EP0485545B1 - Dispositif d'injection de carburant pour moteurs a combustion interne - Google Patents

Dispositif d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP0485545B1
EP0485545B1 EP91908413A EP91908413A EP0485545B1 EP 0485545 B1 EP0485545 B1 EP 0485545B1 EP 91908413 A EP91908413 A EP 91908413A EP 91908413 A EP91908413 A EP 91908413A EP 0485545 B1 EP0485545 B1 EP 0485545B1
Authority
EP
European Patent Office
Prior art keywords
connection piece
fuel injection
spring
locking elements
opening
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
EP91908413A
Other languages
German (de)
English (en)
Other versions
EP0485545A1 (fr
Inventor
Helmut Bassler
Thomas Naeger
Jochen Friedmann
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0485545A1 publication Critical patent/EP0485545A1/fr
Application granted granted Critical
Publication of EP0485545B1 publication Critical patent/EP0485545B1/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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M61/145—Arrangements of injectors with respect to engines; Mounting of injectors the injection nozzle opening into the air intake conduit
    • 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
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa

Definitions

  • the invention is based on a fuel injection device for internal combustion engines of the type defined in the preamble of claim 1.
  • the connecting member is designed as a U-shaped spring clip, the web of which extends transversely to the longitudinal extent of the fuel injector and the legs of which, on the one hand, with rags bent radially inwards into a circumferential groove on the valve housing of the Intervene fuel injector and on the other hand have openings in which a circumferential locking collar on the connecting piece can be snapped.
  • the tabs For the radial fixation of the spring clip in the circumferential groove of the valve housing, the tabs have a circular arc and concave sections, the radius of which corresponds to that of the circumferential groove.
  • the spring clip is first pushed onto the fuel injector, the legs engaging with their tabs in the circumferential groove. Then the fuel injector provided with the spring clip is inserted axially into the connecting piece. So that the legs can slide over the locking collar, they are in the direction of insertion angled on the outside and spread out by the locking collar when inserted. As soon as the locking collar has snapped into the openings, the legs spring back into their starting position.
  • the fuel injection device according to the invention with the characterizing features of claim 1 has the advantage that in simple and inexpensive way the fuel injectors used in the connecting piece and held by means of the connecting links are installed in the circumferential direction with exact tolerance and function and a twisting by simple force from the outside, e.g. B. by plugging or unplugging the connection cable is no longer possible.
  • the connecting links are easy to manufacture and enable easy and automatic assembly.
  • the molded elements on the fuel injection valves can already be taken into account in the molding tool and do not lead to significant additional costs in production.
  • the correct positioning of the fuel injection valves with regard to the intake geometry of the internal combustion engine can be reproduced with high precision even after disassembly for service purposes and is reliably maintained even under rough operating conditions.
  • FIG. 1 shows a detail of a side view of a fuel injection device, partly in section
  • FIG. 2 shows a view of the fuel injection device in the direction of arrow II in FIG. 1
  • FIG. 3 shows a bottom view of the fuel injection device in FIG. 1 with the fuel injection valve removed
  • FIG. 4 shows a front view of a connecting link in the fuel injection device according to FIG 1 to 3
  • FIG. 5 shows a side view of the connecting link in FIG. 4
  • FIG. 6 shows a top view of the connecting link in FIG. 4.
  • the fuel injection device for internal combustion engines shown in FIGS. 1 and 2 in two different side views, partly in section and in sections, has a fuel distributor 10 made of plastic or e.g. B. aluminum, which carries a plurality of connecting pieces 11 and an equal number of fuel injectors 12 with an existing at one end port opening for fuel supply.
  • Such fuel injection valves 12 are generally called top-feed valves.
  • the number of connecting pieces 11 on the fuel distributor 10 and the number of fuel injection valves 12 may correspond to or be less than the number of cylinders to be supplied to the internal combustion engine. In a four-cylinder internal combustion engine, four fuel injection valves 12 are thus to be provided, which are each used in a liquid-tight manner in one of four connecting pieces 11 on the fuel distributor 10.
  • each connecting piece 11 is provided at the free end with two radially projecting locking elements 13, 30 and each fuel injector 12 with a circumferential groove 14 in its valve housing 15, and a connecting member 16 is provided for each fuel injector 12, which on the one hand fits into the circumferential groove 14 engages and on the other hand overlaps the locking elements 13, 30.
  • FIGS. 4 to 6 An embodiment of such a connecting member 16 is shown in Figures 4 to 6. It is formed by an approximately U-shaped spring clip 17, which is made from a stamped sheet metal part or is designed as a plastic injection-molded part.
  • the spring clip 17 has two spring legs 18, 19 and a spring bar 20 connecting them.
  • Spring legs 18, 19 and spring bar 20 each extend approximately parallel to in the functional position of the spring clip 17 Center line 41 of connecting piece 11 and fuel injector 12. From each spring leg 18, 19 an inwardly directed tab 21 or 22 protrudes approximately at right angles, which engages with a contour 23 or 24 adapted to the circumferential groove 14 in the valve housing 15.
  • the spring legs 18, 19 each have a longitudinally extending rectangular opening 25 and 26, the width of which is dimensioned in the direction of the center line 41 such that each locking element 13, 30 on the connecting piece 11 is able to pass through the openings 25, 26 and is thus overlapped on both sides by the spring legs 18, 19.
  • the spring legs 18, 19 are angled obliquely outwards in their longitudinal edge region 43, 44 facing the connecting piece 11, so that they can be pushed onto the connecting piece easily, preferably mechanically.
  • Two sheet metal segments 27, 28 extend approximately parallel to the center line 41 from the spring bar 20.
  • the sheet metal segments 27, 28 form a fixing element in the form of a central longitudinal slot 29, which is open towards the free end of the sheet metal segments 27, 28 facing away from the spring bar 20.
  • the rectangular sheet metal segments 27, 28 directed toward the fuel injection valve 12 are bent inward in the end region facing away from the spring web 20.
  • a shaped element in the form of a radially projecting cam, web or rib 32 is arranged on the outside of the valve housing 15 of each fuel injection valve 12.
  • the spring clip 17 locks the fuel injector 12 on the connecting piece 11 both in the axial direction and in the circumferential direction, so that it is neither pulled off in the axial direction nor twisted in the circumferential direction without external force can be.
  • the cams 32 are attached at a defined position, so that the fuel injection valve 12, which is designed as a multi-jet valve, is positioned exactly in relation to the intake geometry in the internal combustion engine with respect to its jet planes after being locked on the connecting piece 11.
  • the two locking elements 13, 30 extend at a distance from one another on the circumference of the connecting piece 11 and extend only over part of this circumference.
  • the locking elements 13, 30 are mirror images and are arranged essentially symmetrically to a plane of symmetry 47 which runs through the center line 41 and perpendicular to a longitudinal axis 48 of the fuel distributor 10.
  • Each locking element 13, 30 has a rectangular cross section with longitudinal sides 50 extending in the circumferential direction of the connecting piece 11 and narrow sides 51 running perpendicularly to it.
  • at least one narrow side 51 of each locking element 13, 30 is designed so that it Connection piece 11 facing away from sharp edges protrudes from the respective rectangular opening 25, 26 of the spring clip 17.
  • the narrow sides 51 of the locking elements 13, 30 protruding from the respective opening 25, 26 lie symmetrically to the plane of symmetry 47, that is to say on the same side of the longitudinal axis 48.
  • Each locking element 13, 30 has an end face 52 which, starting from the opening 25 , 26 protruding narrow side 51 initially parallel and then inclined to the plane of symmetry 47 to the other narrow side 51.
  • the spring clip 17 is not widened too much during assembly.
  • Each opening 25, 26 completely surrounds one of the locking elements 13, 30.
  • Each of the locking elements 13, 30 can of course also have a suitable other cross section, such as. B. oval, diamond-shaped, triangular or the like, in which case the openings 25, 26 of the spring clip 17 are adapted in a corresponding manner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

Un dispositif d'injection de carburant pour moteurs à combustion interne présente un distributeur de carburant (10) comportant une pluralité d'ajutages (11) munis d'éléments de verrouillage (13, 30) en saillie radialement, et une pluralité de soupapes d'injection de carburant (12) réalisées sous la forme de soupapes dites 'top-feed' ou d'alimentation de tête qui sont insérées hermétiquement dans les ajutages (11). Pour la fixation des soupapes d'injection (12) en direction axiale et pour empêcher toute rotation de celles-ci dans le sens périphérique, il est prévu pour chacune d'elles un élément de raccordement (16) venant se loger dans une rainure périphérique (14) de la cage (15) de la soupape et recouvrant les éléments de verrouillage (13, 30). De plus, l'élément de raccordement (16) présente un élément de fixation (29) venant en prise, tout en assurant une liaison solidarisée, au moins en direction périphérique, avec un élément profilé (32) disposé en un emplacement déterminé sur la cage (15) de la soupape.

Claims (9)

  1. Dispositif d'injection de carburant pour moteurs à combustion interne, comportant :
    - un distributeur de carburant (10) équipé d'un certain nombre de tubulures de raccordement (11) portant des éléments de verrouillage (13, 30) dépassant radialement,
    - un certain nombre d'injecteurs de carburant (12) montés chacun de manière étanche, par une extrémité frontale portant un orifice de raccordement, dans une tubulure (11),
    - un organe de liaison (16) qui, pour maintenir l'injecteur (12) sur la tubulure (11), est en prise d'une part dans une rainure périphérique (14) du boîtier d'injecteur (15) et d'autre part avec l'élément de verrouillage (13, 30) à travers deux ouvertures (25, 26),
    dispositif caractérisé en ce que :
    - pour garantir la position imposée à l'injecteur (12) lors de son montage sur la tubulure (11), on place sur le boîtier (15) un élément de forme (32), dans une position définie, l'élément de liaison (16) portant un élément de fixation (29) venant en prise avec l'élément de forme (32),
    - chaque tubulure de raccordement (11) porte, séparés l'un de l'autre mais sensiblement symétriques par rapport à un plan de symétrie (47) passant par la ligne médiane (41) de la tubulure de raccordement (11), deux éléments de verrouillage (13, 30) occupant chacun une partie seulement de la périphérie de la tubulure (11), en étant entouré par une des ouvertures (25, 26) et présentant une forme empêchant sa rotation dans l'ouverture (25, 26).
  2. Dispositif selon la revendication 1, caractérisé en ce que chaque élément de verrouillage (13, 30) a une section rectangulaire dont les côtés longs (50) sont orientés selon la direction périphérique de la tubulure (11) et les côtés étroits (51) perpendiculairement à celle-ci, chacun des éléments (13, 30), par au moins l'un de ses côtés étroits (51), dépassant de l'ouverture (25, 26) en s'écartant de la tubulure de raccordement (11).
  3. Dispositif selon la revendication 2, caractérisé en ce que les côtés étroits (51) des éléments (13, 30), dépassant de l'ouverture (25, 26), sont symétriques par rapport au plan de symétrie (47).
  4. Dispositif selon la revendication 3, caractérisé en ce que chaque élément de verrouillage (13, 30) a une face frontale (52) qui, partant du côté (51) dépassant de l'ouverture (25, 26), est d'abord parallèle, puis oblique par rapport au plan de symétrie (47), jusqu'à l'autre côté étroit (51).
  5. Dispositif selon la revendication 2, caractérisé en ce que l'ouverture (25, 26) a une forme rectangulaire.
  6. Dispositif selon la revendication 1, caractérisé en ce que l'élément de forme porté par le boîtier d'injecteur (15) est constitué par une dent, une barrette ou une nervure (32) disposée sensiblement selon la direction axiale et radialement en relief par rapport au boîtier, tandis que l'élément de fixation porté par l'organe de liaison (16) est constitué par une fente (29) ouverte vers l'intérieur partant d'une face frontale de l'organe de liaison (16).
  7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que l'organe de liaison (16) est une pince élastique (17) en forme de U, comportant deux branches (18, 19) reliées par une traverse (20) sensiblement parallèle à la ligne médiane (41) du boîtier (15) et de l'injecteur (12), une languette (21, 22) partant de chaque branche (18, 19), perpendiculairement vers l'intérieur, et venant en prise dans la rainure périphérique (14) du boîtier (15) par son bord (23, 24) de forme adaptée à celle de cette rainure, tandis que les branches élastiques (18, 19) présentent chacune une ouverture (25, 26) d'où dépasse un élément de verrouillage (13, 30) porté par la tubulure de raccordement (11), l'élément de fixation (29) situé sensiblement au milieu de la traverse (20) étant orienté transversalement à celle-ci.
  8. Dispositif selon la revendication 7, caractérisé en ce que les branches élastiques (18, 19) ont leurs bords longitudinaux, situés du côté de la tubulure (11), qui sont inclinés vers l'extérieur.
  9. Dispositif selon la revendication 7 ou 9, caractérisé en ce que la pièce élastique (17) est réalisée en tôle découpée ou en matière plastique moulée par injection.
EP91908413A 1990-06-02 1991-04-25 Dispositif d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP0485545B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4017875A DE4017875C2 (de) 1990-06-02 1990-06-02 Brennstoffeinspritzeinrichtung für Brennkraftmaschinen
DE4017875 1990-06-02
PCT/DE1991/000343 WO1991019091A1 (fr) 1990-06-02 1991-04-25 Dispositif d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP0485545A1 EP0485545A1 (fr) 1992-05-20
EP0485545B1 true EP0485545B1 (fr) 1995-07-12

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ID=6407747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91908413A Expired - Lifetime EP0485545B1 (fr) 1990-06-02 1991-04-25 Dispositif d'injection de carburant pour moteurs a combustion interne

Country Status (10)

Country Link
US (1) US5167213A (fr)
EP (1) EP0485545B1 (fr)
JP (1) JP3251284B2 (fr)
KR (1) KR0185733B1 (fr)
AU (1) AU629478B2 (fr)
BR (1) BR9105777A (fr)
DE (2) DE4017875C2 (fr)
ES (1) ES2075446T3 (fr)
RU (1) RU2066393C1 (fr)
WO (1) WO1991019091A1 (fr)

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AU629478B2 (en) 1992-10-01
EP0485545A1 (fr) 1992-05-20
DE4017875C2 (de) 1999-02-04
RU2066393C1 (ru) 1996-09-10
US5167213A (en) 1992-12-01
DE4017875A1 (de) 1991-12-05
JP3251284B2 (ja) 2002-01-28
KR0185733B1 (ko) 1999-03-20
JPH05500258A (ja) 1993-01-21
ES2075446T3 (es) 1995-10-01
DE59105977D1 (de) 1995-08-17
AU7746191A (en) 1991-12-31
WO1991019091A1 (fr) 1991-12-12
KR927002465A (ko) 1992-09-04
BR9105777A (pt) 1992-06-02

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