EP2053235B1 - Moteur à combustion interne doté d'injecteurs de carburant - Google Patents

Moteur à combustion interne doté d'injecteurs de carburant Download PDF

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Publication number
EP2053235B1
EP2053235B1 EP08017534.2A EP08017534A EP2053235B1 EP 2053235 B1 EP2053235 B1 EP 2053235B1 EP 08017534 A EP08017534 A EP 08017534A EP 2053235 B1 EP2053235 B1 EP 2053235B1
Authority
EP
European Patent Office
Prior art keywords
clamping claw
cylinder head
clamping
combustion engine
fuel injection
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
EP08017534.2A
Other languages
German (de)
English (en)
Other versions
EP2053235A3 (fr
EP2053235A2 (fr
Inventor
Martin Biener
Andreas Schüller
Ingo KÜHNE
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP2053235A2 publication Critical patent/EP2053235A2/fr
Publication of EP2053235A3 publication Critical patent/EP2053235A3/fr
Application granted granted Critical
Publication of EP2053235B1 publication Critical patent/EP2053235B1/fr
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
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws

Definitions

  • the invention relates to an internal combustion engine, in particular a diesel engine, in particular a motor vehicle, having at least two working cylinders and a cylinder head closing the working cylinder, in which a fuel injector is arranged for each working cylinder, wherein for each at least two fuel injectors a clamping claw with at least two arms is provided such in that one arm of the clamping claw acts on a fuel injection device and presses the respective fuel injection device against a seat in the cylinder head with a predetermined force, wherein a fastening means is provided, which fixes the clamping claw to the cylinder head, according to the preamble of claim 1.
  • the nozzle clamping device has contact parts which rest on terminal receiving seats of the fuel injection nozzles. Between the contact parts, the nozzle clamping device has a bolt insertion hole into which a clamping bolt is inserted to exert a pressure against the fuel injection nozzles and deliver sealing loads.
  • the nozzle clamp includes a clearance that reduces the pressure force on the fuel injectors such that at a predetermined degree of bolt attraction force, a substantially equal compressive force occurs on the three fuel injectors.
  • the nozzle clamping device is made of a spring material such that the nozzle clamping device is slightly bent.
  • the invention is based on the object, an internal combustion engine og. Improve the way of installation and ease of maintenance.
  • the arms of the clamping claw and / or the fastening means is or are such that above the predetermined force for the pressure of the fuel injectors against subject the respective seat in the cylinder head, the arms of the clamping claw and / or the fastening means of a plastic deformation.
  • the fastening means for at least one clamping claw comprises at least one screw bolt, which is screwed into the cylinder head and engages through the clamping claw, wherein a nut is provided which, screwed onto the screw bolt, forces the clamping claw in the direction of the cylinder head in such a manner, that the clamping claw presses the fuel injection device against the respective seat in the cylinder head.
  • the fastening means for at least one clamping claw comprises at least one through-head screw with a screw head which engages through the clamping claw and is screwed into the cylinder head so that the screw head urges the clamping claw in the direction of the cylinder head such that the clamping claw forces the fuel injection device against the respective one Seat in the cylinder head presses.
  • the clamping claw is formed in three parts and two clamping bracket, each forming one side of the two arms of the clamping claw, as well as a clip piece, which holds the two clamping bracket and through which engages the fastener must after maintenance or repair work on the fuel injectors after the loosening of the fasteners not the complete clamps but only the clamps are replaced.
  • the clamping bracket are formed as sheet metal stampings and / or the staple piece as a sheet metal part, casting or sintered part.
  • the invention comprises a fastening and sealing of, for example, CR (common rail) injectors in a cylinder head of an internal combustion engine.
  • CR common rail
  • a clamping claw is always provided for fastening two injectors each with a fastening screw.
  • the screw connection always takes place in the cylinder head.
  • the preload force on the injectors must be set exactly, otherwise damage to the injector or leaks may occur.
  • the system must therefore always present a minimum preload force, with which the two injectors can be safely sealed.
  • the preload force must be limited to the top so that the injectors are not destroyed.
  • an example M8 threaded bolt 12 is screwed into the cylinder head 10 between each 2 cylinders.
  • the threaded bolt 12 is screwed in to the bottom of the hole.
  • a lead frame 14 is placed with liquid sealant and screwed with, for example M6 combination screws 16.
  • bearing bridges connecting webs between intake and exhaust camshaft bearing
  • the webs are fixed with, for example 2xM6 combination screws (not shown).
  • a replacement of 2xM6 combination screw by 1xM8 combination screw may be provided at these locations.
  • a cylinder head cover 20 is installed.
  • metallic support sleeves 22 are introduced (injected or hammered) in the cylinder head cover. These support sleeves 22 sit loosely on the already mounted M8 nut 18.
  • each a sealing ring 26 is mounted in the region of fuel injectors 24 and in the region of the threaded bolt 12, a seal 28 is integrated to the lead frame.
  • each 2 fuel injectors 24 are fitted together with a clamping claw 30 and inserted together through the two sealing rings 26 in the cylinder head cover 20 in the cylinder head 10.
  • the clamping claw 30 is threaded over a through hole on the threaded bolt 12.
  • the system of fuel injectors 24 and clamping claw 30 is pressed against a sealing seat 32 in an injector bore of the cylinder head 10. Subsequently, the composite is screwed to another example M8 nut 34.
  • the clamping claw 30 is bolted by the applied torque of, for example 20Nm and a further rotation angle of 90 ° to block.
  • the force flow in the region of the threaded bolt 12 thus passes through the outer M8 nut 34 through the clamping claw 30, the sleeve 22, the other M8 nut 18 and the lead frame 14 in the cylinder head 10.
  • the strength of the M8 gland is designed in such a way that it is always possible to screw to block under all tolerance conditions. This is important so that the sealing compound comprising cylinder head cover 20 and lead frame 14 works and so that it can not come to relative movements between the clamping claw 30 and the fuel injectors 24 and between the clamping claw 30 and the sleeve 22.
  • the tolerances are set on the side of the fuel injectors 24 from the height tolerances of the bearing surfaces of the clamping claw 30 to the fuel injectors 24 and amount to up to 1.1 mm. In the area of the support of the clamping claw 30 on the sleeve 22, the tolerances of clamping claw 30, sleeve 22, lead frame 14 and cylinder head 10 together. Here also tolerances in the range of 1.2 mm can result.
  • a distance "x" between clamping claw 30 and sleeve 22 is now designed and set.
  • the case of "least strain path" of the cleat 30 to block fit is relevant. This means that the clamping claw 30 must have sufficient rigidity even with small deformation paths in order to achieve the required preload forces.
  • the clamping claw 30 is designed such that plastic deformation occurs in the clamping claw 30 and thus no further increase in preload force on the fuel injector 24 above the maximum permissible value of 9 kN per fuel injector 24 is possible.
  • the minimum deformation path is thus dependent on the tolerances of the components involved and the selected distance "x" between clamping claw 30 and sleeve 22. The distance "x" results now from the tolerances and a minimum necessary deformation of the plastic deformation of the arms of the clamping claws 30th for achieving the minimum preload force.
  • the clamping claw 30 is designed such that a plastic deformation always takes place in the arms of the clamping claw 30.
  • the middle region of the clamping claw 30 with the through hole and the nut pad up and the sleeve pad down are kept very stiff. This ensures that the support surfaces are not subject to deformation and it does not come to edge supports and biasing force losses.
  • the arms of the clamping claw 30 are designed so that all deformations take place there.
  • the cross-section of the arms is reduced in horizontal section up to the bearing surfaces of the clamping claw 30 depending on the material stiffness and the resulting bending load under load by the screwing.
  • the width of the arms is kept constant.
  • the cross section is chosen such that the minimum preload force is reliably achieved and the maximum allowable bending stress is not exceeded in the transition of the arms in resting feet. From the interplay between geometry and material properties, different variants of clamping claws 30 can now be produced. This has the advantage that one chooses stiffer materials for cramped space conditions, which manage with smaller cross-sections. With sufficient space, however, more cost-effective materials are chosen, resulting in this larger cross-sections in the arms of the clamping claw 30.
  • the distance "x" is a variable that can be used for the optimization.
  • FIGS. 2 and 3 A second, alternative embodiment is in FIGS. 2 and 3 shown. Functionally identical parts are denoted by the same reference numerals as in Fig. 1 so that their explanation to the above description of Fig. 1 is referenced.
  • Fig. 2 realized the screwing of the clamping claw 30 with a through-bolt 36 instead of the above-described bolt solution.
  • the system threaded bolt 12 with two nuts 18, 34 ( Fig. 1 ) replaced by a M8 combi screw 36.
  • a slowly hardening sealant is then preferably used, since the time until the necessary bolt force is applied is longer than in the solution described above Fig. 1 , For the tolerance situation on the screw side results in an improvement, since the M8 nut 18 is omitted for attachment of the lead frame 14.
  • the cylinder head 10 is provided in the preassembled state with attached and bolted cylinder head cover 20.
  • the lead frame 14 is bolted and sealed.
  • each 2 fuel injectors 24 are pre-assembled with a clamping claw 30 and threaded through the two injector sealing rings 26 in the cylinder head 10.
  • the fuel injectors 24 are inserted into the seat 32 in the cylinder head 10 (in FIGS. 2 and 3 not shown) pressed.
  • the fastening screw 36 is inserted through the clamping claw 30 in the cylinder head 10 and bolted with 10Nm and 90 ° further rotation.
  • the fuel injectors 24 are now mounted.
  • a stiff clamping claw 30 is used, which allows only a slight deflection
  • the power flow through the screw 36 thus goes on the one hand directly into the cylinder head 10 and on the other hand directly to the fuel injectors 24.
  • the screw 36 for example, an M6 screw, both can be designed with a washer as well as a one-piece screw.
  • the screw 36 has a sealing shank which seals the screw over the cylinder head cover 20.
  • a sealing rubber 38 is mounted in the cylinder head cover 20. This rubber seal 38 is either molded or mounted.
  • the seat of the screw 36 on the clamping claw 30 is designed such that on the clamping claw 30 has a conical contour and on the screw 36 is formed a spherical contour. Thus, a line load is applied even when tilted the clamping claw 30 or the screw 36. This ensures a uniform load distribution.
  • the clamping claw 30 is not tightened in this case to block. Under the prescribed torque and the further rotation angle, the specified strength of the screw 36 results in a resulting minimum preload force, which depends on the coefficients of friction and the strength tolerances of the screw connection.
  • the screw 36 is limited in this case in its strength and is subject to plastic deformation.
  • An advantage of this system is the reusability of the clamping claw 30. Only the screw 36 must be exchanged after a removal and reinstallation of the fuel injectors 24, for example, if a repair on the injector o.ä. necessary is.
  • Another advantage is that the assembly of the cylinder head 10 prior to assembly of the fuel injectors 24 may be more complete than in the first embodiment according to FIG Fig. 1 , Furthermore, the tolerance situation is improved because of the smaller number of components. Due to the very stiff clamping claw 30, the introduction of lateral forces in the fuel injectors 24 is greatly reduced. In the geometry of the clamping claw 30 is now mainly on maximum rigidity.
  • the clamping claw 30 is formed in three parts and comprises two clamping brackets 42, 44, each forming one side of the two arms of the clamping claw 30, and a central part, clip piece or clamping member 40 in the center of the clamping claw 30 for receiving the screw 36 and the guide the clamping bracket 42.
  • the system is loosely mounted and is held together by the screw forces or it is slightly prefixed by clamping.
  • the advantage of this system is that the clamping claw 30 can be disassembled without pulling both fuel injectors 24. For this purpose, one dismantles the clamping claw 30 apart and then only pulls out the fuel injector 24 to be repaired from the cylinder head 10. Another advantage is the more cost-effective production of the individual parts.

Landscapes

  • 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. Moteur à combustion interne, en particulier moteur diesel, en particulier pour véhicule automobile, présentant au moins deux cylindres de travail et une tête de cylindre (10) qui ferme les cylindres de travail et dans laquelle un ensemble (24) d'injection de carburant est disposé pour chaque cylindre de travail,
    une griffe de serrage (30) présentant au moins deux bras étant prévue pour chacun des deux ou plusieurs ensembles (24) d'injection de carburant un bras de la griffe de serrage (30) agissant sur un ensemble (24) d'injection de carburant et l'ensemble (24) d'injection de carburant concerné repoussant avec une force prédéterminée un siège (32) prévu dans la tête de cylindre (10),
    un moyen de fixation (12; 36) qui fixe la griffe de serrage (30) sur la tête de cylindre (10) étant prévu,
    caractérisé en ce que
    les bras de la griffe de serrage (30) et/ou le moyen de fixation (12; 36) sont configurés de telle sorte que les bras de la griffe de serrage (30) et/ou le moyen de fixation (12; 36) subissent une déformation plastique au-dessus de la force prédéterminée de poussée des ensembles (24) d'injection de carburant contre le siège respectif (32) prévu dans la tête de cylindre (10).
  2. Moteur à combustion interne selon la revendication 1, caractérisé en ce que le moyen de fixation d'au moins une griffe de serrage (30) comporte au moins un goujon fileté (12) qui est vissé dans la tête de cylindre (10) et qui traverse la griffe de serrage (30), et un écrou fileté (34) qui est vissé sur le goujon fileté (21) et qui applique sur la griffe de serrage (30) une force en direction de la tête de cylindre (10) de telle sorte que la griffe de serrage (30) repousse les ensembles (24) d'injection de carburant contre le siège respectif (32) prévu dans la tête de cylindre (10).
  3. Moteur à combustion interne selon au moins l'une des revendications précédentes, caractérisé en ce que le moyen de fixation d'au moins une griffe de serrage (30) comporte au moins une vis (36) traversante dotée d'une tête de vis, qui traverse la griffe de serrage (30) et qui est vissée dans la tête de cylindre (10) de telle sorte que la tête de vis applique sur la griffe de serrage (30) une force en direction de la tête de cylindre (10) de telle sorte que la griffe de serrage (30) repousse les ensembles (24) d'injection de carburant contre le siège respectif (32) prévu dans la tête de cylindre (10).
  4. Moteur à combustion interne selon au moins l'une des revendications précédentes, caractérisé en ce que la griffe de serrage (30) est réalisée en trois pièces et présente deux étriers de serrage (42, 44) qui forment chacun un côté des deux bras de la griffe de serrage (30) ainsi qu'une pièce (40) en pince qui retient les deux étriers de serrage (42, 44) et qui est traversée par le moyen de fixation (12; 36).
  5. Moteur à combustion interne selon la revendication 4, caractérisé en ce que les étriers de serrage (42, 44) sont configurés sous la forme de pièces en tôle estampée.
  6. Moteur à combustion interne selon les revendications 4 ou 5, caractérisé en ce que la pièce en pince (40) est configurée sous la forme d'une pièce en tôle, d'une pièce coulée ou d'une pièce frittée.
EP08017534.2A 2007-10-23 2008-10-07 Moteur à combustion interne doté d'injecteurs de carburant Active EP2053235B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710050512 DE102007050512A1 (de) 2007-10-23 2007-10-23 Brennkraftmaschine mit Kraftstoffinjektoren

Publications (3)

Publication Number Publication Date
EP2053235A2 EP2053235A2 (fr) 2009-04-29
EP2053235A3 EP2053235A3 (fr) 2009-11-04
EP2053235B1 true EP2053235B1 (fr) 2016-12-14

Family

ID=40219987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08017534.2A Active EP2053235B1 (fr) 2007-10-23 2008-10-07 Moteur à combustion interne doté d'injecteurs de carburant

Country Status (2)

Country Link
EP (1) EP2053235B1 (fr)
DE (1) DE102007050512A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009385A1 (de) 2008-02-14 2009-08-27 Volkswagen Ag Brennkraftmaschine
GB2546500B (en) 2016-01-19 2019-07-24 Perkins Engines Co Ltd Reversible injector clamp
DE102020004625A1 (de) 2020-07-30 2022-02-03 Deutz Aktiengesellschaft lnjektorverpratzung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8728518D0 (en) * 1987-12-05 1988-01-13 Lucas Ind Plc Clamping arrangement
JP2937081B2 (ja) 1995-06-26 1999-08-23 いすゞ自動車株式会社 燃料噴射ノズルの締付け装置
FR2763379B1 (fr) * 1997-05-16 1999-07-16 Renault Bride de fixation d'un injecteur
DE10155678A1 (de) * 2001-11-13 2003-05-22 Bosch Gmbh Robert Einspannvorrichtung für ein Kraftstoffeinspritzventil
FR2884876B1 (fr) * 2005-04-22 2007-08-03 Peugeot Citroen Automobiles Sa Dispositif de fixation pour le montage d'un porte-injecteur sur un moteur a combustion interne et moteur a combustion interne comprenant un tel dispositif

Also Published As

Publication number Publication date
EP2053235A3 (fr) 2009-11-04
EP2053235A2 (fr) 2009-04-29
DE102007050512A1 (de) 2009-04-30

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