EP2250365B1 - Élément distributeur de carburant - Google Patents

Élément distributeur de carburant Download PDF

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Publication number
EP2250365B1
EP2250365B1 EP09720768.2A EP09720768A EP2250365B1 EP 2250365 B1 EP2250365 B1 EP 2250365B1 EP 09720768 A EP09720768 A EP 09720768A EP 2250365 B1 EP2250365 B1 EP 2250365B1
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EP
European Patent Office
Prior art keywords
manifold
wall
annular groove
bottom wall
connection recess
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
EP09720768.2A
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German (de)
English (en)
Other versions
EP2250365A1 (fr
Inventor
Burkhard Harhoff
Markus Schmidt
Ludwig WIEDENLÜBBERT
Michael GIEßEL
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.)
Poppe and Potthoff GmbH
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Poppe and Potthoff 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.)
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Publication date
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Publication of EP2250365A1 publication Critical patent/EP2250365A1/fr
Application granted granted Critical
Publication of EP2250365B1 publication Critical patent/EP2250365B1/fr
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49947—Assembling or joining by applying separate fastener
    • Y10T29/49966—Assembling or joining by applying separate fastener with supplemental joining
    • Y10T29/49968—Metal fusion joining

Definitions

  • the invention relates to a fuel rail assembly with a manifold and at least one welded to the manifold connecting nipple for connecting a branch line.
  • the invention further relates to a manifold, a connection nipple for producing such a fuel rail assembly and method for producing a fuel rail assembly.
  • Such fuel rail assemblies are used for example in so-called common rail injection systems for diesel engines.
  • the distributor tube is acted upon by a high-pressure pump forth with high-pressure fuel, which is supplied to individual nozzles connected by branch lines connected to the manifold.
  • high-pressure fuel which is supplied to individual nozzles connected by branch lines connected to the manifold.
  • Ever higher demands on the exhaust gas quality of the engines require an increase in the injection pressures and thus the pressure resistance of such fuel rail subassemblies.
  • pressures in the order of 2500 bar are envisaged.
  • connection nipple has a wall, the inside and outside of which tapers towards the end to be welded to the manifold and ends in an annular projection.
  • the annular projection is insertable into an annular groove formed on a flat outer circumferential surface of the manifold. By fitting the projection into the groove, the welding current can be concentrated on the projection during an electric welding.
  • a fuel distributor assembly is known whose nipple terminates at its end to be welded to a formed in the outer surface of the manifold groove to be welded in a circumferential tip.
  • a reactor pressure vessel in which a forged nozzle housing is integrated with a forged nozzle.
  • the nozzle includes a bore which leads from an inner side of the nozzle housing to the outside.
  • the nozzle housing contains on its outer side, a reinforcing region into which the nozzle is machined such that an outer end of the nozzle does not extend beyond an outer surface of the reinforcing region.
  • a circumferential groove is incorporated, which allows access to an outer end of the nozzle during welding.
  • a high-pressure fuel storage with a hollow body and at least one transverse bore with a connection opening to the interior of the body known.
  • one or more indentations and / or recesses for stress relief of the pressurized high-pressure accumulator are preferably formed in the vicinity of the transverse bore on the outer and / or inner surface of the hollow body.
  • a fuel rail assembly is described in which around the mouth of a transverse bore in the outside of the manifold around a connection recess is formed, is welded to the bottom wall of the connection nipple. Radially outside the connection nipple, a radially outer region of the connection recess remains free, so that the remaining part of the bottom wall of the connection recess and its outer wall, at least in the apex region of the distributor tube, forms an annular groove at least partially surrounding the connection nipple.
  • a fuel rail assembly is known in which a conically shaped end face of a connecting nipple is connected to the outside of a manifold.
  • a fuel rail assembly is known with a nipple, which is welded to the bottom wall of a trained around the mouth of a transverse bore of the manifold around the connection recess.
  • the outer diameter of the connection recess is larger than the outer diameter of the connection nipple, so that an annular groove extending at least partially around the connection nipple remains.
  • the invention has for its object to provide a fuel rail assembly whose compressive strength is increased over conventional fuel rail assemblies.
  • the connecting nipple at least partially surrounding annular groove leads to an increase in the load capacity of the connection nipple.
  • the claims 7 and 8 identify embodiments of distribution pipes, as they can be used for a fuel rail assembly according to claim 1.
  • Claims 10 and 11 are directed to connection nipples, as they can be used for fuel rail assemblies according to claim 1.
  • Claims 9 and 10 are directed to methods for manufacturing a fuel rail assembly according to the invention.
  • Fig. 1 shows a section of a manifold 10, which may be welded along its length with a plurality of nipples 12.
  • a branch line not shown, connected in a conventional manner, via which an injection nozzle, in particular provided on a diesel engine injection nozzle, is supplied with fuel under high pressure.
  • a longitudinal bore 14 pass from the individual transverse bores 16 through the wall of the manifold 10, for example in the radial direction.
  • a transverse bore 16 is shown, which, for example, extends stepwise starting from the longitudinal bore 14 and ends in a concave mouth 18.
  • connection recess 20 preferably by machining, is formed on the outside of the distributor tube 10, wherein a milling tool can be oriented on the transverse bore 16.
  • the recess 20 has a the muzzle 18 facing, preferably parallel to the axis of the transverse bore 16 directed inside or inside wall 22, to which a preferably perpendicular to the axis of the longitudinal bore 14 directed bottom side or bottom wall 24 connects, via an annular groove 26 in a turn preferably parallel to the axis of the transverse bore 16 extending outside or outer wall 28 passes.
  • connection nipple 12 is welded to the annular groove 26 facing region of the bottom wall 24 of the connection recess 20.
  • Fig. 3 shows the part of the manifold 10, which in Fig. 1 is shown, prior to welding with the connection nipple 12th
  • Fig. 4 shows the in Fig. 2 shown part of the manifold 10th
  • the annular connection recess 20 is formed at a depth such that the inner wall 22 and at least the part of the bottom wall 24, with which the connection nipple 12 is welded, extend completely around the transverse bore 16.
  • the outer wall 28 and the outer wall 28 freestandingly connected to the bottom wall 24 annular groove 26 are only in the apex region of the outside of the manifold 10, ie in the areas of the outside, which are adjacent to the mouth 18 of the transverse bore 16 parallel to the axis of the manifold 10, complete educated.
  • the height of the outer wall 28 and then the depth of the annular groove 26 progressively decrease until, in the regions of the outer surface of the manifold 10 adjacent the mouth 18 transverse to the axis of the manifold 10, the annular groove 26 and the outer wall 28 completely missing, as in Fig. 4 shown.
  • the wall of the manifold 10 is only minimally weakened or removed.
  • the annular groove 26 is preferably formed such that it extends the outer wall 28 steadily and in arcuate cross-section, for example circular arc, merges into the bottom wall 24, wherein the adjoining the bottom wall 24 portion of the wall of the annular groove can advantageously be inclined to the axis of the transverse bore 16 and the annular groove in cross-section over can extend a circumferential angle ⁇ 180 °.
  • the cross-sectional shape of the annular groove does not have to be circular in shape; it can be elliptical, U-shaped or otherwise suitable.
  • Fig. 5 shows a cross section through the connecting nipple 12 prior to its welding to the manifold 10.
  • the connecting nipple 12 is a generally cylindrical member having an inner wall, according to Fig. 5 From above, first of all has a conically tapering region 30, which merges over a cylindrical region 32 with axially parallel inner wall into a conically widening region 34.
  • connection nipple 12 in the example shown according to Fig. 5 in its upper region preferably has an external thread 36, and merges via a conically widening region 38 into a cylindrical region 40, which merges via a tapered region 42 into an annular contact surface 44, which is preferably directed approximately perpendicular to the axis of the connection nipple 12 and connects the region 42 with the inside region 34.
  • the annular contact surface 44 may be formed as a more or less narrow cutting edge or as a distinct annular surface with a small width. The contact surface 44 is such that, when inserting the connection nipple 12 into the connection recess 20, it completely comes into contact with the bottom wall 24, preferably radially within the transition between the bottom wall 24 and the annular groove 26.
  • the nipple 12 When the nipple 12 is inserted into the terminal recess 20, it is preferably welded to the distribution tube 10 by capacitor discharge welding, whereby the contact surface 44 widened by melting the material and has an in Fig. 1 designated 46 welding zone is formed, in which the end face material of the connecting nipple 12 is welded to the material of the manifold 10 in the region of the bottom wall 24.
  • connection nipple 12 is advantageously such that the inside of the connection nipple 12 does not touch the inside wall 22 of the connection recess 20 and that the annular groove 26 is covered or filled to a slight extent in its radially inner region by the material melting during welding ,
  • connection nipple 12 at its end facing the manifold 10 end portion in the manner of a manifold 10 to conically tapered annular bead 48 (FIG. Fig. 5 ) is formed, and reaches the manifold 10, the strength of which is surprisingly significantly increased by preferably extending with a curved bottom annular groove 26.
  • connection nipple 12 to the manifold 10 is not necessarily a capacitor discharge welding method used, but the welding can be done by laser welding and other known welding methods. It is advantageous to tune the front end of the connecting nipple 12 to the bottom wall 24 in such a way that the annular groove 26 is maintained and the smallest possible notch effect emanates from the welding point, in particular on the outside of the connecting nipple. For this, a small angle ⁇ ( Fig. 5 ) advantageous.
  • the annular groove 26 has been formed in the terminal recess 20 prior to welding the terminal nipple 12 to the bottom wall 24 of the terminal recess 20.
  • the annular groove 26 can be formed only after the welding of the connecting nipple 12 with the outside of the manifold 10 and the bottom wall 24 of the connection recess 20, for example by milling.
  • the connection recess 20 first with opposite Fig. 3 lesser radial extent in the direction away from the transverse bore 16 are formed, so that the connection nipple 12 is inserted into the connection recess 20.
  • the welding zone 46 is formed whose radial extension through the flow of the material is generally greater than the radial extent of the contact surface 44 of the not yet welded connection nipple 12.
  • the Ring groove 26 is formed by, for example, radially outside of the connection nipple 12 under axial feed movement a milling tool is moved around the connection nipple 12 around.
  • a part of the material of the welding zone can be removed, so that the in Fig. 1 visible undercut in the transition from the connection recess 20 to the radial outer side of the connection nipple 12 does not necessarily have to be present.
  • the depth of the annular groove is advantageously deeper than the previously formed connection recess 20.
  • connection nipple 12 The in Fig. 1 Visible distance between the inside of the connection nipple 12 and the inner wall 22 of the connection recess 20 is advantageously relatively small for proper centering of the connection nipple 12 in the connection recess 20. A contact should not be present in this area, however, in order to ensure that the welding takes place only in the region of the bottom wall 24 of the connection recess 20.
  • Fig. 6 shows an example in which the manifold 10 and the connection nipple 12 are made, for example, by forging as a unitary material assembly.
  • the connection recess is missing altogether.
  • the outside of the connecting nipple 12 passes directly into the outside or surface of the distributor tube 10.
  • the annular groove 26 is formed, which has a cross section similar to Fig. 1 has shown.
  • the example according to Fig. 7 differs from the example according to Fig. 6 in that the radially inner side of the annular groove 26 is free of undercuts in the outside the connecting nipple 12 passes, wherein the inside wall of the annular groove 26 extends approximately parallel to the axial direction of the connecting nipple or the transverse bore 16.
  • FIG. 8 shows one of the FIG. 1 similar view of another example of the assembly.
  • This example has, in addition to the annular groove 26, a further inner annular groove 50, via which the inside of the connecting nipple 12 merges into the outside of the distributor tube 10.
  • the inner annular groove 50 surrounds the mouth 18 of the transverse bore 16 at a distance such that the mouth 18 is sufficiently stable for pressing a front end of a branch pipe attached to the connection nipple 12, without the wall of the radially inner side of the inner annular groove 50 is deformed.
  • the inner annular groove 50 can be introduced into this connection recess 20 so that the radially inner side of the inner annular groove 50 extends the inner wall 22 of the connection recess 20 into the distributor tube 10.
  • the inner annular groove 50 can be formed only after the welding of the connecting nipple 12 to the connecting recess 20. Even with the one-piece with the manifold 10 training the connection nipple 12, the inner annular groove 50 can be milled in addition.
  • angle of inclination a and ⁇ of the inside or outside of the conically tapering portion 42 and the radial width of the contact surface 44 are selected such that a weld zone 46 is formed, which reduces the formation of annular notches in the transition from an annular groove in the connection nipple. If an annular groove is milled only after welding of the connecting nipple 12 to the distributor pipe 10, the nipple 12 can be milled to a sufficiently wide welding zone 46 so far that the undercut in the transition from the annular bead 48 (FIG. Fig. 5 ) of the connection nipple to the manifold 10 is largely or completely eliminated.
  • connection nipple 12 a branch line (not shown) can be secured in a conventional manner by means of a union nut, which presses the branch line sealingly against the conical region 30 or the mouth 18.
  • the connection nipple 12 can be designed in a variety of ways and is not limited to the training with an external thread.

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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 (10)

  1. Ensemble distributeur de carburant comprenant un tube distributeur (10) et au moins un nipple de raccordement (12) pour raccorder une conduite dérivée à un orifice transversal (16) passant à travers la paroi du tube distributeur (10),
    un évidement de raccordement (20) pourvu d'une paroi intérieure périphérique (22), d'une paroi de fond périphérique (24) et d'une paroi extérieure (28) présente au moins dans la région du sommet du côté extérieur du tube distributeur (10) étant formé tout autour de l'embouchure (18) du côté extérieur de l'orifice transversal (16) et une surface frontale du nipple de raccordement (12) orientée vers le tube distributeur étant soudée à la paroi de fond (24),
    caractérisé en ce que
    le côté extérieur du nipple de raccordement (12) se fond dans le côté extérieur du tube distributeur par l'intermédiaire d'une rainure annulaire (26) entourant au moins en partie le côté extérieur du nipple de raccordement, au moins dans les régions de la paroi de fond (24) qui sont voisines de l'orifice transversal (16) dans la direction parallèle à l'axe du tube distributeur, la rainure annulaire (26) étant formée dans le tube distributeur (10) à une profondeur s'étendant jusqu'en dessous du niveau de la paroi de fond (24).
  2. Ensemble distributeur de carburant selon la revendication 1, caractérisé en ce que le nipple de raccordement (12) est espacé de la paroi intérieure (22) et de la paroi extérieure (28) de l'évidement de raccordement (20).
  3. Ensemble distributeur de carburant selon la revendication 1 ou 2, caractérisé en ce que la rainure annulaire (26) prolonge la paroi extérieure (28) de l'évidement de raccordement (20) en direction du côté intérieur du tube distributeur (10) en dessous du niveau de la paroi de fond (24) et en ce que la rainure annulaire (26) se termine dans la direction radiale par rapport à l'orifice transversal (16) du côté intérieur sur le côté extérieur de la soudure (46) du nipple de raccordement (12) avec la paroi de fond (24).
  4. Ensemble distributeur de carburant selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la surface frontale du nipple de raccordement (12) est soudée à la paroi de fond (24) de l'évidement de raccordement (20) par décharge de condensateur.
  5. Ensemble distributeur de carburant selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le côté intérieur du nipple de raccordement (12) se fond dans une rainure annulaire (50) intérieure qui est formée dans le côté intérieur du tube distributeur (10) et qui entoure à distance l'embouchure (18) de l'orifice transversal (16) dans le côté extérieur du tube distributeur.
  6. Ensemble distributeur de carburant selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la rainure annulaire (26) entourant le nipple de raccordement (12) présente une section transversale environ en forme de segment d'arc de cercle en coupe longitudinale à travers le tube distributeur (10).
  7. Tube distributeur (10) pour fabriquer un ensemble distributeur de carburant selon l'une quelconque des revendication 1 à 4, comprenant un orifice transversal (16) passant à travers la paroi du tube distributeur (10), un évidement de raccordement (20) disposé tout autour de l'embouchure (18) du côté extérieur de l'orifice transversal (16) et pourvu d'une paroi intérieure (22) périphérique, d'une paroi de fond (24) périphérique et d'une paroi extérieure (28) présente au moins dans la région du sommet du côté extérieur du tube distributeur (10) et une rainure annulaire (26) formée dans l'évidement de raccordement, dont la largeur mesurée dans le prolongement de la paroi de fond (24) est approximativement égale à la moitié de la distance entre la paroi intérieure (22) et la paroi extérieure (28) de l'évidement de raccordement (20) et dont le côté intérieur est incliné en direction de la paroi de fond à la transition vers la paroi de fond (24).
  8. Tube distributeur selon la revendication 7, caractérisé en ce que la profondeur de la rainure annulaire (26) est inférieure à la moitié de sa largeur.
  9. Procédé de fabrication d'un ensemble distributeur de carburant comprenant un tube distributeur et au moins un nipple de raccordement (12) soudé au tube distributeur pour le raccordement d'une conduite dérivée, lequel ensemble distributeur de carburant contient un orifice transversal (16) passant à travers la paroi du tube distributeur (10) et un évidement de raccordement (20) disposé tout autour de l'embouchure (18) du côté extérieur de l'orifice transversal (16), pourvu d'une paroi intérieure (22) périphérique, d'une paroi de fond (24) périphérique et d'une paroi extérieure (28) présente au moins dans la région du sommet du côté extérieur du tube distributeur (10),
    lequel procédé comprend les étapes suivantes :
    formation de l'évidement de raccordement (20) de telle manière que sa paroi extérieure (28) se fonde dans la paroi de fond (24) par l'intermédiaire d'une rainure annulaire (26) s'étendant jusqu'en dessous du niveau de la paroi de fond et ensuite
    Insertion du nipple de raccordement (12) dans l'évidement de raccordement et soudage d'une surface frontale du nipple de raccordement (12) orientée vers le tube distributeur (10) à une région de la paroi de fond (24) de l'évidement de raccordement (20) située radialement à l'intérieur de la rainure annulaire (26).
  10. Procédé de fabrication d'un ensemble distributeur de carburant comprenant un tube distributeur et au moins un nipple de raccordement (12) soudé au tube distributeur pour le raccordement d'une conduite dérivée, lequel ensemble distributeur de carburant contient un orifice transversal (16) passant à travers la paroi du tube distributeur (10) et un évidement de raccordement (20) disposé tout autour de l'embouchure (18) du côté extérieur de l'orifice transversal (16), pourvu d'une paroi intérieure (22) périphérique, d'une paroi de fond (24) périphérique et d'une paroi extérieure (28) présente au moins dans la région du sommet du côté extérieur du tube distributeur (10),
    lequel procédé comprend les étapes suivantes :
    insertion du nipple de raccordement (12) dans l'évidement de raccordement (20), soudage d'une surface frontale du nipple de raccordement (12) orientée vers le tube distributeur (10) à la paroi de fond (24) de l'évidement de raccordement (20) et ensuite
    formation d'une rainure annulaire (26) entourant au moins en partie le nipple de raccordement dans la paroi de fond à une profondeur s'étendant jusqu'en dessous du niveau de la paroi de fond, dont la région radiale intérieure est adjacente à une zone de soudure (46) entre le nipple de raccordement (12) et la paroi de fond (24) ou part de celle-ci.
EP09720768.2A 2008-03-11 2009-03-04 Élément distributeur de carburant Active EP2250365B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008013575A DE102008013575B3 (de) 2008-03-11 2008-03-11 Kraftstoffverteilerbaugruppe
PCT/EP2009/001531 WO2009112191A1 (fr) 2008-03-11 2009-03-04 Élément distributeur de carburant

Publications (2)

Publication Number Publication Date
EP2250365A1 EP2250365A1 (fr) 2010-11-17
EP2250365B1 true EP2250365B1 (fr) 2014-05-21

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EP09720768.2A Active EP2250365B1 (fr) 2008-03-11 2009-03-04 Élément distributeur de carburant

Country Status (6)

Country Link
US (1) US8419073B2 (fr)
EP (1) EP2250365B1 (fr)
JP (1) JP5221684B2 (fr)
BR (1) BRPI0909753B1 (fr)
DE (1) DE102008013575B3 (fr)
WO (1) WO2009112191A1 (fr)

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US20110012342A1 (en) 2011-01-20
BRPI0909753B1 (pt) 2019-12-03
BRPI0909753A2 (pt) 2015-10-06
WO2009112191A1 (fr) 2009-09-17
JP5221684B2 (ja) 2013-06-26
DE102008013575B3 (de) 2009-08-13
JP2011513646A (ja) 2011-04-28
EP2250365A1 (fr) 2010-11-17
US8419073B2 (en) 2013-04-16

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