EP3301293A1 - Langer injektor für einen verbrennungsmotor - Google Patents

Langer injektor für einen verbrennungsmotor Download PDF

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Publication number
EP3301293A1
EP3301293A1 EP16191686.1A EP16191686A EP3301293A1 EP 3301293 A1 EP3301293 A1 EP 3301293A1 EP 16191686 A EP16191686 A EP 16191686A EP 3301293 A1 EP3301293 A1 EP 3301293A1
Authority
EP
European Patent Office
Prior art keywords
protrusion
injector
plastic housing
longitudinal
cavity
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Withdrawn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
EP16191686.1A
Other languages
English (en)
French (fr)
Inventor
Matteo Soriani
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP16191686.1A priority Critical patent/EP3301293A1/de
Publication of EP3301293A1 publication Critical patent/EP3301293A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9015—Elastomeric or plastic materials

Definitions

  • the present invention relates to a long injector for an internal combustion engine.
  • fuel injector systems are used to inject pressurized fuel directly into combustion chambers of the internal combustion engines.
  • the fuel injector must be inserted deeply into the combustion chamber.
  • the typical length of a standard injector is about 90 mm.
  • longer injectors have been developed to overcome problems due to the restricted space in the cylinder block and densely arranged components around the cylinder head.
  • a long injector is understood to be an injector with a length greater than 90 mm, which has a base injector portion comprising the functional components for the fuel injection and an extension portion, which puts into effect the hydraulical and the electrical extension.
  • EP 2 700 805 A1 discloses a long injector for an internal combustion engine which comprises a base portion and an extension portion, the base portion and the extension portion being contained in a plastic housing formed in an overmolding process.
  • the plastic housing of a long injector comprises more plastic material which is also present over a greater length compared to that of a standard injector. It has been found, that with regard to long injectors, distortion of the plastic housing due to uneven cooling and shrinkage in the overmolding process can impact the injector overall run-out.
  • a long injector for fuel injection into an internal combustion engine comprising a base portion and an extension portion and a longitudinal axis.
  • the base portion and the extension portion are at least partially arranged in a plastic housing.
  • the plastic housing comprises a cavity.
  • An electrical connection between the base portion and the extension portion is arranged inside the cavity. Walls of the cavity form a first longitudinal protrusion of the plastic housing.
  • the plastic housing comprises at least one second longitudinal protrusion, the second longitudinal protrusion being arranged essentially opposite of the first longitudinal protrusion.
  • protrusion is understood to mean a part of the plastic housing which protrudes from the main surface of the housing, in particular in radial direction.
  • the material forming the protrusion is arranged at a greater distance from the longitudinal axis of the injector than the main part of the housing. That the protrusion is a "longitudinal" protrusion means in particular that its main direction of extension is parallel to the longitudinal axis.
  • the second protrusion being arranged essentially opposite of the first longitudinal protrusion, it is understood that the second protrusion is arranged in a position where its counterbalancing effect, which is described below, is in accordance with that of a protrusion being arranged essentially opposite of the first protrusion.
  • the distance vectors from the longitudinal axis to the first protrusion and to the second protrusion are preferably anti-parallel.
  • the first longitudinal protrusion and the second longitudinal protrusion are positioned in different half spaces with respect to a plane comprising the longitudinal axis and in particular intersecting neither of the first and second longitudinal protrusions. It is possible to form more than one second protrusion, dividing the counterbalancing effect between them. In this case, the position of each second protrusion depends on its mass. In each case, the at least one second protrusion is arranged to counterbalance distortion caused by the first protrusion.
  • the long injector has the advantage, that the second longitudinal protrusion balances the volume of molded plastic material. This more even spatial distribution of the plastic material leads to a more even cooling and shrinkage after the molding process. Thus, distortion of the long injector is minimized.
  • the electrical connection between the base portion and the extension portion comprises at least one wire.
  • the at least one wire may be overmolded with the first longitudinal protrusion and thereby form the cavity in the latter.
  • the walls of the cavity are in this case represented by the molded material surrounding the at least one wire.
  • the second longitudinal protrusion is made of solid plastic and does not comprise a cavity. While the first protrusion functions to house the electrical connections between the base portion and a terminal, the second protrusion according to this embodiment only functions to counterbalance the effect of the first protrusion during the overmolding process. In particular, the second longitudinal protrusion has no electrical function.
  • the length of the first and second longitudinal protrusions are essentially equal.
  • the length of the protrusions is hereby defined as their extent in longitudinal direction and in particular defines the main direction of extension.
  • This embodiment has the advantage, that the effect of the first protrusion is counterbalanced along its entire length.
  • a center of mass of the plastic housing has a distance d from the longitudinal axis of the long injector with d ⁇ 0.2 D or even d ⁇ 0.1 D, where D is the diameter of the injector.
  • the diameter D and the distance d are defined locally at every point of the longitudinal extend of the protrusions.
  • the given condition d ⁇ 0.2 D or even d ⁇ 0.1 D must be fulfilled according to this embodiment essentially over the whole length of the plastic housing.
  • the center of mass of the plastic housing is very close to the longitudinal axis of the long injector. This has the advantage that the material of the plastic housing is very well balanced and distortion effects are minimized.
  • Figure 1 shows a long injector 1 for fuel injection into an internal combustion engine.
  • the long injector has a base portion 3, which is electrically and hydraulically coupled to an extension portion 5 in a coupling area 11.
  • the base portion 3 comprises the valve elements (not shown) of the injector 1 and the fluid outlet portion 7.
  • the extension portion 5 comprises a fluid inlet portion 9.
  • the extension portion 5 further comprises an extension tube 13 for the hydraulical extension of the injector 1 and an electrical extension linking terminals of the base portion 3 to a terminal 17 of the long injector 1.
  • the electrical connection is made by conductors arranged inside a plastic housing 19.
  • the plastic housing 19 houses at least parts of the base portion 3 and the extension portion 5 and is formed in an overmolding process.
  • the plastic housing 19 has a cavity inside a first longitudinal protrusion 15.
  • the longitudinal protrusion 15 has the form of a rib and extends along the extension portion in longitudinal direction at least to the coupling area 11.
  • the coupling area 11 is defined as the region where the base portion 3 and the extension portion 5 are linked.
  • the extension tube 13 is linked to a tube of the base portion 3, and the terminals of the base portion are contacted by the electrical extension.
  • Figure 2 shows a long injector 1 according to an embodiment of the invention.
  • the injector 1 differs from the injector 1 shown in figure 1 in that its plastic housing 19 comprises a second longitudinal protrusion 21.
  • the second longitudinal protrusion 21 is arranged essentially opposite of the first longitudinal protrusion 15 and extends downwards to the coupling area 11.
  • the second longitudinal protrusion 21 counterbalances the amount of plastic material on each side of the injector 1 and reduces distortion of the injector 1 due to shrinkage of the plastic material of the plastic housing 19 in the overmolding process.
  • the amount of material on both sides of the injector has to be essentially the same and has to undergo essentially the same shrinkage, while small deviations can be compensated.
  • a balance can be achieved if the center of mass of plastic material for each point is on the longitudinal axis L or at least close to the longitudinal axis L. Furthermore, distortion is reduced if local deviations of the center of mass from the axis L are not systematically to one side.
  • a mold for producing the plastic housing 19 is designed in a way to produce a second protrusion 21 which counterbalances the effects of the first protrusion.
  • the second protrusion 21 mirrors the first protrusion 15, because inside the first protrusion, the cavity for the electrical connections is arranged.
  • the second protrusion 21 could also contain a cavity, it will typically be easier to manufacture the second protrusion 21 without a cavity and consider the thus deviating spatial distribution of plastic material.
  • the second longitudinal protrusion 21 also has the form of a rib and extends along the extension portion 5 in longitudinal direction to the coupling area 11, like the first protrusion 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP16191686.1A 2016-09-30 2016-09-30 Langer injektor für einen verbrennungsmotor Withdrawn EP3301293A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16191686.1A EP3301293A1 (de) 2016-09-30 2016-09-30 Langer injektor für einen verbrennungsmotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16191686.1A EP3301293A1 (de) 2016-09-30 2016-09-30 Langer injektor für einen verbrennungsmotor

Publications (1)

Publication Number Publication Date
EP3301293A1 true EP3301293A1 (de) 2018-04-04

Family

ID=57042806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16191686.1A Withdrawn EP3301293A1 (de) 2016-09-30 2016-09-30 Langer injektor für einen verbrennungsmotor

Country Status (1)

Country Link
EP (1) EP3301293A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148786A1 (en) * 2021-01-07 2022-07-14 Borgwarner Luxembourg Automotive Systems S.A Fuel injector

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5211149A (en) * 1990-06-29 1993-05-18 Siemens Automotive L.P. Fuel rail for bottom and side fed injectors
EP0649983A1 (de) * 1993-10-26 1995-04-26 MAGNETI MARELLI S.p.A. Elektromagnetisch betätigbares Kraftstoffdosier- und Zerstäubungsventil
DE102011078251A1 (de) * 2011-06-29 2013-01-03 Robert Bosch Gmbh Einspritzventil sowie Verfahren zur Herstellung eines Einspritzventils
DE102011084704A1 (de) * 2011-10-18 2013-04-18 Robert Bosch Gmbh Ausrichtelement für ein Einspritzventil sowie Verfahren zur Herstellung eines Einspritzventils
DE102012204920A1 (de) * 2012-03-27 2013-10-02 Robert Bosch Gmbh Versteiftes Kraftstoffeinspritzventil
EP2700805A1 (de) 2012-08-23 2014-02-26 Continental Automotive GmbH Verlängerungsteil, Einspritzventil und Brennstoffversorgungsanordnung
DE102013211108A1 (de) * 2013-06-14 2014-12-18 Robert Bosch Gmbh Zweiteiliger Kabelhalter für einen Kraftstoffinjektor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5211149A (en) * 1990-06-29 1993-05-18 Siemens Automotive L.P. Fuel rail for bottom and side fed injectors
EP0649983A1 (de) * 1993-10-26 1995-04-26 MAGNETI MARELLI S.p.A. Elektromagnetisch betätigbares Kraftstoffdosier- und Zerstäubungsventil
DE102011078251A1 (de) * 2011-06-29 2013-01-03 Robert Bosch Gmbh Einspritzventil sowie Verfahren zur Herstellung eines Einspritzventils
DE102011084704A1 (de) * 2011-10-18 2013-04-18 Robert Bosch Gmbh Ausrichtelement für ein Einspritzventil sowie Verfahren zur Herstellung eines Einspritzventils
DE102012204920A1 (de) * 2012-03-27 2013-10-02 Robert Bosch Gmbh Versteiftes Kraftstoffeinspritzventil
EP2700805A1 (de) 2012-08-23 2014-02-26 Continental Automotive GmbH Verlängerungsteil, Einspritzventil und Brennstoffversorgungsanordnung
DE102013211108A1 (de) * 2013-06-14 2014-12-18 Robert Bosch Gmbh Zweiteiliger Kabelhalter für einen Kraftstoffinjektor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148786A1 (en) * 2021-01-07 2022-07-14 Borgwarner Luxembourg Automotive Systems S.A Fuel injector

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