WO2009141839A1 - Ensemble de soupape pour soupape d’injection et soupape d’injection - Google Patents

Ensemble de soupape pour soupape d’injection et soupape d’injection Download PDF

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Publication number
WO2009141839A1
WO2009141839A1 PCT/IT2008/000333 IT2008000333W WO2009141839A1 WO 2009141839 A1 WO2009141839 A1 WO 2009141839A1 IT 2008000333 W IT2008000333 W IT 2008000333W WO 2009141839 A1 WO2009141839 A1 WO 2009141839A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
surface coating
needle
carbon layer
valve assembly
Prior art date
Application number
PCT/IT2008/000333
Other languages
English (en)
Inventor
Paolo Bertini
Salvatore Varchetta
Original Assignee
Continental Automotive Italy S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive Italy S.P.A. filed Critical Continental Automotive Italy S.P.A.
Priority to PCT/IT2008/000333 priority Critical patent/WO2009141839A1/fr
Publication of WO2009141839A1 publication Critical patent/WO2009141839A1/fr

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Classifications

    • 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
    • F02M61/166—Selection of particular materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0605—Carbon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0635—Carbides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/341—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one carbide layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/347—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with layers adapted for cutting tools or wear applications
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • 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

Definitions

  • Valve assembly for an injection valve and injection valve
  • the invention relates to a valve assembly for an injection valve and an injection valve.
  • Injection valves are in widespread use, in particular for an internal combustion engine where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter, and all the various elements of the injection valve being responsible for the way the fluid is dosed may vary in a wide range.
  • injection valves can accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator or a piezoelectric actuator.
  • the respective injection valve may be suited to dose fluids under high pressures.
  • the pressures may be in case of a gasoline engine, for example, in the range of up to 200 bar.
  • the object of the invention is to create a valve assembly for an injection valve and an injection valve which is simple to be manufactured and which facilitates a reliable and precise function. This object is achieved by the features of the independent claims. Advantageous embodiments of the invention are given in the sub-claims.
  • the invention is distinguished concerning a first aspect of the invention by a valve assembly of an injection valve, the valve assembly comprising a valve body including a central longitudinal axis, the valve body comprising a cavity and a needle seat, the cavity having a fluid inlet portion, and a fluid outlet portion, and a valve needle axially movable in the cavity comprising a seat part with a sealing portion, the sealing portion resting on the needle seat in the closing position, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions.
  • at least the sealing portion of the valve needle comprises a first surface coating comprising an amorphous carbon layer and at least the needle seat of the valve body comprises a second surface coating comprising a tungsten carbide-carbon layer.
  • LPG Liquefied Petroleum Gas
  • the protection of the base steel from the aggression of acids caused by the presence of contaminants in the LPG injector and humidity within the injection valve may be provided in a reliable way.
  • the injection valve may be protected against corrosion caused by sulfuric acid formed within the LPG injector.
  • the tungsten carbide- carbon layer may form the top layer of the surface coating of the valve body and the amorphous carbon layer may form the top layer of the surface coating of the valve needle to enable a protection against corrosion in an especially reliable way.
  • the tungsten carbide-carbon layer comprises globular islands of tungsten carbides in a matrix of carbon and hydrogen. Therefore, protection against chemical corrosion may be provided in a reliable way since there are no preferential paths for chemicals to penetrate up to the substrate.
  • the amorphous carbon layer comprises a matrix of mixed sp2 - graphite-like atomic bonds and sp3 - diamond-like atomic bonds of carbon with globular islands of tungsten carbides.
  • the amorphous structure comprises a porosity of nearly zero.
  • the diamond-like carbon layer provides protection against galvanic corrosion since it is electrically non-conductive.
  • the tungsten carbide-carbon layer and the diamond like carbon layer comprise low friction characteristics, which enable the protection against mechanical wear in an especially reliable way.
  • the invention was based on the finding that in the case of two components, which come in contact by mechanical impacts and wherein each component is coated with an amorphous carbon layer at the contact area as protection against corrosion, the coating might flake since the diamond like carbon layer is relatively brittle. Since the sealing portion rests on the needle seat in the closing position of the valve needle, an especially reliable operation of the valve assembly may be enabled by coating one part with the tungsten carbide-carbon layer providing some kind of flexibility and the other part with the amorphous carbon layer. By this, the prevention of corrosion for both parts may be enabled in a reliable way while both parts may also be protected against wearing. Consequently, a high life-time of the valve assembly is possible.
  • the invention is distinguished concerning a second aspect of the invention by a valve assembly of an injection valve, the valve assembly comprising a valve body including a central longitudinal axis, the valve body comprising a cavity and a needle seat, the cavity having a fluid inlet portion, and a fluid outlet portion, and a valve needle axially movable in the cavity comprising a seat part with a sealing portion, the sealing portion resting on the needle seat in the closing position, the valve needle preventing a fluid flow through the fluid outlet portion in a closing position and releasing the fluid flow through the fluid outlet portion in further positions.
  • the needle seat of the valve body comprises a first surface coating comprising an amorphous carbon layer and at least the sealing portion of the valve needle comprises a second surface coating comprising a tungsten carbide-carbon layer.
  • the first surface coating is formed on the valve body instead of the valve needle and the second surface coating is formed on the valve needle instead of the valve body.
  • the tungsten carbide-carbon layer may form the top layer of the surface coating of the valve needle and the amorphous carbon layer may form the top layer of the surface coating of the valve body.
  • the first surface coating and/or the second surface coating comprise a chromium layer.
  • the chromium layer can form an adhesive layer of the first surface coating and/or the second surface coating for mechanically coupling the surface coating to the valve needle or the valve body, for example to the base metal of the valve needle or the valve body, for instance stainless steel.
  • the chromium layer may form the bottom layer of the first surface coating and/or the second surface coating.
  • the first surface coating and/or the second surface may be bound to the valve needle or the valve body in an especially reliable way.
  • the first surface coating comprises the tungsten carbide-carbon layer.
  • the tungsten carbide-carbon layer can form a resistance layer for mechanical stresses and may also form a secondary shield against chemical corrosion.
  • the tungsten carbide-carbon layer comprises globular islands of tungsten carbides in a matrix of carbon and hydrogen.
  • protection against chemical corrosion may be provided in an especially reliable way since there are no preferential paths for chemicals to penetrate up to the substrate.
  • the second surface coating comprises a chromium nitride layer.
  • the chromium nitride layer can form a main resistance layer for mechanical stresses. Therefore, especially reliable operation of the valve assembly may be enabled.
  • the first surface coating comprising the amorphous carbon layer is applied by chemical vapor deposition.
  • the coating of the valve needle or the valve body with a multi-layered carbon-based hard coating with for instance the amorphous carbon layer forming the top layer may be enabled.
  • the application of the coating may be the last step of the production process such that there is no further machining of the component after the coating is applied.
  • the second surface comprising the tungsten carbide-carbon layer is applied by physical vapor deposition.
  • the coating of the valve needle or the valve body with a multi-layered carbon-based hard coating with for instance the tungsten carbide-carbon layer forming the top layer may be enabled.
  • the application of the coating may be the last step of the production process such that there is no further machining of the component after the coating is applied.
  • the first surface coating and/or the second surface coating have a thickness of approximately 1.5 ⁇ m up to 3 ⁇ m. This has the advantage that the thickness of the surface coating is sufficient to obtain good conditions against corrosion and mechanical robustness in a reliable way by limiting the internal stress in the coating which is a growing function of is thickness. Furthermore, there may be only small changes of the geometrical conditions of the valve needle and/or the valve body. For example, the first surface coating of the valve needle and the second surface coating of the valve body may have a thickness of around 2.2 ⁇ m.
  • the invention is distinguished concerning a third aspect of the invention by an injection valve with a housing, an actuator unit and a valve assembly of the first or second aspect of the invention.
  • FIG. 2 an enlarged and detailed view of an exemplary embodiment of a valve assembly of the injection valve in a longitudinal section view
  • An injection valve 2 (figure 1) that may be in particular suitable for a Liquefied Petroleum Gas (LPG) injector for dosing fluid to an internal combustion engine comprises a valve assembly 4 and a housing 6.
  • LPG Liquefied Petroleum Gas
  • the valve assembly 4 comprises a valve body 8 with a central longitudinal axis L and a cavity 10 which takes in a valve needle 12.
  • the valve body 8 comprises a pole piece 14.
  • the valve needle 12 comprises an armature 16.
  • a recess 18 is provided in the pole piece 14 and in the armature 16.
  • a spring 20 is arranged in the recess 18 of the pole piece 14 and the armature 16.
  • the spring 20 is mechanically coupled to the needle 12.
  • An adjusting tube 24 may be axially moved during the manufacturing process of the fluid injection valve 2 in order to preload the spring 20 in a desired way.
  • valve body 8 In a closing position of the valve needle 12, it sealingly rests on a needle seat 26 (figure 2) of a seat body 28, by this preventing a fluid flow through at least one injection nozzle 30.
  • the injection nozzle 30 may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the valve body 8 comprises the seat body 28, which may be made in one part with the valve body 8. Alternatively, it may be a separate part. Furthermore, the seat body 28 may be designed and arranged for guiding the needle 12 and for giving the fluid a radial velocity component .
  • the valve body 8 comprises an upper guide element 32 for guiding the valve needle 12, in particular the armature 16 of the valve needle 12.
  • the injection valve 2 is provided with an actuator unit 34 that comprises preferably an electromagnetic actuator.
  • the actuator unit 34 may, however, also comprise another type of actuator, which is known to persons skilled in the art for that purpose.
  • the valve assembly 4 has a fluid inlet portion 36 which is provided in the valve body 8.
  • the fluid inlet portion 36 communicates with a fluid outlet portion 38 which is part of the cavity 10 near the seat body 28.
  • the valve needle 12 has a seat part 40 (figure 2) being adjacent to the seat body 28.
  • the seat part 40 has a sealing portion 42.
  • the sealing portion 42 rests on the needle seat 26.
  • At least the sealing portion 42 of the valve needle 12 has a surface coating.
  • the sealing portion 42 of the valve needle 12 comprises a first surface coating 44 (figure 3) .
  • the first surface coating 44 has a thickness of approximately 1.5 ⁇ m up to 3 ⁇ m.
  • the first surface coating 44 has a thickness of around 2.2 ⁇ m.
  • the needle seat 26 of the valve body 8 has a surface coating.
  • the needle seat 26 of the valve body 8 comprises a second surface coating 46 (figure 4).
  • the second surface coating 46 has a thickness of approximately 1.5 ⁇ m up to 3 ⁇ m.
  • the second surface coating 46 has a thickness of around 2.2 ⁇ m.
  • At least the needle seat 26 of the valve body 8 may comprise the first surface coating 44 and at least the sealing portion 42 of the valve needle 12 may comprise the second surface coating 46.
  • the fluid is led from the fluid inlet portion 36 into the injection valve 2 to the fluid outlet portion 38.
  • the spring 20 forces the valve needle 12 towards the actuator unit 34.
  • the spring 20 can force the valve needle 12 to move in axial direction in its closing position. It is depending on the force balance between the force on the valve needle 12 caused by the actuator unit 34 and the force on the valve needle 12 caused by the spring 20 whether the valve needle 12 is in its closing position or not.
  • the seat part 40 of the valve needle 12 sealingly rests on the needle seat 26 of the seat body 28 and consequently a fluid flow through the fluid outlet portion 38 and the injection nozzle 30 is prevented.
  • the actuator unit 34 may exert a force on the valve needle 12.
  • the valve needle 12 is able to move in axial direction out of the closing position. Outside of the closing position of the valve needle 12, there is a gap between the seat body 28 and the valve needle 12 which enables a fluid flow through the injection nozzle 30.
  • the movement of the valve needle 12 results in an impact of the valve needle 12 on the valve body 8.
  • the seat part 40 of the valve needle 12 forms an impact section relative to the needle seat 26 of the seat body 28.
  • the sealing portion 42 of the valve needle 12 and the needle seat 26 of the valve body 8 protection against corrosion and good wearing characteristics of the seat part 40 of the valve needle 12 and the seat body 28 can be obtained.
  • the friction coefficient between the valve needle 12 and the valve body 8 is very low. By this, leakage failures of the valve assembly 4 can be kept low and a high lifetime of the valve assembly 4 is possible.
  • Figure 3 shows the first surface coating 44.
  • the valve needle 12 comprises the first surface coating 44.
  • the first surface coating 44 is built up as a stack of layers, preferably as a stack of three layers.
  • the first surface coating 44 comprises an amorphous carbon layer 50, preferably forming the top layer of the first surface coating 44.
  • the first surface coating 44 has a chromium layer 52, which forms an adhesive layer of the first surface coating 44 to mechanically coupling the first surface coating 44 to the valve needle 12.
  • the first surface coating 44 comprises a tungsten carbide-carbon layer 54.
  • the valve needle 12 may be coated with the first surface coating 44 by chemical vapor deposition.
  • the first surface coating 44 has a thickness of approximately 1.5 ⁇ m up to 3 ⁇ m.
  • the first surface coating 44 has a thickness of around 2.2 ⁇ m.
  • the valve body 8 may comprise the first surface coating 44.
  • Figure 4 shows the second surface coating 46.
  • the valve body 8 comprises the second surface coating 46.
  • the second surface coating 46 is built up as a stack of layers, preferably as a stack of three layers.
  • the second surface coating 46 comprises the tungsten carbide-carbon layer 54, preferably forming the top layer of the second surface coating 46.
  • the second surface coating 46 has the chromium layer 52, which forms an adhesive layer of the second surface coating 46 to mechanically coupling the second surface coating 46 to the valve body 8.
  • the second surface coating 46 comprises a chromium nitride layer 56.
  • the valve body 8 may be coated with the second surface coating 46 by physical vapor deposition.
  • the second surface coating 46 has a thickness of approximately 1.5 ⁇ m up to 3 ⁇ m.
  • the second surface coating 46 has a thickness of around 2.2 ⁇ m.
  • valve needle 12 may comprise the second surface coating 46.
  • first surface coating 44 and the second surface coating 46 enable to obtain a good result for protection against corrosion and also for wearing conditions of the valve needle 12 and the valve body 8 and the sliding conditions between the valve needle 12 and the valve body 8 in connection with only small changes of the geometry of the valve needle 12 or the valve body 8.
  • first surface coating 44 and the second surface coating 46 may comprise additional layers.
  • the injection valve 2 may comprise an alternative shape.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

La présente invention concerne un ensemble de soupape (4) d’une soupape d’injection (2), l’ensemble de soupape (4) comportant un corps de soupape (8) comprenant un axe longitudinal central (L), le corps de soupape (8) comprenant une cavité (10) et un siège d’aiguille (26), la cavité(10) ayant une partie d’orifice d’admission de fluide (36), et une partie d’orifice de sortie de fluide (38), et une aiguille de soupape (12) axialement mobile dans la cavité (10) comportant une partie de siège (40) avec une partie d’étanchéité (42). La partie d’étanchéité (42) repose sur le siège d’aiguille (26) dans la position fermée, l’aiguille de soupape (12) interdisant un écoulement de fluide à travers la partie d’orifice de sortie de fluide (38) dans une position de fermeture et permettant l’écoulement de fluide à travers la partie d’orifice de sortie de fluide (38) dans d’autres positions. Au moins la partie d’étanchéité (42) de l’aiguille de soupape (12) comporte un premier revêtement de surface (44) comprenant une couche de carbone amorphe (50) et au moins le siège d’aiguille (26) du corps de soupape (8) comportant un second revêtement de surface (46) comprenant une couche de carbure de tungstène/carbone (54).
PCT/IT2008/000333 2008-05-19 2008-05-19 Ensemble de soupape pour soupape d’injection et soupape d’injection WO2009141839A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2008/000333 WO2009141839A1 (fr) 2008-05-19 2008-05-19 Ensemble de soupape pour soupape d’injection et soupape d’injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2008/000333 WO2009141839A1 (fr) 2008-05-19 2008-05-19 Ensemble de soupape pour soupape d’injection et soupape d’injection

Publications (1)

Publication Number Publication Date
WO2009141839A1 true WO2009141839A1 (fr) 2009-11-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110318926A (zh) * 2018-03-29 2019-10-11 罗伯特·博世有限公司 喷射器及其阀座

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0818622A1 (fr) * 1996-07-11 1998-01-14 Ford Global Technologies, Inc. L'utilisation d'un injecteur de combustible revêtu et procédé de fabrication
WO2001061182A1 (fr) * 2000-02-15 2001-08-23 Caterpillar Inc. Revetements de films fin pour composants d'injecteur
EP1150004A2 (fr) * 2000-04-28 2001-10-31 Delphi Technologies, Inc. Soupape d'injection de combustible revêtue

Patent Citations (3)

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WO2001061182A1 (fr) * 2000-02-15 2001-08-23 Caterpillar Inc. Revetements de films fin pour composants d'injecteur
EP1150004A2 (fr) * 2000-04-28 2001-10-31 Delphi Technologies, Inc. Soupape d'injection de combustible revêtue

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CN110318926A (zh) * 2018-03-29 2019-10-11 罗伯特·博世有限公司 喷射器及其阀座

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