EP0915253B1 - Dispositif d'injection de combustible à haute pression pour moteurs à combustion interne, notamment pour moteurs Otto - Google Patents

Dispositif d'injection de combustible à haute pression pour moteurs à combustion interne, notamment pour moteurs Otto Download PDF

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Publication number
EP0915253B1
EP0915253B1 EP98117925A EP98117925A EP0915253B1 EP 0915253 B1 EP0915253 B1 EP 0915253B1 EP 98117925 A EP98117925 A EP 98117925A EP 98117925 A EP98117925 A EP 98117925A EP 0915253 B1 EP0915253 B1 EP 0915253B1
Authority
EP
European Patent Office
Prior art keywords
injection
connecting piece
injection device
injection nozzle
disposed
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
EP98117925A
Other languages
German (de)
English (en)
Other versions
EP0915253A3 (fr
EP0915253A2 (fr
Inventor
Hermann Meindl
Franz Kreil
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0915253A2 publication Critical patent/EP0915253A2/fr
Publication of EP0915253A3 publication Critical patent/EP0915253A3/fr
Application granted granted Critical
Publication of EP0915253B1 publication Critical patent/EP0915253B1/fr
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
    • 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
    • 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

Definitions

  • the invention relates to a preamble of claim 1 High-pressure fuel injection device for an internal combustion engine, in particular Otto engine, with an injection nozzle directed directly into a combustion chamber, which can be arranged with a connecting piece on the machine housing High-pressure fuel reservoir by means of a plug connection with a tolerance compensating elastic sealing element is connectable.
  • a high pressure fuel injector is known from JP 08 121285 A.
  • the invention is based, for a generic high-pressure fuel injection device the task to show training that takes into account the acting combustion chamber pressure in connection with the need for compensation component tolerances in construction and assembly is simple.
  • an assembly unit has at least two connecting pieces for injection nozzles comprises, each via a cylindrical plug-in extension with radial play are arranged in a fuel supply line in the respective connecting piece Interposition of an O-ring as an elastic sealing element and that everyone Plug-in extension also has a groove arrangement on the injection nozzle side for receiving a plate spring as a force-transmitting spring element between each Connection piece and respective injection nozzle.
  • each connector on the injector side one of the plug-in extension the injection nozzle receiving supply line axially upstream recess has for the arrangement of arranged on the plate spring retaining tabs which outward locking tongues in openings in which the recess intervene positively in the limiting jacket of each connection piece.
  • the plate spring retaining tabs Preferably are disc spring and retaining tabs with locking tongues in one piece educated.
  • a first, relatively thick-walled, preferably slotted Belleville spring is provided as an essentially force-transmitting spring element and that a second, relatively thin-walled, also slotted disc spring in one piece is designed with retaining tabs, both disc springs arranged in the same direction are to increase the spring force.
  • the retaining tabs each have a step-shaped section with the edge area the disc spring are connected, and those in the gap recesses of the jacket each connecting piece engaging arranged sections as rotary stops serve the or each disc spring.
  • the sections of the retaining tabs which act as rotary stops preferably serve in combination with a slot of the disc spring adapted to the groove arrangement enforcing protective device for a control cable or a molded Plug connection of the injection nozzle also the position securing of the injection nozzle relative to the connector. This is advantageous for installation or attachment an assembly unit according to the invention the selected Spray jet position of the injection nozzles ensured.
  • the injectors in groups of adjacent cylinders form an assembly unit connected to a single high-pressure accumulator, wherein the subunits to each other via a compensating connection Compensation for other component, manufacturing and assembly tolerances are connected and the compensating connection is preferably designed as a corrugated pipe.
  • the high-pressure accumulator 7 With injection nozzles detachably held at its connecting piece 5 4 an assembly unit 9, the high-pressure accumulator 7 with the connecting pieces 5 detachable in the assembly direction of the injection nozzles 4 on the machine housing 6 is fixed and which each have a circumferential shoulder 11 against a paragraph 12 a receptacle 13 in the machine housing 6 arranged injectors stop 4 via the fixed high-pressure accumulator 7 by a between the injection nozzles 4 and the connecting piece 5 each arranged to transmit power Spring element 14 are arranged biased.
  • the assembly unit 9 comprises two subunits 9, 9 " with at least two connecting pieces 5 for injectors 4, each of which a cylindrical plug-in extension 15 with radial play in a fuel feed line 16 are arranged in the respective connecting piece 5 with the interposition of a O-ring as an elastic sealing element 8, each plug-in extension 15 also on the injection nozzle side has a groove arrangement 17 for receiving a plate spring 14 as a force-transmitting spring element between the respective connecting piece 5 and respective injection nozzle 4.
  • each connector 5 has one of the injection nozzle side Plug-in extension 15 of the feed line receiving the injection nozzle 16 axially upstream Recess 18 on the arrangement of a plate spring developed with retaining tabs 19 14.
  • the retaining tabs 19 have locking tongues arranged outward 20, which in openings 21 in which the recess 18 delimit Sheath 22 of each connection piece 5 engage positively. How out Figures 2, 3 and 5 can be seen, the retaining tabs 19 with the locking tongues 20 arranged in one piece on the plate springs 14.
  • each injector 4 on the high pressure accumulator 7 or on the assembly unit 9 reaches a double positive connection, namely a first positive connection the plate spring 14 with the groove arrangement 17 of the injection nozzle 14 on the one hand and in openings 21 in the jacket 22 of the connecting piece 5 latching locking tongues 20 of the retaining tabs 19 with the biasing force transferring plate spring 14 are in one piece.
  • the retaining tabs 19 can also on the outer circumference of the jacket 22 with locking tongues engaging in the openings 21 20 may be provided.
  • a first, relatively thick-walled, corresponding to the groove arrangement 17 slotted disc spring 14 as a substantially force-transmitting spring element is provided and that a second, relatively thin-walled, slotted Belleville washer is integrally formed with retaining tabs, with both Belleville washers 14 arranged in the same direction to increase the spring force for increased preload are.
  • a rotation of the plate springs 14 under tension is countered by the fact that the holding tabs 19 each have a step-shaped section 23 with the edge region the plate spring 14 are connected and in the gap recesses 24th of the jacket 22 of each connecting piece 5 engagingly arranged sections 23 serve as turning stops.
  • the injection nozzles 4 form a multi-cylinder gasoline engine 2 of adjacent cylinders in groups with a single high-pressure accumulator 7 each connected the assembly unit 9, the subunits 9, 9 " with each other via a compensating connection 27 to compensate for all possible Tolerances are connected.
  • the compensating connection 27 is preferably as one Corrugated tube 28 designed.
  • the invention provides an embodiment of a high-pressure fuel injection device 1 for a gasoline direct injection found as a tightly tested unit 9 from injection nozzles 4 and high pressure accumulator 7 (common rail) completely on the Internal combustion engine 2 can be assembled at low assembly costs, with the designed from plate spring 14 and retaining tabs 19 with locking tongues 20 Holding and connecting element in combination with the O-ring 8 as an elastic Sealing element of the plug connection of the injection nozzles 4 on the high-pressure accumulator 7 a compensation of all component, manufacturing and assembly tolerances is achieved and at the same time a positional orientation of the injection nozzles 4 is ensured. Since also at disassembly of the assembly unit 9, the injection nozzles 4 on the high-pressure accumulator 7 leakage or loss of fuel is 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)

Claims (9)

  1. Dispositif d'injection de carburant haute pression pour un moteur à combustion interne, notamment un moteur à allumage par étincelle,
    doté d'un injecteur (4) orienté directement dans une chambre à combustion (3) qui
    peut être reliée à un raccord (5) d'un accumulateur de carburant haute pression (7) pouvant être disposé sur le carter du moteur (6) via un câble de jonction avec un élément d'étanchéité élastique (8) compensant les tolérances,
    l'accumulateur haute pression (7) avec le raccord (5) étant fixé sur le carter du moteur (6) tout en pouvant être retiré dans le sens du montage de l'injecteur (4),
    caractérisé en ce que
    l'accumulateur haute pression (7) forme une unité de montage (9, 9', 9") avec un injecteur (4) disposé de manière amovible sur le raccord (5),
    l'injecteur (4) disposé sur une butée dans/sur le carter du moteur (6) est disposé de manière à subir, via l'accumulateur haute pression fixé (7), une précontrainte exercée par un élément de transfert à ressort (14) situé entre l'injecteur (4) et le raccord (5).
  2. Dispositif d'injection selon la revendication 1,
    caractérisé en ce qu'
    une unité de montage (9) ou une unité secondaire (9', 9") comprend au moins deux raccords (5) pour injecteurs (4) qui
    sont chacun disposés dans une conduite d'alimentation de carburant (16) dans le raccord (5) correspondant via un adaptateur cylindrique (15) avec un jeu radial, un joint torique d'étanchéité servant d'élément d'étanchéité élastique (8) étant intercalé et
    chaque adaptateur (15) présentant de plus, du côté de l'injecteur, une structure rainurée (17) permettant d'accueillir un ressort à disque (14) servant d'élément de transfert à ressort entre chaque raccord (5) et chaque injecteur (4).
  3. Dispositif d'injection selon les revendications 1 et 2,
    caractérisé en ce que
    chaque raccord (5) est doté, du côté de l'injecteur, d'un creux (18) précédant sur le plan axial la conduite d'alimentation (16) accueillant l'adaptateur (15) de l'injecteur (4) de manière à pouvoir disposer des colliers de retenue (19) placés sur le ressort à disque (14) qui
    mordent, par complémentarité de forme, des découpes (21) formées dans l'enveloppe (22) de chaque raccord (5) limitant le creux (18) via des languettes de verrouillage (20) orientées vers l'extérieur.
  4. Dispositif d'injection selon la revendication 3,
    caractérisé en ce que
    le ressort à disque (14) et les colliers de retenue (19) sont fabriqués d'un seul tenant avec les languettes de verrouillage (20)
  5. Dispositif d'injection selon les revendications 1 à 4,
    caractérisé en ce qu'
    un premier ressort à disque fendu selon la structure rainurée (17) et à paroi relativement épaisse sert principalement d'élément de transfert à ressort (14) et
    un deuxième ressort à disque (14') également fendu, mais à paroi relativement mince, est fabriqué d'un seul tenant avec les colliers de retenue,
    les deux ressorts à disque étant disposés dans le même sens.
  6. Dispositif d'injection selon les revendications 3 à 5,
    caractérisé en ce que
    les colliers de retenue (19) sont mis en relation avec le bord du ressort à disque (14) via une section en escalier (23) et
    les sections (23) en prise dans les creux de fente (24) de l'enveloppe (22) de chaque raccord (5) servent de butées tournantes du ou des ressorts à disque (14).
  7. Dispositif d'injection selon la revendication 6,
    caractérisé en ce qu'
    en association avec un dispositif de sécurité introduisant la fente (25) adaptée à la structure rainurée (17) des ressorts à disque (14), les sections (23) des colliers de retenue ( 19) agissant comme des butées tournantes sont utilisées avantageusement pour un câble de commande (26) ou une prise de courant embrochable préformée de l'injecteur (4) ainsi que de la sûreté de position de l'injecteur (4) par rapport au raccord (5).
  8. Dispositif d'injection selon au moins l'une des revendications 1 à 7,
    caractérisé en ce que
    pour un moteur (2) à plusieurs cylindres à allumage par étincelle à injection directe, les injecteurs (4) de cylindres voisins alignés en rangée forment une unité de montage (9) en étant reliés par groupe à un seul accumulateur haute pression (7),
    les unités secondaires (9', 9") étant reliées les unes aux autres via un raccord compensateur (27).
  9. Dispositif d'injection selon la revendication 8,
    caractérisé en ce que
    le raccord compensateur (27) a la forme d'un tube ondulé (28).
EP98117925A 1997-11-04 1998-09-22 Dispositif d'injection de combustible à haute pression pour moteurs à combustion interne, notamment pour moteurs Otto Expired - Lifetime EP0915253B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19748593 1997-11-04
DE19748593A DE19748593A1 (de) 1997-11-04 1997-11-04 Hochdruck-Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine, insbesondere Otto-Motor

Publications (3)

Publication Number Publication Date
EP0915253A2 EP0915253A2 (fr) 1999-05-12
EP0915253A3 EP0915253A3 (fr) 2003-01-02
EP0915253B1 true EP0915253B1 (fr) 2003-11-26

Family

ID=7847516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98117925A Expired - Lifetime EP0915253B1 (fr) 1997-11-04 1998-09-22 Dispositif d'injection de combustible à haute pression pour moteurs à combustion interne, notamment pour moteurs Otto

Country Status (3)

Country Link
EP (1) EP0915253B1 (fr)
DE (2) DE19748593A1 (fr)
ES (1) ES2210638T3 (fr)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
US5970953A (en) * 1999-01-12 1999-10-26 Siemens Automotive Corporation High pressure injector clip
US6314943B1 (en) * 1999-10-22 2001-11-13 Ford Global Technologies, Inc. Fuel supply rail with integrated fuel injector load spring
DE10012759A1 (de) * 2000-03-16 2001-09-20 Volkswagen Ag Brennkraftmaschine mit Einspritzventilen
DE10108467A1 (de) * 2001-02-22 2002-09-05 Bosch Gmbh Robert Befestigungsvorrichtung
DE10133264A1 (de) * 2001-07-09 2003-02-06 Bosch Gmbh Robert Befestigungsvorrichtung
DE10236623A1 (de) * 2002-08-09 2004-02-19 Daimlerchrysler Ag Vorrichtung zum Einspritzen von Kraftstoff
DE10256668A1 (de) 2002-12-04 2004-07-29 Robert Bosch Gmbh Stützelement
GB0312406D0 (en) * 2003-05-29 2003-07-02 Delphi Tech Inc Injector assembly
DE102004048401A1 (de) * 2004-10-01 2006-04-06 Robert Bosch Gmbh Niederhalter für eine Brennstoffeinspritzvorrichtung und Brennstoffeinspritzvorrichtung
DE102004055317A1 (de) 2004-11-16 2006-05-24 Bosch Rexroth Aktiengesellschaft Elektrische Drehfeldmaschine und Primärteil
DE102012016254A1 (de) 2012-08-16 2013-03-21 Daimler Ag Rail-Baugruppe
US10167831B2 (en) 2017-01-13 2019-01-01 Caterpillar Inc. Accumulator centering mechanism

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Publication number Priority date Publication date Assignee Title
CA951201A (en) * 1971-09-20 1974-07-16 Bendix Corporation (The) Fuel injector manifold and mounting arrangement
DE2908095C2 (de) * 1979-03-02 1984-02-16 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzanlage für Brennkraftmaschinen
DE7918697U1 (de) * 1979-06-29 1980-08-28 Bayerische Motoren Werke Ag, 8000 Muenchen Verbindung von zwei koaxial hintereinander angeordneten Rohrabschnitten o.dgl
CS220808B1 (en) * 1980-09-19 1983-04-29 Jaromir Indra Head of combustion engine with injector
DE8134504U1 (de) * 1981-11-26 1983-10-06 Bayerische Motoren Werke Ag, 8000 Muenchen Kraftstoff-einspritzanlage fuer brennkraftmaschinen
DE3843214A1 (de) 1988-12-22 1990-06-28 Porsche Ag Kraftstoffleitung
DE4413914A1 (de) * 1994-04-21 1995-10-26 Bosch Gmbh Robert Brennstoffeinspritzeinrichtung
JPH08121285A (ja) * 1994-10-27 1996-05-14 Hitachi Ltd 燃料供給装置及び燃料供給システム
US5697345A (en) * 1994-12-28 1997-12-16 Cummins Engine Company, Inc. Clamping load distributor for a fuel injector
DE19536441A1 (de) * 1995-09-29 1997-04-03 Saab Automobile Federklammer zur Verbindung einer Einspritzdüse mit einer Einspritzleitung
US5762040A (en) * 1997-02-04 1998-06-09 Brunswick Corporation Cylinder wall fuel injection system for loop-scavenged, two-cycle internal combustion engine

Also Published As

Publication number Publication date
DE59810257D1 (de) 2004-01-08
EP0915253A3 (fr) 2003-01-02
ES2210638T3 (es) 2004-07-01
EP0915253A2 (fr) 1999-05-12
DE19748593A1 (de) 1999-05-06

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