EP0312708B1 - Soupape d'injection électromagnétique pour moteurs à combustion interne et méthode de sa production - Google Patents

Soupape d'injection électromagnétique pour moteurs à combustion interne et méthode de sa production Download PDF

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Publication number
EP0312708B1
EP0312708B1 EP88111303A EP88111303A EP0312708B1 EP 0312708 B1 EP0312708 B1 EP 0312708B1 EP 88111303 A EP88111303 A EP 88111303A EP 88111303 A EP88111303 A EP 88111303A EP 0312708 B1 EP0312708 B1 EP 0312708B1
Authority
EP
European Patent Office
Prior art keywords
valve
round rod
spring
section
closing body
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
EP88111303A
Other languages
German (de)
English (en)
Other versions
EP0312708A1 (fr
Inventor
Walter Schauer
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.)
Pierburg GmbH
Original Assignee
Pierburg 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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP0312708A1 publication Critical patent/EP0312708A1/fr
Application granted granted Critical
Publication of EP0312708B1 publication Critical patent/EP0312708B1/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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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

Definitions

  • the invention relates to an electromagnetic injection valve for internal combustion engines according to the preamble of patent claim 1 and a method for its production according to the preamble of patent claim 3.
  • an element is axially displaced within a tube arranged centrally in the valve, whereby the preload of the spring loading the valve closing body is to be adjusted.
  • the named element is secured in different ways. If the tube is at the same time the magnetic core, at the free end of which the magnet armature strikes, there is a risk that the armature will tilt after a long period of operation if it has worked something into the tube due to asymmetrical impact. The valve then no longer measures precisely and is no longer leakproof.
  • JP-A-5815758 discloses an electromagnetic injection valve for internal combustion engines, the fuel outlet of which is controlled by a valve closing body which is loaded by a spring onto a valve seat and acts as an armature under the force of an excited magnetic field generated by an electrical coil and an iron circuit in an iron-free gap and lifts off the valve seat, the iron core protruding into the coil being designed as a round rod and fixed with a section, but adjustable in the longitudinal direction, clamped in the valve housing and, after adjustment, fixed to the valve housing by laser welding.
  • this adjustment does not allow adjustment in the fuel throughput.
  • the object of the invention is therefore to design an injection valve of the type mentioned in such a way that, in the method for its production, the setting processes of spring force and stroke which are decisive for the function of the valve can be carried out simply and precisely and can be permanently secured.
  • the claim 3 relates to a method for its production.
  • the advantage that can be achieved with the invention is, in particular, that very simple adjustment methods of the highest accuracy can be achieved at a low cost by a change in length formed by deformation for adjusting the stroke with subsequent adjustment of the spring force via a clamping ring.
  • a valve upper part 1 is made of magnetizable soft iron as an extruded part or the like and in connection with a round rod 2 made of magnetizable material with the function of an adjusting pin and a valve housing 3.
  • An electrical coil 4 is inserted in the annular space remaining between round rod 2 and valve housing 3. which is excitable via leads, not shown.
  • the fuel flows from a supply line 5 around the coil to the fuel return 6 and in this way cools the coil.
  • the fuel is in contact with a valve seat 8 in the region of a valve seat body 7 fastened to the valve housing 3 in accordance with its delivery pressure.
  • On the round rod 2 there is a clamping ring 9 (shown in FIG. 2) which cooperates with a spring 10 which loads a valve closing body 11 in the direction of the valve seat 8.
  • the stroke of the valve closing body 11, which acts as an armature, is located between the end face of the round rod 2 and the spherical end face of the valve closing body 11, which can be designed as a round rod, but also as a plate, ball or hemisphere.
  • the preassembled fuel injector is adjusted in several steps:
  • the centrally arranged round rod 2 is, when the coil is energized (tightened valve closing member 11), by a tool around a specified setpoint, e.g. approx. 0.03-0.08 mm, axially displaced towards valve seat 8 and in this position with neck 12 of valve upper part 1 by e.g. Laser welding connected.
  • the coarse adjustment can also be achieved by pressing, if the affected parts are designed accordingly, whereby laser welding is not required. It is also conceivable to specify a flow value as a reference variable for the axial displacement.
  • the length of the rod 2 is changed by means of an embossing device 15 by the radial force acting on it.
  • the embossing process is carried out depending on the flow of a test medium under pressure (air, fuel or other medium) and taking into account the springback of the deformed material. It is important that the embossing is carried out at a constant speed and that after the setpoint has been reached, the embossing dies are immediately pulled out of the embossing marks 16 in order to avoid further flow of the material and thus a further undesired change in length.
  • the embossing dies are advantageously cylindrical in a certain diameter and with a small lift-off bevel in order to achieve a desired constant, finely metered change in length, in this case in a ratio of approx. 10: 1 on the other hand to avoid jamming when the dies are withdrawn from the deformed material.
  • a stroke adjustment method an adjustment accuracy of ⁇ 0.001 mm can be achieved.
  • the spring force of the spring 10 is adjusted during dynamic operation of the valve, i.e. This is clocked with a fixed frequency and opening time, with fuel under operating pressure.
  • the clamping ring 9 arranged on the round rod 2 is axially displaced by means of a tool 17.
  • the tool 17 is equipped with two punches which engage through two opposing return bores 6 in the valve upper part 1 in recesses 18, 19 of the clamping ring 9, the one punch first pushing the clamping ring 9 apart and thus releasing the clamping connection. Both stamps raise or lower the loosened clamping ring 9, whereby the spring 10 is more or less tensioned.
  • the position in which the defined fuel throughput is measured is fixed by tensioning the clamping ring 9 on the round rod 2, supported by both arms of the device 17.
  • One arm of the device 17 moves out of the recess 18 of the clamping ring 9 until the clamping connection between the clamping ring 9 and the round rod 2 is restored.
  • a further advantage is that the change in the stroke due to springing back of the material deformed transversely to the longitudinal direction can only occur in a ratio of approximately 1:10 in the event of aging. An associated change in throughput remains within narrow tolerances.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (3)

1. Soupape d'injection électromagnétique pour moteurs à combustion interne, dont la sortie de combustible est contrôlée par un corps de fermeture de soupape (11), chargé par un ressort sur un siège de soupape (8), ce corps faisant office d'induit sous l'effet d'un champ magnétique excité, produit dans un entrefer au moyen d'une bobine électrique (4) et d'un circuit magnétique, et se soulevant du siège de soupape (8), le noyau de fer, qui pénètre dans la bobine (4), étant réalisé sous forme de barre ronde (2), étant fixé par une section dans une partie supérieure de la cage de soupape (1), et formant une butée pour le corps de fermeture de soupape, sur la section non fixée, caractérisée en ce que la section non fixée de la barre ronde (2) présente, à la transversale du sens longitudinal, deux empreintes (16) au moins orientées en direction du centre de la barre, des ouvertures (13, 14) étant disposées dans la zone des empreintes (16), sur la partie supérieure de la soupape (1), pour l'introduction des outils d'estampage (15).
2. Soupape d'injection suivant la revendication 1, caractérisée en ce que la section non fixée de la barre ronde (2) présente une butée à ressort, réalisée sous forme de bague de serrage (9), qui peut se déplacer au travers d'ouvertures de la cage de soupape (6), dans le sens longitudinal de la barre ronde.
3. Méthode de production d'une soupape d'injection électromagnétique pour moteurs à combustion interne, dont la sortie de combustible est contrôlée par un corps de fermeture de soupape, chargé par un ressort sur un siège de soupape, ce corps faisant office d'induit sous l'effet d'un champ magnétique excité, produit dans un entrefer au moyen d'une bobine électrique et d'un circuit magnétique, et se soulevant du siège de soupape, le noyau de fer, qui pénètre dans la bobine, réalisé sous forme de barre ronde, formant une butée pour le corps de fermeture de soupape, et présentant une butée à ressort, suivant les revendications 1 et 2, ce noyau étant soumis dans une première étape, en qualité de réglage grossier de la course de soupape, à un déplacement axial en direction du siège de soupape, au moyen d'un outil, étant fixé dans une deuxième étape dans la cage de soupape, dans cette position, par sa première section, caractérisée en ce qu'un réglage fin de la course de soupape est obtenu dans une troisième étape, par une déformation linéaire permanente de la section non fixée de la barre ronde (2), sous l'effet d'outils d'estampage (15), qui s'engagent dans les empreintes (16), et en ce qu'un réglage de la force du ressort (10), qui sollicite le corps de fermeture de soupape (11), d'un côté, est assuré dans une quatrième étape, par le déplacement axial, suivi du serrage, d'une butée (9), disposée sur la section non fixée de la barre ronde (2), et sur laquelle s'appuie le ressort (10), de l'autre côté.
EP88111303A 1987-10-17 1988-07-14 Soupape d'injection électromagnétique pour moteurs à combustion interne et méthode de sa production Expired - Lifetime EP0312708B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873735288 DE3735288A1 (de) 1987-10-17 1987-10-17 Elektromagnetisches einspritzventil fuer brennkraftmaschinen
DE3735288 1987-10-17

Publications (2)

Publication Number Publication Date
EP0312708A1 EP0312708A1 (fr) 1989-04-26
EP0312708B1 true EP0312708B1 (fr) 1991-07-03

Family

ID=6338604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111303A Expired - Lifetime EP0312708B1 (fr) 1987-10-17 1988-07-14 Soupape d'injection électromagnétique pour moteurs à combustion interne et méthode de sa production

Country Status (3)

Country Link
EP (1) EP0312708B1 (fr)
DE (2) DE3735288A1 (fr)
ES (1) ES2023985B3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1240180B (it) * 1990-04-06 1993-11-27 Weber Srl Valvola dosatrice e polverizzatrice di carburante ad azionamento elettromagnetico per un dispositivo di alimentazione di un motore endotermico
IT227621Y1 (it) * 1992-08-07 1997-12-15 Weber Srl Perfezionamento alle valvole dosatrici e polverizzatrici di carburante ad azionamento elettromagnetico.
JP3795724B2 (ja) * 2000-03-13 2006-07-12 株式会社デンソー 燃料噴射装置及びその噴射特性調整方法
DE10130239A1 (de) * 2001-06-22 2003-01-02 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zu dessen Einstellung
EP1445477B1 (fr) * 2003-01-24 2006-04-05 Siemens VDO Automotive S.p.A. Dispositif de dosage avec calibreur du débit et procédé pour ajuster le débit du dispositif de dosage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431677A1 (de) * 1984-08-29 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares kraftstoffeinspritzventil

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731881A (en) * 1972-02-24 1973-05-08 Bowmar Instrument Corp Solenoid valve with nozzle
US4384681A (en) * 1978-11-01 1983-05-24 The Bendix Corporation Electromagnetic fuel injector
US4346847A (en) * 1980-07-21 1982-08-31 General Motors Corporation Electromagnetic fuel injector with adjustable armature spring
DE3031564A1 (de) * 1980-08-21 1982-04-08 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisches kraftstoffeinspritzventil und verfahren zur herstellung eines elektromagnetischen kraftstoffeinspritzventiles
DE3623554A1 (de) * 1986-07-12 1988-01-21 Pierburg Gmbh Elektromagnetisches, intermittierendes einspritzventil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431677A1 (de) * 1984-08-29 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares kraftstoffeinspritzventil

Also Published As

Publication number Publication date
ES2023985B3 (es) 1992-02-16
DE3863526D1 (de) 1991-08-08
DE3735288A1 (de) 1989-04-27
EP0312708A1 (fr) 1989-04-26

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