EP1431568B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1431568B1
EP1431568B1 EP20030015164 EP03015164A EP1431568B1 EP 1431568 B1 EP1431568 B1 EP 1431568B1 EP 20030015164 EP20030015164 EP 20030015164 EP 03015164 A EP03015164 A EP 03015164A EP 1431568 B1 EP1431568 B1 EP 1431568B1
Authority
EP
European Patent Office
Prior art keywords
actuator
fuel injection
injection valve
actuator housing
heat
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
EP20030015164
Other languages
German (de)
English (en)
Other versions
EP1431568A2 (fr
EP1431568A3 (fr
Inventor
Uwe Liskow
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 EP1431568A2 publication Critical patent/EP1431568A2/fr
Publication of EP1431568A3 publication Critical patent/EP1431568A3/fr
Application granted granted Critical
Publication of EP1431568B1 publication Critical patent/EP1431568B1/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
    • F02M61/04—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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0057—Means for avoiding fuel contact with valve actuator, e.g. isolating actuators by using bellows or diaphragms

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve with a piezoelectric actuator which is connected via a confirmation strand in operative connection with a valve closing body.
  • a belonging to a confirmation strand valve needle has at its discharge end the valve closing body, which cooperates with a valve seat surface to a sealing seat.
  • the actuator is arranged in an upper housing part.
  • a flexible portion in the form of a spring membrane hermetically seals the upper housing member against a fuel-filled lower housing member. The flexible portion is on the one hand circumferentially hermetically sealed to a Aktorpin belonging to the confirmation strand and on the other hand to the inner surfaces of the lower housing part.
  • a metering valve for metering a pressurized metering fluid which has a valve chamber with a valve housing for receiving a valve needle.
  • the valve needle is connected to an actuator and is moved over this.
  • the actuator has a piezoelectric actuator which is arranged in an actuator chamber bounded by a housing, wherein the piezoelectric actuator has at least one actuator stack and the actuator stack is clamped with its end faces between a cover element and a bottom element and wherein the actuator stack of a provided in the actuator chamber hydraulic fluid is washed around.
  • the US Pat. No. 6,435,430 B1 discloses a fuel injector having a fuel inlet port for supplying fuel, a piezoelectric or magnetostrictive actuator sealed by a seal against the fuel is, and one of the actuator by means of a valve needle operable valve closing body which cooperates with a valve seat surface to a sealing seat.
  • the seal comprises an inflow-side sealing plate, which is arranged between the fuel inlet nozzle and the actuator, and an elastically deformable in the longitudinal direction actuator sheath, which is connected to the inflow-side sealing plate.
  • the actuator casing is in particular wave-shaped or folded.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that the flexible portion, which is connected to the actuating strand and hermetically seals the interior of the actuator housing from the exterior of the actuator housing, can be optimized in terms of the force effects of the actuating strand movements. Force effects which originate from pressure fluctuations in the interior of the actuator housing or resulting from pressure differences between the interior of the actuator housing and the exterior of the actuator housing, must not be taken into account in the dimensioning and design of the flexible section, since these force effects are largely offset by the compensation element ,
  • the movements of the actuation strand do not act directly on the compensation element, since it is structurally separated from the actuation strand.
  • the compensating element can thereby be optimized with regard to the force effect of the pressure differences.
  • the relief of the flexible section results in that the flexible section can be subjected to higher loads with regard to the forces which act on the flexible section via the confirmation strand. In particular, in reciprocating internal combustion engines, this allows an increase in the injection frequency. It also increases the life of the seal.
  • the fuel injection valve according to the invention with the features of the dependent claim 4 has the advantage over the prior art that the flexible portion can extend at least over the entire length of the actuator. Forces resulting from pressure differentials between the inside and the outside of the actuator housing are distributed evenly over the enlarged area of the flexible portion. The force-related stress of the flexible section per unit area by pressure differences is thus reduced.
  • the stress of the flexible section by the movements of the confirmation string are distributed to a greater length. This results in a reduced stress on the flexible section per unit length.
  • the compensation element is a membrane.
  • Membranes can be easily and inexpensively manufactured, wherein the properties of the membrane, such. B. the flexibility can be adjusted in a simple manner.
  • the compensation element and / or the flexible section consists at least partially of metal, in particular of steel.
  • Metals are excellent adjustable plastic and elastic properties. Steel has little fluctuating properties in the range of operating temperatures of a fuel injection valve and can be procured and processed at low cost.
  • the actuator housing is flattened or flattened at the connection point to the compensation element and thus forms a non-curved, two-dimensional plane.
  • the compensation element can be produced, for example, from a simple plate. Tensions within the compensating element and at the junction between the actuator housing and compensating element are thereby avoided.
  • the actuator housing may advantageously be flowed around by fuel. The heat loss of the actuator is thus removed in a simple manner via the heat-conducting medium and the actuator housing to the fuel.
  • an incompressible liquid is used as the heat-conducting medium.
  • An adaptation of the compensating element due to a pressure-dependent change in volume of the heat-conducting medium can thus be dispensed with.
  • the heat-conducting medium is a plastic paste, gel or potting compound, then the manufacturing effort can be simplified by these easy-to-use forms.
  • the heat-conducting medium is advantageously not electrically conductive, an additional, heat-insulating and error-prone insulation of the actuator can be dispensed with.
  • the heat-conducting medium is chemically neutral.
  • the life and reliability of the thermally conductive medium contacting components is thereby increased.
  • the flexible section is advantageously corrugated, the flexible section does not cause a pressure difference between the interior and exterior of the actuator housing during axial stretching or compression.
  • 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 housing 2 are coaxial with each other, a piston-shaped coupler 18, a cylindrical or cylindrical actuator housing 12; a guide body 9 and a valve needle 3 with a valve closing body 4 are arranged.
  • the housing 2 has a fuel supply 17 at its upper end remote from the sprayer.
  • the coupler 18 is supported with its upper end against the inside of the upper end of the housing 2.
  • the cylindrical actuator housing 12 connects.
  • a piston-shaped actuator 14 is disposed between the inside of the upper end of the actuator housing 12 and a T-shaped Aktorpin 13 in cross-section.
  • the cross-section of the actuator 14 can, unlike a circular cross-section, also be square or hole-disc-shaped.
  • the actuator housing 12, deviating from a circular cross-section, may be formed corresponding to the cross section of the actuator 14.
  • the longitudinal element of the T. shaped Aktorpins 13 passes through the underside of the actuator housing 12.
  • the actuator housing 12 is completely filled with a heat-conducting medium.
  • the heat-conducting medium is an electrically non-conductive oil.
  • the disc-shaped guide body 9, in which both the lower end of the Aktorpins 13 and the upper end of the valve needle 3 are guided, has a fuel channel 10.
  • Abspritzicillin the guide body 9, the valve needle 3 is arranged with its valve closing body 4, a return spring 7, a flange 8 and a discharge opening 5.
  • the return spring 7 is supported on the inside of the lower end of the actuator housing 12 and presses into the valve needle 3 via the fixed to the valve needle 3 flange 8 with a bias against the lower end of the Aktorpins thirteenth
  • An electrical connection 20 is guided through the upper end of the housing 2 and laterally through the actuator housing 12 to the actuator 14.
  • a compensation element 16 is disposed in an opening 21 of the actuator housing 12.
  • the compensating element 16 in this embodiment has the shape of a membrane, is made of steel and seals the opening 21 hermetically.
  • the operation of the fuel injection valve 1 is as follows.
  • the actuator 14 In the rest position of the outwardly opening fuel injection valve 1, the actuator 14 is not energized.
  • the return spring 7 presses on the flange 8 and the valve needle 3, the valve closing body 4 against a arranged in the injection opening 5 valve seat surface 6. A formed by the valve closing body 4 and the valve seat 6 sealing seat is thus closed.
  • the actuator 14 For actuating the fuel injection valve 1, the actuator 14 is energized.
  • the actuator 14 expands in the longitudinal direction against the spring force of the spring element 15 and moves the existing in this embodiment of the Aktorpin 13 and the valve needle 3 confirmation strand 3.13 in Abspritzides.
  • the return spring 7 is compressed.
  • the valve closing body 4 lifts off from the valve seat surface 6 and the fuel supplied under pressure via the fuel feed 17 and the fuel channel 10 is sprayed off via the injection opening 5.
  • the compensation element 16 compensates for pressure differences, which are caused in particular by volume changes of the actuator 14.
  • the volume changes are made via the actuator housing 12, which is completely filled with the heat-conducting oil, to the flexible section 11 and the compensation element 16 transmitted in the form of a pressure change.
  • the softer and more resilient compared to the flexible portion 11 compensated compensation element 16 compensates for the volume changes and relieves the flexible portion 11 thereby from a pressure load, which are caused in particular by volume changes of the actuator 14 and the heat-conducting medium.
  • the corrugated tube-shaped flexible section 11 in this exemplary embodiment can therefore be replaced with a sufficient pressure relief by a simple membrane, not shown. Due to the complete structural separation of confirmation strand 3.13 and compensation element 16 is further achieved that the compensation element 16 is not burdened by the movements of the confirmation strand 3.13.
  • the fuel injection valve 1 may also have a Hubübersetzs observed not shown, which converts a small Aktorhub to a larger valve.
  • the Hubüber relies heard not shown may be part of the confirmation string 3.13.
  • the coupler 18 serves, in particular, to compensate for the thermal expansion of the actuator 14, is hermetically sealed with respect to the fuel surrounding it and is preferably designed with a flat membrane (not shown).
  • the coupler 18 can also be arranged between actuator 14 and valve needle 3 and be part of the confirmation strand 3, 13, wherein the actuator housing 19 would abut against the spray-away end of the inside of the housing 2.
  • An unillustrated coupler pin then transmits the stroke of the actuator 14 to the valve needle. 3
  • Fig. 2 shows a schematic representation of a fuel injection valve 1, similar to the first in Fig. 1 illustrated embodiment.
  • the flexible portion 11 forms a majority of the actuator housing 12.
  • the radially arranged to the actuator 14 sides 19 of the actuator housing 12 are in this Embodiment completely formed by the flexible portion 11, wherein the flexible portion 11 has the shape of a corrugated tube.
  • the flexible portion 11 may thus extend at least over the entire length of the actuator 14. Forces resulting from pressure differences between the inside and the outside of the actuator housing 12 are evenly distributed over the enlarged area of the flexible portion 11. The physical stress of the flexible portion 11 per unit area by pressure differences is thus reduced.
  • the stress of the flexible section 11 by the movements of the confirmation strand 3, 13 are distributed over a greater length. This results in a reduced stress on the flexible section 11 per unit length.
  • the invention is not limited to the illustrated embodiments and 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 (11)

  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 (14), et un corps de fermeture de soupape (4) en liaison fonctionnelle avec l'actionneur (14) par le biais d'une chaîne d'actionnement (3, 13), lequel coopère avec une surface de siège de soupape (6) pour former un ajustement étanche, l'actionneur (14) étant entouré hermétiquement par un boîtier d'actionneur (12) ayant une portion flexible (11), la portion flexible (11) étant connectée à la chaîne d'actionnement (3, 13) et l'actionneur (14) étant entouré dans le boîtier d'actionneur (12) par un milieu thermoconducteur,
    caractérisée en ce que
    le boîtier d'actionneur (12) présente, dans une ouverture (21) dans un côté (19) qui est disposé radialement par rapport à l'actionneur (14), un élément d'équilibrage (16) pour équilibrer les différences de pression entre l'intérieur et l'extérieur du boîtier d'actionneur (12), l'élément d'équilibrage (16) étant une membrane qui ferme hermétiquement l'ouverture (21).
  2. Soupape d'injection de carburant (1) selon la revendication 1,
    caractérisée en ce que
    l'élément d'équilibrage (16) se compose au moins en partie de métal, notamment d'acier.
  3. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le boîtier d'actionneur (12) forme au niveau du point de connexion avec l'élément d'équilibrage (16) un plan bidimensionnel non courbe.
  4. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    des côtés (19) du boîtier d'actionneur (12) disposés radialement par rapport à l'actionneur (14) forment la portion flexible (11).
  5. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    du carburant circule autour du boîtier d'actionneur (12).
  6. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le milieu thermoconducteur est un liquide incompressible.
  7. Soupape d'injection de carburant (1) selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    le milieu thermoconducteur est une pâte plastique, un gel, ou une masse de scellement.
  8. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le milieu thermoconducteur n'est pas électriquement conducteur.
  9. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le milieu thermoconducteur est chimiquement neutre.
  10. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la portion flexible (11) est réalisée sous forme de tube ondulé.
  11. Soupape d'injection de carburant (1) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la portion flexible (11) se compose au moins en partie de métal, en particulier d'acier.
EP20030015164 2002-12-19 2003-07-04 Soupape d'injection de carburant Expired - Lifetime EP1431568B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002159801 DE10259801A1 (de) 2002-12-19 2002-12-19 Brennstoffeinspritzventil
DE10259801 2002-12-19

Publications (3)

Publication Number Publication Date
EP1431568A2 EP1431568A2 (fr) 2004-06-23
EP1431568A3 EP1431568A3 (fr) 2004-12-29
EP1431568B1 true EP1431568B1 (fr) 2011-02-23

Family

ID=32336493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030015164 Expired - Lifetime EP1431568B1 (fr) 2002-12-19 2003-07-04 Soupape d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1431568B1 (fr)
JP (1) JP2004197743A (fr)
DE (2) DE10259801A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004026171B4 (de) * 2004-05-28 2010-05-20 Continental Automotive Gmbh Einspritzventil
JP4944778B2 (ja) 2004-07-07 2012-06-06 コンチネンタル オートモーティヴ ゲゼルシャフト ミット ベシュレンクテル ハフツング 電子式パーキングブレーキと、電子式パーキングブレーキを制御する方法
DE602006021529D1 (de) * 2006-02-03 2011-06-09 Continental Automotive Gmbh Aktoreinheit für ein Einspritzventil und Einspritzventil
DE502006007633D1 (de) 2006-05-09 2010-09-23 Continental Automotive Gmbh Kraftstoffeinspritzsystem und ein Verfahren zum Herstellen dieses Einspritzsystems
DE102006022998A1 (de) * 2006-05-17 2007-11-22 Robert Bosch Gmbh Anordnung mit einem von flüssigen Medien umströmten Piezoaktor
DE102007053423A1 (de) * 2007-11-09 2009-05-14 Robert Bosch Gmbh Piezoelektrisches Aktormodul
JP5246149B2 (ja) * 2009-12-08 2013-07-24 株式会社デンソー インジェクタ
EP2568155B1 (fr) * 2011-09-09 2018-11-14 Continental Automotive GmbH Ensemble de soupape et soupape d'injection
JP2017066955A (ja) * 2015-09-30 2017-04-06 日立オートモティブシステムズ株式会社 流量制御弁

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005455A1 (de) 1989-02-28 1990-08-30 Volkswagen Ag Zumessventil, insbesondere kraftstoff-einspritzventil fuer eine brennkraftmaschine
DE19857247C1 (de) * 1998-12-11 2000-01-27 Bosch Gmbh Robert Piezoelektrischer Aktor
DE19912666A1 (de) * 1999-03-20 2000-09-21 Bosch Gmbh Robert Brennstoffeinspritzentil
DE10035168A1 (de) * 2000-07-19 2002-02-07 Siemens Ag Stellantrieb, Ventil sowie Verfahren zum Herstellen eines Stellantriebs
DE10048430A1 (de) * 2000-09-29 2002-04-25 Bosch Gmbh Robert Piezoelektrischer Aktor
DE10054017A1 (de) * 2000-11-01 2002-05-08 Bosch Gmbh Robert Piezoaktormodul mit Vorrichtung zur Wärmeableitung
DE10245109A1 (de) * 2002-09-27 2004-04-08 Siemens Ag Injektor, insbesondere Kraftstoff-Einspritzventil, mit einem piezoelektrischen Aktor

Also Published As

Publication number Publication date
DE10259801A1 (de) 2004-07-01
EP1431568A2 (fr) 2004-06-23
JP2004197743A (ja) 2004-07-15
EP1431568A3 (fr) 2004-12-29
DE50313486D1 (de) 2011-04-07

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