EP1387950B1 - Valve comprising radial recesses - Google Patents

Valve comprising radial recesses Download PDF

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Publication number
EP1387950B1
EP1387950B1 EP02732350A EP02732350A EP1387950B1 EP 1387950 B1 EP1387950 B1 EP 1387950B1 EP 02732350 A EP02732350 A EP 02732350A EP 02732350 A EP02732350 A EP 02732350A EP 1387950 B1 EP1387950 B1 EP 1387950B1
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EP
European Patent Office
Prior art keywords
valve
needle tip
wall
conical
valve body
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EP02732350A
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German (de)
French (fr)
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EP1387950A1 (en
Inventor
Patrick Mattes
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • 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

Definitions

  • Injectors are essential components of auto-ignition internal combustion engines. Their tasks include the metered injection, the preparation of the fuel, the shaping of the course of injection and the sealing against the combustion chamber. In addition to the main injection is u.a. In common-rail diesel injection systems, a pre-injection, which allows a reduction of exhaust emissions and noise emissions. However, the present invention relates not only to fuel injectors but to all types of nozzles.
  • DE 196 34 933 refers to a fuel injection valve for internal combustion engines with a valve member axially movable in a bore of a valve member.
  • the valve member has at its the combustion chamber of the internal combustion engine facing the end of a conical valve sealing surface, with which it cooperates with a conical valve seat surface at the combustion chamber side closed end of the bore of the valve body.
  • the conical valve sealing surface on the valve member is divided into two different cone angle having areas. At the transition of the two areas a valve sealing edge is formed.
  • the fuel injection valve has at least one injection opening, which is located in the downstream of the sealing edge region.
  • a shoulder is provided between each having a different cone angle having valve sealing surface areas, resulting in benefits for the metering accuracy of the injection quantity.
  • DE 198 44 638 A1 relates to a fuel injection valve having a nozzle needle, which is guided in a central guide bore of a nozzle body and having a circumferential sealing region, which forms a valve together with the valve seat of the nozzle body.
  • the valve is opened and closed depending on the position of the nozzle needle.
  • the sealing area controls the fuel supply to at least one injection hole in the nozzle.
  • the nozzle needle has a circumferential groove between the sealing area and the needle tip of the nozzle needle. The hole axis of the injection hole opens into the groove when the sealing area of the nozzle needle rests on the valve seat.
  • DE 198 20 513 A1 relates to a fuel injector for an internal combustion engine comprising a nozzle needle with a needle tip and a valve seat cooperating with the needle tip of the nozzle needle, wherein the valve seat has a conical sealing surface with an opening angle ⁇ 1 and the needle tip in the closed state of the injection valve to the fitting conical sealing surface with an opening angle have ⁇ 2 .
  • the needle tip and the needle housing define an annular flow channel. In the flow direction of the fuel to the sealing surfaces of the needle tip and valve seat following an extension of the annular flow channel between the needle tip and needle housing is formed.
  • the DE 199 31 891 has a fuel injection valve to the object.
  • the fuel injection valve has a nozzle needle, which in a central. Guide bore of a nozzle body is guided and has a circumferential sealing area.
  • the sealing area has a sealing edge which forms, together with the valve seat of the nozzle body, a valve which is opened or closed depending on the position of the nozzle needle, wherein the sealing edge controls the fuel inlet to at least one injection hole in the nozzle tip of the nozzle body.
  • the needle tip may include a further circumferential groove, wherein the axes of the injection holes open with the valve closed and also with fully open valve with maximum deflection of the nozzle needle into the further groove.
  • GB 562 033 A describes a differential needle type fuel injection valve in which the surface of the needle, which cooperates with the surface of the needle seat in the nozzle body, has an annular recess.
  • the annular recess creates a substantial gap between the opposing surfaces and divides the surface into two faces of significantly different diameters. In this case, caused by wear broadening of the contact area between the valve needle and the valve seat with the fuel is closed Injector valve limited to the width of a valve needle surface area above the annular recess.
  • a fuel injection valve for internal combustion engines which has a valve body and a bore executed as a blind bore, the bottom surface of which faces the combustion chamber.
  • a conical valve seat is formed, in which at least one injection opening is arranged.
  • a piston-shaped counter to a closing force longitudinally displaceable valve member is arranged, which has a valve member tip, which comes into abutment position of the valve member to the valve seat.
  • a first conical surface and a second conical surface arranged on the combustion chamber side are formed on the valve member tip, wherein the cone angle ( ⁇ ) of the first conical surface is smaller than the cone angle ( ⁇ ) of the valve seat, which in turn is the conical angle ( ⁇ ) of the second conical surface is.
  • an annular groove is formed, and on the second conical surface an additional circumferential annular groove is arranged, which in the closed position of the valve member at least partially covered with the injection openings to supply even with desachs jewem valve member all injection ports evenly with fuel.
  • the metering of injection quantity by a fuel injector varies over its life due to wear.
  • the position of the valve sealing surface that is to say the surface with which the valve needle tip is in contact with the conical valve body inner wall in the closed position of the valve, changes comes.
  • the valve dowel surface may "migrate" to both the larger and smaller diameter conical valve pin tips due to wear.
  • the valve needle thus comes in the closed position of the valve at a higher point relative to the valve body on the valve body inner wall to the plant. This results in a changed Injection process.
  • An advantage of the present invention is that it limits the "walking" of the valve sealing surface and reduces valve wear.
  • a valve having a valve pin in an axially displaceable valve needle, which has a conical valve needle tip at one end.
  • the valve needle tip in this case comprises a radial valve sealing surface, which comes to rest in the closed position of the valve on a conical valve body inner wall at the closed end of the bore.
  • In the conical valve body inner wall at least one opening is arranged, which connects the bore with the outside of the valve body.
  • the valve includes two radial recesses disposed in the valve needle tip or valve body inner wall, one of the radial recesses located upstream and the other radial recess downstream of the position of the valve sealing surface in the closed position of the valve.
  • valve sealing surface Between the radial recesses is a seating area to which the "walking" of the valve sealing surface is limited.
  • the valve needle tip In the closed position of the valve, the valve needle tip abuts the conical valve body inner wall with the valve sealing surface in that seating area and thus seals the bore upstream of the valve seal face against the bore downstream of the valve seal face and thus against the outside of the valve body.
  • the outer side of the valve body is to be understood as the volume into which a flowing liquid or gaseous medium enters when it leaves the valve via its openings when the valve is open.
  • the valve sealing surface (based on the closed position of the valve) can either "migrate" upstream to the upper edge of the first recess or up to the lower edge of the second recess, but not further.
  • the recesses prevent, where they are arranged radially in the valve needle tip or the valve body inner wall, a concern of the valve needle tip the valve body inner wall, as they create a distance between these two components of the valve.
  • the conical valve needle tip has a lateral surface which comprises at least three regions with different cone angles.
  • three areas with different cone angles ⁇ 1 , ⁇ 2 , ⁇ 3 are included, which are separated from each other in the closed position of the valve by one of the two radial recesses.
  • the cone angles ⁇ 1 , ⁇ 2 , ⁇ 3 of the three regions become larger downstream.
  • the present invention relates to a method for producing the valve according to the invention, wherein the recesses are manufactured by machining a standard valve, for example by machining.
  • FIG. 1 shows two variants of the valve according to the invention combined in a schematic drawing.
  • One variant is shown to the left of the symmetry axis 1, the other to the right.
  • Main components of the valve shown are the valve needle 2 and the valve body 3, wherein the valve needle 2 is axially displaceable in the valve body 3.
  • the valve needle 2 has at its end a conical valve needle tip 4.
  • the valve body 3 includes a bore 5 which tapers at the end.
  • openings 7 are arranged, which connect the bore 5 with the valve open to the outside 8 of the valve body 3.
  • valve needle tip 4 comes with a radial valve sealing surface 9 on the conical valve body inner wall 6 to the plant.
  • the valve sealing surface 9 has the shape of the lateral surface of a truncated cone. It rests against the conical valve body inner wall 6 when the valve is closed and thus seals the bore 5 upstream of the valve sealing face 9 against the bore 5 downstream of the valve sealing face 9. The valve is then tightly closed and a liquid or gaseous medium can not escape from the openings 7 to the outside 8.
  • the valve contains two radial recesses 12 and 13. Both are arranged in the valve needle tip 4.
  • the lateral surface of the valve needle tip 4 comprises three regions with different cone angles ⁇ 1 , ⁇ 2 and ⁇ 3 .
  • the three areas are each separated by one of the two recesses 12, 13.
  • the boundaries of the regions are between the upper 18 and the lower edge 19 or on one of the two edges of the respective recess 12, 13.
  • the cone angles ⁇ 1 , ⁇ 2 , ⁇ 3 of the three regions become larger downstream ( ⁇ 1 ⁇ 2 ⁇ 3 ).
  • the cone angle ⁇ of the conical valve body inner wall 6 is smaller than the cone angle ⁇ 3 and greater than the cone angle ⁇ 2 .
  • valve sealing surface 9 on the valve body inner wall 6 in the closed position of the valve can only move in the seating area 14 between the recesses 12 and 13.
  • the distance between the two recesses 12 and 13 dictates how far the valve sealing surface can maximally "migrate", how large the possible seating area 14 is.
  • the only difference from the first variant is that only the first radial recess 16 is arranged in the valve needle tip 4, whereas the second radial recess 17 is located in the conical valve body inner wall 6.
  • the same effect as in the first variant is achieved: the valve sealing surface 9 can only "wander" along the seating area 15 due to wear of the valve, which is limited by the two recesses 16 and 17 in the closed position of the valve.
  • Conceivable are other variants of the valve according to the invention (not shown in the figure), in which, for example, both recesses in the conical valve body inner wall 6 or the first recess in the valve body inner wall 6 and the second recess in the valve needle tip 4 are arranged.
  • the recesses have a cross section with the shape of a circle segment (groove).
  • Other possible shapes that may have the cross section of the respective recess are those of a circular sector, a three-, four- or other polygon or combinations of different of the mentioned forms.
  • a combination is meant, for example, a cross-section with the shape of a circular sector, which merges into a quadrangle.
  • the valve is a fuel injector, preferably in autoignition internal combustion engines.
  • fuel injection systems results over the life of the fuel injector an injection quantity drift by a wear-related "wandering" of the valve sealing surface 9.
  • a changed course of injection can lead to unwanted exhaust emissions, noisy running noise or greater wear of the self-igniting internal combustion engine.
  • this injection quantity drift is advantageously limited and greatly reduced since the valve sealing surface 9 can only "move" within the seat region 14, 15.
  • the maximum mass drift can be adjusted during the life of the fuel injector.
  • the valve according to the invention is used as a fuel injection nozzle in self-igniting internal combustion engines with common rail diesel injection.
  • the pre-injection quantity decreases as a result of wear-related migration of the valve sealing face 9 to larger valve needle diameters, in the In extreme cases, the pre-injection is completely off. This is advantageously prevented by the use of valves according to the invention.
  • the valve according to the invention can be constructed as a seat or blind hole nozzle.
  • the openings 7 of a blind hole nozzle are arranged in a blind hole, which is located in the closed position of the valve below the valve needle tip 4 in the valve body 3.
  • seat hole nozzles the beginning of the openings 7 is in the valve body inner wall 6, that they are largely covered by the valve needle tip 4 with the nozzle closed.
  • FIG. 1 an embodiment of the valve according to the invention is shown as a seat hole nozzle.

Description

Technisches GebietTechnical area

Einspritzdüsen sind wesentliche Bauteile von selbstzündenden Brennkraftmaschinen. Zu ihren Aufgaben zählen das dosierte Einspritzen, das Aufbereiten des Kraftstoffs, das Formen des Einspritzverlaufs und das Abdichten gegen den Brennraum. Neben der Haupteinspritzung erfolgt u.a. bei Common Rail-Dieseleinspritzsystemen eine Voreinspritzung, die eine Absenkung von Abgasemissionen und von Geräuschabstrahlungen ermöglicht. Die vorliegende Erfindung betrifft jedoch nicht nur Kraftstoffeinspritzdüsen, sondern alle Arten von Düsen bzw. Zumeßventilen.Injectors are essential components of auto-ignition internal combustion engines. Their tasks include the metered injection, the preparation of the fuel, the shaping of the course of injection and the sealing against the combustion chamber. In addition to the main injection is u.a. In common-rail diesel injection systems, a pre-injection, which allows a reduction of exhaust emissions and noise emissions. However, the present invention relates not only to fuel injectors but to all types of nozzles.

Stand der TechnikState of the art

DE 196 34 933 bezieht sich auf ein Kraftstoffeinspritzventil für Brennkraftmaschinen mit einem in einer Bohrung eines Ventilkörpers axial verschiebbaren Ventilglied. Das Ventilglied weist an seinem dem Brennraum der Brennkraftmaschine zugewandten Ende eine konische Ventildichtfläche auf, mit der es mit einer konischen Ventilsitzfläche am brennraumseitigen geschlossenen Ende der Bohrung des Ventilkörpers zusammenwirkt. Die konische Ventildichtfläche am Ventilglied ist in zwei unterschiedliche Kegelwinkel aufweisende Bereiche geteilt. An dem Übergang der zwei Bereiche ist eine Ventildichtkante gebildet. Ferner weist das Kraftstoffeinspritzventil wenigstens eine Einspritzöffnung auf, die sich in dem sich stromabwärts an die Dichtkante anschließenden Bereich befindet. Schließlich ist zwischen den jeweils einen unterschiedlichen Kegelwinkel aufweisenden Ventildichtflächenbereichen ein Absatz vorgesehen, woraus sich Vorteile für die Zumeßgenauigkeit der Einspritzmenge ergeben. DE 196 34 933 refers to a fuel injection valve for internal combustion engines with a valve member axially movable in a bore of a valve member. The valve member has at its the combustion chamber of the internal combustion engine facing the end of a conical valve sealing surface, with which it cooperates with a conical valve seat surface at the combustion chamber side closed end of the bore of the valve body. The conical valve sealing surface on the valve member is divided into two different cone angle having areas. At the transition of the two areas a valve sealing edge is formed. Furthermore, the fuel injection valve has at least one injection opening, which is located in the downstream of the sealing edge region. Finally, a shoulder is provided between each having a different cone angle having valve sealing surface areas, resulting in benefits for the metering accuracy of the injection quantity.

DE 198 44 638 A1 bezieht sich auf ein Kraftstoffeinspritzventil mit einer Düsennadel, die in einer zentralen Führungsbohrung eines Düsenkörpers geführt ist und einen umlaufenden Dichtbereich aufweist, der zusammen mit dem Ventilsitz des Düsenkörpers ein Ventil bildet. Das Ventil ist abhängig von der Position der Düsennadel geöffnet und geschlossen. Der Dichtbereich steuert den Kraftstoffzulauf zu mindestens einem Einspritzloch in der Düse. Die Düsennadel weist zwischen dem Dichtbereich und der Nadelspitze der Düsennadel eine umlaufende Nut auf. Die Lochachse des Einspritzlochs mündet in die Nut, wenn der Dichtbereich der Düsennadel auf dem Ventilsitz aufliegt. DE 198 44 638 A1 relates to a fuel injection valve having a nozzle needle, which is guided in a central guide bore of a nozzle body and having a circumferential sealing region, which forms a valve together with the valve seat of the nozzle body. The valve is opened and closed depending on the position of the nozzle needle. The sealing area controls the fuel supply to at least one injection hole in the nozzle. The nozzle needle has a circumferential groove between the sealing area and the needle tip of the nozzle needle. The hole axis of the injection hole opens into the groove when the sealing area of the nozzle needle rests on the valve seat.

DE 198 20 513 A1 betrifft eine Kraftstoffeinspritzdüse für eine Brennkraftmaschine enthaltend eine Düsennadel mit einer Nadelspitze und einen mit der Nadelspitze der Düsennadel zusammenwirkenden Ventilsitz, wobei der Ventilsitz eine konische Dichtfläche mit einem Öffnungswinkel α1 und die Nadelspitze eine im geschlossenen Zustand des Einspritzventils an diese anliegende konische Dichtfläche mit einem Öffnungswinkel α2 aufweisen. Die Nadelspitze und das Nadelgehäuse begrenzen einen ringförmigen Strömungskanal. In Strömungsrichtung des Kraftstoffs auf die Dichtflächen ist von Nadelspitze und Ventilsitz folgend eine Erweiterung des ringförmigen Strömungskanals zwischen Nadelspitze und Nadelgehäuse ausgebildet. DE 198 20 513 A1 relates to a fuel injector for an internal combustion engine comprising a nozzle needle with a needle tip and a valve seat cooperating with the needle tip of the nozzle needle, wherein the valve seat has a conical sealing surface with an opening angle α 1 and the needle tip in the closed state of the injection valve to the fitting conical sealing surface with an opening angle have α 2 . The needle tip and the needle housing define an annular flow channel. In the flow direction of the fuel to the sealing surfaces of the needle tip and valve seat following an extension of the annular flow channel between the needle tip and needle housing is formed.

DE 199 31 891 hat ein Kraftstoffeinspritzventil zum Gegenstand. Das Kraftstoffeinspritzventil weist eine Düsennadel auf, die in einer zentralen. Führungsbohrung eines Düsenkörpers geführt ist und einen umlaufenden Dichtbereich aufweist. Der Dichtbereich weist eine Dichtkante auf, die zusammen mit dem Ventilsitz des Düsenkörpers ein Ventil bildet, das abhängig von der Position der Düsennadel geöffnet oder geschlossen ist, wobei die Dichtkante den Kraftstoffzulauf zu mindestens einem Einspritzloch in der Düsenspitze des Düsenkörpers steuert. Die Nadelspitze kann eine weitere umlaufende Nut enthalten, wobei die Achsen der Einspritzlöcher bei geschlossenem Ventil und auch bei vollständig geöffnetem Ventil mit maximaler Auslenkung der Düsennadel in die weitere Nut münden. DE 199 31 891 has a fuel injection valve to the object. The fuel injection valve has a nozzle needle, which in a central. Guide bore of a nozzle body is guided and has a circumferential sealing area. The sealing area has a sealing edge which forms, together with the valve seat of the nozzle body, a valve which is opened or closed depending on the position of the nozzle needle, wherein the sealing edge controls the fuel inlet to at least one injection hole in the nozzle tip of the nozzle body. The needle tip may include a further circumferential groove, wherein the axes of the injection holes open with the valve closed and also with fully open valve with maximum deflection of the nozzle needle into the further groove.

GB 562 033 A beschreibt ein Kraftstoff-Einspritzventil vom Differential-Nadeltyp, bei welchem die Oberfläche der Nadel, welche mit der Oberfläche des Nadelsitzes im Düsenkörper zusammenwirkt, eine ringförmige Vertiefung aufweist. Die ringförmige Vertiefung stellt einen wesentlichen Zwischenraum zwischen den einander gegenüberliegenden Oberflächen her und unterteilt die Oberfläche in zwei Teilflächen von erheblich unterschiedlichen Durchmessern. Dabei wird eine durch Verschleiß verursachte Verbreiterung des Kontaktbereichs zwischen der Ventilnadel und dem Ventilsitz bei geschlossenem Kraftstoff Einspritzventil auf die Breite eines Ventilnadel-Oberflächenbereichs oberhalb der ringförmigen Vertiefung begrenzt. GB 562 033 A describes a differential needle type fuel injection valve in which the surface of the needle, which cooperates with the surface of the needle seat in the nozzle body, has an annular recess. The annular recess creates a substantial gap between the opposing surfaces and divides the surface into two faces of significantly different diameters. In this case, caused by wear broadening of the contact area between the valve needle and the valve seat with the fuel is closed Injector valve limited to the width of a valve needle surface area above the annular recess.

In WO 02/01066 A1 wird ein Kraftstoff-Einspritzventil für Brennkraftmaschinen gezeigt, welches einen Ventilkörper und eine als Sackbohrung ausgeführte Bohrung aufweist, deren Bodenfläche dem Brennraum zugewandt ist. An der Bodenfläche ist ein konischer Ventilsitz ausgebildet, in dem wenigstens eine Einspritzöffnung angeordnet ist. In der Bohrung ist ein kolbenförmiges entgegen einer Schließkraft längs verschiebbares Ventilglied angeordnet, das eine Ventilgliedspitze aufweist, die in Schließstellung des Ventilgliedes am Ventilsitz zur Anlage kommt. An der Ventilgliedspitze ist eine erste Konusfläche und eine zweite, brennraumseitig zur ersten Konusfläche angeordnete Konusfläche ausgebildet, wobei der Konuswinkel (α) der ersten Konusfläche kleiner als der Konuswinkel (γ) des Ventilsitzes ist, welcher wiederum als der Konuswinkel (β) der zweiten Konusfläche ist. Zwischen der ersten und zweiten Konusfläche ist eine Ringnut ausgebildet, und an der zweiten Konusfläche ist eine zusätzliche umlaufende Ringnut angeordnet, die sich in Schließstellung des Ventilgliedes zumindest teilweise mit den Einspritzöffnungen überdeckt, um auch bei desachsiertem Ventilglied alle Einspritzöffnungen gleichmäßig mit Kraftstoff zu versorgen.In WO 02/01066 A1 a fuel injection valve for internal combustion engines is shown, which has a valve body and a bore executed as a blind bore, the bottom surface of which faces the combustion chamber. On the bottom surface, a conical valve seat is formed, in which at least one injection opening is arranged. In the bore a piston-shaped counter to a closing force longitudinally displaceable valve member is arranged, which has a valve member tip, which comes into abutment position of the valve member to the valve seat. A first conical surface and a second conical surface arranged on the combustion chamber side are formed on the valve member tip, wherein the cone angle (α) of the first conical surface is smaller than the cone angle (γ) of the valve seat, which in turn is the conical angle (β) of the second conical surface is. Between the first and second conical surface, an annular groove is formed, and on the second conical surface an additional circumferential annular groove is arranged, which in the closed position of the valve member at least partially covered with the injection openings to supply even with desachsiertem valve member all injection ports evenly with fuel.

Die Zumessung der Einspritzmenge durch eine Kraftstoffeinspritzdüse ändert sich über ihre Lebensdauer aufgrund von Verschleiß. Insbesondere bei Common Rail Injektoren verändert sich die Position der Ventildichtfläche, also derjenigen Fläche, mit der die Ventilnadelspitze in Schließstellung des Ventils an der konischen Ventilkörperinnenwand zur Anlage kommt. Die Ventildichifläche kann, verursacht durch Verschleiß, sowohl zum größeren als auch zum kleineren Durchmesser der konischen Ventilnadelspitze "wandern". Die Ventilnadel kommt folglich in Schließposition des Ventils an einem höheren Punkt relativ zum Ventilkörper an der Ventilkörperinnenwand zur Anlage. Dadurch ergibt sich ein veränderter Einspritzverlauf. Dies führt insbesondere bei Common Rail Einspritzdüsen dazu, daß mit fortschreitender Lastspielzahl (Zahl der Lastwechsel) die Voreinspritzmenge kleiner wird und schließlich ganz wegfällt.The metering of injection quantity by a fuel injector varies over its life due to wear. Particularly in the case of common rail injectors, the position of the valve sealing surface, that is to say the surface with which the valve needle tip is in contact with the conical valve body inner wall in the closed position of the valve, changes comes. The valve dowel surface may "migrate" to both the larger and smaller diameter conical valve pin tips due to wear. The valve needle thus comes in the closed position of the valve at a higher point relative to the valve body on the valve body inner wall to the plant. This results in a changed Injection process. This leads in particular in common rail injectors to the fact that with progressive load cycle number (number of load changes), the pre-injection amount is smaller and eventually completely eliminated.

Darstellung der ErfindungPresentation of the invention

Ein Vorteil der vorliegenden Erfindung ist, daß das "Wandern" der Ventildichtfläche begrenzt und der Verschleiß des Ventils reduziert wird. Dies wird erreicht durch ein Ventil mit einer in einer Bohrung eines Ventilkörpers axial verschiebbaren Ventilnadel, die an ihrem einen Ende eine konische Ventilnadelspitze aufweist. Die Ventilnadelspitze umfaßt dabei eine radiale Ventildichtfläche, die in Schließstellung des Ventils an einer konischen Ventilkörperinnenwand am geschlossenen Ende der Bohrung zur Anlage kommt. In der konischen Ventilkörperinnenwand ist mindestens eine Öffnung angeordnet, die die Bohrung mit der Außenseite des Ventilkörpers verbindet. Das Ventil enthält zwei radiale Ausnehmungen, die in der Ventilnadelspitze oder der Ventilkörperinnenwand angeordnet sind, wobei sich eine der radialen Ausnehmungen stromaufwärts und die andere radiale Ausnehmung stromabwärts von der Position der Ventildichtfläche in Schließstellung des Ventils befindet.An advantage of the present invention is that it limits the "walking" of the valve sealing surface and reduces valve wear. This is achieved by a valve having a valve pin in an axially displaceable valve needle, which has a conical valve needle tip at one end. The valve needle tip in this case comprises a radial valve sealing surface, which comes to rest in the closed position of the valve on a conical valve body inner wall at the closed end of the bore. In the conical valve body inner wall at least one opening is arranged, which connects the bore with the outside of the valve body. The valve includes two radial recesses disposed in the valve needle tip or valve body inner wall, one of the radial recesses located upstream and the other radial recess downstream of the position of the valve sealing surface in the closed position of the valve.

Zwischen den radialen Ausnehmungen befindet sich ein Sitzbereich, auf den das "Wandern" der Ventildichtfläche begrenzt ist. In Schließstellung des Ventils kommt die Ventilnadelspitze mit der Ventildichtfläche in diesem Sitzbereich an der konischen Ventilkörperinnenwand zur Anlage und dichtet somit die Bohrung stromaufwärts von der Ventildichtfläche gegen die Bohrung stromabwärts von der Ventildichtfläche und somit auch gegen die Außenseite des Ventilkörpers ab. Unter der Außenseite des Ventilkörpers ist in diesem Zusammenhang dasjenige Volumen zu verstehen, in das ein strömendes flüssiges oder gasförmiges Medium eintritt, wenn es bei geöffnetem Ventil aus dem Ventil über seine Öffnungen austritt. Mit zunehmendem Verschleiß kann die Ventildichtfläche (bezogen auf die Schließstellung des Ventils) entweder bis zur Oberkante der ersten Ausnehmung stromabwärts oder bis zur Unterkante der zweiten Ausnehmung stromaufwärts "wandern", aber nicht weiter. Die Ausnehmungen verhindern, dort wo sie radial in der Ventilnadelspitze oder der Ventilkörperinnenwand angeordnet sind, ein Anliegen der Ventilnadelspitze an der Ventilkörperinnenwand, da sie einen Abstand zwischen diesen beiden Bestandteilen des Ventils erzeugen.Between the radial recesses is a seating area to which the "walking" of the valve sealing surface is limited. In the closed position of the valve, the valve needle tip abuts the conical valve body inner wall with the valve sealing surface in that seating area and thus seals the bore upstream of the valve seal face against the bore downstream of the valve seal face and thus against the outside of the valve body. In this context, the outer side of the valve body is to be understood as the volume into which a flowing liquid or gaseous medium enters when it leaves the valve via its openings when the valve is open. With increasing wear, the valve sealing surface (based on the closed position of the valve) can either "migrate" upstream to the upper edge of the first recess or up to the lower edge of the second recess, but not further. The recesses prevent, where they are arranged radially in the valve needle tip or the valve body inner wall, a concern of the valve needle tip the valve body inner wall, as they create a distance between these two components of the valve.

Die konische Ventilnadelspitze besitzt eine Mantelfläche, die mindestens drei Bereiche mit verschiedenen Kegelwinkeln umfasst.The conical valve needle tip has a lateral surface which comprises at least three regions with different cone angles.

Die Anordnung dieser mindestens drei Bereiche der Ventilnadelspitze mit den verschiedenen Kegelwinkeln in Kombination mit den Positionen der erfindungsgemäßen zwei radialen Ausnehmungen und dem Kegelwinkel der konischen Ventilkörperinnenwand definieren, auf welcher Position der Ventilnadelspitze sich die Ventildichtfläche befindet.The arrangement of these at least three regions of the valve needle tip with the different cone angles in combination with the positions of the two radial recesses according to the invention and the cone angle of the conical valve body inner wall define at which position of the valve needle tip the valve sealing surface is located.

Dabei sind drei Bereiche mit verschiedenen Kegelwinkeln δ1, δ2, δ3 umfasst, welche in Schließstellung des Ventils jeweils durch eine der zwei radialen Ausnehmungen voneinander getrennt sind. Die Kegelwinkel δ1, δ2, δ3 der drei Bereiche werden stromabwärts größer.In this case, three areas with different cone angles δ 1 , δ 2 , δ 3 are included, which are separated from each other in the closed position of the valve by one of the two radial recesses. The cone angles δ 1 , δ 2 , δ 3 of the three regions become larger downstream.

Ferner betrifft die vorliegende Erfindung ein Verfahren zur Herstellung des erfindungsgemäßen Ventils, wobei die Ausnehmungen durch Bearbeitung eines Standardventils gefertigt werden, beispielsweise durch spanende Bearbeitung. Durch Verwendung von Standardventilen, die serienmäßig eingesetzt werden, können die erfindungsgemäßen Ventile kostengünstig und mit geringem Aufwand hergestellt werden.Furthermore, the present invention relates to a method for producing the valve according to the invention, wherein the recesses are manufactured by machining a standard valve, for example by machining. By using standard valves that are used as standard, valves of the invention can be produced inexpensively and with little effort.

Zeichnungdrawing

Anhand der Figur wird die Erfindung nachstehend näher erläutert.With reference to the figure, the invention will be explained in more detail below.

Es zeigt:

Figur 1
zwei mögliche Ausführungsformen des erfindungsgemäßen Ventils.
It shows:
FIG. 1
two possible embodiments of the valve according to the invention.

Ausführungsvariantenvariants

Figur 1 zeigt zwei Varianten des erfindungsgemäßen Ventils kombiniert in einer schematischen Zeichnung. Eine Variante ist links von der Symmetrieachse 1, die andere rechts davon dargestellt. Hauptbestandteile des gezeigten Ventils sind die Ventilnadel 2 und der Ventilkörper 3, wobei die Ventilnadel 2 axial in dem Ventilkörper 3 verschiebbar ist. Die Ventilnadel 2 weist an ihrem Ende eine konische Ventilnadelspitze 4 auf. Der Ventilkörper 3 enthält eine Bohrung 5, die am Ende konisch zuläuft. In der konischen Ventilkörperinnenwand 6 sind Öffnungen 7 angeordnet, die die Bohrung 5 bei geöffnetem Ventil mit der Außenseite 8 des Ventilkörpers 3 verbinden. FIG. 1 shows two variants of the valve according to the invention combined in a schematic drawing. One variant is shown to the left of the symmetry axis 1, the other to the right. Main components of the valve shown are the valve needle 2 and the valve body 3, wherein the valve needle 2 is axially displaceable in the valve body 3. The valve needle 2 has at its end a conical valve needle tip 4. The valve body 3 includes a bore 5 which tapers at the end. In the conical valve body inner wall 6 openings 7 are arranged, which connect the bore 5 with the valve open to the outside 8 of the valve body 3.

In der Schließstellung des Ventils kommt die Ventilnadelspitze 4 mit einer radialen Ventildichtfläche 9 an der konischen Ventilkörperinnenwand 6 zur Anlage. Die Ventildichtfläche 9 hat die Form der Mantelfläche eines Kegelstumpfs. Sie liegt bei geschlossenem Ventil an der konischen Ventilkörperinnenwand 6 an und dichtet somit die Bohrung 5 stromaufwärts 10 von der Ventildichtfläche 9 gegen die Bohrung 5 stromabwärts 11 von der Ventildichtfläche 9 ab. Das Ventil ist dann dicht geschlossen und ein flüssiges oder gasförmiges Medium kann nicht aus den Öffnungen 7 zur Außenseite 8 austreten.In the closed position of the valve, the valve needle tip 4 comes with a radial valve sealing surface 9 on the conical valve body inner wall 6 to the plant. The valve sealing surface 9 has the shape of the lateral surface of a truncated cone. It rests against the conical valve body inner wall 6 when the valve is closed and thus seals the bore 5 upstream of the valve sealing face 9 against the bore 5 downstream of the valve sealing face 9. The valve is then tightly closed and a liquid or gaseous medium can not escape from the openings 7 to the outside 8.

Bei der links von der Symmetrieachse 12 dargestellten ersten Variante des erfindungsgemäßen Ventils enthält das Ventil zwei radiale Ausnehmungen 12 und 13. Beide sind in der Ventilnadelspitze 4 angeordnet.In the first variant of the valve according to the invention shown on the left of the symmetry axis 12, the valve contains two radial recesses 12 and 13. Both are arranged in the valve needle tip 4.

In dem erfindungsgemäßen Ventil umfaßt die Mantelfläche der Ventilnadelspitze 4 drei Bereiche mit verschiedenen Kegelwinkeln δ1, δ2 und δ3. Die drei Bereiche werden jeweils durch eine der zwei Ausnehmungen 12, 13 voneinander getrennt. Die Grenzen der Bereiche liegen zwischen der oberen 18 und der unteren Kante 19 oder auf einer der beiden Kanten der jeweiligen Ausnehmung 12, 13. Die Kegelwinkel δ1, δ2, δ3 der drei Bereiche werden stromabwärts 11 größer (δ1 < δ2 < δ3). Der Kegelwinkel β der konischen Ventilkörperinnenwand 6 ist kleiner als der Kegelwinkel δ3 und größer als der Kegelwinkel δ2. Dadurch ist die Position der Ventildichtfläche 9 des Ventils, bevor es verschleißt, genau definiert. Sie liegt an dem Übergang zwischen den beiden Bereichen mit den Kegelwinkeln δ2 und δ3 oder, falls dort wie in Figur 1 eine Ausnehmung 12 angeordnet ist, an der oberen Kante dieser Ausnehmung 12. Durch Verschleiß kann sich die Anlage-Position der Ventildichtfläche 9 an der Ventilkörperinnenwand 6 in Schließposition des Ventils lediglich in dem Sitzbereich 14 zwischen den Ausnehmungen 12 und 13 verschieben. Der Abstand zwischen den beiden Ausnehmungen 12 und 13 gibt vor, wie weit die Ventildichtfläche maximal "wandern" kann, wie groß demnach der mögliche Sitzbereich 14 ist.In the valve according to the invention, the lateral surface of the valve needle tip 4 comprises three regions with different cone angles δ 1 , δ 2 and δ 3 . The three areas are each separated by one of the two recesses 12, 13. The boundaries of the regions are between the upper 18 and the lower edge 19 or on one of the two edges of the respective recess 12, 13. The cone angles δ 1 , δ 2 , δ 3 of the three regions become larger downstream (δ 1 <δ 2 <δ 3 ). The cone angle β of the conical valve body inner wall 6 is smaller than the cone angle δ 3 and greater than the cone angle δ 2 . Thereby, the position of the valve sealing surface 9 of the valve, before it wears, is precisely defined. It lies at the transition between the two areas with the cone angles δ 2 and δ 3 or, if there as in FIG. 1 Due to wear, the abutment position of the valve sealing surface 9 on the valve body inner wall 6 in the closed position of the valve can only move in the seating area 14 between the recesses 12 and 13. The distance between the two recesses 12 and 13 dictates how far the valve sealing surface can maximally "migrate", how large the possible seating area 14 is.

Durch die Vorgabe δ1 < δ2 für die Kegelwinkel der zwei Ventilnadelspitzen-Bereiche ergeben sich zwei Differenzwinkel α1, α2 von der Ventilnadelspitze 4 zu der konischen Ventilkörperinnenwand 6, für die gilt: α2 > α1. Dies ist eine weitere Maßnahme, um ein Wandern der Ventildichtfläche 9 zu einem größeren Ventilnadeldurchmesser hin, oberhalb der zweiten Ausnehmung 13, zu verhindern. Als Ergebnis liegt die Ventildichtfläche 9 bei geschlossenem Ventil ausschließlich in dem Sitzbereich 14 an der Ventilkörperinnenwand 6 an.The specification δ 1 <δ 2 for the cone angles of the two valve needle tip regions results in two difference angles α 1 , α 2 from the valve needle tip 4 to the conical valve body inner wall 6, for which α 2 > α 1 . This is a further measure to prevent the valve sealing surface 9 from wandering to a larger valve needle diameter, above the second recess 13. As a result, the valve sealing surface 9 is closed Valve exclusively in the seating area 14 on the valve body inner wall 6.

Zur Gewährleistung, daß der Differenzwinkel α2 größer als der Differenzwinkel α1 ist, wäre auch denkbar, daß die Ventilnadelspitze nur zwei Bereiche mit unterschiedlichen Kegelwinkeln δ2 und δ3 aufweist, die Ventilkörperinnenwand 6 jedoch in Schließposition des Ventils stromaufwärts 10 von der unteren Kante der zweiten Ausnehmung 13 einen Kegelwinkel aufweist, der größer als der Kegelwinkel β der Ventilkörperinnenwand 6 stromabwärts 11 davon ist. Folglich würde das konische Ende des Ventilkörpers 3 stromaufwärts 10 einen "Knick nach außen" aufweisen.To ensure that the difference angle α 2 is greater than the difference angle α 1 , it would also be conceivable that the valve needle tip only two areas with different cone angles δ 2 and δ 3 , the valve body inner wall 6 but in the closed position of the valve upstream 10 of the lower edge the second recess 13 has a cone angle which is greater than the cone angle β of the valve body inner wall 6 downstream 11 thereof. Consequently, the conical end of the valve body 3 would have a "bend outwards" upstream.

Für die zweite, rechts von der Symmetrieachse 1 dargestellte Variante des erfindungsgemäßen Ventils gilt dasselbe wie für die erste Variante. Der einzige Unterschied zur ersten Variante besteht darin, daß nur die erste radiale Ausnehmung 16 in der Ventilnadelspitze 4 angeordnet ist, wohingegen sich die zweite radiale Ausnehmung 17 in der konischen Ventilkörperinnenwand 6 befindet. Dadurch wird derselbe Effekt wie in der ersten Variante erzielt: Die Ventildichtfläche 9 kann infolge von Verschleiß des Ventils lediglich entlang des Sitzbereiches 15 "wandern", der in Schließposition des Ventils durch die beiden Ausnehmungen 16 und 17 begrenzt wird.For the second, shown on the right of the symmetry axis 1 variant of the valve according to the invention the same applies as for the first variant. The only difference from the first variant is that only the first radial recess 16 is arranged in the valve needle tip 4, whereas the second radial recess 17 is located in the conical valve body inner wall 6. As a result, the same effect as in the first variant is achieved: the valve sealing surface 9 can only "wander" along the seating area 15 due to wear of the valve, which is limited by the two recesses 16 and 17 in the closed position of the valve.

Denkbar sind weitere Varianten des erfindungsgemäßen Ventils (nicht in der Figur dargestellt), bei denen zum Beispiel beide Ausnehmungen in der konischen Ventilkörperinnenwand 6 oder die erste Ausnehmung in der Ventilkörperinnenwand 6 und die zweite Ausnehmung in der Ventilnadelspitze 4 angeordnet sind.Conceivable are other variants of the valve according to the invention (not shown in the figure), in which, for example, both recesses in the conical valve body inner wall 6 or the first recess in the valve body inner wall 6 and the second recess in the valve needle tip 4 are arranged.

Bei den in Figur 1 dargestellten Varianten der vorliegenden Erfindung haben die Ausnehmungen einen Querschnitt mit der Form eines Kreissegments (Nut). Weitere mögliche Formen, die der Querschnitt der jeweiligen Ausnehmung haben kann, sind die eines Kreissektors, eines Drei-, Vier- oder sonstigen Vielecks oder Kombinationen aus verschiedenen der genannten Formen. Unter eine Kombination ist beispielsweise ein Querschnitt mit der Form eines Kreissektors, der in ein Viereck übergeht, zu verstehen.At the in FIG. 1 illustrated variants of the present invention, the recesses have a cross section with the shape of a circle segment (groove). Other possible shapes that may have the cross section of the respective recess are those of a circular sector, a three-, four- or other polygon or combinations of different of the mentioned forms. By a combination is meant, for example, a cross-section with the shape of a circular sector, which merges into a quadrangle.

Bei einer bevorzugten Ausführungsform der vorliegenden Erfindung ist das Ventil eine Kraftstoffeinspritzdüse, vorzugsweise in selbstzündenden Brennkraftmaschinen. Bei Kraftstoffeinspritzsystemen ergibt sich über die Lebensdauer der Kraftstoffeinspritzdüse eine Einspritzmengendrift durch ein verschleißbedingtes "Wandern" der Ventildichtfläche 9. Ein veränderter Einspritzverlauf kann zu unerwünschten Abgasemissionen, lauteren Laufgeräuschen oder einem größeren Verschleiß der selbstzündenden Brennkraftmaschine führen. Bei einem erfindungsgemäßen Ventil wird diese Einspritzmengendrift in vorteilhafter Weise begrenzt und stark verringert, da die Ventildichtfläche 9 lediglich innerhalb des Sitzbereichs 14, 15 "wandern" kann. In Abhängigkeit von dem axialen Abstand der beiden Ausnehmungen kann die maximale Mengendrift während der Lebensdauer der Kraftstoffeinspritzdüse eingestellt werden.In a preferred embodiment of the present invention, the valve is a fuel injector, preferably in autoignition internal combustion engines. In fuel injection systems results over the life of the fuel injector an injection quantity drift by a wear-related "wandering" of the valve sealing surface 9. A changed course of injection can lead to unwanted exhaust emissions, noisy running noise or greater wear of the self-igniting internal combustion engine. In a valve according to the invention, this injection quantity drift is advantageously limited and greatly reduced since the valve sealing surface 9 can only "move" within the seat region 14, 15. Depending on the axial distance of the two recesses, the maximum mass drift can be adjusted during the life of the fuel injector.

Vorzugsweise wird das erfindungsgemäße Ventil als Kraftstoffeinspritzdüse in selbstzündenden Brennkraftmaschinen mit Common Rail-Dieseleinspritzung eingesetzt. Insbesondere bei Common Rail-Düsen verringert sich die Voreinspritzmenge durch ein verschleißbedingtes Wandern der Ventildichtfläche 9 zu größeren Ventilnadeldurchmessern hin, im Extremfall bleibt die Voreinspritzung ganz aus. Dies wird in vorteilhafter Weise durch den Einsatz erfindungsgemäßer Ventile verhindert.Preferably, the valve according to the invention is used as a fuel injection nozzle in self-igniting internal combustion engines with common rail diesel injection. Particularly in the case of common rail nozzles, the pre-injection quantity decreases as a result of wear-related migration of the valve sealing face 9 to larger valve needle diameters, in the In extreme cases, the pre-injection is completely off. This is advantageously prevented by the use of valves according to the invention.

Das erfindungsgemäße Ventil kann als Sitz- oder Sacklochdüse aufgebaut sein. Die Öffnungen 7 einer Sacklochdüse sind in einem Sackloch angeordnet, das sich in Schließstellung des Ventils unterhalb der Ventilnadelspitze 4 in dem Ventilkörper 3 befindet. Bei Sitzlochdüsen liegt der Anfang der Öffnungen 7 so in der Ventilkörperinnenwand 6, daß sie bei geschlossener Düse durch die Ventilnadelspitze 4 weitgehend abgedeckt sind. In Figur 1 ist eine Ausführung des erfindungsgemäßen Ventils als Sitzlochdüse dargestellt.The valve according to the invention can be constructed as a seat or blind hole nozzle. The openings 7 of a blind hole nozzle are arranged in a blind hole, which is located in the closed position of the valve below the valve needle tip 4 in the valve body 3. In seat hole nozzles, the beginning of the openings 7 is in the valve body inner wall 6, that they are largely covered by the valve needle tip 4 with the nozzle closed. In FIG. 1 an embodiment of the valve according to the invention is shown as a seat hole nozzle.

Claims (7)

  1. Valve having a valve needle (2) which is axially movable in a bore (5) of a valve body (3) and which has a conical valve needle tip (4) at one end thereof, with the valve needle tip (4) comprising a radial valve sealing surface (9) which, in the closed position of the valve, comes into contact with a conical valve body inner wall (6) at the closed end of the bore (5), with at least one opening (7) being arranged in the conical valve body inner wall (6), which opening (7) connects the bore (5) to the outside (8) of the valve body (3), with the valve comprising two radial recesses (12, 13, 16, 17) which are arranged in the valve needle tip (4) or in the valve body inner wall (6), with one of the radial recesses (13, 17) being situated upstream (10) of the position of the valve sealing surface (9), and the other radial recess (12, 16) being situated downstream (11) of the position of the valve sealing surface (9) and upstream (10) of the at least one opening (7), in the closed position of the valve, characterized in that the conical valve needle tip (4) comprises a lateral surface with at least three regions which have different cone angles (δ1, δ2, δ3) and which, in the closed position of the valve, are separated from one another in each case by one of the two radial recesses (12, 13, 16, 17), with the cone angles (δ1, δ2, δ3) of the three regions increasing in magnitude in the downstream direction (11).
  2. Valve according to Claim 1, characterized in that the conical valve body inner wall (6) comprises at least two regions with different cone angles, with the cone angles increasing in magnitude in the upstream direction (10).
  3. Valve according to Claim 1, characterized in that both radial recesses are arranged in the valve needle tip (4) or in the valve body inner wall (6) or in that one radial recess (16, 17) is arranged in the valve needle tip (4) and one is arranged in the valve body inner wall (6).
  4. Valve according to Claim 1, characterized in that the recesses (12, 13, 16, 17) have a cross section which has the shape of a circular segment (groove), of a circular sector, of a triangle, square or other polygon or combinations thereof.
  5. Valve according to Claim 1, characterized in that the valve is a fuel injection nozzle, preferably in auto-ignition internal combustion engines.
  6. Valve according to Claim 5, characterized in that the auto-ignition internal combustion engines comprise common rail diesel injection.
  7. Valve according to Claim 1, characterized in that the valve is designed as a seat nozzle or blind hole nozzle.
EP02732350A 2001-05-10 2002-03-23 Valve comprising radial recesses Expired - Lifetime EP1387950B1 (en)

Applications Claiming Priority (3)

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DE10122503A DE10122503A1 (en) 2001-05-10 2001-05-10 Valve with radial recesses
DE10122503 2001-05-10
PCT/DE2002/001081 WO2002090761A1 (en) 2001-05-10 2002-03-23 Valve comprising radial recesses

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EP1387950A1 EP1387950A1 (en) 2004-02-11
EP1387950B1 true EP1387950B1 (en) 2010-01-13

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EP (1) EP1387950B1 (en)
JP (1) JP4157384B2 (en)
CN (1) CN1462342A (en)
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DE10122503A1 (en) 2002-11-21
DE50214168D1 (en) 2010-03-04
PL358462A1 (en) 2004-08-09
JP4157384B2 (en) 2008-10-01
US20040056118A1 (en) 2004-03-25
JP2004519604A (en) 2004-07-02
EP1387950A1 (en) 2004-02-11
CN1462342A (en) 2003-12-17
US7000856B2 (en) 2006-02-21

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