EP2971749B1 - Soupape de commande de fluide à étanchéité renforcée - Google Patents

Soupape de commande de fluide à étanchéité renforcée Download PDF

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Publication number
EP2971749B1
EP2971749B1 EP14700722.3A EP14700722A EP2971749B1 EP 2971749 B1 EP2971749 B1 EP 2971749B1 EP 14700722 A EP14700722 A EP 14700722A EP 2971749 B1 EP2971749 B1 EP 2971749B1
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EP
European Patent Office
Prior art keywords
region
valve
valve seat
sealing
hardness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14700722.3A
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German (de)
English (en)
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EP2971749A1 (fr
Inventor
Fatima Mutlu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2971749A1 publication Critical patent/EP2971749A1/fr
Application granted granted Critical
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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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • 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
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0024—Valves characterised by the valve actuating means electrical, e.g. using solenoid in combination with permanent magnet

Definitions

  • the present invention relates to a valve for controlling a fluid, in particular a fuel injection valve, with an increased tightness in the closed state of the valve.
  • Valves for controlling fluids are known from the prior art, for example as injectors.
  • a closing element releases or closes injection holes, which are formed in a valve seat.
  • the closing movement of the closing element is a pushing movement. This should be done with the valve closed, i.
  • the closing element rests against the valve seat, no fuel leak through leakage, as this unburned fuel can get into the exhaust system of an internal combustion engine.
  • formation of particles e.g. be avoided by abrasion, which can lead to damage to the valve and / or other components of an internal combustion engine. Since valves are usually mass components, a solution to this problem should be such that the valve has the highest possible tightness suitable for mass production.
  • a valve for controlling a fluid, in particular fuel which includes a closing element and a valve seat, the valve seat having a sealing area and a valve seating area adjoining the sealing area, and wherein the closing element seals at the sealing area and the sealing area and the valve seat area directly and steplessly merge into one another and a hardness of the sealing region of the valve seat is smaller than a hardness of the closing element.
  • the closing element and the valve seat are made of different stainless martensitic steels.
  • a fuel injection valve for injecting gaseous fuel into a combustion chamber having a fuel passage, a needle, and a valve body is already known.
  • the needle has a seal member and a downstream-side concavity portion disposed in a fuel flow direction downstream of the seal member.
  • the valve body has a body upstream obstruction portion and a body downstream obstruction portion disposed downstream of the body upstream obstruction portion in the fuel flow direction.
  • the seal member is connected to or separated from the body upstream fitting portion to close or open the fuel passage, and the downstream needle fitting portion is connected to or separated from the body downstream fitting portion to close or open the fuel passage. In a process for closing the fuel passage, the seal member comes into contact with the body upstream fitting portion, and then the needle downstream fitting portion comes into contact with the body downstream fitting portion.
  • valve seat cooperates with a closing element which serves to close or release a fluid flow under high pressure.
  • the valve seat is coated with a shape memory alloy coating.
  • valve according to the invention for controlling a fluid with the features of claim 1 has the advantage that a tightness of the valve can be significantly improved.
  • valve according to the invention is easily and inexpensively produced by mass production.
  • the valve according to the invention has a particularly simple and inexpensive and easy to manufacture construction.
  • the valve has a closing element and a valve seat, wherein the valve seat has a sealing area and a valve seat area adjoining the sealing area.
  • the closing element seals at the sealing area when the valve is in the closed state.
  • the sealing region and the valve seat region merge into one another directly and without transition, ie there is no step or step or the like between the sealing region and the valve seat region.
  • a hardness of the sealing area is smaller than a hardness of the closing element.
  • a hardness difference between the sealing area and the closing element is selected such that no plastic deformation takes place when closing the valve.
  • the valve according to the invention still has sufficient tightness, since no plastic deformation at the sealing region of the valve seat are present. In operation occurs at most an elastic deformation in the closed state of the valve, which, however, is reversed immediately after lifting the closing element from the sealing area. In other words, a plastic deformation of the sealing area is prevented by the closing element, so that the tightness properties of the valve are still sufficiently available even after prolonged operation.
  • a sealing line in particular a circular sealing line, is present in the closed state of the valve between the closing element and the sealing area.
  • the closing element is a ball and / or the valve seat is a conical surface.
  • the valve seat region has a hardness which is greater than a hardness of the sealing region. More preferably, a hardness of the valve seat portion is also less than a hardness of the closing element. By comparison with the Sealing area harder valve seat area can be ensured that the necessary strength requirements can be met easily on the valve seat.
  • the invention comprises the sealing region an annular, elastomeric sealing element, which is arranged in a groove in the valve seat.
  • a cross section of the elastomeric sealing element is quadrangular, in particular rectangular.
  • a transition-free transition between sealing area and valve seat area can be ensured.
  • a cohesive connection is formed between the sealing area and the valve seat area.
  • the valve seat is an MIM component (metal injection molded component), wherein the sealing region and the valve seat region are made of different materials.
  • a guide region for guiding the closing element is directly adjacent to the sealing region, wherein the guiding region has a hardness which is also smaller than a hardness of the closing element.
  • the hardnesses of the guide area and the sealing area are the same, and more preferably the guide area and the sealing area are made of the same materials.
  • a particularly high tightness can be achieved if a thickness of the sealing region has approximately one third of a thickness of the valve seat. The thickness of the sealing area and the valve seat is determined, starting from a sealing line between the closing element and sealing area, perpendicular to the surface.
  • a material of the sealing area and a material of the closing element and / or a material of the sealing area and a material of the valve seat area are chosen such that these materials are provided in powder form (in particular as a feedstock) after molding, for example by means of powder injection molding, a heat treatment with be subjected to the same temperature and thereby the hardness differences of sealing area and closing element and / or sealing area and valve seat area are obtained.
  • the valve according to the invention is particularly preferably a solenoid valve for controlling fuel in a fuel injection.
  • the solenoid valve according to the invention may be designed as a suction pipe injection valve or as a direct injection valve.
  • valve seat has a plurality of spray holes, which can be arranged by the present invention on a spray hole diameter, which is significantly smaller than a spray hole diameter in the prior art.
  • FIGS. 1 to 3 an injection valve 1 according to a first preferred embodiment of the invention described in detail.
  • the injection valve 1 comprises a valve housing 8, a magnet armature 13, a coil 14 and an inner pole 16.
  • a closing spring 15 is provided to close the injection valve after the injection again.
  • the reference numeral 17 denotes an electrical connection.
  • a closing element 2 is provided in the form of a ball, wherein the ball is in communication with a valve needle 12, on which the armature 13 is arranged.
  • the closing element 2 seals off at a valve seat 3, which in detail in the FIGS. 2 and 3 is shown.
  • the valve seat 3 is conical in this embodiment.
  • the valve seat 3 comprises a sealing region 4 and a valve seat region 5 adjacent to the sealing region 4.
  • the sealing region 4 is annularly formed on the valve seat 3 and has a rectangular cross-section (cf. FIG. 3 ).
  • the valve seat 5 is provided on both sides of the sealing portion 4.
  • a plurality of injection holes 6 are formed on the valve seat, via which fuel can be injected into a combustion chamber or the like.
  • the injection holes 6 are formed step-shaped.
  • a guide portion 7 is provided, on which the closing element 2 is guided. As a result, a fast and safe closing of the valve is achieved.
  • FIGS. 1 to 3 each show the closed state of the valve. Therefore it forms, as if FIG. 3 it can be seen, between the closing element 2 and the sealing region 4 of the valve seat 3, a line-shaped sealing line 9 from.
  • a hardness of the closing element 2 is selected such that the closing element 2 has a greater hardness than the sealing region 4.
  • the valve seat region 5, which directly adjoins the sealing region 4 has a greater hardness than the sealing region 4.
  • the hardness of the valve seat portion 5 is smaller than the hardness of the closing element 2.
  • the hardness of the closing element 2, the sealing portion 4 and the valve seat portion 5 can be determined by known methods (eg according to Vickers).
  • the valve seat 3 of the first exemplary embodiment is produced by means of MIM technology, wherein different materials are used for the sealing region 4 and the valve seat region 5, respectively. This results in a cohesive connection 10, between the sealing region 4 and the valve seat region 5, which in FIG. 3 is indicated by the dashed line.
  • a thickness D1 of the sealing region 4 perpendicular to the surface of the valve seat is approximately one third of a total thickness D2 of the valve seat 3. Furthermore, there is no step between the sealing region 4 and the valve seat region 5, so that the sealing region and the valve seat region directly and continuously merge.
  • the choice according to the invention of the different hardnesses between closing element 2 and sealing area 4 ensures that an improved tightness of the valve in the closed state is possible.
  • shock pulses which occur due to a closing operation of the valve, are absorbed and also a noise level is reduced.
  • a slight, elastic deformation on the sealing area 4 occur, which is, however, reversed after lifting the closing element 2.
  • a reduced wear can be obtained, so that a defined, optimized surface finish on the sealing region 4 can be retained longer.
  • valve seat 3 can be ensured by the use of the MIM method.
  • the invention also reduces a component load, so that the injection holes 6 can be arranged closer to each other and in particular a seat diameter of the injection holes 6 smaller can be chosen. This results in the further advantage that thereby lower magnetic forces are required for opening, so that the magnetic circuit can be designed more cost-effective, and in particular a power requirement of the magnetic circuit is reduced to open.
  • FIG. 4 shows a valve 1 according to a second preferred embodiment of the invention.
  • the sealing portion of the valve is formed by an elastomeric sealing member 20.
  • the sealing element 20 has a rectangular cross-section and is arranged in a groove 21 in the valve seat 3.
  • the sealing area is arranged in a form-fitting manner in the valve seat 3.
  • a paragraph-free transition between sealing area 4 and valve seat area 5 is present on the side facing the closing element 2 side.
  • FIG. 5 shows a valve 1 according to a third embodiment of the invention.
  • the third embodiment differs from the first embodiment in that a guide region 27 directly adjoins the sealing region 4.
  • the guide region 27 also has a different hardness than a hardness of the closing element 2.
  • a hardness of the guide region 27 and the sealing region 4 are particularly preferred.
  • the sealing area 4 and the guide area 27 can also be produced in one step together with the valve seat 3 by means of an MIM method.
  • a different metal powder is used for the guide region 27, so that in the finished component then the sealing region 4 and the guide portion 27 have different hardnesses.
  • a thickness of the sealing portion 4 and the guide portion 27 is preferably the same.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)

Claims (7)

  1. Soupape de commande d'un fluide, en particulier de carburant, comprenant
    - un élément de fermeture (2) et
    - un siège de soupape (3),
    - le siège de soupape (3) présentant une région d'étanchéité (4) et une région de siège de soupape (5) adjacente à la région d'étanchéité (4),
    - l'élément de fermeture (2) réalisant l'étanchéité au niveau de la région d'étanchéité (4),
    - une dureté de la région d'étanchéité (4) étant inférieure à une dureté de l'élément de fermeture (2) et
    la région d'étanchéité (4) étant un élément d'étanchéité élastomère annulaire (20) qui est disposé dans une rainure (21) dans le siège de soupape (3),
    caractérisée en ce que la région d'étanchéité (4) et la région de siège de soupape (5) se prolongent directement et sans gradin l'une dans l'autre et une région de guidage (27) pour guider l'élément de fermeture (2) pendant son déplacement axial est prévue, la région de guidage (27) présentant une dureté qui est inférieure à une dureté de l'élément de fermeture (2) et la région de guidage (27) présentant notamment une dureté qui est supérieure à une dureté de la région d'étanchéité (4).
  2. Soupape selon la revendication 1, caractérisée en ce qu'une différence de dureté entre la région d'étanchéité (4) et l'élément de fermeture (2) est choisie de telle sorte que la fermeture de la soupape s'effectue sans déformation plastique au niveau de la région d'étanchéité (4).
  3. Soupape selon l'une quelconque des revendications précédentes, caractérisée en ce qu'entre la région d'étanchéité (4) et l'élément de fermeture (2), dans l'état fermé de la soupape, est réalisée une ligne d'étanchéité (9).
  4. Soupape selon l'une quelconque des revendications précédentes, caractérisée en ce que la région de siège de soupape (5) présente une dureté qui est supérieure à une dureté de la région d'étanchéité (4) et/ou qui est inférieure à une dureté de l'élément de fermeture (2).
  5. Soupape de commande d'un fluide, en particulier de carburant, comprenant
    - un élément de fermeture (2) et
    - un siège de soupape (3),
    - le siège de soupape (3) présentant une région d'étanchéité (4) et une région de siège de soupape (5) adjacente à la région d'étanchéité (4),
    - l'élément de fermeture (2) réalisant l'étanchéité au niveau de la région d'étanchéité (4),
    - une dureté de la région d'étanchéité (4) étant inférieure à une dureté de l'élément de fermeture (2) et
    un assemblage par liaison de matière (10) étant réalisé entre la région d'étanchéité (4) et la région de siège de soupape (5), et le siège de soupape (3) étant un composant MIM et la région d'étanchéité (4) et la région de siège de soupape (5) étant fabriquées à partir de matériaux MIM différents,
    caractérisée en ce que la région d'étanchéité (4) et la région de siège de soupape (5) se prolongent directement et sans gradin l'une dans l'autre et une région de guidage (27) pour guider l'élément de fermeture (2) pendant son déplacement axial est prévue, la région de guidage (27) présentant une dureté qui est inférieure à une dureté de l'élément de fermeture (2) et la région de guidage (27) présentant notamment une dureté qui est supérieure à une dureté de la région d'étanchéité (4).
  6. Soupape selon l'une quelconque des revendications précédentes, caractérisée en ce qu'une épaisseur (D1) de la région d'étanchéité (4) vaut approximativement un tiers de l'épaisseur (D2) du siège de soupape (3) au niveau de la région d'étanchéité (4).
  7. Soupape selon l'une quelconque des revendications précédentes, caractérisée en ce que la soupape est réalisée sous forme d'électrovanne.
EP14700722.3A 2013-03-11 2014-01-17 Soupape de commande de fluide à étanchéité renforcée Active EP2971749B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013204152.7A DE102013204152A1 (de) 2013-03-11 2013-03-11 Ventil zum Steuern eines Fluids mit erhöhter Dichtheit
PCT/EP2014/050886 WO2014139706A1 (fr) 2013-03-11 2014-01-17 Soupape de commande de fluide à étanchéité renforcée

Publications (2)

Publication Number Publication Date
EP2971749A1 EP2971749A1 (fr) 2016-01-20
EP2971749B1 true EP2971749B1 (fr) 2019-03-13

Family

ID=49989779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14700722.3A Active EP2971749B1 (fr) 2013-03-11 2014-01-17 Soupape de commande de fluide à étanchéité renforcée

Country Status (7)

Country Link
US (1) US10125735B2 (fr)
EP (1) EP2971749B1 (fr)
JP (1) JP6297608B2 (fr)
KR (1) KR20150130292A (fr)
CN (1) CN105008710B (fr)
DE (1) DE102013204152A1 (fr)
WO (1) WO2014139706A1 (fr)

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
JP2021014791A (ja) * 2017-11-16 2021-02-12 日立オートモティブシステムズ株式会社 高圧燃料ポンプ
JP7193804B2 (ja) * 2019-06-05 2022-12-21 株式会社サタケ 圧電アクチュエータ、圧電式バルブ、及び圧電アクチュエータの製造方法
JP7300117B2 (ja) * 2019-06-28 2023-06-29 株式会社サタケ 圧電式バルブ及び該圧電式バルブの製造方法
DE102020208228A1 (de) * 2019-07-19 2021-01-21 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoff-Hochdruckpumpe

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EP2025924A2 (fr) * 2007-08-07 2009-02-18 Robert Bosch GmbH Elément d'aération et son procédé de fabrication
DE102012205564A1 (de) * 2011-04-05 2012-10-11 Denso Corporation Kraftstoffeinspritzventil

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JP2007177675A (ja) 2005-12-27 2007-07-12 Nippon Piston Ring Co Ltd ニードルバルブ用ニードルシールおよびニードルバルブ
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Publication number Priority date Publication date Assignee Title
EP2025924A2 (fr) * 2007-08-07 2009-02-18 Robert Bosch GmbH Elément d'aération et son procédé de fabrication
DE102012205564A1 (de) * 2011-04-05 2012-10-11 Denso Corporation Kraftstoffeinspritzventil

Also Published As

Publication number Publication date
KR20150130292A (ko) 2015-11-23
CN105008710B (zh) 2018-11-30
WO2014139706A1 (fr) 2014-09-18
US20160017855A1 (en) 2016-01-21
CN105008710A (zh) 2015-10-28
JP2016509162A (ja) 2016-03-24
DE102013204152A1 (de) 2014-09-11
JP6297608B2 (ja) 2018-03-20
EP2971749A1 (fr) 2016-01-20
US10125735B2 (en) 2018-11-13

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