EP2799705A1 - Kraftstoffeinspritzanordnung und Hülseneinsatz - Google Patents

Kraftstoffeinspritzanordnung und Hülseneinsatz Download PDF

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Publication number
EP2799705A1
EP2799705A1 EP13166125.8A EP13166125A EP2799705A1 EP 2799705 A1 EP2799705 A1 EP 2799705A1 EP 13166125 A EP13166125 A EP 13166125A EP 2799705 A1 EP2799705 A1 EP 2799705A1
Authority
EP
European Patent Office
Prior art keywords
components
injector assembly
sleeve insert
fuel injector
component
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Withdrawn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
EP13166125.8A
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English (en)
French (fr)
Inventor
Jean-Christophe Oge
Richard Enters
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.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP13166125.8A priority Critical patent/EP2799705A1/de
Publication of EP2799705A1 publication Critical patent/EP2799705A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly

Definitions

  • This invention is directed to a fuel injector assembly for an internal combustion engine, and a sleeve insert for such an assembly.
  • the invention relates to a fuel injector assembly for use in a compression ignition internal combustion engine.
  • common rail fuel systems have a common rail pump for supplying fuel to a common rail, which in turn supplies fuel to a plurality of injectors of the fuel system.
  • each injector has a dedicated pump.
  • Other types of injection system are known.
  • fuel is supplied at high pressure to one or more injectors, each arranged to inject fuel into an associated engine cylinder.
  • injectors each arranged to inject fuel into an associated engine cylinder.
  • fuel pressure is applied and reduced in order to close and open a valve, by which means fuel is intermittently injected into the cylinder.
  • solenoids or piezoelectric actuators open and close the valve.
  • high and variable pressures are present between various components of the injector.
  • high pressures are commonly present around the tips of such injectors, along the injector nozzle needle and between this and surrounding components such as the nozzle body and barrel.
  • the arrangement and alignment of components making up the injector assembly can be important in maintaining pressure and avoiding malfunctions. Precise machining of these components is commonly required.
  • a very precise concentricity level between inner components is usually required.
  • the axes or bores of the components must match or be aligned as closely as possible. This usually requires grinding machining of contact faces between the components, for example to remove surface inconsistencies which might result in misalignment of components and thus lack of concentricity between the components.
  • Such components are generally located in high pressure areas of the system, and some participate in sealing functions.
  • Fig. 1 shows an example of two such inner components (barrel 106 and nozzle body 108) which have a high pressure sealing function, but this could be applicable to other inner components within the fuel injector.
  • the barrel and nozzle body surround the nozzle needle 104, and are themselves enclosed by the cap nut 102.
  • the nozzle body and nozzle needle protrude from the end of the cap nut.
  • a raised annular lip or ring has been formed on the nozzle body, for insertion into an annular cavity on the barrel. This is intended to aid alignment, but features and shapes such as this annular ring make machining the components much more difficult, and obtaining sufficient grinding finishes on these components, particularly on the contact faces between them, more problematic.
  • the present invention aims to address these problems and provide improvements upon the known devices and methods.
  • one embodiment of a first aspect of the invention can provide a fuel injector assembly for use in an internal combustion engine, the injector assembly comprising: first and second components of the injector assembly, each component associated with an intended common axis for the injector assembly; and a sleeve insert, disposed between the first and second components, the sleeve insert being arranged in contact with at least one of the first and second components to align the at least one component towards the intended common axis.
  • a sleeve insert provides a simpler system for improving concentricity between components, which is also more simple to assemble.
  • the sleeve insert is separate from the first and second components, and can therefore be inserted between components during assembly. These features in turn allow straightforward grinding of contact surfaces between the components.
  • the sleeve insert can act as a centering device between two components, aligning at least one component more closely with a central axis, or an axis of the other.
  • the first and second components are inner components of the injector assembly, arranged in series in the direction of the intended common axis. More preferably, the assembly further comprises an outer housing for inner components of the injector assembly.
  • the second component is an inner component of the injector assembly
  • the first component is an outer housing for inner components of the injector assembly.
  • the intended common axis is an axis of the first component
  • the sleeve insert is arranged to align the second component towards the axis of the first component.
  • the intended common axis is an axis of an injector nozzle to be contained by the first and second components.
  • the sleeve insert may be arranged to align at least the second component towards the axis of the injector nozzle.
  • the sleeve insert is disposed around an outer side of the at least one component.
  • the sleeve insert is disposed around an inner side of the at least one component.
  • the sleeve insert is disposed around an outer side of a further inner component, such as an injector nozzle.
  • the sleeve insert is arranged in contact with both of the first and second components, to align the second component towards the axis of the first component.
  • the sleeve insert is elongated in the direction of the intended common axis.
  • the sleeve insert may be configured to span a junction of the first and second components, and may overlap a portion of each of the first and second components. More preferably, the sleeve insert is configured to contact the overlapped portions of the first and second components to maintain an alignment of the first and second components in the direction of the axis of the first component.
  • the sleeve insert is accommodated by a notch in the at least one component.
  • the accommodation of the sleeve insert by the notch provides a flush surface between an outer or inner perimeter of the at least one component and an outer or inner perimeter of the sleeve insert.
  • the sleeve insert is accommodated by a pair of notches, one in each of the first and second components.
  • the sleeve insert is arranged to provide a seal against a high pressure environment at a core of the fuel injector assembly.
  • the sleeve insert may be configured to span the junction of the first and second components, and may overlap a portion of each of the first and second components.
  • the sleeve insert may be configured to contact the overlapped portions of the first and second components to maintain an alignment of the first and second components in the direction of the axis of the first component.
  • Such features allow the high pressure environment around such components to be maintained.
  • leakage between the components at the junction can be limited.
  • a seal around enclosed components such as a nozzle needle, can be improved.
  • the first and second components arranged in series each may, but need not, surround the core of the fuel injector assembly, the core extending in the direction of the intended common axis.
  • the fuel injector assembly further comprises a third component of the injector assembly, the sleeve insert disposed between the first and third components, and in contact with each of the first, second and third components.
  • the first and second components may have similar diameters.
  • the first and second components may be cylindrical, or each comprise at least one portion having a circumference.
  • the first and second components may be a barrel or upper housing, and a nozzle body, respectively, of a fuel injector assembly, and the outer housing may comprise a cap nut.
  • One embodiment of a second aspect of the invention can provide a sleeve insert for a fuel injector assembly according to any of the above embodiments.
  • the following embodiments generally provide a fuel injector assembly in which a sleeve insert is used to centre or align components of the injector assembly. These are generally more simple than previously considered methods for addressing alignment, concentricity and machining issues.
  • the embodiment provides a centering or alignment sleeve between the two (or more) inner components.
  • This sleeve may be located at two different positions:
  • Figure 2 illustrates the first type of centering or alignment sleeve insert, in a fuel injector assembly.
  • This diagram shows the tip of a fuel injector assembly; embodiments of the invention are similarly applicable to other parts of such an assembly, where two or more components can usefully be better aligned than they otherwise might be, or be more simply aligned compared to previous attempts.
  • the assembly comprises a cap nut 202, nozzle needle 204, barrel 206 and nozzle body 208.
  • the cap nut encloses the inner components of the assembly, although the nozzle needle and nozzle body protrude slightly from the end of the nut.
  • the cap nut is generally cylindrical, with an inner annular shoulder abutting internal components, preventing their egress from the assembly.
  • the barrel 206 and nozzle body 208 are arranged in series along the axis of the assembly, and are enclosed within the cap nut, both abutting an inner side of the cap nut.
  • the barrel and nozzle body are also generally cylindrical. A junction between the contact faces of the barrel and the nozzle body extends around a plane perpendicular to the injector axis.
  • This bore and the nozzle needle are a particular focus of the high pressures acting on the injector. Therefore it is important that this inner, high pressure fuel side of the components is adequately sealed.
  • the sleeve insert (210) is positioned at the junction between the barrel and nozzle body, spanning the junction between the components.
  • the sleeve is on an inner side of these components, in the bore defined through them.
  • the sleeve is recessed into both the barrel and the nozzle body, thereby presenting a continuous flush surface along the inner side of the barrel, then along the inner side of the sleeve, then along the inner side of the nozzle body. This surface houses the nozzle needle in the bore along the assembly.
  • the recession is achieved by means of an annular notch or cavity in each of the barrel and nozzle body, the cavities or notches opposing each other across the junction.
  • the sleeve insert is generally ring-shaped, with a rectangular cross section extending in the direction of the injector axis. Each cavity is generally as deep as half the length of this rectangular cross section, so that around half of the sleeve is accommodated on either side.
  • the sleeve insert therefore provides a centering or concentricity improving role; the two components, here the barrel and nozzle body, are essentially prevented from moving with respect to each other in the plane perpendicular to the injector axis, as the sleeve contacts an inner face of both of the components. Any difference or misalignment of the axes or bores of the two components in the injector assembly is largely corrected, as the opposing cavities are brought into alignment by the sleeve spanning the junction. Therefore any lack of concentricity between the two components is minimised.
  • the inner sleeve (as opposed to the outer sleeve later described) can help to correct a slightly eccentric bore in one or both of the components; the bores of the components will be aligned by the sleeve, preserving as far as possible the trueness of the inner bore housing the needle, to maintain the high pressures involved.
  • the sleeve spans the junction between the barrel and nozzle body, helping to seal the high pressure environment on the inner side in the bore of the injector. Leakages along the junction, between the contact faces of the components, are minimised. The effect is compounded by the higher pressure on the inner side of the injector, in the bore housing the needle; this additional pressure is applied radially against the inner side of the sleeve, helping the sleeve to plug against the cavities and the junction.
  • the sealing effect may also be improved by the sleeve, due to the likely greater tolerances available for machining such a simple ring component, as compared to the more complex barrel and nozzle body.
  • the inner surface of the sleeve may therefore provide an improved surface as compared to the inner surface of the barrel and nozzle body.
  • the inner surface of the sleeve may be smoother, and/or have better circularity than the barrel/nozzle body, thereby providing a better seal against the nozzle needle.
  • Figure 3 illustrates the second type of centering or alignment sleeve insert, in the fuel injector assembly.
  • the assembly comprises a cap nut 302, nozzle needle 304, barrel 306 and nozzle body 308.
  • the sleeve insert (310) is on an outer side of the components, between the components and the cap nut. Again the sleeve is recessed into both the barrel and the nozzle body, thereby presenting a continuous flush surface, this time along the outer side of the components and sleeve. This surface abuts the inner side of the cap nut.
  • the recession is again achieved by means of an annular cavity in each of the barrel and nozzle body, the cavities opposing each other across the junction. This time the cavities are cut into the outer side of the components, rather than the inner side as in Figure 2 .
  • the sleeve insert therefore again provides a centering or concentricity improving role; the two components, are again prevented from moving with respect to each other in the plane perpendicular to the injector axis, as the sleeve contacts an outer face of both of the components. Any difference or misalignment of the axes of the two components in the injector assembly is largely corrected, as the opposing cavities are brought into alignment by the sleeve spanning the junction.
  • An outer sleeve insert of this type could be used for its centering function alone.
  • the sleeve could be introduced around an inner component, such as either the barrel or nozzle body, simply to centre that component in the bore of the cap nut, to align the axis of the component with that of the cap nut.
  • the sleeve would likely not be recessed into the component, in order to provide the centering function.
  • Such a centering function could be used instead of or in addition to embodiments in which the sleeve spans two or more components.
  • the use of the sleeve insert in either the inner or outer sleeve configuration may reduce or remove completely the need for the grinding operation on contact faces of the two (or more) inner components, with grinding finishing only on the centering sleeve.
  • the sleeve can be made long enough in the axial direction so that such irregularities project no further from either contact face than the span of the sleeve across the junction. In such a case, the grinding on these contact faces may no longer be used. Grinding of certain surfaces may nevertheless be needed, particularly on the inner side or surface of the sleeve which aims to help provide a sealing function.
  • the manufacture or assembly of the injector will also be simplified by use of either type of sleeve insert.
  • the inner components such as the barrel and nozzle body, can be assembled consecutively into the injector as before, but now with the sleeve inserted as an intervening step.
  • the sleeve will likely be far easier to slot into the cavity or cavities than a lip raised on one component, as in Figure 1 .
  • first and second components may have differing diameters.
  • the recession on the second may be smaller, or the housing may also change diameter to accommodate the change in size.
  • the sleeve insert may be shaped to compensate, for example the sleeve may be angled or stepped towards the narrower component.
  • the components and sleeve may have shapes other than cylindrical.
  • either or both components may be frusto-conical, which may require a different sleeve shape, employing the same principal.
  • the sleeve may be recessed into a similar cavity on both components, or alternatively a slightly different shaped cavity on one side.
  • the sleeve may take a different form at one end to facilitate this.
  • the components and sleeve may have cross sections overall or in certain portions which are not circular - for example, elliptical or hexagonal.
  • the sleeve insert may be used to span more than two components.
  • an inner or outer sleeve may be positioned between first and third components, and traverse a second component between the first and third.
  • a notch may be present on each of the first and third components, but the intermediate component may simply be reduced in diameter by the width of the sleeve to accommodate it.
  • junction and contact faces between components may not necessarily lie in a plane.
  • the faces may take complementary frusto-conical forms, which would still be easier to grind flat than a surface comprising a lip.
  • the sleeve insert can be either be recessed in the same way as above, or be formed to match, taking a similar shape to those described above, but with end portions of ring sloped to match the profile of the contact faces.
  • the sleeve insert may have a number of optional different design features.
  • the cross section may be square, rectangular or another appropriate geometry, depending on the requirements of the particular assembly. For example, if minimal grinding of the contact faces between the barrel and nozzle body is preferred, a rectangular cross section (or otherwise elongate in the axial direction) may be preferred, in order to span what may be a wider junction due to imperfections in the contact surfaces.
  • the notch or cavity to accommodate the insert will take similar complementary forms.
  • the sleeve may be hollow, or have one or more inner cavities - these may provide ease of manufacture, or preferred mechanical properties such as flexibility or rigidity.
  • the sleeve may be a discontinuous ring or cylinder, for example in cases where alignment is more important than sealing performance, and where manufacture of such a ring or cylinder is more convenient.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP13166125.8A 2013-05-01 2013-05-01 Kraftstoffeinspritzanordnung und Hülseneinsatz Withdrawn EP2799705A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13166125.8A EP2799705A1 (de) 2013-05-01 2013-05-01 Kraftstoffeinspritzanordnung und Hülseneinsatz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13166125.8A EP2799705A1 (de) 2013-05-01 2013-05-01 Kraftstoffeinspritzanordnung und Hülseneinsatz

Publications (1)

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EP2799705A1 true EP2799705A1 (de) 2014-11-05

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EP13166125.8A Withdrawn EP2799705A1 (de) 2013-05-01 2013-05-01 Kraftstoffeinspritzanordnung und Hülseneinsatz

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016206835A1 (de) * 2015-06-25 2016-12-29 Robert Bosch Gmbh Kraftstoffinjektor und verfahren zur montage eines kraftstoffinjektors
WO2018159325A1 (ja) * 2017-03-03 2018-09-07 株式会社デンソー 燃料噴射弁
FR3065037A1 (fr) * 2017-04-10 2018-10-12 Delphi International Operations Luxembourg S.A R.L. Bague de centrage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1043496A2 (de) * 1999-04-07 2000-10-11 Delphi Technologies, Inc. Einspritzventil zur Kraftstoffeinspritzung in einer Verbrennungskraftmaschine
US20030010837A1 (en) * 2001-07-13 2003-01-16 Ulrich Augustin Device and method for positioning parts in a fuel injector
WO2005108773A1 (de) * 2004-05-06 2005-11-17 Siemens Aktiengesellschaft Einspritzventil für brennkraftmaschinen
WO2009071943A1 (en) * 2007-12-05 2009-06-11 Delphi Technologies, Inc. Means for aligning and pre-stressing components of a fuel injector assembly
DE102010063306A1 (de) * 2010-12-16 2012-06-21 Robert Bosch Gmbh Einspritzgruppe sowie Verfahren zu deren Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1043496A2 (de) * 1999-04-07 2000-10-11 Delphi Technologies, Inc. Einspritzventil zur Kraftstoffeinspritzung in einer Verbrennungskraftmaschine
US20030010837A1 (en) * 2001-07-13 2003-01-16 Ulrich Augustin Device and method for positioning parts in a fuel injector
WO2005108773A1 (de) * 2004-05-06 2005-11-17 Siemens Aktiengesellschaft Einspritzventil für brennkraftmaschinen
WO2009071943A1 (en) * 2007-12-05 2009-06-11 Delphi Technologies, Inc. Means for aligning and pre-stressing components of a fuel injector assembly
DE102010063306A1 (de) * 2010-12-16 2012-06-21 Robert Bosch Gmbh Einspritzgruppe sowie Verfahren zu deren Herstellung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016206835A1 (de) * 2015-06-25 2016-12-29 Robert Bosch Gmbh Kraftstoffinjektor und verfahren zur montage eines kraftstoffinjektors
WO2018159325A1 (ja) * 2017-03-03 2018-09-07 株式会社デンソー 燃料噴射弁
JP2018145849A (ja) * 2017-03-03 2018-09-20 株式会社デンソー 燃料噴射弁
CN110337538A (zh) * 2017-03-03 2019-10-15 株式会社电装 燃料喷射阀
CN110337538B (zh) * 2017-03-03 2021-11-19 株式会社电装 燃料喷射阀
FR3065037A1 (fr) * 2017-04-10 2018-10-12 Delphi International Operations Luxembourg S.A R.L. Bague de centrage

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