EP2589789A1 - Fuel injector - Google Patents

Fuel injector Download PDF

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Publication number
EP2589789A1
EP2589789A1 EP12186821.0A EP12186821A EP2589789A1 EP 2589789 A1 EP2589789 A1 EP 2589789A1 EP 12186821 A EP12186821 A EP 12186821A EP 2589789 A1 EP2589789 A1 EP 2589789A1
Authority
EP
European Patent Office
Prior art keywords
component
fuel injector
sealing
groove
encapsulation
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.)
Granted
Application number
EP12186821.0A
Other languages
German (de)
French (fr)
Other versions
EP2589789B1 (en
Inventor
Udo Schaich
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
Priority to DE201110085560 priority Critical patent/DE102011085560A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2589789A1 publication Critical patent/EP2589789A1/en
Application granted granted Critical
Publication of EP2589789B1 publication Critical patent/EP2589789B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166Selection of particular materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16Sealing of fuel injection apparatus not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90Selection of particular materials
    • F02M2200/9015Elastomeric or plastic materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90Selection of particular materials
    • F02M2200/9053Metals

Abstract

The invention relates to a fuel injector (1), with a component (12) which is at least partially surrounded by an encapsulation (13), wherein the component (12) of a first material having a first coefficient of thermal expansion and the encapsulation (13) of a second material having a second coefficient of thermal expansion, wherein the two coefficients of thermal expansion are of different sizes, wherein between the component (12) and the encapsulation (13) at least one sealing region (19, 20) is provided, which in the form of a in the device (12) The sealing web (22) is formed by a circumferential groove (25; 25a to 25f) in the component surface (23) of the component (12) ) is limited. According to the invention, it is provided that the width of the groove (25; 25a to 25f) on the component surface (23) has a minimum, and that the width of the groove (25; 25a to 25f), starting from the component surface (23) in Direction to a groove bottom (38) towards at least partially enlarged.

Description

    State of the art
  • The invention relates to a fuel injector according to the preamble of claim 1.
  • Such a fuel injector is from the DE 10 2005 040 199 A1 known. In the housing of the fuel injector, a piezoelectric actuator is arranged, which serves for actuating a nozzle needle for injecting fuel into the combustion chamber of an internal combustion engine. When using such a fuel injector in an internal combustion engine, there is the problem that the fuel injector must always operate reliably over a wide temperature range, for example in a temperature range of -40.degree. C. to 160.degree. In addition, the fuel injector and the electrically conductive components must be protected in the fuel injector in particular against the entry of moisture from the outside to ensure proper functioning. For this purpose, in practice, an encapsulation made of plastic on the fuel injector is usually used, which surrounds a metal component of the fuel injector in the region to be protected. The problem with this is that the existing metal component and the existing plastic injection molding of the fuel injector have very different coefficients of thermal expansion, so that may result as a result of the different extent above the above-mentioned temperature range gap between the metallic component and the encapsulation of the fuel injector, the allows moisture to penetrate into the area to be protected in the fuel injector. From the cited document, it is therefore known to provide a labyrinth-like sealing geometry on the component made of metal, which ensures the required sealing between the component and the encapsulation over the entire temperature range. The sealing geometry is a constant circumferential web on the rotationally symmetrical component Cross section formed. Such a bridge can be particularly easy to implement especially in terms of manufacturing technology.
  • Disclosure of the invention
  • Starting from the illustrated prior art, the invention has the object, a fuel injector according to the preamble of claim 1 such that the sealing effect of the encapsulation between the overmolded component of the fuel injector and the encapsulation is improved. This object is achieved in a fuel injector with the features of claim 1, characterized in that the width of the groove on the component surface has a minimum, and that increases the width of the groove, starting from the component surface in the direction of a groove bottom at least partially. Thereby, the particular advantage is achieved that the sealing effect is significantly improved, in particular in the radial direction of the component over the prior art, wherein, depending on the configuration of the shape of the groove in addition, an improvement of the sealing effect in the axial direction of the component can be achieved.
  • Advantageous developments of the fuel injector according to the invention are listed in the subclaims. All combinations of at least two of the features disclosed in the claims, the description and / or the figures fall within the scope of the invention.
  • Particularly simple with good sealing properties, such a sealing geometry can be realized on the component when the component is rotationally symmetrical in the region of the sealing geometry. As a result, the sealing geometry can be produced inexpensively on the component, for example by grinding, turning or the like. Alternatively, however, a cross-section with rounded corners can be provided, which then has at least at least good sealing properties.
  • In manufacturing technology advantageously, the groove has a cross-section which is mirror-symmetrical to a plane perpendicular to the component surface level.
  • In a preferred geometric embodiment of the invention, it is proposed that the groove has a first region with a constant groove width adjoining the component surface in the direction of a longitudinal axis, to which a second region adjoins which has a larger groove width than the first region.
  • In order to reliably prevent the ingress of moisture in the area to be protected, moreover, provision may advantageously be made for at least two sealing regions to be provided which are arranged at a distance from one another in the longitudinal direction of the component. Thus, as it were from both sides of the encapsulation ago an access of moisture is prevented in a space arranged between the sealing geometries.
  • In order to optimize the sealing effect depending on the application or the geometry of the component, it may moreover be provided that in at least one of the sealing regions, two sealing geometries spaced apart in the longitudinal direction are provided and / or that the sealing geometries have a different shape in the sealing regions.
  • Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing.
  • This shows in:
  • Fig. 1
    a longitudinal section through a portion of a fuel injector according to the invention,
    Fig. 2
    a detail according to the Fig. 1 in an enlarged view and
    Fig. 3 to Fig. 8
    opposite the Fig. 2 modified sealing geometries of the fuel injector.
  • The same components or components with the same function are provided in the figures with the same reference numerals.
  • In the Fig. 1 an assembly 10 is shown in the form of a fuel injector 1 according to the invention, as it serves as a fuel injector 1 for injecting fuel into the combustion chamber of an internal combustion engine (not shown), in particular a self-igniting internal combustion engine. The fuel injector 1 is typically exposed during operation to temperatures ranging from about -40 ° C to 160 ° C. Over the entire temperature range addressed while the functionality of the fuel injector 1 should be guaranteed over the entire life.
  • The fuel injector 1 has a metal-made, in particular made of steel, substantially rotationally symmetrical to a longitudinal axis 11 formed component in the form of a holding body 12. In an upper region of the fuel injector 1, which protrudes in particular from the combustion chamber of the internal combustion engine, the holding body 12 is surrounded by a ring of plastic, for example PA 66 or a similar existing encapsulation 13. The encapsulation 13, which is formed by inserting the holding body 12 in a corresponding injection molding tool, simultaneously forms a plug connection body 14 with connection pins 15 for electrical contacting of the fuel injector 1. The connection pins 15 are connected via lines not shown in detail with the interior of the fuel injector 1 and the holding body 12, for example, there to drive a piezoelectric actuator, a magnetic actuator or the like, which serves to actuate the fuel injector 1.
  • In order to prevent moisture from entering the interior of the fuel injector 1 during operation of the fuel injector 1, in particular due to the difference in the thermal expansion coefficients of the material of the holding body 12 (metal) and the encapsulation 13 (plastic), the holding body 12 and the encapsulation 13 a sealing geometry 18 according to the invention.
  • The sealing geometry 18 consists of at least two, in an upper edge region 19 and a lower edge region 20 between the encapsulation 13 and The sealing geometry 18 is produced in particular by a machining step on the surface of the holding body 12, but it can also be formed depending on the application and materials used via a casting process or the like. The sealing geometry 18 includes, in particular with reference to the Fig. 2 can be seen, one of the component surface 23 of the holding body 12 in the direction of the longitudinal axis 11 of the holding body 12 formed groove 25. The groove 25 has in the region of the component surface 23 of the holding body 12 in relation to the longitudinal axis 11 radially encircling opening 26 which extends in Direction extended to the longitudinal axis 11 of the holding body 12 in the form of a double undercut or a double backstitch. This also means that the groove 25 has the smallest groove width in the area of the component surface 25, and that the groove width widens toward the longitudinal axis 11, in the embodiment according to FIG Fig. 1 and 2 in the groove 25, the material of the encapsulation 13 is arranged so that between the holding body 12 and the encapsulation 13, a particularly well-sealed connection is formed.
  • The shape of the groove 25 can be modified or modified in various ways, wherein subsequent to the Fig. 3 to 8 by way of example. It is with the Fig. 3 to 5 and 8, it is provided that the groove 25a, 25b, 25c and 25f is formed as a mirror-like groove 25a, 25b, 25c and 25f to a plane 27 running perpendicular to the component surface 23. In the embodiments according to the Fig. 3, 5 and 8th their grooves 25a, 25c and 25f each have a first region 28 with an approximately constant cross-section or groove width, to which in the direction of (not shown) the longitudinal axis 11 of the holding body 12 in cross-section or with respect to the groove width enlarged second area 29a, 29c connects.
  • In the embodiment according to the Fig. 3 the second region 29a is formed in cross-section substantially rectangular (with rounded edges), while in the embodiment according to the Fig. 5 the second region 29c is approximately wedge-shaped. In contrast, the second area 29f in the Fig. 8 rectangular in shape, with in the direction of the component surface 23 formed, rectangular extension portions 31st
  • According to the 6 and 7 it is also conceivable that the shape of the grooves 25d and 25e is formed asymmetrically to the plane 27. In the embodiment according to the Fig. 6 the groove 25d extends continuously from the component surface 23 with a first boundary edge 32 running perpendicular to the component surface 23 and a lower second boundary edge 33 arranged obliquely with respect to the first boundary edge 32. In the exemplary embodiment according to FIG Fig. 7 the groove 25e to the opposite an upper, approximately rectangular (possibly with rounded edge) region 34 and a cross-section approximately triangular lower portion 35, wherein the two regions 34 and 35 connected via a cross-section intermediate portion 36 of constant groove width with the component surface 23 are.
  • The geometries of the grooves 25a to 25f discussed so far may be identical in the upper edge region 19 and in the lower edge region 20 of the holding body 12, but they may also be designed differently. As a result, each geometry of the grooves 25a to 25f can optimally be optimally adapted to the locally required criteria. Moreover, it is also possible to form more than two grooves 25a to 25f on the holding body 12 in the upper edge region 19 and / or in the lower edge region 20 in each case.
  • When the plastic material of the encapsulation 13 is injection-molded onto the holding body 12, this takes place in the liquefied state of the material of the encapsulation 13, ie with a relatively high temperature. This achieves the effect that according to Fig. 2 Due to compressive stresses due to the cooling material of the encapsulation 13 at the contact surface 37 between the encapsulation 13 and the holding body 12 and at the groove bottom 38 compressive stresses are generated, the (compared to the temperatures when generating the encapsulation 13) lower ambient temperatures a total of three times radial seal effect by the sealing geometry 18. In contrast, in the region of the two undercut portions 39 of the second regions 29, a double, radially acting seal is achieved in the case of a warming material 13 of the encapsulation 13 that is more expansive than the material of the holding body 12. In addition, an axial sealing effect is achieved. This axial sealing effect takes place via the horizontal surface portions of the undercut sections 39 of the edge regions 19, 20. The cooling material of the encapsulation 13 causes the two edge regions 19, 20 in the axial direction, ie in the direction of the longitudinal axis 11 are braced against each other, so that in addition to the undercut portions 39, the axial sealing effect is achieved. This axial sealing effect is greater, the larger the horizontal sealing portions at the edge regions 19, 20 are. For example, by the groove 25b according to Fig. 4 achieved a greater axial sealing effect than by the grooves 25a according to the Fig. 3 , A cooling of the material of the encapsulation 12 thus causes a 3-axis stress state between the encapsulation 12 and the holding body 12th
  • The sealing geometries 18 thus effect in particular a particularly good, because two or three times radial seal in the transition region from the holding body 12 to the encapsulation thirteenth
  • The fuel injector 1 described so far can be modified or modified in many ways, without departing from the spirit of the invention. In particular, it is of course conceivable that such sealing geometries 18 are formed not only on fuel injectors 1 but on any assemblies 10. For reasons of tightness, it is advantageous if their cross-sections have at least rounded corners. Moreover, it is provided in the described embodiment that the sealing geometry 18 is formed in the form of a groove 25 a to 25 f, which extends from the component surface 23 in the direction of the longitudinal axis 11. Of course, it is also conceivable for manufacturing reasons, for example, to form the sealing geometry 18 as an "anvil" extending from the component surface 23 in a direction away from the longitudinal axis 11, so that the groove 25a to 25f is formed in the encapsulation 13.

Claims (10)

  1. Fuel injector (1) with a component (12) which is at least partially surrounded by an encapsulation (13), wherein the component (12) of a first material having a first coefficient of thermal expansion and the encapsulation (13) of a second material with a second Thermal expansion coefficient is, wherein the two coefficients of thermal expansion are of different sizes, wherein between the component (12) and the encapsulation (13) at least one sealing region (19, 20) is provided which in the form of a in the component (12) circumferential sealing ridge (22) is formed from the material of the encapsulation (13) with a sealing geometry (18), and wherein the sealing web (22) is delimited by a circumferential groove (25; 25a to 25f) in the component surface (23) of the component (12),
    characterized,
    in that the width of the groove (25; 25a to 25f) at the component surface (23) has a minimum, and that the width of the groove (25; 25a to 25f), starting from the component surface (23), towards a groove bottom (23) 38) towards at least partially enlarged.
  2. Fuel injector according to claim 1,
    characterized,
    that the component (12) in the region of the sealing geometry (18) is rotationally symmetrical and has a cross section with rounded corners.
  3. Fuel injector according to claim 1 or 2,
    characterized,
    that the groove (25; 25a to 25c, 25f) has a cross-section, is of mirror symmetry to a to the component surface (23) arranged perpendicular plane (27).
  4. Fuel injector according to claim 3,
    characterized,
    in that the groove (25; 25a to 25f) has the shape of a double backstitch.
  5. Fuel injector according to one of claims 1 to 4,
    characterized,
    that the groove (25; 25a; 25c; 25e; 25f) a from the component surface (23) toward a longitudinal axis (11) adjoining the first region (28; 36) with a constant groove width which is adjoined by a second area ( 29; 29a; 29c; 29e; 29f) which has a larger groove width than the first region (28; 36).
  6. Fuel injector according to one of claims 1 to 5,
    characterized,
    in that an axial sealing gasket is formed between the component (12) and the encapsulation (13) by horizontal surface portions of the groove (25; 25a; 25c; 25e; 25f).
  7. Fuel injector according to one of claims 1 to 6,
    characterized,
    that the sealing geometry (18) is formed by a machining step on the component (12).
  8. Fuel injector according to one of claims 1 to 7,
    characterized,
    that the component (12) made of metal, in particular steel, and the encapsulation (13) consists of plastic.
  9. Fuel injector according to one of claims 1 to 8,
    characterized,
    in that at least two sealing regions (19, 20) are provided, which are arranged at a distance from one another in the longitudinal direction of the component (12).
  10. Fuel injector according to claim 9,
    characterized,
    in that at least one of the sealing regions (19, 20) has two sealing geometries (18) spaced apart from one another in the longitudinal direction and / or that the sealing geometries (18) have a different shape in the sealing regions (19, 20).
EP20120186821 2011-11-02 2012-10-01 Fuel injector Active EP2589789B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201110085560 DE102011085560A1 (en) 2011-11-02 2011-11-02 Fuel injector

Publications (2)

Publication Number Publication Date
EP2589789A1 true EP2589789A1 (en) 2013-05-08
EP2589789B1 EP2589789B1 (en) 2015-01-21

Family

ID=47137517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120186821 Active EP2589789B1 (en) 2011-11-02 2012-10-01 Fuel injector

Country Status (2)

Country Link
EP (1) EP2589789B1 (en)
DE (1) DE102011085560A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5820099A (en) * 1997-05-20 1998-10-13 Siemens Automotive Corporation Fluid migration inhibitor for fuel injectors
DE102005040199A1 (en) 2005-08-25 2007-03-01 Robert Bosch Gmbh Piezo actuator with plug device and a method for its production
US20070114299A1 (en) * 2005-11-02 2007-05-24 Martin Scheffel Fuel injector
DE102007011315A1 (en) * 2006-04-21 2007-10-25 Robert Bosch Gmbh Piezoelectric actuator with a sheath and a method for its production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5820099A (en) * 1997-05-20 1998-10-13 Siemens Automotive Corporation Fluid migration inhibitor for fuel injectors
DE102005040199A1 (en) 2005-08-25 2007-03-01 Robert Bosch Gmbh Piezo actuator with plug device and a method for its production
US20070114299A1 (en) * 2005-11-02 2007-05-24 Martin Scheffel Fuel injector
DE102007011315A1 (en) * 2006-04-21 2007-10-25 Robert Bosch Gmbh Piezoelectric actuator with a sheath and a method for its production

Also Published As

Publication number Publication date
DE102011085560A1 (en) 2013-05-02
EP2589789B1 (en) 2015-01-21

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