EP1438500B1 - Vorrichtung zur befestigung eines gerätes zur brechung der akustischen impedanz eines stiftes - Google Patents

Vorrichtung zur befestigung eines gerätes zur brechung der akustischen impedanz eines stiftes Download PDF

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Publication number
EP1438500B1
EP1438500B1 EP02795330A EP02795330A EP1438500B1 EP 1438500 B1 EP1438500 B1 EP 1438500B1 EP 02795330 A EP02795330 A EP 02795330A EP 02795330 A EP02795330 A EP 02795330A EP 1438500 B1 EP1438500 B1 EP 1438500B1
Authority
EP
European Patent Office
Prior art keywords
rod
mass
screws
adjustable stop
assembly
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 - Fee Related
Application number
EP02795330A
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English (en)
French (fr)
Other versions
EP1438500A1 (de
Inventor
Nicolas Delmas
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.)
Renault SAS
Original Assignee
Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1438500A1 publication Critical patent/EP1438500A1/de
Application granted granted Critical
Publication of EP1438500B1 publication Critical patent/EP1438500B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
    • 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
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
    • 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
    • F02M2200/29—Fuel-injection apparatus having rotating 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • 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
    • F02M61/166—Selection of particular materials

Definitions

  • the present invention relates to a device acoustic impedance break in a given area of a rod of a fuel injection device.
  • the present invention relates more particularly a means of assembly between a rod and a mass so as to achieve an impedance break.
  • the said rod being intended to cooperate according to one of its ends with a seat and the other of its ends with the aforementioned mass.
  • the purpose of the present invention makes it possible to perform both a bilateral elastic connection between the stem and the mass aforementioned, a catch-up game of the said rod on its seat by means of elastic reminders and a filter mechanical low pass.
  • Such a device can, for example, be used in an injection device such as that described in patents FR 2801346 and FR 2792369, filed by the Applicant.
  • a device characterized in that a rod or needle deforms elastically under duress of ultrasonic waves so as to define in one of its ends an annular ejection slot with respect to a valve seat, said rod or needle cooperating with its other end with a mass, said cooperating mass with elastic return means housed in a cavity formed in the rear part of the injector housing.
  • connection between the mass and the needle can be then assured in various ways, but we still face in any case the delicate problem of ensuring a liaison bidirectional elastic between the said rod and the mass whatever the operating conditions, any by allowing, when the injector is at rest, a keeping the needle on the seat.
  • the connection between the mass and the needle must be consistent so as not to interfere on the one hand with the assembly of the injection device and secondly, ensure a excellent acoustic impedance break, guaranteeing a better wave reflection in the stem.
  • the present invention aims to perfect the connecting device between the needle shaft of the injection device and the impedance breaking means acoustic by proposing a new architecture of the bond between the needle and a composite mass or not.
  • This link is characterized in that it presents a high robustness, great ease of implementation, and thus allows several successive assemblies of the system with excellent reproducibility, and without this ultimately undermine the quality and reproducibility of link.
  • the fixing device an acoustic impedance breaking means on a rod of a fuel injection device, the rupture impedance being ensured by mounting the rod in a mass comprising elastic return means, the rod being formed in an elastic solid, and on which can propagate a deformation wave of type ultrasound, characterized in that the stem comprises intermediate means of assembly with the mass, the means intermediate assembly ensuring a first connection fixed unilateral between the mass and the rod, the device also includes an adjustable stop cooperating with the mass and the rod so as to form a second bond unilateral adjustable between the rod and the mass, in the opposite to the first fixed unilateral link, the adjustment of the stop being carried out until a contact between the stop and the end of the rod so to form a bilateral link without play between the stem and the mass.
  • the deformation elastic elastic return means makes it possible the assembly of the system constituted by the mass, the needle and the housing of the injection device.
  • the rod has at its end a series obviously cylindrical forming grooves, the grooves being intended to cooperate with a part intermediate thus forming the unidirectional stop.
  • said intermediate piece has at least two separate parts to allow for the establishment of the connection with the fluted end of the needle.
  • the intermediate piece has a shape complementary to the grooves formed on the end of the needle.
  • the intermediate piece has a shape external of revolution, at least partially conical, in order to cooperate with the mass through a cone-cone connection.
  • the first embodiment of the invention shown in Figure 1, essentially comprises four separate organs.
  • the first member is a needle comprising a cylindrical rod 3 formed in a solid elastic, housed axially movable inside a injector housing 5.
  • Shutter means are formed by a first end 26 of the rod 3 and the seat 25, the end 26 cooperating with the seat 25 secured to the injector housing 5.
  • the second end 8 of the rod 3 comprises by example of the grooves on a determined length in order to cooperate, as we will see later with means intermediate assembly 6 and 7.
  • the second organ consists of a mass cylindrical monobloc 20, axially movable, housed in a cavity 21 formed in the injector housing 5, suitable for receive fuel under pressure.
  • This mass is crossed at its center by a first bore 12 which allows the passage of the rod 3.
  • the bore 12 is extended in the upper part of the mass 20 by a second bore 13 of greater diameter. Bores 12 and 13 are separated by a conical shoulder 9, intended for cooperate with intermediate mounting means 6 and 7 which we will describe later.
  • the end of the second bore ends with a partially threaded portion 16, of diameter greater than the bores 12 and 13 so as to to be able to screw inside the threading 16 a stop 17 adjustable to cooperate with the second end 8 of the rod 3.
  • the mass 20 is locked in rotation and guided in translation via two bars cylindrical 2 and 4.
  • the first end 14, 15 of each bar 2, 4 is housed in cylindrical cavities formed in the mass 20 while the second end 22, 23 of 2, 4 is housed in the injector housing 5.
  • the bars 2,4 pass right through a washer 10 connecting the mass 20 to the injector body 5, the bottom of the cavity 21.
  • the elastic washer forms elastic return means.
  • the third organ consisting of the means intermediate 6 and 7 mounting, including for example two separate parts, is intended to cooperate on the one hand with the second end 8 of the rod 3 and secondly with the surfaces formed by the second bore 13 and the shoulder 9 of the mass 20.
  • the intermediate means 6 and 7 form a cylinder, whose inner bore has circular grooves that cooperate with the end 8 of the rod 3 which also has grooves complementary.
  • the outer surface 11 of the cylinder formed by the two parts 6 and 7 assemblies of intermediate means of assembly has a partially conical end in opposite the shoulder 9 to allow centering and locking in translation of the needle 3 when prestressing force required to seal the seat valve 25 is applied to the ground 20 according to the direction 1 through the elastic material 10.
  • the adjustable stop 17 is then screwed to the inside of the threading 16, so as to cooperate with the end 8 of the rod 3.
  • the anti-rotation means 2 and 4 prevent slippage of the mass 20 during the screwing operation of said adjustable stop 17.
  • the assembly formed by the intermediate mounting means 6,7 and the adjustable stop 17 form a bilateral connection between rod 8 and mass 20.
  • This assembly ensures that the splines of the stem 3 and intermediate mounting means 6 and 7 remain always in contact and that even under the solicitation of the deformation wave coming from the rod 3, guaranteeing by therefore an elastic continuity, bidirectional, between the rod 3 and the mass 20.
  • the means of rotational locking are ensured by a cylindrical bar dismountable not shown and whose end is housed in a cylindrical cavity 222 formed inside the injector housing 5.
  • the cylindrical bar is positioned at inside said cylindrical cavity 222 and cooperates with the mass 20 via a bore through 214 formed successively in said mass 20 and in the elastic return means 10, thereby blocking the mass 20 in rotation relative to the housing 5.
  • the blocking in rotation of the mass 20 is carried out temporarily, during assembly, thus allowing the whole mass 20 and rod 3, in normal operation, to be free in rotation compared to the injector housing 5.
  • This freedom of rotation can be advantageous for spreading uniformly the wear of the shutter means formed as we saw it previously by the end 26 of the stem and the seat 25.
  • the mass composite consists of two separate parts 320 and 321.
  • the upper part 320 of the mass cooperates with the same way as before with the means intermediaries 6 and 7 via a at least partially conical contact surface 9 arranged at the end of the mass 20.
  • the adjustable stop 317 is constituted by a cylindrical piece intended to come cooperate with the end 8 of the rod 3.
  • the stop 317 is held in abutment on the end 8 of the rod 3 by via two clamping means 322 and 323, which can be for example a stud and nut assembly, and which ensure the connection between the stop 317 and the part lower 321 of the mass.
  • the clamping means 322 and 323 can be diametrically opposite and go right through upper part 320 of the mass thanks to two bores 324 and 325 shaped inside the mass 320.
  • the means 322 and 323 cooperate with Part 321 lower of the mass 20 via two threads 326 and 327 formed in the lower part 321 of the mass 20 in the extension of the bores 324 and 325.
  • Another advantage of this embodiment lies in in removing the anti-rotation means of both parts 321 and 320 with respect to the housing 5. This deletion is made possible by the adoption of the means 322 and 323 whose symmetrical positioning by relative to the axis of the rod 3 allows an assembly of the adjustable stop 317 without the need to block in rotation by additional means the two parts 320 and 321 of the mass 20.
  • clamping means 322 and 323 between the lower part 321 of the mass and the organ 317 constituting the adjustable stop can be made by via two screws.
  • the mass 320 can be monoblock, in a steel type material for example, and threads 327 and 326 can then be created in an emergent manner or no, directly in the one-piece mass 320.

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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)

Claims (8)

  1. Vorrichtung zur Befestigung eines Mittels zur Brechung der akustischen Impedanz auf einem Schaft (3) einer Vorrichtung zur Einspritzung von Kraftstoff, wobei die Brechung der Impedanz durch die Montage des Schafts (3) in einer Masse (20) sichergestellt wird, welche elastische Rückhaltemittel (10) umfasst, wobei der Schaft (3) aus einem elastischen Festkörper gebildet ist und auf welchem sich eine Verformungswelle vom Ultraschalltyp fortpflanzen kann, dadurch gekennzeichnet, dass der Schaft (3) zwischenliegende Mittel (6, 7) zur Montage mit der Masse (20) aufweist, wobei die zwischenliegenden Mittel (6, 7) eine erste feste einseitige Verbindung zwischen der Masse (20) und dem Schaft (3) sicherstellen, wobei die Vorrichtung gleichfalls ein einstellbares Widerlager (17) umfasst, das mit der Masse (20) und dem Schaft (3) zusammenwirkt, um eine zweite einstellbare einseitige Verbindung zwischen dem Schaft (3) und der Masse (20) zu bilden, in einer der ersten festen einseitigen Verbindung entgegengesetzten Richtung, wobei die Einstellung des Widerlagers (17) bis zum Erhalt eines Kontakts zwischen dem Widerlager (17) und dem Ende (8) des Schafts (3) bewirkt wird, um eine zweiseitige Verbindung ohne Spiel zwischen dem Schaft (3) und der Masse (20) zu bilden.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die zwischenliegenden Montagemittel aus mindestens zwei symmetrischen Teilen (6, 7) bestehen, wobei diese beiden Teile einen kompakten Block bilden, der dazu bestimmt ist, mit dem Schaft (3) über eine oder mehrere zylindrische Aussparungen zusammenzuwirken, die jeweils auf dem Ende (8) des Schafts (3) und den symmetrischen Teilen (6, 7) ausgebildet sind.
  3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die äußere Form der zwischenliegenden Mittel (6, 7) zur Montage eine äußere Geometrie eines Rotationskörpers aufweist, zumindest teilweise konisch, um mit der Masse (20) über den Umweg einer Verbindung Konus-auf-Konus zusammenzuwirken.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Masse (20) aus einem Einheitsblock ist und aus einem dichten Material vom Typ Stahl gebildet wird.
  5. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Masse eine Verbundmasse ist und zwei unterschiedliche Teile (320) und (321) aufweist, die jeweils aus einem dichten Material vom Typ Wolfram und vom Typ Stahl gebildet werden.
  6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das einstellbare Widerlager (17) mittels einer Schraube verwirklicht wird, welche mit der Masse (20) über ein Gewinde (16) zusammenwirkt, wobei die Achse des Gewindes (16) mit derjenigen des Schafts (3) zusammenfällt.
  7. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das einstellbare Widerlager (17) ein Stück (317) aufweist, welches durch zwei oder mehrere Schrauben durchdrungen wird, die symmetrisch im Verhältnis zur Achse des Schafts (3) angeordnet sind, wobei die Schrauben jeweils mit einem Gewinde zusammenwirken, das in der Masse (20) verwirklicht ist, wobei die Schrauben den Halt in Auflage des einstellbaren Widerlagers (317) auf dem Ende des Schafts (3) sicherstellen.
  8. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das einstellbare Widerlager (17) ein Stück (17) aufweist, welches durch mindestens zwei Schrauben (322 und 323) durchdrungen wird, die symmetrisch im Verhältnis zur Achse des Schafts (3) angeordnet sind, wobei die Schrauben den oberen Teil der Masse (320) durchdringen, im Inneren von welcher durchgehende Bohrungen (325) ausgebildet sind, wobei die Schrauben (322) und (323) mit Gewinden (327) zusammenwirken, welche in dem unteren Teil der Masse (321) ausgebildet sind, wodurch der Halt in Auflage des einstellbaren Widerlagers (317) auf dem Ende des Schafts (3) sichergestellt wird.
EP02795330A 2001-10-25 2002-10-18 Vorrichtung zur befestigung eines gerätes zur brechung der akustischen impedanz eines stiftes Expired - Fee Related EP1438500B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0113791 2001-10-25
FR0113791A FR2831613B1 (fr) 2001-10-25 2001-10-25 Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige d'un dispositif d'injection de carburant
PCT/FR2002/003576 WO2003036077A1 (fr) 2001-10-25 2002-10-18 Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige

Publications (2)

Publication Number Publication Date
EP1438500A1 EP1438500A1 (de) 2004-07-21
EP1438500B1 true EP1438500B1 (de) 2005-04-13

Family

ID=8868702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02795330A Expired - Fee Related EP1438500B1 (de) 2001-10-25 2002-10-18 Vorrichtung zur befestigung eines gerätes zur brechung der akustischen impedanz eines stiftes

Country Status (5)

Country Link
EP (1) EP1438500B1 (de)
DE (1) DE60203727T2 (de)
ES (1) ES2236613T3 (de)
FR (1) FR2831613B1 (de)
WO (1) WO2003036077A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2904666B1 (fr) * 2006-08-02 2011-03-04 Renault Sas Dispositif d'injection de carburant a ondes acoustiques comportant des moyens de rupture d'impedance acoustique de la tige d'ejection.
FR2906848B1 (fr) * 2006-10-09 2012-04-20 Renault Sas Dispositif de maintien d'une aiguille d'un injecteur de carburant, et injecteur de carburant associe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2792369B1 (fr) 1999-04-15 2001-05-11 Renault Dispositif d'injection de carburant pour moteur a combustion interne
FR2801346B1 (fr) 1999-11-19 2002-10-31 Renault Dispositif d'injection de carburant pour moteur a combustion interne
FR2816097B1 (fr) * 2000-10-27 2003-02-07 Renault Dispositif de rupture d'impedance acoustique d'une tige

Also Published As

Publication number Publication date
ES2236613T3 (es) 2005-07-16
EP1438500A1 (de) 2004-07-21
FR2831613A1 (fr) 2003-05-02
DE60203727D1 (de) 2005-05-19
WO2003036077A1 (fr) 2003-05-01
FR2831613B1 (fr) 2004-01-23
DE60203727T2 (de) 2006-02-09

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