EP2363593B1 - Kupplungsvorrichtung - Google Patents

Kupplungsvorrichtung Download PDF

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Publication number
EP2363593B1
EP2363593B1 EP20100002236 EP10002236A EP2363593B1 EP 2363593 B1 EP2363593 B1 EP 2363593B1 EP 20100002236 EP20100002236 EP 20100002236 EP 10002236 A EP10002236 A EP 10002236A EP 2363593 B1 EP2363593 B1 EP 2363593B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
fuel
fuel injector
coupling device
spring element
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.)
Active
Application number
EP20100002236
Other languages
English (en)
French (fr)
Other versions
EP2363593A1 (de
Inventor
Giandomenico Serra
Gisella Di Domizio
Edoardo Giorgetti
Daniel Marc
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 EP20100002236 priority Critical patent/EP2363593B1/de
Publication of EP2363593A1 publication Critical patent/EP2363593A1/de
Application granted granted Critical
Publication of EP2363593B1 publication Critical patent/EP2363593B1/de
Active 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common 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
    • 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
    • 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 invention relates to a coupling device for hydraulically and mechanically coupling a fuel rail to a cylinder head of a combustion engine.
  • Coupling devices for hydraulically and mechanically coupling a fuel rail to a cylinder head of a combustion engine are in widespread use, in particular for internal combustion engines.
  • Fuel can be supplied to an internal combustion engine by the fuel rail through a fuel injector.
  • the fuel rail can be coupled to the cylinder head in different manners.
  • a fuel accumulator to which the fuel injectors are connected and which has a relatively large volume.
  • a fuel accumulator is often referred to as a common rail.
  • Known fuel rails comprise a hollow body with recesses in form of fuel injector cups, wherein the fuel injectors are arranged.
  • US 2008/075403 A1 describes a work piece isolating assembly wherein an isolating connector between a first work piece and a second work piece each defining a hole therein includes first and second spring members that capture the first work piece between flanges of the spring members and establishes a column between the second work piece and a head of a bolt extending through the first and second spring members and anchored in the second work piece.
  • the object of the invention is to create a coupling device for hydraulically and mechanically coupling a fuel rail to a cylinder head of a combustion engine which is simply to be manufactured and which facilitates a reliable and precise coupling between the fuel rail and the cylinder head and which allows an easy tightening of the fastening element.
  • the invention is distinguished by a coupling device for mechanically coupling a fuel rail to a cylinder head of a combustion engine.
  • the coupling device comprises a fuel injector cup being designed to be hydraulically and mechanically coupled to the fuel rail and comprising a through hole extending between a first surface and a second surface of the fuel injector cup, the second surface opposing the first surface and being arranged and designed to face the cylinder head, and a fastening element being designed to be fixedly coupled to the cylinder head.
  • the fastening element comprises a head portion and a shank portion. The head portion faces the first surface of the fuel injector cup.
  • the shank portion is partially arranged in the through hole and is designed to be in engagement with the cylinder head.
  • the coupling device comprises a first spring element which is arranged axially between the head portion and the first surface of the fuel injector cup, and a second spring element which faces the second surface of the fuel injector cup and is arrangeable axially between the second surface of the fuel injector cup and the cylinder head.
  • At least one of the spring elements consists of a rubber or comprises a rubber.
  • the coupling of the fuel injector cup with the cylinder head allows an assembly of the cylinder head and the fuel rail without a direct contact between the cylinder head and the fuel injector cup.
  • the spring elements consists of a rubber or comprises a rubber, a noise transmission between the cylinder head and the fuel rail can be kept very small. Additionally, the rubber may be selected in view of the desired stiffness of the spring elements in a simple manner so that a favorable dynamic behavior of the fuel rail relative to the cylinder head may be obtained.
  • the invention is further distinguished by a distance element being arranged axially between the first spring element and the second spring element.
  • the distance element is shaped as a sleeve and is at least partially arranged inside the through hole.
  • the shank portion is at least partially arranged inside the distance element.
  • the distance element comprises at least one collar being arranged axially between the head portion and the first spring element and/or is arrangeable axially between the second spring element and the cylinder head. Due to the at least one collar a preset deformation of the spring element may be obtained.
  • the distance element comprises two collars.
  • the first collar is arranged axially between the head portion and the first spring element and the second collar is arrangeable axially between the second spring element and the cylinder head. This can make it very easy to mount the fuel injector cup to the cylinder head on the production line.
  • the invention is further distinguished by at least one retaining element being arranged inside the distance element and being in engagement with the shank portion.
  • the fastening element may be arranged in any desired position relative to the distance element. Consequently, an easy tightening of the fastening element may be obtained.
  • a first subassembly consisting of the fastening element, the first spring element, the distance element and one of the retaining elements can be obtained which be joined with the second spring element and which enables an easy construction of the coupling device. Consequently, this arrangement can make it very easy to mount the fuel injector cup to the cylinder head.
  • the at least one retaining element consists of a plastic or comprises a plastic. This has the advantage that the retaining element can be in secure engagement with the shank portion.
  • the fastening element is a screw.
  • a fuel feed device 10 is assigned to an internal combustion engine 22 ( Figure 1 ) which can be a diesel engine or a gasoline engine. It includes a fuel tank 12 that is hydraulically connected with a fuel pump 14. The output of the fuel pump 14 is connected to a fuel inlet 16 of a fuel rail 18. In the fuel rail 18, the fuel is stored for example under a pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine. Fuel injectors 20 are connected to the fuel rail 18 and the fuel is fed to the fuel injectors 20 via the fuel rail 18. The fuel injectors 20 are arranged in a cylinder head 70 of the internal combustion engine 22. Preferably, the fuel injectors 20 are not in direct contact with the cylinder head 70.
  • FIG 2 shows a part of the fuel injector 20.
  • the fuel injector 20 has a fuel injector body 24.
  • the fuel injector 20 is suitable for injecting fuel into a combustion chamber 25 of the internal combustion engine 22 ( Figure 1 ).
  • the fuel injector 20 comprises a fuel inlet portion 26.
  • a cavity 28 is arranged in the fuel injector body 24. In an injection mode fuel can flow from the fuel inlet portion 26 to the cavity 28 and can be subsequently injected into the combustion chamber 25. In a non-injecting mode an injection of fuel into the combustion chamber 25 is prevented.
  • the fuel feed device 10 comprises a fuel injector cup 30 which is part of a coupling device 40.
  • the fuel injector cup 30 is mechanically and hydraulically coupled to the fuel rail 18.
  • the fuel injector cup 30 is in engagement with the fuel inlet portion 26 of the fuel injector 20.
  • the fuel injector cup 30 has a through hole 42 with a central longitudinal axis L.
  • the through hole 42 extends between a first surface 44 and a second surface 46 of the fuel injector cup 30.
  • the first surface 44 is forming an outer surface of the fuel injector cup 30.
  • the second surface 46 opposes the first surface 44 and faces the cylinder head 70.
  • the coupling device 40 further comprises a fastening element 48.
  • the fastening element 48 has a head portion 50 and a shank portion 52.
  • the head portion 50 has a larger radial extension than the shank portion 52.
  • the head portion 50 faces the first surface 44 of the fuel injector cup 30.
  • the fastening element 48 is a screw with an outer thread 54.
  • the shank portion 52 is extending through the through hole 42.
  • the shank portion 52 can be in engagement with the cylinder head 70. If the fastening element 48 is a screw, the outer thread 54 is in engagement with an inner thread which is arranged in the cylinder head 70. By this the fastening element 48 can be fixedly coupled to the cylinder head 70.
  • the coupling device 40 further comprises a first spring element 56 and a second spring element 58.
  • the spring elements 56, 58 consist of a rubber or comprise a rubber. Depending on the axial extension and the shape of the spring elements 56, 58 and the type of rubber used for the spring elements 56, 58 a desired stiffness of the spring elements 56, 58 can be selected.
  • the first spring element 56 is arranged axially between the head portion 50 and the first surface 44 of the fuel injector cup 30.
  • the second spring element 58 faces the second surface 46 of the fuel injector cup 30.
  • the second spring element 58 is arranged axially between the second surface 46 of the fuel injector cup 30 and the cylinder head 70.
  • the coupling device 40 comprises a distance element 60 which has the shape of a sleeve.
  • the distance element 60 is arranged axially between the first spring element 56 and the second spring element 58.
  • the distance element 60 enables to maintain a desired distance between the first spring element 56 and the second spring element 58.
  • the distance is selected in a way that the deformation of the spring elements 56, 58 is in a desired range.
  • the distance element 60 is arranged inside the through hole 42.
  • the shank portion 52 is arranged inside the distance element 60.
  • the distance element 60 comprises one collar 62a ( Figures 2 and 5 ).
  • the collar 62a is arranged axially between the head portion 50 and the first spring element 56 ( Figure 2 ) or between the second spring element 58 and the cylinder head 70 ( Figure 5 ).
  • the collar 62a enables to obtain a preset deformation of the spring elements 56, 58.
  • the collar 62a which is arranged between the second spring element 58 and the cylinder head 70 can have a larger contact area than the second spring element 58 so that the pressure between the coupling device 40 and the cylinder head 70 can be very low. Therefore, an imprinting into the cylinder head 70 can be avoided.
  • the distance element 60 comprises two collars 62a, 62b ( Figure 4 ).
  • the distance element 60 has two parts, un upper part 60a and a lower part 60b, which are separated from each other.
  • the upper part 60a of the distance element 60 comprises a first of the collars 62a
  • the lower part 60b of the distance element 60 comprises a second of the collars 62b.
  • the first collar 62a is arranged axially between the head portion 50 and the first spring element 56.
  • the second collar 62b is arranged axially between the second spring element 58 and the cylinder head 70. This can make it very easy to mount the fuel injector cup 30 to the cylinder head 70 on the production line.
  • the coupling device 40 further comprises at least one retaining element 64, 66.
  • the coupling device 40 comprises a first retaining element 64 and a second retaining element 66.
  • the retaining elements 64, 66 are arranged inside the distance element 60 and are in engagement with the shank portion 52.
  • the retaining elements 64, 66 consist of a plastic or comprise a plastic.
  • the retaining elements 64, 66 enable to arrange the fastening element 48 in a position relative to the distance element 60 which allows an easy tightening of the fastening element 48.
  • the fastening element 48, the first spring element 56, the distance element 60 and the first retaining element 64 are composed in a manner that they form a first subassembly 80.
  • the second spring element 58 can be mounted with the first subassembly 80 as shown in Figure 2 .
  • a second subassembly 90 consists of the second spring element 58, the lower part 60b of the distance element 60 and the second retaining element 66.
  • the pre-mounted subassemblies 80, 90 allow an easy mounting of the fuel injector cup 30 with the cylinder head 70 on the production line.
  • the presented coupling of the fuel injector cup 30 with the cylinder head 70 enables to mount the fuel injector cup 30 on the cylinder head 70 without a direct contact between the fuel injector cup 30 and the cylinder head 70. Consequently, a noise transmission between the cylinder head 70 and the fuel rail 18 can be kept small or even be avoided.

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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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (6)

  1. Kupplungsvorrichtung (40) zum mechanischen Kuppeln einer Kraftstoffleitung (18) an einen Zylinderkopf (70) einer Verbrennungsmaschine (22), wobei die Kupplungsvorrichtung (40) Folgendes umfasst:
    - einen Kraftstoffeinspritzbehälter (30), der dazu ausgebildet ist, hydraulisch und mechanisch mit der Kraftstoffleitung (18) gekoppelt zu sein und ein sich zwischen einer ersten Oberfläche (44) und einer zweiten Oberfläche (46) des Kraftstoffeinspritzbehälters (30) erstreckendes Durchgangsloch (42) umfasst, wobei die zweite Oberfläche (46) der ersten Oberfläche (44) gegenüberliegt und derart angeordnet und ausgebildet ist, dass sie dem Zylinderkopf (70) zugewandt ist,
    - ein Befestigungselement (48), das dazu ausgebildet ist, fest mit dem Zylinderkopf (70) gekoppelt zu sein, wobei das Befestigungselement (48) ein Kopfteil (50) und ein Schaftteil (52) umfasst, wobei das Kopfteil (50) der ersten Oberfläche (44) des Kraftstoffeinspritzbehälters (30) zugewandt ist und das Schaftteil (52) teilweise in dem Durchgangsloch (42) angeordnet ist und dazu ausgebildet ist, mit dem Zylinderkopf (70) in Eingriff zu sein,
    - ein erstes Federelement (56), das axial zwischen dem Kopfteil (50) und der ersten Oberfläche (44) des Kraftstoffeinspritzbehälters (30) angeordnet ist, und
    - ein zweites Federelement (58), das der zweiten Oberfläche (46) des Kraftstoffeinspritzbehälters (30) zugewandt ist und axial zwischen der zweiten Oberfläche (46) des Kraftstoffeinspritzbehälters (30) und dem Zylinderkopf (70) angeordnet werden kann,
    wobei mindestens eines der Federelemente (56, 58) aus Gummi besteht oder Gummi aufweist,
    ein Abstandselement (60) axial zwischen dem ersten Federelement (56) und dem zweiten Federelement (58) angeordnet ist, dadurch gekennzeichnet, dass mindestens ein Halteelement (64, 66) innerhalb des Abstandselementes (60) angeordnet und in Eingriff mit dem Schaftteil (52) ist.
  2. Kupplungsvorrichtung (40) nach Anspruch 1, wobei das Abstandselement (60) als eine Hülse geformt ist und mindestens teilweise in dem Durchgangsloch (42) angeordnet ist und wobei das Schaftteil (52) mindestens teilweise in dem Abstandselement (60) angeordnet ist.
  3. Kupplungsvorrichtung (40) nach einem der vorangegangenen Ansprüche, wobei das Abstandselement (60) mindestens einen Kragen (62a, 62b) umfasst, der axial zwischen dem Kopfteil (50) und dem ersten Federelement (56) angeordnet ist und/oder axial zwischen dem zweiten Federelement (58) und dem Zylinderkopf (70) angeordnet werden kann.
  4. Kupplungsvorrichtung (40) nach Anspruch 3, wobei das Abstandselement (60) zwei Kragen (62a, 62b) umfasst, wobei der erste Kragen (62a) axial zwischen dem Kopfteil (50) und dem ersten Federelement (56) angeordnet ist und der zweite Kragen (62b) axial zwischen dem zweiten Federelement (58) und dem Zylinderkopf (70) angeordnet werden kann.
  5. Kupplungsvorrichtung (40) nach einem der vorangegangenen Ansprüche, wobei das mindestens eine Haltelement (64, 66) aus Kunststoff besteht oder Kunststoff aufweist.
  6. Kupplungsvorrichtung (40) nach einem der vorangegangenen Ansprüche, wobei das Befestigungselement (48) eine Schraube ist.
EP20100002236 2010-03-04 2010-03-04 Kupplungsvorrichtung Active EP2363593B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20100002236 EP2363593B1 (de) 2010-03-04 2010-03-04 Kupplungsvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20100002236 EP2363593B1 (de) 2010-03-04 2010-03-04 Kupplungsvorrichtung

Publications (2)

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EP2363593A1 EP2363593A1 (de) 2011-09-07
EP2363593B1 true EP2363593B1 (de) 2013-05-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150075496A1 (en) * 2013-09-18 2015-03-19 Continental Automotive Gmbh Fastening Assembly For A Fuel Rail Of A Combustion Engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372140B1 (de) * 2010-03-25 2012-12-12 Continental Automotive GmbH Kupplungsvorrichtung
DE102012206911A1 (de) * 2012-04-26 2013-10-31 Robert Bosch Gmbh Halter zur Befestigung einer Komponente an einer Brennkraftmaschine
DE102012210369A1 (de) * 2012-06-20 2013-12-24 Robert Bosch Gmbh Halter zur Befestigung eines Brennstoffverteilers an einer Brennkraftmaschine und Brennstoffeinspritzanlage mit solch einem Halter.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3991452B2 (ja) * 1998-06-19 2007-10-17 三菱自動車工業株式会社 インジェクタの取付け構造
DE102005020380A1 (de) * 2005-05-02 2006-11-09 Robert Bosch Gmbh Brennstoffeinspritzvorrichtung
US7682117B2 (en) * 2006-09-27 2010-03-23 Illinois Tool Works Inc. Work piece isolating assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150075496A1 (en) * 2013-09-18 2015-03-19 Continental Automotive Gmbh Fastening Assembly For A Fuel Rail Of A Combustion Engine
CN104454276A (zh) * 2013-09-18 2015-03-25 大陆汽车有限公司 用于燃烧发动机的燃料轨的紧固组件
CN104454276B (zh) * 2013-09-18 2019-06-04 大陆汽车有限公司 用于燃烧发动机的燃料轨的紧固组件

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