DE102011085560A1 - Fuel injector - Google Patents

Fuel injector

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Publication number
DE102011085560A1
DE102011085560A1 DE201110085560 DE102011085560A DE102011085560A1 DE 102011085560 A1 DE102011085560 A1 DE 102011085560A1 DE 201110085560 DE201110085560 DE 201110085560 DE 102011085560 A DE102011085560 A DE 102011085560A DE 102011085560 A1 DE102011085560 A1 DE 102011085560A1
Authority
DE
Germany
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.)
Withdrawn
Application number
DE201110085560
Other languages
German (de)
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE201110085560 priority Critical patent/DE102011085560A1/en
Publication of DE102011085560A1 publication Critical patent/DE102011085560A1/en
Withdrawn legal-status Critical Current

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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 designed as a radially circumferential web with a constant cross-section formed on the rotationally symmetrical component. 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:
  • 1 a longitudinal section through a portion of a fuel injector according to the invention,
  • 2 a detail according to the 1 in an enlarged view and
  • 3 to 8th opposite the 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 1 is an assembly 10 in the form of a fuel injector according to the invention 1 represented as he 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, the functionality of the fuel injector 1 be guaranteed over the entire lifetime.
  • The fuel injector 1 has a metal, in particular consisting of steel, substantially rotationally symmetrical to a longitudinal axis 11 trained component in the form of a holding body 12 on. In an upper area of the fuel injector 1 , which protrudes in particular from the combustion chamber of the internal combustion engine, is the holding body 12 from a plastic, such as PA 66 or a similar existing encapsulation 13 surrounded by a ring. The encapsulation 13 by inserting the holding body 12 is formed in a corresponding injection mold, at the same time forms a plug connection body 14 with connection pins 15 for electrical contacting of the fuel injector 1 out. The connection pins 15 are not shown in detail lines with the interior of the fuel injector 1 or the holding body 12 connected there to control, for example, a piezoelectric actuator, a magnetic actuator or the like, for actuating the fuel injector 1 serves.
  • To prevent during operation of the fuel injector 1 , Especially due to the different sized thermal expansion coefficient of the material of the holding body 12 (Metal) and the encapsulation 13 (Plastic) moisture in the interior of the fuel injector 1 passes, have the holding body 12 and the overmoulding 13 a sealing geometry according to the invention 18 on.
  • The sealing geometry 18 consists of at least two, in an upper edge area 19 and a lower edge area 20 between the encapsulation 13 and the holding body 12 trained sealing areas with radially encircling sealing webs 22 , The sealing geometry 18 is in particular by a machining step on the surface of the holding body 12 However, depending on the application and the materials used, it can also be formed by means of a casting process or the like. The sealing geometry 18 includes, in particular with reference to the 2 is recognizable, one of the component surface 23 of the holding body 12 in the direction of the longitudinal axis 11 of the holding body 12 trained groove 25 , The groove 25 points in the area of the component surface 23 of the holding body 12 one in relation to the longitudinal axis 11 radially encircling opening 26 moving towards the longitudinal axis 11 of the holding body 12 extended in the form of a double undercut or a double backstitch. This also means that the groove 25 in the area of the component surface 25 having the smallest groove width, and that the groove width to the longitudinal axis 11 extended, in the embodiment according to the 1 and 2 steadily up to a groove bottom 38 the groove 25 , In the groove 25 is the material of the encapsulation 13 arranged so that between the holding body 12 and the overmoulding 13 a particularly well-sealed connection is formed.
  • The shape of the groove 25 can be modified or modified in various ways, with reference to the 3 to 8th by way of example. It is with the 3 to 5 such as 8th provided that the groove 25a . 25b . 25c and 25f as one to one perpendicular to the component surface 23 extending level 27 mirror-image trained groove 25a . 25b . 25c and 25f is trained. In the embodiments according to the 3 . 5 and 8th have their grooves 25a . 25c and 25f each a first area 28 with approximately constant cross-section or groove width, at the in the direction of the (not shown) longitudinal axis 11 of the holding body 12 a in cross-section or with respect to the groove width enlarged second area 29a . 29c followed.
  • In the embodiment according to the 3 is the second area 29a formed in cross-section substantially rectangular (with rounded edges), while in the embodiment according to the 5 the second area 29c is formed approximately wedge-shaped. In contrast, the second area 29f in the 8th rectangular shaped, with in the direction of the component surface 23 formed, rectangular extension sections 31 ,
  • According to the 6 and 7 It is also conceivable that the shape of the grooves 25d and 25e unbalanced to the plane 27 is trained. In the embodiment according to the 6 the groove expands 25d from the component surface 23 steadily with a perpendicular to the component surface 23 extending first boundary edge 32 and one opposite the first boundary edge 32 slanted, lower second boundary edge 33 , In the embodiment according to the 7 has the groove 25e opposite an upper, approximately rectangular (possibly with a rounded edge) area 34 and a cross section approximately triangular lower area 35 on, with the two areas 34 and 35 over a cross section intermediate area 36 constant groove width with the component surface 23 are connected.
  • The geometries of the grooves discussed so far 25a to 25f can in the upper edge area 19 and in the lower edge area 20 of the holding body 12 be formed identical, but they can also be designed differently. This allows any geometry of the grooves 25a to 25f optimally adapted to the locally required criteria. In addition, it is also possible in the upper edge area 19 and / or in the lower edge area 20 each more than two grooves 25a to 25f to the holding body 12 train.
  • When molding the plastic material of the encapsulation 13 to the holding body 12 this is done in the liquefied state of the material of the encapsulation 13 ie with a relatively high temperature. This achieves the effect that according to 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 as well as at the bottom of the groove 38 Compressive stresses are generated, which (in relation to the temperatures when generating the encapsulation 13 ) lower ambient temperatures a total of three times radial seal through the sealing geometry 18 cause. In contrast, in the area of the two undercut sections 39 the second areas 29 at a warming and thus against the material of the holding body 12 more extensive material of the encapsulation 13 achieved a double, acting in the radial direction seal. In addition, an axial sealing effect is achieved. This axial sealing effect takes place via the horizontal surface portions of the undercut sections 39 the border areas 19 . 20 , The cooling material causes the encapsulation 13 that the two edge areas 19 . 20 in the axial direction, ie in the direction of the longitudinal axis 11 be braced against each other, so that at the undercut sections 39 In addition, 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, through the groove 25b according to the 4 achieved a greater axial sealing effect than through the grooves 25a according to the 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 12 ,
  • The sealing geometries 18 thus cause in particular a particularly good, because two or three times radial seal in the transition region of the holding body 12 for encapsulation 13 ,
  • The fuel injector described so far 1 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 not only on fuel injectors 1 , but on any assemblies 10 be trained. 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 in the form of a groove 25a to 25f is formed, which differs from the component surface 23 in the direction of the longitudinal axis 11 extends. Of course, it is also conceivable, for example, for manufacturing reasons, the sealing geometry 18 as a kind of "anvil", which differs from the component surface 23 in a direction away from the longitudinal axis 11 extends so that the groove 25a to 25f in the overmoulding 13 is trained.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102005040199 A1 [0002]

Claims (10)

  1. Fuel injector ( 1 ) with a component ( 12 ), which at least partially by an encapsulation ( 13 ) is surrounded, wherein the component ( 12 ) of a first material having a first thermal expansion coefficient and the encapsulation ( 13 ) consists of a second material having a second coefficient of thermal expansion, wherein the two thermal expansion coefficients are of different sizes, wherein between the component ( 12 ) and the encapsulation ( 13 ) at least one sealing area ( 19 . 20 ) provided in the form of one in the component ( 12 ) circumferential sealing ridge ( 22 ) from the material of the encapsulation ( 13 ) with a sealing geometry ( 18 ), and wherein the sealing web ( 22 ) of a circumferential groove ( 25 ; 25a to 25f ) in the component surface ( 23 ) of the component ( 12 ) is limited, characterized in 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 ) towards a groove bottom ( 38 ) at least partially enlarged.
  2. Fuel injector according to claim 1, characterized in that the component ( 12 ) in the area of the sealing geometry ( 18 ) is rotationally symmetrical or has a cross section with rounded corners.
  3. Fuel injector according to claim 1 or 2, characterized in that the groove ( 25 ; 25a to 25c . 25f ) has a cross-section which is mirror-symmetrical to a component surface ( 23 ) vertical 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 in that the groove ( 25 ; 25a ; 25c ; 25e ; 25f ) differs from the component surface ( 23 ) in the direction of a longitudinal axis ( 11 ) subsequent first area ( 28 ; 36 ) with a constant groove width, to which a second area ( 29 ; 29a ; 29c ; 29e ; 29f ), one opposite the first area ( 28 ; 36 ) has larger groove width.
  6. Fuel injector according to one of claims 1 to 5, characterized in that by horizontal surface portions of the groove ( 25 ; 25a ; 25c ; 25e ; 25f ) an axial sealing gasket between the component ( 12 ) and the encapsulation ( 13 ) is formed.
  7. Fuel injector according to one of claims 1 to 6, characterized in that the sealing geometry ( 18 ) by a machining step on the component ( 12 ) is trained.
  8. Fuel injector according to one of claims 1 to 7, characterized in that the component ( 12 ) of metal, in particular of 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 in the longitudinal direction of the component ( 12 ) are arranged spaced from each other.
  10. Fuel injector according to claim 9, characterized in that in at least one of the sealing regions ( 19 . 20 ) two longitudinally spaced sealing geometries ( 18 ) and / or that the sealing geometries ( 18 ) in the sealing areas ( 19 . 20 ) have a different shape.
DE201110085560 2011-11-02 2011-11-02 Fuel injector Withdrawn DE102011085560A1 (en)

Priority Applications (1)

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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110085560 DE102011085560A1 (en) 2011-11-02 2011-11-02 Fuel injector
EP20120186821 EP2589789B1 (en) 2011-11-02 2012-10-01 Fuel injector

Publications (1)

Publication Number Publication Date
DE102011085560A1 true DE102011085560A1 (en) 2013-05-02

Family

ID=47137517

Family Applications (1)

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

Country Status (2)

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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005040199A1 (en) 2005-08-25 2007-03-01 Robert Bosch Gmbh Piezo actuator with plug device and a method for its production

Family Cites Families (3)

* 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
DE102005052255A1 (en) * 2005-11-02 2007-05-03 Robert Bosch Gmbh Fuel injection valve for fuel injection systems of internal combustion engines, has sensitive actuator whereby nozzle body is inserted into downstream extension of connection pipe
DE102007011315A1 (en) * 2006-04-21 2007-10-25 Robert Bosch Gmbh Piezoelectric actuator with a sheath and a method for its production

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005040199A1 (en) 2005-08-25 2007-03-01 Robert Bosch Gmbh Piezo actuator with plug device and a method for its production

Also Published As

Publication number Publication date
EP2589789B1 (en) 2015-01-21
EP2589789A1 (en) 2013-05-08

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