EP1793122B1 - Kraftstoffeinspritzvorrichtung - Google Patents

Kraftstoffeinspritzvorrichtung Download PDF

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Publication number
EP1793122B1
EP1793122B1 EP05026379A EP05026379A EP1793122B1 EP 1793122 B1 EP1793122 B1 EP 1793122B1 EP 05026379 A EP05026379 A EP 05026379A EP 05026379 A EP05026379 A EP 05026379A EP 1793122 B1 EP1793122 B1 EP 1793122B1
Authority
EP
European Patent Office
Prior art keywords
fuel injector
fuel
cup
projection
assembly
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.)
Expired - Fee Related
Application number
EP05026379A
Other languages
English (en)
French (fr)
Other versions
EP1793122A1 (de
Inventor
Paolo Campanella
Antonio Liuzzo
Davide Matteini
Salvatore Varchetta
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 DE602005024420T priority Critical patent/DE602005024420D1/de
Priority to EP05026379A priority patent/EP1793122B1/de
Publication of EP1793122A1 publication Critical patent/EP1793122A1/de
Application granted granted Critical
Publication of EP1793122B1 publication Critical patent/EP1793122B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/851—Mounting of fuel injection apparatus provisions for adjusting the angular, rotational or axial position 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa

Definitions

  • the invention relates to a fuel injector assembly comprising a fuel injector and a fuel injector cup.
  • Fuel injector assemblies are in widespread use, in particular for internal combustion engines. Fuel can be supplied to an internal combustion engine by the fuel injector assembly that includes the fuel injector cup and the fuel injector. The fuel injectors can be coupled to the fuel injector cups in different manners.
  • Known fuel rails comprise a hollow body with recesses in form of fuel injector cups, where the fuel injectors are arranged.
  • the connection of the fuel injectors to the fuel injector cups that supply the fuel from a fuel tank via a low or highpressure fuel pump needs to be very precise to get a correct injection angle.
  • US 5,724,946 discloses a fuel rail and injector assembly which include a fuel delivery rail having an injector cup and a fuel injector having a mounting end mountable in the injector cup.
  • the injector cup includes a receiving section having a necked down portion and a retaining portion, integral with the injector cup.
  • the fuel injector mounting end includes an integral engaging section urgeable through the necked portion down portion and receivable in the retaining portion for snap fastening together the fuel injector and the fuel rail injector cup.
  • the object of the invention is to create a fuel injector assembly which is simply to be manufactured and which facilitates a reliable and precise connection between the fuel injector and the fuel injector cup.
  • the invention is distinguished by a fuel injector assembly including a central longitudinal axis comprising a fuel injector with a fuel inlet portion and an outer surface, and a fuel injector cup with an inner surface, an outer surface and an end section.
  • the fuel inlet portion of the fuel injector is designed to interact with the end section of the fuel injector cup.
  • the inner surface of the fuel injector cup is designed to sealingly engage the outer surface of the fuel injector.
  • the outer surface of the fuel injector comprises a projection, the end section of the fuel injector comprises a protrusion, and the protrusion engages the projection of the fuel injector for retaining the fuel injector and the fuel injector cup in direction of the central longitudinal axis.
  • the fuel injector assembly may have a very high stability in view of avoiding translative movement of the fuel injector relative to the fuel injector cup. Furthermore, no extra parts for the connection of the fuel injector and the fuel injector cup has to be manufactured and the construction of the fuel injector assembly can be simplified. In addition, the assembly process may be accelerated as only two parts have to be coupled with each other.
  • the outer surface of the fuel injector comprises a stop element, and the protrusion engages the stop element of the fuel injector for retaining the fuel injector against rotation relative to the fuel injector cup.
  • the projection comprises a groove and the groove receives the protrusion.
  • the projection comprises an inclined plane section forming an inclined plane on the outer surface of the fuel injector and the inclined plane extends in direction of the central longitudinal axis.
  • the stop element extends in radial direction from the outer surface of the fuel injector and is arranged relative to the protrusion for retaining the protrusion in the groove against rotation of the fuel injector relative to the fuel injector cup.
  • the protrusion comprises a final section with an edge and the longitudinal section of the final section is of the shape of a semi-circular arc with the edge orientated in direction to the central longitudinal axis.
  • the fuel injector comprises a plurality of projections circumferentially distributed over the outer surface of the fuel injector and the fuel injector cup comprises a plurality of protrusions circumferentially distributed over the end section of the fuel injector cup.
  • the outer surface of the fuel injector comprises two opposing projections and the fuel injector cup comprises two opposing protrusions in radial direction with respect to the central longitudinal axis.
  • the projections and the protrusions extend angularly less than 90°.
  • the protrusion is designed as a fork with two prongs and a gap between the two prongs and the fork receives the projection in the gap.
  • the projection is of a trapezoidal cross section and the gap having an inner gap section is of a trapezoidal cross section to receive the projection.
  • the gap is designed such that it is possible to push the projection into the gap by elastic deformation of the prongs.
  • the projection and the stop element are a one-piece-element.
  • the number of elements of the fuel injector assembly may be reduced and consequently a reduction of costs may be obtained.
  • the fuel injector cup is made out of stainless steel.
  • a fuel feed device 10 is assigned to an internal combustion engine 22 ( figure 1 ). It includes a fuel tank 12 that is connected via a first fuel line to a low-pressure pump 14. The output of the low-pressure pump 14 is connected to a fuel inlet 16 of a fuel rail 18. Fuel injectors 20 are connected to the fuel rail 18. The fuel is fed to the fuel injectors 20 via the fuel rail 18. The fuel injectors 20 have a sealed connection to the fuel rail 18.
  • Figure 2 to 8 show a first embodiment of the fuel injector assembly.
  • the fuel injector 20 has a fuel injector body 24 and is suitable for injecting fuel into a gasoline engine.
  • the fuel injector body 24 has a fuel inlet portion 26, a not shown fuel outlet portion and an outer surface 28.
  • the outer surface 28 of the fuel injector body 24 comprises two opposing projections 30 in radial direction with respect to the central longitudinal axis L.
  • Each of the projections 30 has a groove 34.
  • four stop elements 32 are arranged on the outer surface 28 of the fuel injector body 24, two of the stop elements 32 are related to one of the grooves 34, one of each stop element 32 positioned at each side of each groove 34.
  • Figure 3 shows a fuel injector cup 38 with an inner surface 40 and an outer surface 42.
  • An end section 44 of the fuel injector cup 38 comprises two opposing protrusions 46 in radial direction with respect to the central longitudinal axis L.
  • Each of the protrusions 46 has a final section 48 with an edge 50.
  • the final section 48 of the protrusion 46 is formed in the shape of a semi-circular arc and the edge 50 is orientated in direction to the central longitudinal axis L.
  • the groove 34 of the projection 30 of the fuel injector body 24 receives the final section 48 of the protrusion 46 of the fuel injector cup 38. Due to the semi-circular arc shape of the final section 48 of the protrusion 46 the fuel injector cup 38 has a particular high stability against distortion.
  • the stop elements 32 extend in radial direction from the outer surface 28 of the fuel injector body 24 of the fuel injector 20.
  • the fuel injector 20 comprises a sealing ring 36 which is arranged between the fuel injector body 24 and the fuel injector cup 38 to obtain a good sealing between the fuel injector 20 and the fuel injector cup 38.
  • the surface of the sealing ring 36 is forming a part of the outer surface 28 of the fuel injector 20.
  • the fuel injector cup 38 is preferably made out of stainless steel. This allows an elastic deformation of the protrusions 46 formed in the shape of a semi-circular arc and can reduce the corrosion of the fuel injector assembly.
  • the fuel injector 20 is pushed into the fuel injector cup 38 by shifting the fuel inlet portion 26 of the fuel injector 20 into the end section 44 of the fuel injector cup 38.
  • the protrusions 46 of the fuel injector cup 38 have to be positioned in a way that they can engage the grooves 34 of the fuel injector 20.
  • the protrusions 46 engage with the inclined planes 31 of the fuel injector body 24.
  • the final sections 48 of the protrusions 46 are shifted radially outward until they engage the grooves 34. Consequently, a snap-fit connection is established.
  • the inner surface 40 of the fuel injector cup 38 sealingly engages the outer surface 28 of the fuel injector 20 in the section of the sealing ring 36. After the assembling fuel can flow through the fuel injector cup 38 into the fuel inlet portion 26 of the fuel injector 20 without fuel leakage.
  • a rotational force has to be applied on the fuel injector 20 thereby using a torque which is high enough that the final sections 48 of the protrusions 46 can overcome the stop elements 32 of the fuel injector 20 (arrow A).
  • the protrusions 46 are to be in disengagement with the projections 30 of the fuel injector 20.
  • the fuel injector 20 can be shifted away from the fuel injector cup 38 in axial direction (arrow B) and the fuel injector 24 and the fuel injector cup 38 can be separated from each other.
  • Figures 9 to 12 show a further embodiment of the fuel injector assembly.
  • the end section 44 of the fuel injector cup 38 comprises two protrusions 46.
  • Each of the protrusions 46 is formed as a fork with two prongs 52 and a gap 54 between the two prongs 52.
  • the gap 54 receives the projection 30.
  • the projection 30 is of a rectangular cross section and the gap 54 has an inner gap section 56 which has a trapezoidal cross section to receive the projection 30.
  • the prongs 52 are of a material which allows an elastic deformation of the prongs 52. By this it is possible to push the projection 30 into the gap 54 by elastic deformation of the prongs 52. This construction allows to avoid axial movement of the fuel injector 20 against the fuel injector cup 38 as well as to avoid rotational movement of the fuel injector 20 relative to the injector cup 38 as the projection 30 and the stop element 32 are a one-piece-element.
  • the fuel injector cup 38 is preferably made out of stainless steel. This allows an elastic deformation of the protrusions 46 and can reduce the corrosion of the fuel injector assembly.
  • the fuel injector 20 is pushed into the fuel injector cup 38 by shifting the fuel inlet portion 26 into the end section 44 of the fuel injector cup 38.
  • the projections 30 of the fuel projector 20 and the protrusions 46 of the fuel injector cup 38 have to be positioned in a way that one of each of the gaps 54 between the prongs 52 and one of each of the projections 30 of the fuel projector 20 are on one axis parallel to the central longitudinal axis L.
  • each two of the prongs 52 of the protrusions 46 engage with one of the projections 30 of the fuel projector 20. Consequently, a snap-fit connection is established.
  • the inner surface 40 of the fuel injector cup 38 sealingly engages the outer surface 28 of the fuel injector 20 in the section of the sealing ring 36. After the assembling fuel can flow through the fuel injector cup 38 into the fuel inlet portion 26 of the fuel injector 20 without fuel leakage.
  • a axial force has to be applied on the fuel injector 20 which is high enough that the projections 30 can overcome the prongs 32 of the fuel injector 20 by elastic deformation of the prongs 52 and the projections 30 can leave the inner gap sections 56. Consequently, the projections 30 of the fuel injector 20 are in disengagement with the protrusions 46 of the fuel injector cup 38. Now the fuel injector 20 can be completely shifted away from the fuel injector cup 38 in axial direction and the fuel injector 24 and the fuel injector cup 38 can be separated from each other.

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

Claims (13)

  1. Kraftstoffinjektoranordnung mit einer zentralen Längsachse (L), umfassend
    einen Kraftstoffinjektor (20) mit einem Kraftstoffeinlassbereich (26) und einer äußeren Oberfläche (28) sowie einen Kraftstoffinjektorbecher (38) mit einer inneren Oberfläche (40), einer äußeren Oberfläche (42) sowie einem Endabschnitt (44), während
    der Kraftstoffeinlassbereich (26) des Kraftstoffinjektors (20) gestaltet ist, um mit dem Endabschnitt (44) des Kraftstoffinjektorbechers (38) wechselzuwirken, und
    die innere Oberfläche (40) des Kraftstoffinjektorbechers (38) gestaltet ist, um dichtend mit der äußeren Oberfläche (28) des Kraftstoffinjektors (20) in Eingriff zu stehen, während
    die äußere Oberfläche (28) des Kraftstoffinjektors (20) einen Überstand (30) umfasst, der Endabschnitt (44) des Kraftstoffinjektorbechers (38) einen Vorsprung (46) umfasst und der Vorsprung (46) mit dem Überstand (30) des Kraftstoffinjektors (20) zum Zurückhalten des Kraftstoffinjektors (20) in dem Kraftstoffinjektorbecher (38) in Richtung der zentralen Längsachse (L) in Eingriff steht, dadurch gekennzeichnet, dass der Vorsprung (46) einen Endabschnitt (48) mit einem Rand (50) umfasst und der Längsabschnitt des Endabschnitts (48) die Form eines Halbkreisbogens aufweist, während der Rand (50) in Richtung zu der zentralen Längsachse (L) ausgerichtet ist.
  2. Kraftstoffinjektoranordnung gemäß Anspruch 1, während die äußere Oberfläche (28) des Kraftstoffinjektors (20) ein Anschlagelement (32) aufweist und der Vorsprung (46) mit dem Anschlagelement (32) des Kraftstoffinjektors (20) zum Zurückhalten des Kraftstoffinjektors (20) gegen eine Drehung in Bezug auf den Kraftstoffinjektorbecher (38) in Eingriff steht.
  3. Kraftstoffinjektoranordnung gemäß Anspruch 1 oder Anspruch 2, während der Überstand (30) eine Rille (34) aufweist und die Rille (34) den Vorsprung (46) aufnimmt.
  4. Kraftstoffinjektoranordnung gemäß einem der vorhergehenden Ansprüche, während der Überstand (30) einen abgeschrägten ebenen Abschnitt umfasst, der eine schräge Ebene auf der äußeren Oberfläche (28) des Kraftstoffinjektors (20) bildet, während die schräge Ebene sich in Richtung der zentralen Längsachse (L) erstreckt.
  5. Kraftstoffinjektoranordnung gemäß einem der Ansprüche 3 und 4, während das Anschlagelement (32) sich in radialer Richtung von der äußeren Oberfläche (28) des Kraftstoffinjektors (20) erstreckt und in Bezug auf den Vorsprung (46) zum Zurückhalten des Vorsprungs (46) in der Rille (34) gegen die Drehung des Kraftstoffinjektors (20) in Bezug auf den Kraftstoffinjektorbecher (38) angeordnet ist.
  6. Kraftstoffinjektoranordnung gemäß einem der vorhergehenden Ansprüche, während der Kraftstoffinjektor (20) eine Mehrzahl von Überständen (30) aufweist, die umfänglich über die äußere Oberfläche (28) des Kraftstoffinjektors (20) verteilt ist, und der Kraftstoffinjektorbecher (38) umfasst eine Mehrzahl von Vorsprüngen (46), die umfänglich über den Endabschnitt (44) des Kraftstoffinjektorbechers (38) verteilt ist.
  7. Kraftstoffinjektoranordnung gemäß einem der vorhergehenden Ansprüche, während die äußere Oberfläche (28) des Kraftstoffinjektors (20) zwei entgegengesetzte Überstände (30) umfasst und der Kraftstoffinjektorbecher (38) zwei entgegengesetzte Vorsprünge (46) in radialer Richtung in Bezug auf die zentrale Längsachse (L) aufweist.
  8. Kraftstoffinjektoranordnung gemäß Anspruch 7, während die Überstände (30) und die Vorsprünge (46) sich winklig weniger als 90° erstrecken.
  9. Kraftstoffinjektoranordnung mit einer zentralen Längsachse (L), umfassend
    einen Kraftstoffinjektor (20) mit einem Kraftstoffeinlassbereich (26) und einer äußeren Oberfläche (28) sowie einen Kraftstoffinjektorbecher (38) mit einer inneren Oberfläche (40), einer äußeren Oberfläche (42) und einem Endabschnitt (44), während
    der Kraftstoffeinlassbereich (26) des Kraftstoffinjektors (20) gestaltet ist, um mit dem Endabschnitt 44 des Kraftstoffinjektorbechers (38) wechselzuwirken, und
    die innere Oberfläche (40) des Kraftstoffinjektorbechers (38) gestaltet ist, um dichtend mit der äußeren Oberfläche (28) des Kraftstoffinjektors (20) in Eingriff zu stehen, während
    die äußere Oberfläche (28) des Kraftstoffinjektors (20) einen Überstand (30) umfasst, der Endabschnitt (44) des Kraftstoffinjektorbechers (38) einen Vorsprung (46) umfasst und der Vorsprung (46) mit dem Überstand (30) des Kraftstoffinjektors (20) zum Zurückhalten des Kraftstoffinjektors (20) in dem Kraftstoffinjektorbecher (38) in Richtung der zentralen Längsachse (L) in Eingriff steht, dadurch gekennzeichnet, dass der Vorsprung (46) als eine Gabel mit zwei Zinken (52) sowie einer Lücke (54) zwischen den zwei Zinken (52) gestaltet ist, während die Gabel den Überstand (30) in der Lücke (54) aufnimmt.
  10. Kraftstoffinjektoranordnung gemäß Anspruch 9, während der Überstand (30) einen trapezförmigen Querschnitt aufweist und die Lücke (54) einen inneren Lückenabschnitt (56) umfasst, der einen trapezförmigen Querschnitt aufweist, um den Überstand (30) aufzunehmen.
  11. Kraftstoffinjektoranordnung gemäß einem der Ansprüche 9 und 10, während die Lücke (54) gestaltet ist, so dass es möglich ist, den Überstand (30) in die Lücke (54) mittels elastischer Deformation der Zinken (52) zu drücken.
  12. Kraftstoffinjektoranordnung gemäß einem der Ansprüche 2 bis 8 oder 11, während der Überstand (30) und das Anschlagelement (32) ein einstückiges Element sind.
  13. Kraftstoffinjektoranordnung gemäß einem der vorhergehenden Ansprüche, während der Kraftstoffinjektorbecher (38) aus einem rostfreien Stahl hergestellt ist.
EP05026379A 2005-12-02 2005-12-02 Kraftstoffeinspritzvorrichtung Expired - Fee Related EP1793122B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE602005024420T DE602005024420D1 (de) 2005-12-02 2005-12-02 Kraftstoffeinspritzvorrichtung
EP05026379A EP1793122B1 (de) 2005-12-02 2005-12-02 Kraftstoffeinspritzvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05026379A EP1793122B1 (de) 2005-12-02 2005-12-02 Kraftstoffeinspritzvorrichtung

Publications (2)

Publication Number Publication Date
EP1793122A1 EP1793122A1 (de) 2007-06-06
EP1793122B1 true EP1793122B1 (de) 2010-10-27

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EP05026379A Expired - Fee Related EP1793122B1 (de) 2005-12-02 2005-12-02 Kraftstoffeinspritzvorrichtung

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DE (1) DE602005024420D1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7438055B1 (en) * 2007-07-11 2008-10-21 Delphi Technologies, Inc Fuel injector to fuel rail connection
EP2058509B1 (de) * 2007-11-12 2012-07-18 Continental Automotive GmbH Anschlussvorrichtung
JP5315132B2 (ja) 2009-05-29 2013-10-16 株式会社ケーヒン 燃料噴射弁の取り付け構造
CN104271937B (zh) * 2012-05-08 2016-11-23 大陆汽车有限公司 联接装置和燃料喷射器组件
JP6853129B2 (ja) * 2017-07-06 2021-03-31 臼井国際産業株式会社 インジェクターホルダ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19546441A1 (de) * 1995-12-13 1997-06-19 Bosch Gmbh Robert Brennstoffverteiler
US5724946A (en) * 1996-11-22 1998-03-10 Siemens Automotive Corporation Fuel rail and injector assembly
DE19902186A1 (de) * 1999-01-21 2000-07-27 Bosch Gmbh Robert Brennstoffeinspritzvorrichtung

Also Published As

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DE602005024420D1 (de) 2010-12-09
EP1793122A1 (de) 2007-06-06

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