EP0562276B1 - Injecteur de combustible pour moteur à combustion interne - Google Patents

Injecteur de combustible pour moteur à combustion interne Download PDF

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Publication number
EP0562276B1
EP0562276B1 EP93102581A EP93102581A EP0562276B1 EP 0562276 B1 EP0562276 B1 EP 0562276B1 EP 93102581 A EP93102581 A EP 93102581A EP 93102581 A EP93102581 A EP 93102581A EP 0562276 B1 EP0562276 B1 EP 0562276B1
Authority
EP
European Patent Office
Prior art keywords
wave
nozzle body
fuel injection
injection nozzle
nozzle
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
EP93102581A
Other languages
German (de)
English (en)
Other versions
EP0562276A1 (fr
Inventor
Karl Hofmann
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 EP0562276A1 publication Critical patent/EP0562276A1/fr
Application granted granted Critical
Publication of EP0562276B1 publication Critical patent/EP0562276B1/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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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

Definitions

  • the invention is based on a fuel injector for internal combustion engines according to the preamble of claim 1.
  • the heat shield has the shape of an annular groove or an annular shaft with two wave crests and a wave trough and with edges protruding radially inwards and outwards. This heat shield covers most of the combustion chamber end face of the nozzle body against combustion gases and radiant heat, if it is installed in the design position, namely so that its wave crests lie on the end face of the nozzle body and their troughs rest on the underlying flange.
  • the heat shield tilts when inserted into the clamping nut or its sleeve-shaped attachment, so that the wave crests on the flange and the wave trough come to rest on the face of the nozzle body despite the positionally accurate supply. Since in this "wrong" installation position the uncovered inner circular surface of the face of the nozzle body, which is now determined by the larger diameter of the wave trough that shows up as a wave crest, the heat transfer to the nozzle body is greater than in the "correct" installation position.
  • the nozzle body heats up strongly in highly loaded internal combustion engines, so that the nozzle needle guided in the nozzle body may become jammed and / or the service life of the injection nozzle may be shortened.
  • a collar is arranged in an injection nozzle according to DE-A-38 36 413 in the inner region of the heat shield, which sits in the through opening of the flange of the clamping nut and extends axially from the through opening to the end face of the nozzle body. Due to this design, only a single installation position is possible with this type of heat shield and this must always be observed under assembly during assembly.
  • the fuel injector according to the invention with the features specified in claim 1 has the advantage that even when the heat shield is installed in the wrong position, that is, if the wave crests are valleys and the wave trough is a mountain, the heat shield covers the nozzle body over a large area, so that excessive heat transfer occurs the nozzle body is avoided. A check, especially visual inspection after assembly, for correct installation position of the heat shield can therefore be omitted.
  • the heat shield according to the invention has the advantage that, compared to the heat shield known from DE-A-30 00 061, no larger axial tension forces are required.
  • the heat shield is centered very precisely in the sleeve-shaped extension of the clamping nut.
  • FIG. 1 and 2 show the part of a fuel injection nozzle on the combustion chamber side in enlarged cross section and FIG. 3 shows part of the heat shield of the fuel injection nozzle according to FIG. 1 in greatly enlarged cross section.
  • the injection nozzle has a nozzle body 10, which is fastened together with an intermediate disk 12 by means of a clamping nut 14 to a nozzle holder, not shown in the drawing.
  • the clamping nut 14 is provided with an inner annular shoulder 16 which engages on an outer annular shoulder 18 of the nozzle body 10.
  • the clamping nut 14 also has in the area of the annular shoulder 16 an external thread 20 which engages in a nut thread in an installation bore 22 in the cylinder head 24 of the internal combustion engine.
  • a support shoulder 28 is formed on the outside on a cylindrical extension 26 of the clamping nut 14 which surrounds the nozzle body 10 below the annular shoulder 18 and which, when the injection nozzle is installed, is pressed against a support shoulder 32 in the mounting bore 22 via a sealing ring 30.
  • the injection nozzle shown is a so-called pin nozzle, in which the valve needle opening inwards is provided with a pin 34 which plunges into a nozzle bore which opens out on the combustion chamber side and narrows it down to a narrow annular gap.
  • the nozzle base 36 of the nozzle body 10 must be cooled particularly well in order to keep the coking of the spray annular gap within limits.
  • the clamping nut 14 is in the gap between the end face of the nozzle base 36 and an inwardly directed flange 38 of the extension 26 Heat shield 40 axially clamped under resilient deformation.
  • the heat shield 40 protects an annular portion of the nozzle base 36 from heat radiation and convection by hot combustion gases and dissipates heat to the clamping nut 14, from where the heat passes over a short distance into the cylinder head 24.
  • the heat shield 40 which is shown in FIG. 1 in an ideal installation position and in FIG. 2 in a possible installation position, is punched out of a sheet metal part and has the shape of an annular wave with two wave crests 42, 44 with an intermediate wave trough 46, with two the wave crests 42, 44 with flanks 50, 52 connecting the wave trough 46 and with a radially projecting outer edge region 54.
  • This outer edge region 54 which adjoins the radially outer wave crest 44, is composed of an inclined flank 56 starting from the wave crest 44 and of a flank 56 attached thereto Middle plane of the heat shield 40 adjoining ring 58 together.
  • the outer edge 54 can also fall from the crest 44 slightly inclined into the central plane.
  • the circumference 60 of the heat shield 40 is dimensioned such that the heat shield 40 fits with positioning play in the bore of the extension 26 of the clamping nut 14 near the end of the nozzle body 10 on the combustion chamber side, that is to say is aligned exactly in the center.
  • the inner width 62 of the heat shield 40 is adapted to the opening 64 of the flange 38.
  • the inner wave crest 42 extends toward the opening 64 as a narrow ring 66.
  • the design of the annular shaft of the heat shield 40 is also designed so that the inclination of the radially inner flank 50 has an angle ⁇ to the central axis of less than 40 degrees, preferably 25 degrees.
  • the radially outer flank 52 is flatter, it has an inclination b of 45 degrees to 60 degrees, preferably 50 degrees, so that the angle a + b formed by the two flanks 50, 52 is in the range of 60 degrees to 100 degrees.

Landscapes

  • 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)

Claims (4)

  1. Injecteur de carburant pour des moteurs à combustion interne, comprenant un écrou de serrage (14) qui sert le corps (10) de l'injecteur contre un support d'injecteur, cet écrou ayant un prolongement (26) en forme de manchon qui entoure le corps (10), une bride (38) qui vient prendre sous la face frontale du corps de buse (10) en laissant un intervalle, ainsi qu'une rondelle de protection thermique (40), annulaire, serrée axialement dans l'intervalle compris entre le corps de buse (10) et la bride (38), cette rondelle ayant la forme d'une onde annulaire de matière d'épaisseur constante avec deux sommets d'ondes (42, 44) séparés par un creux d'onde (46), par lesquels la rondelle de protection thermique (40) s'appuie sous tension axiale contre la face frontale du corps d'injecteur (10) ou la face axialement opposée de la bride (38) du prolongement (26), les sommets d'ondes (42, 44) étant reliés au creux (46) par des flancs (50, 52),
    caractérisé en ce que
    les flancs radiaux intérieurs (50) ont une pente inférieure à 40° par rapport à l'axe médian et une zone de bord extérieure (54) adjacente au sommet d'onde (44) radialement extérieure, descend vers le plan médian et son bord limite (60) est adapté avec du jeu de mise en place au diamètre extérieur du prolongement (26) de l'écrou (14).
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le flanc radialement intérieur (50) a une pente de 25° par rapport à l'axe médian.
  3. Injecteur de carburant selon la revendication 1 ou 2,
    caractérisé en ce que
    les flancs (50, 52) qui forment le creux (46) de l'onde ont entre eux un angle (a + b) compris entre 60° et 100° et égal de préférence à 75°.
  4. Injecteur de carburant selon l'une des revendications 1 à 3,
    caractérisé en ce que
    la zone de bord extérieur (54) adjacente au sommet d'onde (44) radialement à l'extérieur, est formée par des flancs (56) inclinés, adjacents au sommet d'onde (44) et un anneau (58) s'étendant radialement.
EP93102581A 1992-03-26 1993-02-19 Injecteur de combustible pour moteur à combustion interne Expired - Lifetime EP0562276B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4209837 1992-03-26
DE4209837A DE4209837A1 (de) 1992-03-26 1992-03-26 Kraftstoffeinspritzdüse für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP0562276A1 EP0562276A1 (fr) 1993-09-29
EP0562276B1 true EP0562276B1 (fr) 1997-05-07

Family

ID=6455072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102581A Expired - Lifetime EP0562276B1 (fr) 1992-03-26 1993-02-19 Injecteur de combustible pour moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP0562276B1 (fr)
JP (1) JP3381958B2 (fr)
DE (2) DE4209837A1 (fr)
ES (1) ES2100381T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3329998B2 (ja) * 1995-10-17 2002-09-30 三菱電機株式会社 筒内噴射用燃料噴射弁
DE102015223605A1 (de) * 2015-11-27 2017-06-01 Robert Bosch Gmbh Injektoranordnung mit Thermoschutzhülse
DE102015225175A1 (de) * 2015-12-15 2017-06-22 Robert Bosch Gmbh Injektor mit verbessertem Wärmeverhalten
GB2552384A (en) * 2016-07-22 2018-01-24 Delphi Int Operations Luxembourg Sarl Nozzle for a fuel injector
JP2022001750A (ja) * 2020-06-22 2022-01-06 株式会社クボタ 副室式ディーゼルエンジン

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3836413A1 (de) * 1988-10-26 1990-05-03 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen

Also Published As

Publication number Publication date
ES2100381T3 (es) 1997-06-16
DE59306363D1 (de) 1997-06-12
JP3381958B2 (ja) 2003-03-04
EP0562276A1 (fr) 1993-09-29
DE4209837A1 (de) 1993-09-30
JPH0626421A (ja) 1994-02-01

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