EP0403871B1 - Brennstoffsammelleitung, vorzugsweise aus Kunststoff, zur Brennstoffversorgung der Injektoren eines Brennstoffeinspritzsystems eines Verbrennungsmotors - Google Patents

Brennstoffsammelleitung, vorzugsweise aus Kunststoff, zur Brennstoffversorgung der Injektoren eines Brennstoffeinspritzsystems eines Verbrennungsmotors Download PDF

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Publication number
EP0403871B1
EP0403871B1 EP90110595A EP90110595A EP0403871B1 EP 0403871 B1 EP0403871 B1 EP 0403871B1 EP 90110595 A EP90110595 A EP 90110595A EP 90110595 A EP90110595 A EP 90110595A EP 0403871 B1 EP0403871 B1 EP 0403871B1
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EP
European Patent Office
Prior art keywords
fuel
tubular element
pressure regulator
manifold
connector
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 - Lifetime
Application number
EP90110595A
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English (en)
French (fr)
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EP0403871A1 (de
Inventor
Stefano Morara
Innocenzo Triolo
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Weber SRL
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Weber SRL
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Application filed by Weber SRL filed Critical Weber SRL
Publication of EP0403871A1 publication Critical patent/EP0403871A1/de
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Publication of EP0403871B1 publication Critical patent/EP0403871B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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

Definitions

  • the present invention relates to a fuel manifold utilised in association with fuel supply devices for an internal combustion engine, of the type including electromagnetically actuated fuel injection valves.
  • devices of this type normally include a manifold of tubular form which is provided with a plurality of seats for the fuel injection valves and a fuel inlet connection connected to a fuel pipe. Further, such a manifold is normally provided with a further connector which is connected via a suitable pipe to a pressure regulator the function of which is to maintain the fuel pressure in the manifold substantially constant. When this pressure exceeds a predetermined value a part of the fuel is discharged from the interior of the manifold towards a discharge opening with which the pressure regulator is provided, in such a way as appropriately to reduce the pressure within the manifold.
  • the pressure regulator is therefore provided with a fuel inlet connector adapted to be connected to the manifold outlet connector as indicated above, and also with an outlet connector which is adapted to be connected, via a further pipe, to the fuel reservoir.
  • Fuel manifolds of the type briefly described have several disadvantages. First of all, they are the cause of a rather high pressure drop because of the length of the ducts which connect the manifold to the pressure regulator and because of the form and type of connections which are necessary to achieve the connections themselves; these pressure drops detrimentally affect the operation of the fuel injection valves.
  • a fuel manifold formed by a first tubular element adapted to define the casing of the manifold which is provided with a fuel inlet connector and a fuel outlet connector and an attachment flange for a pressure regulator and by a second tubular element disposed within the interior of the first; said tubular elements define an annular duct lying between the outer surface of the second and the inner surface of the first element and adapted to supply fuel to the seats of the fuel injectors which are formed on the first element, whilst the second tubular element defines within its interior a discharge duct for fuel from the pressure regulator.
  • a fuel manifold of this type has some disadvantages.
  • the object of the present invention is that of providing a pressure regulator of the type first indicated, by means of which it is possible to eliminate the disadvantages which have been described and which, therefore, will not experience a substantial pressure drop in the fuel passage, and to completely eliminate the regions in which leakage could take place, and give rise to a very compact constructional arrangement adapted therefore to be utilised in applications of any type.
  • a fuel manifold adapted to supply fuel to the injectors of a fuel injection device of an internal combustion engine, the said device including a pressure regulator which is adapted to maintain substantially constant the fuel pressure supplied to the said fuel injectors and which is provided with a bottom wall in which is formed a fuel inlet and from which projects a fuel discharge connector for discharging fuel from the manifold itself
  • said fuel manifold comprising: a first tubular element adapted to define the manifold casing, which is provided with a plurality of seats for housing the said fuel injectors, a fuel inlet connector and a fuel outlet connector and an attachment flange for the said pressure regulator; a second tubular element disposed within the first and one end of which is adapted to be connected to the said discharge connector of the said pressure regulator and a second end of which is adapted to be connected to the said fuel outlet connector of the said first tubular element; the said first and second tubular elements defining an annular duct lying between the outer surface of the second and the inner surface
  • the fuel manifold of the invention can form part of a fuel supply device for an internal combustion engine of the type in which the fuel is supplied by means of electromagnetically actuated injectors.
  • This device includes a pressure regulator which is adapted to maintain substantially constant the fuel pressure supplied to injectors of known type; conveniently this pressure regulator is of the type such as that shown in Figure 1, in which it has been indicated with the reference numeral 1, comprising a bottom wall 2 in which is formed a fuel inlet opening 3 and from which projects a fuel discharge connector 4.
  • a pressure regulator of this type is described in Italian Patent application No 68 054-A/88 filed 25 November 1988 by the same applicant and entitled: "A pressure regulator device for the fuel circuit of a supply installation of an internal combustion engine".
  • the fuel manifold of the invention substantially comprises a first tubular element 5 adapted to define the manifold casing which is provided with a plurality of seats 6 for housing fuel injection valves (not shown).
  • This tubular element is further provided with an inlet connector 7 and an outlet connector 8 for the fuel, as well as an attachment flange 9 for the pressure regulator 1.
  • the manifold further includes a second tubular element 12 disposed within the first, one end 13 of which is adapted to be connected to the discharge connector 4 of the pressure regulator 1 and the other end 14 of which is adapted to be connected to the outlet connector 8 of the tubular element 5.
  • the two tubular elements 5 and 12 therefore define an annular duct 15 which lies between the outer surface 16 of the element 12 and the inner surface 17 of the element 5 and which is arranged to supply fuel to the seats 6 of the injection valves; the tubular element 12 defines within it a fuel discharge duct 18 for fuel from the pressure regulator 1 being discharged.
  • the end 14 of the tubular element 12 is sealingly snap-engaged to the outlet connector 8 of the tubular element 5.
  • the tubular element 12 includes at least one resiliently deformable tongue 19 (Figure 2), preferably a pair of such tongues, which project from the end 14 and is or are provided with a stop tooth 20 adapted to snap against a corresponding shoulder 21.
  • This end conveniently includes a conical section 22 adapted to cooperate with a corresponding seat 23 of the tubular element 5, as well as a cylindrical section 24 which lies between the tongues 19 and the conical section 22 and is adapted to couple into a corresponding hole 25 of the element 5; a sealing ring 26 is interposed between the cylindrical section 24 and a corresponding annular seat formed on the tubular element 5.
  • the fuel inlet connector 7 and fuel outlet connector 8 project laterally from one end of the element 5 as is clearly seen in the drawings; in particular the outlet connector 8 is provided with a opening 27 which opens into the hole 25 in which the cylindrical section 24 of the element 12 is coupled; moreover the teeth 20 of the resiliently deformable tongues 19 are adapted to snap against the surface 21 of the hole itself, which therefore constitutes the shoulder for the said teeth.
  • Each tooth 20, as can be seen from Figure 3, is delimited laterally and above by curved surfaces which are adapted to cooperate with the surface 21 of the opening 27 of the outlet connector 8, in such a way that when the tubular element 12 is made to rotate axially with respect to the tubular element 5 the teeth 20 are released from the surface 21 by deforming the tongues 19 resiliently to allow the tubular element 12 to be separated from the other element 5: the position in which the teeth 20 are found at the end of this operation is shown in broken outline in Figure 3.
  • the tubular element 12 is provided with grip means, generally indicated 28 ( Figure 4) which can be constituted by simply radial teeth formed on the end 13 of the element 12 and which are adapted to control the rotation of the element to cause the release of the teeth 20 in the manner described above.
  • the pressure regulator includes an attachment collar 30 adapted to contact the flange 9 of the tubular element 5; to connect the pressure regulator to the tubular element 5 a fork 31 is utilised comprising a pair of arms 32 (Figure 14) of substantially C-shape and adapted to engage the collar 9 that is clearly seen in Figure 4; the fork is further provided with a pair of teeth projecting radially inwardly of the fork, indicated 33 ( Figure 14), which are positioned in such a way as to engage on the inner surface 34 of the flange 9 when the fork contacts the collar 30.
  • This fork is then provided with at least one hole 35 for a fixing screw 36 to fix the fork to the flange and consequently to lock the pressure regulator 1 with respect to the tubular element 5.
  • the end 14 of the tubular element 12 has a cylindrical seat 37 ( Figure 4) adapted to house the end of the discharge connector 4 of the pressure regulator 1. Further, the tubular element 5 has a cylindrical seat 38 formed close to the flange 9 and between this and the casing 39 of the pressure regulator there is interposed a sealing ring 14. Similarly, between the discharge connector 4 and the seat 37 there is interposed another sealing ring 41.
  • the tubular element 5 then has an attachment flange 42 provided with holes adapted to allow the connection of the manifold to the engine block.
  • the two tubular elements 5 and 12 are conveniently made of a synthetic material, preferably a thermoplastic material by utilising the usual forming technology for injection moulding. Although each of these elements is formed with the members and parts which have been described above it has a very simple form and requires for its construction a mould of non-complex structure; in particular, because of the shape and arrangement of the various parts and the manner with which these are connected together, the tubular elements 5 and 12 have no over square corners and therefore can easily be produced by injection moulding at high production speeds and low costs.
  • the manifold described operates in the same manner as usual in manifolds of the same type; the fuel under pressure is supplied from the inlet connector 7 and therefore to the interior of the annular duct 15 defined between the tubular element 12 and the tubular element 5; from this duct fuel is supplied directly to the injection valve seats 6. Simultaneously the fuel from the duct 15 passes through the hole 3 in the bottom wall 2 of the pressure regulator 1 to the interior of the regulator itself: when the fuel pressure within the duct 15 exceeds a predetermined value a part of this fuel is discharged, in a known way, from the pressure regulator through the discharge connector 4 into the discharge duct 18 defined within the tubular element 12 and by this discharge duct, through the discharge connector 8.
  • the manifold of the invention has a very simple structure, is compact and of small dimensions and lends itself therefore to be utilised in association with a fuel supply device intended for any type of application.
  • the pressure drop which occurs during movement of fuel within the manifold itself is very low because of the short length of the various duct sections which connect the members of the regulator itself and because of the form of these ducts: consequently the speed of response of the injection valves which are supplied by the manifold is very high.
  • the manifold has a very high reliability because the risk of leakages between the various parts of the manifold is avoided: in fact, the joints formed between the various parts are very secure and have a perfect seal.

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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 (6)

  1. Kraftstoffverteiler, der geeignet ist, die Einspritzdüsen einer Kraftstoffeinspritzanlage einer Verbrennungskraftmaschine mit Kraftstoff zu versorgen, mit einem Druckregler (1), der geeignet ist, den an die Kraftstoffeinpritzdüsen angelegten Kraftstoffdruck im wesentlichen konstant zu halten, und der mit einer Endwand (2) versehen ist, in der ein Kraftstoffeinlaß (3) ausgebildet ist und aus der ein Kraftstoffabflußverbindungsstück (4) zum Abfließen von Kraftstoff aus dem Verteiler hervorsteht, wobei der Kraftstoffverteiler enthält:
    ein erstes Rohrelement (5), das geeignet ist, das Verteilergehäuse zu bilden und das versehen ist mit mehreren Sitzen (6) zum Aufnehmen der Kraftstoffeinspritzdüsen, einem Kraftstoffeinlaßverbindungsstück (7), einem Kraftstoffauslaßverbindungsstück (8) und einem Befestigungsflansch (9) für den Druckregler;
    ein zweites Rohrelement (12), das in dem ersten angeordnet und dessen eines Ende (13) geeignet ist, mit dem Abflußverbindungsstück (4) des Druckreglers (4) verbunden zu werden und dessen zweites Ende (14) geeignet ist, mit dem Kraftstoffauslaßverbindungsstück (4) des ersten Rohrelementes verbunden zu werden;
    wobei das erste und das zweite Rohrelement (5, 12) eine ringförmige Leitung (15) bilden, die zwischen der Außenfläche (16) des zweiten und der Innenfläche (17) des ersten Elementes liegt und geeignet ist, die Sitze (6) der Kraftstoffeinspritzdüsen mit Kraftstoff zu versorgen, und wobei das zweite Rohrelement (12) in seinem Inneren eine Kraftstoffabflußleitung (18) vom Druckregler definiert,
    wobei das zweite Ende (14) des zweiten Rohrelementes (12) wenigstens eine elastisch verformbare Zunge (19) enthält, die axial von dem zweiten Ende (14) hervorsteht und mit einem Stopzahn (20) versehen ist, der geeignet ist, an einer entsprechenden Schulter (21) des ersten Rohrelementes (5) einzuschnappen, wobei das zweite Ende (14) des zweiten Rohrelementes einen konischen Abschnitt (22) enthält, der geeignet ist, mit einem entsprechenden konischen Sitz des ersten Rohrelementes (5) und mit einem zwischen der Zunge (19) und dem konischen Abschnitt (22) liegenden zylindrischen Abschnitt (24) zusammenzuwirken und geeignet ist, in ein entsprechendens Loch (25) des ersten Rohrelementes einzugreifen, wobei ein Dichtring (26) zwischen dem zylindrischen Abschnitt (24) und einem entsprechenden ringförmigen Sitz auf dem ersten Rohrelement angeordnet ist.
  2. Verteiler nach Anspruch 1, dadurch gekennzeichnet, daß das Kraftstoffeinlaßverbindungsstück (7) und das Kraftstoffauslaßverbindungsstück (8) des ersten Rohrelementes (5) seitlich von einem Ende des Elementes hervorstehen und daß der Befestigungsflansch (9) für den Druckregler (1) axial von einem Ende des ersten Rohrelementes (5) hervorsteht, wobei das Auslaßverbindungsstück (8) mit einer Auslaßöffnung (27) versehen ist, die sich in die Öffnung (25) des ersten Rohrelementes öffnet, mit dem der zylindrische Abschnitt des zweiten Rohrelementes verbunden ist und wobei der Zahn (20) der elastisch verformbaren Zunge (19) geeignet ist, an der Fläche (21) der Auslaßöffnung (27) des Auslaßverbindungsstückes einzuschnappen.
  3. Verteiler nach Anspruch 2, dadurch gekennzeichnet, daß die elastisch verformbare Zunge (19) mehr als einen Zahn (20) enthält und daß jeder der Zähne (20) seitlich und oben durch gekrümmte Flächen begrenzt ist, die geeignet sind, mit der Fläche (27) der Auslaßöffnung des Auslaßverbindungsstücks derart zusammenzuwirken, daß, wenn diese axial bezüglich des ersten Rohrelementes (5) gedreht wird, die Zähne (20) von der Fläche der Auslaßöffnung (27) durch elastisches Verformen der Zunge (19) gelöst werden, um eine Trennung des zweiten Rohrelementes (12) von dem ersten (5) zu ermöglichen.
  4. Verteiler nach Anspruch 3, dadurch gekennzeichnet, daß das zweite Rohrelement (12) mit Greifmitteln (28) versehen ist, die auf dem ersten Ende (13) ausgebildet und geeignet sind, die Drehung des Elementes zum Bewirken des Lösens der Zähne (20) von der Fläche der Auslaßöffnung (27) des Auslaßverbindungsstückes des ersten Rohrelementes zu steuern.
  5. Verteiler nach einem der vorhergehenden Ansprüche, bei welchem der Druckregler (1) einen Befestigungsbund (30) enthält, der geeignet ist, am Befestigungsflansch (9) des ersten Rohrelementes anzugreifen, dadurch gekennzeichnet, daß er eine Gabel (31) enthält, die mit zwei im wesentlichen C-förmigen Armen (32) versehen ist, die geeignet sind, am Bund (30) anzugreifen, und die mit zwei Zähnen (33) versehen ist, die radial nach dem Inneren der Gabel vorstehen und so positioniert sind, daß sie an einer Fläche (34) des Flansches angreifen, wenn die Gabel am Bund angreift und wobei die Gabel mit wenigstens einem Loch (35) für eine Befestigungsschraube (36) zum Befestigen der Gabel am Flansch zum Sichern des Druckreglers durch die Gabel am Rohrelement versehen ist.
  6. Verteiler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das erste Ende (13) des zweiten Rohrelementes (12) einen zylindrischen Sitz (37) für das Auslaßverbindungsstück (4) des Druckreglers besitzt und daß das erste Rohrelement (5) einen zylindrischen Sitz (38) besitzt, der in der Nähe des Flansches ausgebildet und geeignet ist, das Gehäuse des Druckreglers aufzunehmen, wobei zwischen dem Auslaßverbindungsstück (4) und dem zugehörigen Sitz (37) sowie zwischen dem Gehäuse des Druckreglers und dem Sitz (38) ein Dichtring angeordnet ist.
EP90110595A 1989-06-13 1990-06-05 Brennstoffsammelleitung, vorzugsweise aus Kunststoff, zur Brennstoffversorgung der Injektoren eines Brennstoffeinspritzsystems eines Verbrennungsmotors Expired - Lifetime EP0403871B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6747789 1989-06-13
IT8967477A IT1234285B (it) 1989-06-13 1989-06-13 Collettore di carburante preferibilmente in materiale plastico atto adalimentare carburante agli iniettori di un dispositivo di alimentazione per un motore a combustione interna

Publications (2)

Publication Number Publication Date
EP0403871A1 EP0403871A1 (de) 1990-12-27
EP0403871B1 true EP0403871B1 (de) 1994-01-05

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EP90110595A Expired - Lifetime EP0403871B1 (de) 1989-06-13 1990-06-05 Brennstoffsammelleitung, vorzugsweise aus Kunststoff, zur Brennstoffversorgung der Injektoren eines Brennstoffeinspritzsystems eines Verbrennungsmotors

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EP (1) EP0403871B1 (de)
BR (1) BR9002731A (de)
DE (1) DE69005714T2 (de)
ES (1) ES2049861T3 (de)
IT (1) IT1234285B (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1241694B (it) * 1990-09-28 1994-01-31 Weber Srl Collettore di alimentazione del carburante per un dispositivo di alimentazione per un motore a combustione interna del tipo provvisto di valvole dosatrici e polverizzatrici di carburante ad azionamento elettromagnetico
IT220614Z2 (it) * 1990-09-28 1993-10-06 Weber Srl Collettore di alimentazione del carburante per un dispositivo di alimentazione di un motore a combustione interna in grado di esplicare un'azione di smorzamento delle vibrazioni
DE4111988C2 (de) * 1991-04-12 1994-07-14 Bosch Gmbh Robert Brennstoffverteiler
DE4115039A1 (de) * 1991-05-08 1992-11-12 Bosch Gmbh Robert Brennstoffverteiler
SE468719B (sv) * 1991-07-02 1993-03-08 Saab Scania Ab Arrangemang foer braensleledning vid foerbraenningsmotor
IT227559Y1 (it) * 1992-05-21 1997-12-15 Weber Srl Collettore per un dispositivo di alimentazione di carburante ad un mo- tore a combustione interna.
IT232907Y1 (it) * 1993-05-17 2000-01-21 Weber Srl collettore per un dispositivo di alimentazione di carburante ad un motore a combustione interna.
DE19927467A1 (de) * 1999-06-16 2000-12-21 Volkswagen Ag Vorrichtung zur Verteilung von Kraftstoff für eine Brennkraftmaschine
EP1424493A1 (de) * 2000-10-25 2004-06-02 Siemens VDO Automotive Inc. Verfahren zur Herstellung einer Kraftstoffeinrichtung
GB2395538B (en) * 2002-11-25 2006-03-29 Falmer Investment Ltd A coupling device
GB2395537B (en) * 2002-11-25 2006-04-26 Falmer Investment Ltd A fluid distribution device
FR2950396B1 (fr) * 2009-09-22 2012-04-27 Mark Iv Systemes Moteurs Sa Module fonctionnel integrant un repartiteur et une rampe d'injection et son procede de fabrication
DE102010048161A1 (de) * 2010-10-11 2012-04-12 Volkswagen Ag Kraftstoff-Verteilerleiste für eine Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990013741A1 (de) * 1989-05-02 1990-11-15 Robert Bosch Gmbh Kraftstoffverteiler für kraftstoffeinspritzanlagen von brennkraftmaschinen

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
US4756289A (en) * 1986-02-12 1988-07-12 General Motors Corporation Self-contained fuel pressure regulator
US4836246A (en) * 1987-08-03 1989-06-06 Colt Industries Inc. Manifold for distributing a fluid and method for making same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990013741A1 (de) * 1989-05-02 1990-11-15 Robert Bosch Gmbh Kraftstoffverteiler für kraftstoffeinspritzanlagen von brennkraftmaschinen

Also Published As

Publication number Publication date
IT1234285B (it) 1992-05-14
IT8967477A0 (it) 1989-06-13
BR9002731A (pt) 1991-08-20
EP0403871A1 (de) 1990-12-27
DE69005714D1 (de) 1994-02-17
ES2049861T3 (es) 1994-05-01
DE69005714T2 (de) 1994-06-30

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