EP1939515B1 - Joint haute tension - Google Patents

Joint haute tension Download PDF

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Publication number
EP1939515B1
EP1939515B1 EP20070122106 EP07122106A EP1939515B1 EP 1939515 B1 EP1939515 B1 EP 1939515B1 EP 20070122106 EP20070122106 EP 20070122106 EP 07122106 A EP07122106 A EP 07122106A EP 1939515 B1 EP1939515 B1 EP 1939515B1
Authority
EP
European Patent Office
Prior art keywords
pressure seal
bore
sealing
seal according
sealing pin
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.)
Not-in-force
Application number
EP20070122106
Other languages
German (de)
English (en)
Other versions
EP1939515A1 (fr
Inventor
Jens-Peter Nagel
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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1939515A1 publication Critical patent/EP1939515A1/fr
Application granted granted Critical
Publication of EP1939515B1 publication Critical patent/EP1939515B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means

Definitions

  • the invention relates to a high-pressure seal, in particular a high-pressure seal for a fuel injection valve and a fuel injection valve with such a high-pressure seal.
  • the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • a device with a piezoelectric actuator for a fuel injection valve is known.
  • the piezoelectric actuator has two end faces and two electrically conductive contact tracks, each of which passes through the actuator, starting from an end face.
  • the actuator is clamped between two metallic plates, each of which is arranged on an end face.
  • an electrically insulating insulating layer is arranged between each end face and the plate arranged there. Through one of the metallic plates, the electrically conductive contact paths are guided.
  • the from the WO 03/026033 A1 known device has the disadvantage that the seal against fuel under high pressure is limited. Unless the device is in an actuator space is used, is provided in the high-pressure fuel, there is the problem that compared to a non-pressurized outer side, to which the electrically conductive contact paths are guided, a high pressure difference occurs, which is difficult to seal.
  • holes through which the electrically conductive contact paths are made to be filled up with a glass enamel functioning as an insulator.
  • a metal body having the holes, and surrounding the bore of glass sleeves electrically conductive contact paths can be heated together to the melting point of the glass, wherein after a subsequent quenching the seal is formed, which results from the tension, the is due to the different thermal expansion coefficients of the materials.
  • the entire unit is then provided with a nickel-gold coating and is pressed in a conical bore from the high pressure side.
  • this system has the disadvantage that the handling is complex, since a variety of different manufacturing steps, additional complex contacts and possibly an additional isolation process to prevent an electrical short circuit or a voltage-induced flashover is required.
  • the seal may be damaged, in particular in the area of glass melting.
  • a closure device for sealing holes in which a sleeve has on its outer side a toothed region and the sleeve is inserted into a bore. To lock a Verpresselement is inserted into the sleeve, so that a positive connection of the sleeve takes place with the inside of the bore.
  • the high-pressure seal according to the invention with the features of claim 1 and the fuel injection valve according to the invention with the features of claim 13 have the advantage that a reliable high-pressure seal is created, which has a high mechanical stability and is also suitable for high pressures.
  • an arrangement of the high-pressure seal in which the high-pressure medium is provided on the second side, so that the force with which the collar is pressed against the body, increases with the pressure of the medium.
  • An additional sealing effect can also be formed by the positive connection between the helical profile of the sleeve and the body in the region of the bore by the helical profile additionally ensures a circumferential seal.
  • the pressing element is designed as a spherical pressing element.
  • the pressing element can be easily manufactured and also simply pressed into the blind bore of the sealing bolt.
  • the pressing element has a barrel-shaped injection body, which is pressed into the blind bore. Furthermore, it is advantageous for the pressing element to have a contact element which For example, designed as a rod-shaped contact plug.
  • the barrel-shaped configuration of the pressing body ensures the positioning of the contact element with respect to the blind bore, to allow the contacting of the contact element and to prevent, for example, short circuits. This results in many possibilities for contacting the contact element.
  • an electrically insulating insulating means which electrically isolates the sealing bolt against the body.
  • an embodiment of the sealing bolt and the body and possibly other elements made of metallic and thus electrically conductive materials is possible. This allows for a seal against high pressures with relatively inexpensive materials and on the other hand, a high media resistance, especially against fuel.
  • the insulating means is formed of an electrically insulating coating.
  • the electrically insulating coating is applied to the sealing bolt, which can be done relatively inexpensively.
  • the electrically insulating coating can be formed, for example, from Teflon.
  • the electrically insulating coating in a sealing region has a layer thickness which is not greater than an extrusion limit thickness. Especially in the sealing area occur relatively large forces, whereby an extrusion can occur.
  • the collar of the sealing bolt has a biting edge on which sealing bolts are pressed against the body.
  • the pressing can also be done indirectly, in particular via the insulating layer. This has the advantage that a defined seal is formed, which has a high pressure resistance, wherein a self-reinforcing seal is achieved by the application of the federal government of the sealing bolt with the fuel under high pressure.
  • the sealing bolt has a contact element which is formed by a blind bore.
  • a simple contacting of the high-pressure seal on the side of the sealing bolt is possible.
  • Other embodiments of the contact element are advantageous, for example, the configuration as a rod-shaped contact plug, which is provided on the side of the collar of the sealing bolt.
  • the bore provided in the body is designed as a stepped bore, wherein the sleeve is inserted at least substantially up to a step of the stepped bore in the stepped bore, so that the assembly of the high-pressure seal simplified and a reliable sealing effect is ensured in the assembled state ,
  • Fig. 1 shows a high-pressure seal 1 according to a first embodiment of the invention prior to assembly.
  • the high-pressure seal 1 is particularly suitable for a fuel injection valve 2, as it is also in Fig. 6 is shown schematically.
  • the high-pressure seal is used specifically for sealing a high-pressure fuel to atmospheric pressure, the high-pressure seal 1 allows the passage of electrical signals or electrical energy.
  • the high pressure seal 1 can serve to seal very high pressures, for example, about 200 MPa (2000 bar).
  • a preferred use of the fuel injection valve 2 is for a fuel injection system with a common rail, which leads diesel fuel under high pressure to a plurality of fuel injection valves 2.
  • the high-pressure seal 1 according to the invention and the fuel injection valve 2 according to the invention are also suitable for other applications.
  • the high-pressure seal 1 is used to seal a provided in a body 3 bore 4, which is designed as a stepped bore 4 and at least one stage 5 has.
  • the body 3 has a first side 6 and a second side 7 opposite the first side 6.
  • the high-pressure seal 1 is mounted so that a seal of the pressure acting on the second side 7 is ensured compared to the relatively low pressure on the first side 6.
  • the bore 4 has from the first side 6 forth to level 5 a diameter a, wherein a bevägter Section 8 may be provided.
  • a sleeve 9 is introduced from the first side 6, as illustrated by the arrows 10. Furthermore, the high-pressure seal 1 has a sealing bolt 11 and a compression element 12. The sleeve 9 is inserted into the bore 4 in such a way that the sleeve 9 is supported on the step 5. The sleeve 9 has on an outer side 13 a helical profile 14 which is inclined slightly against the insertion direction represented by the arrows 10.
  • Fig. 2 shows the high-pressure seal 1 in the partially assembled state, wherein the sleeve 9 is inserted into the bore 4.
  • An outer diameter of the outer side 13 of the sleeve 9 corresponds substantially to the diameter a of the bore 4 to the step 5.
  • the sleeve 9 also has a bore 15 which has a diameter b.
  • the bore 15 may already be formed prior to insertion of the sleeve 9. However, the bore 15 can be drilled only after the introduction of the sleeve 9 in the bore 4 to achieve an alignment of the bore 15 in the direction of an axis 16 of the high-pressure seal 1 with relatively high accuracy.
  • the sealing bolt 11 has a blind bore 19, which has an inner diameter d substantially. Of the Inner diameter d of the blind bore 19 is slightly smaller than an outer diameter c of the compression element 12, which is designed as a spherical compression element 12.
  • the pressing element 12 is inserted into the blind bore 19 after the assembly of the sealing bolt 11.
  • the sealing bolt 11 is expanded in the region of the blind bore 19, so that the diameter of the outer side 17 increases.
  • the sleeve 9 is also expanded, so that the helical profile 14 at least slightly penetrates into the body 3 and a positive connection between the sleeve 9 and the body 3 is created.
  • Fig. 3 shows the high-pressure seal 1 in the mounted state in which the pressing element 12 is inserted into the blind bore 19 of the sealing bolt 11. Due to the excess of the spherical compression element 12 to the inner diameter d of the blind bore 19 of the sealing pin 11 is deformed in the region of the blind bore 19 and thus also the sleeve 9 in the region of the helical gear 14, in particular.
  • the sealing bolt 11 is also partially coated with an electrically insulating coating 25 which constitutes an electrically insulating insulating means, which is an electrically insulating material or an electrically insulating material, between the sealing bolt 11 and the body 3.
  • the electrically insulating coating 25 prevents an electrical short circuit between the sealing bolt 11 and the body 4.
  • Fig. 4 shows the in Fig. 3 labeled IV section of the high pressure seal 1 of the first embodiment.
  • the sealing bolt 11 has in the region of an edge 26 of the body 3, which is formed through the bore 4 in the body 3 toward the second side 7, a recess 27, so that the sealing bolt 11 in the region of the edge 26 spaced from the body. 3 is.
  • the sealing surface 31 serves to seal against the fuel pressure, which generates a force F D in the region of the sealing edge 30.
  • the layer thickness h of the coating 25 is less than or equal to an extrusion limit thickness in order to prevent extrusion of the coating 25 on the sealing surface 31 by the applied pressure. The determination of the layer thickness h as extrusion boundary thickness is shown below by way of example.
  • the effective pressure surface A B of the sealing bolt 11 results from the in Fig. 3 illustrated outer diameter e of the collar 18 of the sealing bolt 11 and the Ludolph number ⁇ to:
  • a B ⁇ * e 2 / 4th
  • Factor 3 takes into account 3 times the safety. Instead of the factor 3, another factor may be chosen to generally specify a frictional force F x with x-fold certainty.
  • F x frictional force
  • the extrusion limit thickness given by the formula (10), in particular the formula (12), is to be understood as the maximum value which is maintained at least in the region of the sealing edge 30 in order to allow extrusion of the coating 25 in the region of the sealing edge 30 prevent.
  • the remaining coating 25, that is the coating 25 outside the sealing edge 30, may also have a different layer thickness.
  • the layer thickness h may be also smaller than the extrusion limit thickness determined by the formula (10).
  • the layer thickness h can be influenced within certain limits by the choice of the safety factor x, which is selected equal to 3 above, and the friction coefficient ⁇ 0 .
  • Fig. 5 shows the in Fig. 3 illustrated high-pressure seal 1 according to a second embodiment of the invention.
  • the designated IV section is according to the basis of the Fig. 4 designed neckline designed.
  • a plug or the like for contacting the high-pressure seal 1 on the second side can be inserted into the contact member 35.
  • a plug or the like can be used to allow contacting of the high-pressure seal 1 from the first side 6.
  • the contacting on the first side 6 and / or the second side 7 of the body 3 can also be done in other ways, for example by soldering.
  • Fig. 6 shows a simplified illustrated fuel injection valve 2 with a high-pressure seal 1 according to a third embodiment of the invention.
  • the section marked IV is in accordance with the in Fig. 4 designated neckline designed.
  • the body 3 is inserted into a valve housing 37 of the fuel injection valve 2.
  • the body 3 may also be part of the valve housing 37 or be formed integrally with the valve housing 37.
  • the fuel injection valve 2 has a simplified illustrated actuator 38, which is supplied to a fuel under high pressure via a line 39.
  • high-pressure fuel may also be located in a valve chamber 40.
  • the actuating device 38 is electrically contacted on the one hand with the contact element 35 of the high-pressure seal 1 and on the other hand with the body 3.
  • a control unit 44 is provided, which is contacted on the one hand with the compression element 12 and on the other hand with the body 3 electrically. Thereby, the passage of electrical energy through the valve housing 37 into the interior of the valve housing 37 to the actuator 38 is possible to actuate the fuel injection valve 2, wherein fuel can be sprayed off via a nozzle opening 41.
  • the pressing element 12 has a barrel-shaped pressing body 42 and a contact element 43. The barrel-shaped compression body 42 is pressed into the blind bore 19 in order to form a press connection between the sleeve 9 in the region of the helical profile 14 and the body 13.
  • the contact element 43 of the compression element 12 is designed as a rod-shaped contact plug to allow contacting by means of a socket with the control unit 44. Furthermore, the sealing bolt 11 has a contact element 35 designed as a contact plug in order to connect to the actuating device 38 by means of a bushing enable.
  • the barrel-shaped configuration of the compression body 42 and the arrangement of the sealing bolt 11 in the bore 15 thereby allow alignment of the contact element 43 of the compression element 12 and the contact element 35 of the sealing bolt 11 along the axis 16 of the high pressure seal. 1
  • a first high pressure resistant seal is formed. Furthermore, a second high-pressure resistant seal is formed by the positive connection between the helical profile 14 of the sleeve 9 and the body 3. These two seals ensure reliable operation of the high-pressure seal 1 in order to prevent leakage of the highly pressurized fuel from the valve housing 37 provided in the valve space 40.
  • a plurality of high pressure seals 1 may be provided to lead, for example, measurement signals from the interior of the valve housing 37 to the controller 44 or the like.

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

Claims (14)

  1. Joint haute pression (1), en particulier joint haute pression pour des soupapes d'injection de carburant, pour réaliser l'étanchéité d'un alésage (4) prévu dans un corps (3), comprenant une douille (9) qui présente sur un côté extérieur au moins en partie un profilé denté oblique (14), et un élément de pressage (12), la douille (9) étant insérée dans l'alésage (4) depuis un premier côté (6),
    caractérisé en ce que
    le joint haute pression présente un goujon d'étanchéité (11) avec au moins un alésage borgne (19), le boulon d'étanchéité (11) étant introduit dans la douille (9) depuis un deuxième côté (7) opposé au premier côté (6), un diamètre extérieur (c) de l'élément de pressage (12) étant supérieur à un diamètre intérieur (b) de l'alésage borgne (19) du goujon d'étanchéité (11), l'élément de pressage (12) étant pressé dans l'alésage borgne (19) du boulon d'étanchéité (11), de telle sorte qu'au moins un engagement par coopération de forme entre le profilé denté oblique (14) de la douille (9) et le corps (3) soit formé dans la région de l'alésage (4), et un épaulement (18) du goujon d'étanchéité (11) étant pressé au niveau du deuxième côté (7) au moins de manière indirecte contre le corps (3).
  2. Joint haute pression selon la revendication 1,
    caractérisé en ce que
    l'élément de pressage (12) est réalisé sous forme d'élément de pressage en forme de bille (12).
  3. Joint haute pression selon la revendication 1,
    caractérisé en ce que
    l'élément de pressage (12) présente un corps de pressage (42) en forme de tonneau, qui est pressé dans l'alésage borgne (19), et un élément de contact (43).
  4. Joint haute pression selon la revendication 3,
    caractérisé en ce que
    l'élément de contact (43) est réalisé sous forme de connecteur de contact en forme de barre.
  5. Joint haute pression selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce
    qu'un moyen d'isolation électriquement isolant (25) est prévu, lequel isole électriquement le goujon d'étanchéité (11) par rapport au corps (3).
  6. Joint haute pression selon la revendication 5,
    caractérisé en ce que
    le moyen d'isolation est formé d'un revêtement électriquement isolant (25), qui est appliqué au moins en partie sur le goujon d'étanchéité (11).
  7. Joint haute pression selon la revendication 6,
    caractérisé en ce que
    le revêtement électriquement isolant (25) présente une épaisseur de couche (h) au moins dans une région d'étanchéité (31) qui n'est pas supérieure à une épaisseur limite d'extrusion.
  8. Joint haute pression selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    l'épaulement (18) du goujon d'étanchéité (11) présente une arête d'étanchéité (30) au niveau de laquelle le goujon d'étanchéité (11) est pressé au moins de manière indirecte contre le corps (3).
  9. Joint haute pression selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que
    le goujon d'étanchéité (11) présente un élément de contact (35).
  10. Joint haute pression selon la revendication 9,
    caractérisé en ce que
    l'élément de contact (35) est formé par un alésage borgne.
  11. Joint haute pression selon la revendication 9,
    caractérisé en ce que
    l'élément de contact (35) est réalisé sous forme de connecteur de contact en forme de barre.
  12. Joint haute pression selon l'une quelconque des revendications 1 à 11,
    caractérisé en ce que
    l'alésage (4) prévu dans le corps (3) est réalisé sous forme d'alésage étagé, la douille (9) étant insérée dans l'alésage étagé au moins sensiblement jusqu'à un étage (5) de l'alésage étagé.
  13. Soupape d'injection de carburant (2), en particulier injecteur pour des installations d'injection de carburant de moteurs à combustion interne à auto-allumage et compression d'air, comprenant un dispositif d'actionnement (38) disposé dans un boîtier de soupape (37), au moins le dispositif d'actionnement (38) pouvant être connecté à un appareil de commande (44) par le biais d'un joint haute pression (1) selon l'une quelconque des revendications 1 à 12.
  14. Soupape d'injection de carburant selon la revendication 13,
    caractérisée en ce que
    le corps (13), dans lequel est prévu l'alésage (4) étanchéifié par le joint haute pression (1), est inséré dans le boîtier de soupape (37), est connecté par engagement par liaison de matière au boîtier de soupape (37), ou est réalisé d'une seule pièce avec le boîtier de soupape (37).
EP20070122106 2006-12-29 2007-12-03 Joint haute tension Not-in-force EP1939515B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610062006 DE102006062006A1 (de) 2006-12-29 2006-12-29 Hochdruckabdichtung

Publications (2)

Publication Number Publication Date
EP1939515A1 EP1939515A1 (fr) 2008-07-02
EP1939515B1 true EP1939515B1 (fr) 2013-07-03

Family

ID=39271409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070122106 Not-in-force EP1939515B1 (fr) 2006-12-29 2007-12-03 Joint haute tension

Country Status (2)

Country Link
EP (1) EP1939515B1 (fr)
DE (1) DE102006062006A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008004065U1 (de) * 2008-03-25 2008-06-12 Robert Bosch Gmbh Hochdruckabdichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193895A (en) * 1962-02-23 1965-07-13 Oxley Robert Frederick Plug and socket connections
DE10144919A1 (de) 2001-09-12 2003-05-22 Siemens Ag Vorrichtung umfassend einen piezoelektrischen Aktor
DE10220620A1 (de) 2002-05-08 2003-11-27 Siemens Ag Verschlussvorrichtung und Verfahren zum dichten Verschließen von Bohrungen
DE102004032572B4 (de) * 2004-07-05 2010-03-04 Tyco Electronics Amp Gmbh Verbindungsanordnung mit Kontaktstift

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Publication number Publication date
EP1939515A1 (fr) 2008-07-02
DE102006062006A1 (de) 2008-07-03

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