden. In der Bohrung 3 ist ein kolbenförmiges Ventilelement 5 angeordnet, die einen Führungsabschnitt 15 aufweist, mit der das Ventilelement 5 in einem entsprechenden Bohrungsabschnitt 23 der Bohrung 3 geführt ist. Das Ventilelement 5 verjüngt sich ausgehend vom Führungsabschnitt 15 unter Bildung einer Druckschulter 13 und geht in einen Schaftbereich 25 über, der sich bis zu einer im wesentlichen konischen Ventildichtfläche 7 erstreckt. Die Ventildichtfläche 7 bildet eine Teilfläche des Ventilelements 5, mit der das Ventilelement 5 mit dem konischen Ventilsitz 9 zusammenwirkt. Auf Höhe der Druckschulter 13 ist die Bohrung 3 radial erweitert, so dass ein Druckraum 19 gebildet wird, der sich das Ventilelement 5 umgebend bis zum Ventilsitz 9 fortsetzt. In die radiale Erweiterung des Druckraums 19 mündet ein im Gehäuse 1 verlaufender Zulaufkanal 27, über den der Druckraum 19 mit Kraftstoff unter hohem Druck befüllbar ist.In FIG. 1 is a valve according to the invention, which is shown here as a fuel injection valve, shown in longitudinal section. The valve has a housing 1, in a hole 3 is formed. The bore 3 is delimited at its combustion-chamber-side end by a substantially conical valve seat 9, from which a plurality of injection openings 11 emanate which, in the installation position of the valve, open into a combustion chamber of the corresponding internal combustion engine. In the bore 3, a piston-shaped valve element 5 is arranged, which has a guide portion 15, with which the valve element 5 is guided in a corresponding bore portion 23 of the bore 3. The valve element 5 tapers from the guide section 15 to form a pressure shoulder 13 and merges into a shaft region 25 which extends as far as a substantially conical valve sealing surface 7. The valve sealing surface 7 forms a partial surface of the valve element 5, with which the valve element 5 cooperates with the conical valve seat 9. At the level of the pressure shoulder 13, the bore 3 is radially expanded, so that a pressure chamber 19 is formed, which continues the valve element 5 surrounding to the valve seat 9. In the radial extension of the pressure chamber 19 opens a running in the housing 1 inlet channel 27, via which the pressure chamber 19 can be filled with fuel under high pressure.

Das Ventilelement 5 wird an seinem ventilsitzabgewandten Ende von einer Schließkraft beaufschlagt, die bspw. hydraulisch oder durch ein Federelement erzeugt werden kann, wobei die entsprechenden Vorrichtungen in der Zeichnung nicht dargestellt sind. Wird Kraftstoff in den Druckraum 19 unter Druck eingeleitet, so ergibt sich eine hydraulische Kraft auf die Druckschulter 13 und auf Teile der Ventildichtfläche 7, wodurch eine axiale Öffnungskraft auf das Ventilelement 5 ausgeübt wird, welche vom Ventilsitz 9 weggerichtet und damit der Schließkraft entgegengerichtet ist. Je nach Verhältnis von Schließkraft und hydraulischer Öffnungskraft bewegt sich das Ventilelement 5 vom Ventilsitz 9 weg und gibt die Einspritzöffnungen 11 frei oder sie bewegt sich in Anlage an den Ventilsitz 9 und verschließt so die Einspritzöffnungen 11 gegenüber dem Druckraum 19. Ob die Steuerung letztendlich durch die Schließkraft oder durch einen veränderlichen Druck im Druckraum 19 erfolgt, hängt vom Typ des Ventils ab. Ventile dieser Art kommen vorzugsweise in selbstzündenden Brennkraftmaschinen zum Einsatz.The valve element 5 is acted upon at its end remote from the valve seat by a closing force, which can be generated, for example, hydraulically or by a spring element, wherein the corresponding devices are not shown in the drawing. If fuel is introduced into the pressure chamber 19 under pressure, then a hydraulic force results on the pressure shoulder 13 and on parts of the valve sealing surface 7, whereby an axial opening force is exerted on the valve element 5, which is directed away from the valve seat 9 and thus the closing force is opposite. Depending on the ratio of closing force and hydraulic opening force, the valve element 5 moves away from the valve seat 9 and the injection openings 11 free or it moves into contact with the valve seat 9 and thus closes the injection openings 11 with respect to the pressure chamber 19th Whether the control ultimately by the Closing force or by a variable pressure in the pressure chamber 19, depends on the type of valve. Valves of this type are preferably used in self-igniting internal combustion engines.

In Figur 2 ist der mit II bezeichneten Ausschnitt von Figur 1 vergrößert dargestellt. Die Ventildichtfläche 7 weist eine erste Konusfläche 32 und eine zweite Konusfläche 34 auf, die durch eine Ringnut 30 voneinander getrennt sind, wobei die Ringnut 30 eine Breite d aufweist. Am Übergang der ersten Konusfläche 32 zur Ringnut 30 ist eine erste Übergangskante 36 ausgebildet, und am Übergang der Ringnut 30 zur zweiten Konusfläche 34 eine zweite Übergangskante 38. Der Öffnungswinkel der ersten Konusfläche 32 ist hierbei kleiner als der Öffnungswinkel des konischen Ventilsitzes 9, während der Öffnungswinkel der zweiten Konusfläche 34 größer ist als der des Ventilsitzes 9. Durch diese Ausgestaltung der Konusflächen 32, 34 kommt das Ventilelement 5 in seiner Schließstellung mit der ersten Übergangskante 36 am Ventilsitz 9 zur Anlage. Die erste Übergangskante 36 bildet damit eine Dichtkante, an der eine hohe Flächenpressung herrscht, damit die Einspritzöffnungen 11 auch bei hohem Druck im Druckraum 19 sicher abgedichtet werden.In FIG. 2 is the section of II FIG. 1 shown enlarged. The valve sealing surface 7 has a first conical surface 32 and a second conical surface 34, which are separated from each other by an annular groove 30, wherein the annular groove 30 has a width d. At the transition of the first conical surface 32 to the annular groove 30, a first transition edge 36 is formed, and at the transition of the annular groove 30 to the second conical surface 34, a second transition edge 38. The opening angle of the first conical surface 32 is smaller than the opening angle of the conical valve seat 9 during the Opening angle of the second conical surface 34 is greater than that of the valve seat 9. By this configuration of the conical surfaces 32, 34 comes the valve element 5 in its closed position with the first transition edge 36 on the valve seat 9 to the plant. The first transition edge 36 thus forms a sealing edge on which a high surface pressure prevails, so that the injection openings 11 are securely sealed even at high pressure in the pressure chamber 19.

Die Ventildichtfläche 7 ist mit einer Beschichtung 40 versehen, die eine verschleißmindemde Wirkung hat und die z.B. als diamantartige Schicht ausgebildet ist, also eine sogenannte Diamond-Like-Carbon-Schicht (DLC-Schicht). In Fig. 2 ist das Ventilelement 5 in der linken Bildhälfte teilweise geschnitten dargestellt, so dass die Beschichtung 40 sichtbar wird. Die Beschichtung 40 ist hier der Deutlichkeit halber stark überhöht dargestellt: Die Dicke beträgt in der Regel einige Zehntel bis hin zu wenigen Mikrometern.The valve sealing surface 7 is provided with a coating 40 which has a wear-reducing effect and which is formed, for example, as a diamond-like layer, that is to say a so-called diamond-like-carbon layer (DLC layer). In Fig. 2 the valve element 5 is shown partially cut in the left half of the picture, so that the coating 40 is visible. The coating 40 is shown greatly exaggerated here for the sake of clarity: The thickness is usually a few tenths down to a few micrometers.

Die erste Übergangskante 36 und die zweite Übergangskante 38 sind jeweils gerundet ausgebildet, bspw. mit einem Radius R, wie es in Figur 2 angedeutet ist. Der Rundungsradius R liegt hierbei im Bereich von 100 µm bis 150 µm. Die Breite d der Ringnut 30 ist hierbei vorzugsweise im Bereich von etwa 500 µm, sodass ein weicher, stetiger Übergang von der ersten Konusfläche 32 zur Ringnut 30 und von dieser zur zweiten Konusflächen 34 gegeben ist.The first transition edge 36 and the second transition edge 38 are each rounded, for example. With a radius R, as in FIG. 2 is indicated. The rounding radius R is in this case in the range of 100 microns to 150 microns. The width d of the annular groove 30 is preferably in the range of about 500 microns, so that a soft, steady transition from the first cone surface 32 to the annular groove 30 and from this to the second cone surfaces 34 is given.

Es kann auch vorgesehen sein, eine dritte Übergangskante 39, die am Übergang der ersten Konusfläche 32 zum Schaftbereich 25 des Ventilelements 5 ausgebildet ist, ebenfalls mit einem Radius R zu runden. Es ist jedoch auch eine andere Rundung möglich, die nicht genau einem Kreissegment mit Radius R entspricht, sondern im Querschnitt eine andere Form aufweist, wobei in jedem Fall wichtig ist, dass eine scharfe Kante vermieden wird.It can also be provided that a third transition edge 39, which is formed at the transition of the first conical surface 32 to the shaft region 25 of the valve element 5, also with a radius R to round. However, it is also possible a different rounding, which does not exactly correspond to a circle segment with radius R, but in cross section has a different shape, in which case it is important that a sharp edge is avoided.

In gleicher Weise ist es auch möglich, zur Minderung der Reibung zwischen dem Führungsabschnitt 15 des Ventilelements 5 und dem Bohrungsabschnitt 23 eine verschleißmindernde Beschichtung 40 auf die Teilfläche des Ventilelements 5 aufzubringen, die den Führungsabschnitt 15 bildet. Auch hier ist ein Rundungsradius R am Übergang des Führungsabschnitts 15 zur Druckschulter 13 vorgesehen, sodass sich die Beschichtung 40 in diesem Bereich nicht löst.In the same way, it is also possible to reduce the friction between the guide portion 15 of the valve element 5 and the bore portion 23, a wear-reducing coating 40 applied to the part surface of the valve element 5, which forms the guide portion 15. Again, a rounding radius R is provided at the transition of the guide portion 15 to the pressure shoulder 13, so that the coating 40 does not dissolve in this area.

Es ist auch möglich, das Ventilelement 5 über seine gesamte Oberfläche mit einer verschleißmindernden Beschichtung 40 zu versehen, weil es prozesstechnisch günstiger sein kann, das gesamte Ventilelement 5 mit einer DLC-Schicht zu versehen und nicht nur Teilflächen davon. Der Rundungsradius R oder die sonstige Rundungsform muss nicht an allen Kanten dieselbe sein. Es ist auch möglich, verschiedene Rundungsradien vorzusehen, die an die Gegebenheiten jeweils angepasst sind. Neben der Beschichtung eines Ventilelements 5, das hier die Form einer kolbenförmigen Ventilnadel aufweist, kann die Beschichtung auch auf jedes andere bewegliche Teil eines Ventils aufgebracht werden, wobei auch hier die Kanten entsprechend gerundet sind.It is also possible to provide the valve element 5 with a wear-reducing coating 40 over its entire surface, because it may be more cost-effective to provide the entire valve element 5 with a DLC layer and not just partial surfaces thereof. The rounding radius R or the other rounding form does not have to be the same on all edges. It is also possible to provide different rounding radii, which are adapted to the circumstances in each case. In addition to the coating of a valve element 5, which in this case has the shape of a piston-shaped valve needle, the coating can also be applied to any other movable part of a valve, in which case the edges are rounded accordingly.

Claims (2)

  1. Valve, preferably fuel injection valve for internal combustion engines, having a housing (1) with a movable valve element (5) arranged therein, the surface of which valve element has a substantially conical valve sealing surface (7) which is provided with a wear-reducing coating (40) and which is formed on that end of the valve element (5) which faces towards a valve seat (9), wherein the valve element (5) interacts with the valve seat (9) and, during operation of the valve, is subjected to repeated sliding or impact loads, wherein there is formed within the valve sealing surface (7) an edge (36; 38; 39) of rounded design, wherein there is formed in the valve sealing surface (7) an annular groove (30) which, at the transition to the valve sealing surface (7), has a first transition edge (36) and a second transition edge (38), wherein the transition edges (36; 38) are of rounded design and, when the valve is in the closed position, the first transition edge (36) comes into contact with the valve seat (9) and thereby forms a sealing edge, characterized in that the rounding is provided with a rounding radius (R) in the range from 100 µm to 150 µm.
  2. Valve according to Claim 1, characterized in that the coating (40) is formed as a carbon-containing, diamond-like coating (diamond like carbon, DLC).
EP06725242A 2005-05-02 2006-03-22 Valve, in particular fuel injection valve Active EP1880101B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510020365 DE102005020365A1 (en) 2005-05-02 2005-05-02 Valve, in particular fuel injection valve
PCT/EP2006/060959 WO2006117266A1 (en) 2005-05-02 2006-03-22 Valve, in particular fuel injection valve

Publications (2)

Publication Number Publication Date
EP1880101A1 EP1880101A1 (en) 2008-01-23
EP1880101B1 true EP1880101B1 (en) 2012-05-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06725242A Active EP1880101B1 (en) 2005-05-02 2006-03-22 Valve, in particular fuel injection valve

Country Status (4)

Country Link
EP (1) EP1880101B1 (en)
CN (1) CN101171421A (en)
DE (1) DE102005020365A1 (en)
WO (1) WO2006117266A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080152491A1 (en) * 2006-12-26 2008-06-26 Davies Lucy V Coatings for use in fuel system components
DE102007062701A1 (en) * 2007-12-27 2009-07-02 Robert Bosch Gmbh fuel Injector
US9051910B2 (en) 2013-01-31 2015-06-09 Caterpillar Inc. Valve assembly for fuel system and method
DE102015225733A1 (en) 2015-12-17 2017-06-22 Robert Bosch Gmbh fuel Injector
GB2561574B (en) * 2017-04-18 2020-09-23 Delphi Tech Ip Ltd Needle coating for injector closed loop
CN114962105A (en) * 2022-05-06 2022-08-30 北京理工大学 Monomer pump control valve for coating treatment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001061182A1 (en) * 2000-02-15 2001-08-23 Caterpillar Inc. Thin film coatings for fuel injector components
DE10038954A1 (en) * 2000-08-09 2002-02-28 Siemens Ag Valve used as an injection valve for a common rail injection system comprises a valve body with a valve body seat, and a valve needle guided in the valve body with a valve needle seat to control an opening
JP2004028051A (en) * 2002-06-28 2004-01-29 Denso Corp Fuel injection nozzle and method for manufacturing the same
DE10313225A1 (en) * 2003-03-25 2004-10-07 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
DE102004046886A1 (en) * 2004-09-28 2006-04-13 Robert Bosch Gmbh Fuel injector especially for IC engine has a coaxial design with one seal seat having an elastic seal for the second valve

Also Published As

Publication number Publication date
WO2006117266A1 (en) 2006-11-09
DE102005020365A1 (en) 2006-11-09
EP1880101A1 (en) 2008-01-23
CN101171421A (en) 2008-04-30

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