EP1431569B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1431569B1
EP1431569B1 EP20030015166 EP03015166A EP1431569B1 EP 1431569 B1 EP1431569 B1 EP 1431569B1 EP 20030015166 EP20030015166 EP 20030015166 EP 03015166 A EP03015166 A EP 03015166A EP 1431569 B1 EP1431569 B1 EP 1431569B1
Authority
EP
European Patent Office
Prior art keywords
actuator
fuel injection
diaphragm
valve needle
valve
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
EP20030015166
Other languages
German (de)
English (en)
Other versions
EP1431569A3 (fr
EP1431569A2 (fr
Inventor
Friedrich Boecking
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 EP1431569A2 publication Critical patent/EP1431569A2/fr
Publication of EP1431569A3 publication Critical patent/EP1431569A3/fr
Application granted granted Critical
Publication of EP1431569B1 publication Critical patent/EP1431569B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating 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
    • F02M61/04—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
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
    • 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 invention relates to a fuel injection valve according to the preamble of claim 1.
  • a fuel injection valve with a piezoelectric or magnetostrictive actuator known, which is in operative connection with a valve needle.
  • the valve needle has at its discharge end a valve closing body which cooperates with a valve seat surface to a sealing seat.
  • the actuator is movably mounted with a first end in a spherical recesses of an upper stop and acts with its movable into a spherical recess second end via a transmission module on the valve needle.
  • the two spherical segment-shaped ends of the actuator mounted in the spherical recesses compensate for centering errors and unevennesses on the surfaces of the ends of the actuator.
  • a disadvantage of the fuel injection valve known from the above publication is in particular the complicated production of the two ball segment-shaped ends formed actuator and the receiving devices of these ends in the fuel injection valve.
  • the spherical segment-shaped ends of the actuator must be processed consuming and strength-reducing or the actuator must have a correspondingly formed holding body in which it is self-supporting. The additional holding body increases the manufacturing and assembly costs.
  • the DE 199 28 916 A1 discloses a fuel injector having a piezoelectric or magnetostrictive actuator disposed in an actuator chamber of a valve housing of the fuel injector, the actuator chamber being sealed by a fuel seal, and having an actuator actuatable valve closure member cooperating with a valve seat surface to form a sealing seat.
  • the seal has a sealing body designed as an actuator pot and a resiliently deformable and band-shaped sealing element which is connected to the sealing body by a first circumferential weld and which is connected to the valve housing by a second circumferential weld seam.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the design effort for storage of the actuator is substantially simplified and reduced.
  • the second end of the actuator can be run and stored dry without sliding friction losses.
  • the installation of the actuator in the fuel injection valve is considerably simplified.
  • the membrane consists of metal, in particular of steel.
  • the elasticity, the flexibility, the temperature resistance and the joining properties can be positively influenced.
  • the membrane is formed in a hole-disc-shaped manner. Thereby it is u. a. possible that the valve needle can reach through the membrane. If the valve needle engages through the membrane, a simple and compact construction of the fuel injection valve is possible in a simple manner.
  • the membrane in half-shell shape in cross section.
  • the guiding property, flexibility and elasticity can be easily adjusted thereby.
  • the membrane has at least one opening. Through the opening also the flexibility and elasticity of the membrane can be influenced. In addition, it is thereby possible to relieve the membrane of pressure loads from adjacent fuel, since the fuel can flow through the at least one opening.
  • the membrane on its inner circumference with the valve needle and on its outer circumference with the housing cohesively, in particular by welding or laser welding to add hermetically sealed.
  • the membrane can thereby also act in particular sealing, for example, to keep fuel from the actuator.
  • this makes it possible to produce particularly strong and easily reproducible joint connections.
  • the membrane is advantageous to form-fit the membrane on its inner circumference with the valve needle and on its outer circumference with the housing.
  • the membrane can be mounted particularly simple and advantageous.
  • the membrane on its inner circumference with the valve needle material fit, in particular by welding or laser welding, and to add on its outer circumference form-fitting manner with the housing.
  • the membrane can thereby be particularly firmly connected to the valve needle and at the same time, for example together with the valve needle, particularly easy to be mounted in the fuel injection valve.
  • the membrane at least partially axially guides the valve needle and thus indirectly guides the second end of the actuator.
  • FIG. 1 An in Fig. 1 in an axial sectional view of the invention shown fuel injector 1 is used in particular for the direct injection of fuel into a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine.
  • a compensation device 5 In a cylindrical housing 2, a compensation device 5, an actuator 4, a valve needle 3, a spring element 6 and a membrane 8 are arranged.
  • the piston-shaped actuator 4 which is preferably constructed of disc-shaped piezoelectric or magnetostrictive elements not shown in more detail, is arranged between the valve needle 3 and the compensation device 5.
  • the compensation device 5 is used to compensate for thermally induced changes in length of the actuator. 4
  • the actuator 4 has a first end 12 and a second end 13, which run parallel to each other.
  • the first end 12 of the actuator 4 rests on the planar side of the compensating device 5 facing it, wherein the opposite, spherical-segment-shaped side of the compensating device 5 engages in a bearing 7 arranged at the end remote from the housing 2.
  • the bearing 7 formed by a spherical recesses, the spherical segment-shaped side of the compensation device 5 can slide.
  • the valve needle 3 is located with its spray-off plan end on the second end 13 and is held by the standing under constant bias spring element 6, which is on the one hand to the balancer 5 and on the other hand to the valve needle 3, in constant contact.
  • the spring element 6 is formed spirally and surrounds the actuator 4 radially.
  • the valve needle 3 passes through the hole-disk-shaped and coaxially arranged membrane 8.
  • the hole-disk-shaped membrane 8 has a half-shell-shaped cross section, that is to say the membrane. h., That the closed course of the membrane 8 is formed throughout half-shell-shaped and thus in the cross section of the membrane 8 show two half-shell-shaped formations.
  • the membrane 8 is made of steel. Due to its flexibility and elasticity, the membrane 8 axially guides the valve needle 3, wherein the actuator 4, which is in frictional connection and positive engagement with the valve needle 3, is also guided thereby.
  • the membrane 8 is materially joined by laser welding by means of a weld 10 on the inner circumference of the valve needle 3 and the outer circumference of the housing 2 hermetically sealed. The membrane 8 thus sealed the actuator 4 of fuel, which flows from the discharge side.
  • an unillustrated valve closing body is formed on the valve needle 3, which is not with a shown valve seat surface cooperates to a sealing seat.
  • a valve seat body not shown, at least one ejection opening, not shown, is formed. The fuel is supplied via a laterally formed in the housing 2 not shown fuel supply and guided to the sealing seat.
  • the piezoelectric actuator 4 supplied via an unillustrated, electronic control unit and a plug contact an electrical excitation voltage, expand the not-shown disc-shaped piezoelectric elements of the actuator 4 against the bias of the spring element 6 and a biasing spring, not shown, and move the valve needle 3 in Abspritzutter, whereby fuel is sprayed in a known manner.
  • Fig. 2 shows a fragmentary schematic representation of the fuel injection valve 1 according to the invention in the region of the membrane 8, similar to the illustration Fig. 1 ,
  • the membrane 8 has a plurality of openings 11 and is connected at the outer periphery by positive engagement with the housing 2.
  • the outer circumference of the membrane 8, which is inclined by the half-shell shape to ejection openings, not shown, is supported on a shoulder 9 from.
  • the shoulder 9 is realized by an inner diameter reduction in the housing 2. In rest position, the outer circumference of the diaphragm 8 presses on the shoulder 9.
  • the positive engagement of the outer periphery of the diaphragm 8 can also be realized by a not shown recesses in the inner periphery of the housing 2 positively in both axial direction sense.
  • the openings 11 are used in particular for pressure relief of the membrane 8, so that the membrane 8, for example, does not release from the form-fitting by the discharge side existing pressurized fuel.
  • the invention may, for. B. also be used for inward-opening fuel injectors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Soupape d'injection de carburant (1), notamment pour l'injection directe de carburant dans une chambre de combustion d'un moteur à combustion interne, comprenant un actionneur piézoélectrique, électrostrictif ou magnétostrictif (4), et une aiguille de soupape (3) en liaison fonctionnelle avec l'actionneur (4), qui présente un corps de fermeture de soupape qui coopère avec une surface de siège de soupape pour créer un ajustement hermétique, l'actionneur (4) étant monté mobile de manière directe ou indirecte avec une première extrémité (12), et l'autre deuxième extrémité (13) agissant sur l'aiguille de soupape (3),
    caractérisée en ce que
    l'aiguille de soupape (3) est guidée axialement dans une membrane élastique et flexible (8) et réalisée en forme de rondelle perforée, l'actionneur (4), qui est en liaison par engagement par force et par correspondance géométrique avec l'aiguille de soupape (3), étant ainsi également guidé, et la membrane (8) présentant au moins une ouverture (11) servant à détendre la pression.
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée en ce que
    la membrane (8) se compose de métal, notamment d'acier.
  3. Soupape d'injection de carburant selon la revendication 1 ou 2,
    caractérisée en ce que
    la membrane (8) est réalisée en forme de demi-coquille en section transversale.
  4. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la membrane (8) est assemblée de manière étanche et hermétiquement sur sa périphérie intérieure avec l'aiguille de soupape (3) et sur sa périphérie extérieure avec un boîtier (2), et ce par engagement par liaison de matière, notamment par soudage ou soudage au laser.
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que la membrane (8) est assemblée par engagement par correspondance géométrique sur sa périphérie intérieure avec l'aiguille de soupape (3) et sur sa périphérie extérieure avec un boîtier (2).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que la membrane (8) est assemblée de manière étanche et hermétiquement sur sa périphérie intérieure avec l'aiguille de soupape (3), notamment par soudage ou soudage au laser, et par engagement par correspondance géométrique sur sa périphérie extérieure avec un boîtier (2).
  7. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la membrane (8) guide l'aiguille de soupape (20) au moins en partie axialement et donc guide de manière indirecte axialement la deuxième extrémité (13) de l'actionneur (4).
EP20030015166 2002-12-19 2003-07-04 Injecteur de carburant Expired - Lifetime EP1431569B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10259800 2002-12-19
DE2002159800 DE10259800A1 (de) 2002-12-19 2002-12-19 Brennstoffeinspritzventil

Publications (3)

Publication Number Publication Date
EP1431569A2 EP1431569A2 (fr) 2004-06-23
EP1431569A3 EP1431569A3 (fr) 2005-11-30
EP1431569B1 true EP1431569B1 (fr) 2009-09-23

Family

ID=32336492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030015166 Expired - Lifetime EP1431569B1 (fr) 2002-12-19 2003-07-04 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1431569B1 (fr)
DE (2) DE10259800A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180063889A (ko) * 2015-10-09 2018-06-12 콘티넨탈 오토모티브 게엠베하 내연 엔진용 유체 분사 장치

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2936425A1 (de) * 1979-09-08 1981-04-02 Robert Bosch Gmbh, 7000 Stuttgart Elektromagnetisch betaetigbares kraftsoffeinspritzventil
DE4005455A1 (de) * 1989-02-28 1990-08-30 Volkswagen Ag Zumessventil, insbesondere kraftstoff-einspritzventil fuer eine brennkraftmaschine
DE19708304C2 (de) 1997-02-28 1999-09-30 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung
DE19928916B4 (de) * 1999-06-24 2017-12-14 Robert Bosch Gmbh Brennstoffeinspritzventil
EP1170500A1 (fr) * 2000-07-03 2002-01-09 Med S.p.A. Soupape d'injection de combustible pour moteurs à combustion interne
DE10046661A1 (de) * 2000-09-20 2002-04-04 Bosch Gmbh Robert Piezoaktor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180063889A (ko) * 2015-10-09 2018-06-12 콘티넨탈 오토모티브 게엠베하 내연 엔진용 유체 분사 장치

Also Published As

Publication number Publication date
DE10259800A1 (de) 2004-07-01
EP1431569A3 (fr) 2005-11-30
DE50311942D1 (de) 2009-11-05
EP1431569A2 (fr) 2004-06-23

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