EP1752654B1 - Injecteur de combustible - Google Patents

Injecteur de combustible Download PDF

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Publication number
EP1752654B1
EP1752654B1 EP20060117188 EP06117188A EP1752654B1 EP 1752654 B1 EP1752654 B1 EP 1752654B1 EP 20060117188 EP20060117188 EP 20060117188 EP 06117188 A EP06117188 A EP 06117188A EP 1752654 B1 EP1752654 B1 EP 1752654B1
Authority
EP
European Patent Office
Prior art keywords
actuator
housing
valve
fuel injection
actuator housing
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
EP20060117188
Other languages
German (de)
English (en)
Other versions
EP1752654A1 (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 EP1752654A1 publication Critical patent/EP1752654A1/fr
Application granted granted Critical
Publication of EP1752654B1 publication Critical patent/EP1752654B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim. It is already a fuel injector from the DE 103 08 879 A1 known, with an actuator housing mounted in a valve housing, in which a piezoelectric actuator is provided. Due to the high-frequency circuit of the piezoelectric actuator, high dynamic operating forces occur, which arise due to the acceleration of comparatively large masses, for example of the actuator and the valve needle. In this case, large force changes take place per unit time, which are known to stimulate structure-borne noise. This structure-borne sound emitted by the fuel injection valve is transmitted to the internal combustion engine and emitted as airborne sound, so that the generated noise of the fuel injection valve exceeds a predetermined value.
  • a fuel injection valve with an actuator housing is known, which is provided free of storage at its ends and is penetrated by an opening of a storage.
  • the bearing extends from the valve housing to the actuators arranged in the actuator housing.
  • the opening is provided with play for the Aktorhub. Due to the actuator stroke, the actuator housing moves relative to the valve housing, whereby the valve needle is actuated.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that in a simple manner a reduction of the structure-borne sound excitation and thus the noise is achieved by the actuator housing is provided free of storage at its ends and has a single bearing for connection to the valve housing ,
  • the only storage is provided on the circumference of the actuator housing between the two ends of the actuator housing, as can be achieved in this way that the actuator housing can perform two opposite Operahübe in the axial direction.
  • the only bearing is provided in the region of the middle of the longitudinal extent of the actuator housing, since in this way the static and dynamic forces compensate each other so that only slight temporal force changes occur in the single bearing and thus stimulate only little structure-borne noise becomes.
  • the single bearing as a shoulder.
  • valve housing has a second shoulder for attachment to an internal combustion engine, which is seen in the axial direction in the region of a force-neutral plane, since only in this plane, the static and dynamic forces are balanced and transmit little structure-borne noise to the adjacent internal combustion engine becomes.
  • the both sides of the force neutral plane arranged in the valve housing, axially movable masses are advantageously summarized on each side at least approximately equal to achieve a balance of power in the force neutral plane.
  • the actuator housing is mounted such that in each case a partial stroke in the direction of the valve needle and a partial stroke in the direction away from the valve needle direction is executable. In this way, opposing forces can be achieved, which cancel each other at least partially in the single storage.
  • the actuator housing acts with its one end on a valve needle and on a valve needle facing away from a compensation element having a balancing mass.
  • the compensation element By means of the compensation element a balance of forces in the storage area is achieved, so that there are no high temporal force changes.
  • the actuator is a piezoelectric actuator, shape memory actuator or a magnetostrictive actuator.
  • the drawing shows in section an inventive fuel injection valve.
  • the fuel injection valve serves, for example, to inject fuel into a combustion chamber of an internal combustion engine and is used, for example, in what is known as direct injection.
  • the fuel injection valve can also inject the fuel into a suction pipe of an internal combustion engine.
  • the fuel injection valve has an example cylindrical valve housing 1 with an input channel 2 for the fuel.
  • the input channel 2 opens into a valve chamber 1.1 of the valve housing 1, in which an axially movable valve needle 4 is provided, which is adjustable by means of an actuator 3.
  • the valve needle 4 has, for example, a needle shaft 7 facing the actuator 3 and a valve closing body 8 facing away from the actuator 3.
  • the actuator 3 transmits its movement, for example via a schematically illustrated coupler element 9 the needle shaft 7 of the valve needle 4, whereby the cooperating with a valve seat 10 valve closing body 8 opens or closes the fuel injection valve.
  • the valve closing body 8 lies tight against the valve seat 10 with line or surface contact over its entire circumference and forms a sealing seat 12.
  • the actuator 3 expands when an electrical voltage is applied or shortens.
  • the actuator 3 is designed as a piezoelectric or magnetostrictive actuator or as a so-called shape memory actuator.
  • a piezoelectric actuator 3 consists of a plurality of piezoceramic layers, which perform an expansion in the axial direction by applying an electrical voltage. In this case, the so-called inverse piezoelectric effect is utilized in which electrical energy is converted into mechanical energy.
  • the actuator 3 is surrounded by a cylindrical actuator housing 22, for example a tubular spring with bone-shaped recesses 23, which biases the actuator 3 in the axial direction with respect to a valve axis 21 to pressure and protects it in this way from harmful tensile stresses.
  • a cylindrical actuator housing 22 for example a tubular spring with bone-shaped recesses 23, which biases the actuator 3 in the axial direction with respect to a valve axis 21 to pressure and protects it in this way from harmful tensile stresses.
  • the coupler element 9 is clamped between the actuator housing 22 and the valve needle 4.
  • the actuator housing 22 and the coupler element 9 are arranged, for example, in an inner space 14.1 of an inner housing 14 provided in the valve chamber 1.1 of the valve housing 1 in order to encapsulate the actuator 3 and the coupler element 9 with respect to the fuel.
  • the inner housing 14 is part of the valve housing 1 and, for example, cylindrical. However, the inner housing 14 may also be omitted if the actuator 3 is sufficiently fuel-resistant or sealed in any other way than with the inner housing 14 relative to the fuel.
  • the actuator housing 22 and the coupler element 9 are then arranged directly in the valve chamber 1.1.
  • the valve housing 1 has, for example, a cover 19, which closes the valve housing 1 and the inner housing 14 at the end.
  • the needle shaft 7 of the valve needle 4 extends partly in the interior 14.1, for example, starting from the coupler element 9, in the direction of the valve seat 10 and extends through the inner housing 14 through a passage opening 15 to outside of the inner housing 14.
  • the passage opening 15 of the inner housing 14 is by means of a seal 16, for example by means of a bellows, which is connected at its one end to the inner housing 14 and at its other end to the needle shaft 7, sealed from the fuel, so that no fuel from the valve housing 1 can get into the inner housing 14.
  • valve housing 1, the inner housing 14, the actuator housing 22 with the actuator 3, the coupler element 9 and the valve needle 4 are, for example, arranged concentrically with each other with respect to the valve axis 21 extending in the direction of the valve needle 4.
  • the expansion or contraction of the actuator 3 generated by the application of the electrical voltage is transmitted to the valve needle 4, wherein the valve needle 4, for example, executes a stroke of 40 to 50 microns.
  • the actuator 3 shortens or expands after switching off the electrical voltage and the valve needle 4 is moved back in the direction of the valve seat 10 by means of a return spring 18 and closes the fuel injection valve.
  • the coupler element 9 Since the actuator 3 and the other components of the fuel injection valve, for example the valve housing 1, expand differently due to different thermal expansion coefficients with temperature change, the coupler element 9 must compensate for the differences in the different linear expansion, to ensure that the fuel injection valve with the valve needle 4th regardless of the respective temperature of the fuel injection valve during an opening movement in each case executes the same stroke as the actuator 3. It must not lift losses occur in which the stroke of the actuator 3 is not completely transferred to the valve needle 4, so that the stroke of the valve needle 4 is smaller is as the stroke of the actuator 3.
  • the coupler element 9 is for example a so-called hydraulic coupler.
  • a hydraulic coupler is for example from the DE102004015622 A1 known.
  • the fuel downstream of the inlet channel 2 is guided for example via a first annular gap 5 between the valve housing 1 and the inner housing 14 and a second annular gap 6 between the valve housing 1 and the valve needle 4 to the valve seat 10 and occurs with the fuel injection valve open through an outlet opening between the valve closing body 8 and the valve seat 10 off.
  • the structure-borne sound excitation and the airborne sound radiation are reduced in the present invention by the actuator housing 22 is arranged without storage at its ends, with a single bearing 24 for connecting the actuator housing 22 with the valve housing 1, for example, with the inner housing 14 is provided.
  • the actuator housing 22 according to the invention has the degree of freedom to expand not only in the direction of the valve needle 4, but also in the opposite direction.
  • the mass forces of the accelerated masses are at least partially equal, since the actuator housing 22 with the actuator 3 does not expand or contract in one direction, as in the prior art, but executes two opposite partial strokes.
  • the mass of the moving parts for example, the actuator 3, the actuator housing 22, the coupler element 9 and the valve needle 4, understood.
  • the single bearing 24 is formed between the two ends of the actuator housing 22. It extends from the circumference of the actuator housing 22 in the radial direction with respect to the valve axis 21 to a wall of the valve housing 1, for example of the inner housing 14, so that the actuator housing 22 is fixedly connected to the valve housing 1, for example by welding. In this way, the storage 24 is designed as a so-called fixed bearing.
  • the bearing 24 is formed according to one embodiment as an annular first shoulder 25, which extends from the valve housing 1, starting to the actuator housing 22. Instead of an annular first shoulder 25 distributed webs 22 may be provided over the circumference of the actuator housing.
  • the first shoulder 25 is, for example, integrally connected to the inner housing 14 and welded to the actuator housing 22.
  • the actuator housing 22 has an axial center with respect to its longitudinal extent in the direction of the valve axis 21.
  • the bearing 24 is provided in the region of this axial center.
  • the bearing 24 can also be arranged outside the axial center between the two ends of the actuator housing 22.
  • the actuator housing 22 is supported in the region of a force-neutral, axial plane 29, that the axially movable masses arranged on both sides of the axial plane 29 in the valve housing 1 are summarized on each side at least approximately equal.
  • a compensating element 30 is arranged with a balancing mass, which is integrally connected to the actuator housing 22, for example.
  • the actuator housing 22 is imaginary divided by the axial plane 29 into two sections. For example, the mass of the valve needle 4, the coupler element 9 and the valve needle 4 facing portion of the actuator housing 22 together at least approximately as large as together the mass of the valve needle 4 facing away portion of the actuator housing 22 and the compensating element 30th
  • a compression spring 31 which acts, for example, on the compensation element 30 against the return spring 18.
  • the valve housing 1 has a second shoulder 26 for attachment to an internal combustion engine, wherein the second shoulder 26 seen in the axial direction, for example, in the region of the axial plane 29, in which the sum of the static and dynamic forces over wide frequency ranges at least approximately zero.

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 (9)

  1. Injecteur de carburant comportant un boîtier d'actionneur (22) logé dans un boîtier d'injecteur (1), le boîtier d'actionneur logeant un actionneur (3),
    le boîtier d'actionneur (22) n'ayant pas d'appui à ses extrémités et comportant un unique palier (24) pour être relié au boîtier d'injecteur (1),
    caractérisé en ce que
    le palier (24) est un palier fixe et il s'étend à partir de la périphérie du boîtier d'actionneur (22) jusque contre la paroi du boîtier d'injecteur (1) et
    le boîtier d'actionneur (22) est monté à l'aide du palier (24) dans la région d'un plan axial (29) neutre vis-à-vis des forces, de façon que les masses mobiles axialement qui se trouvent des deux côtés du plan axial (29) dans le boîtier d'injecteur (1), soient globalement au moins sensiblement de la même dimension.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'unique palier (24) est prévu à la périphérie du boîtier d'actionneur (22) entre les deux extrémités du boîtier d'actionneur (22).
  3. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'unique palier (24) est prévu dans la région du milieu de l'extension longitudinale du boîtier d'actionneur (22).
  4. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'unique palier (24) est un épaulement (25).
  5. Injecteur de carburant selon la revendication 4,
    caractérisé en ce que
    le boîtier d'injecteur (1) comporte un second épaulement (26) pour sa fixation à un moteur à combustion interne, ce second épaulement se situant dans la région du plan (29) neutre vis-à-vis des forces, lorsqu'on regarde dans la direction axiale.
  6. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le boîtier d'actionneur (22) est monté de façon à pouvoir effectuer respectivement une course partielle en direction de l'aiguille d'injecteur (4) et une course partielle dans la direction opposée à celle de l'aiguille d'injecteur (4).
  7. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le boîtier d'actionneur (22) coopère par l'une de ses extrémités avec une aiguille d'injecteur (4) et par l'extrémité opposée à celle de l'aiguille d'injecteur (4), il comporte un élément de compensation (30) avec une masse d'équilibrage.
  8. Injecteur de carburant selon la revendication 1,
    caractérisé par
    un ressort de rappel (18) agissant sur l'aiguille d'injecteur (4) dans le sens du rappel et un ressort de poussée (31) agissant sur le boîtier d'actionneur (22) dans le sens opposé au ressort de rappel (18).
  9. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    l'actionneur (3) est un actionneur piézo-électrique, un actionneur à mémoire de forme ou un actionneur magnétostrictif.
EP20060117188 2005-08-08 2006-07-14 Injecteur de combustible Expired - Fee Related EP1752654B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510037267 DE102005037267A1 (de) 2005-08-08 2005-08-08 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP1752654A1 EP1752654A1 (fr) 2007-02-14
EP1752654B1 true EP1752654B1 (fr) 2008-05-28

Family

ID=36997730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060117188 Expired - Fee Related EP1752654B1 (fr) 2005-08-08 2006-07-14 Injecteur de combustible

Country Status (2)

Country Link
EP (1) EP1752654B1 (fr)
DE (2) DE102005037267A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2941746A1 (fr) * 2009-02-02 2010-08-06 Renault Sas Dispositif d'injection de liquide, notamment de carburant, a actionneur electroactif.
FR2941745A3 (fr) * 2009-02-02 2010-08-06 Renault Sas Dispositif d'injection de liquide, notamment de carburant.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19918976A1 (de) * 1999-04-27 2000-11-02 Bosch Gmbh Robert Brennstoffeinspritzventil und Verfahren zu dessen Betätigung
DE10158789A1 (de) * 2001-11-30 2003-07-10 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10342771A1 (de) * 2003-09-16 2005-04-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102004050224A1 (de) * 2004-10-15 2006-04-20 Robert Bosch Gmbh Aktormodul

Also Published As

Publication number Publication date
DE502006000825D1 (de) 2008-07-10
EP1752654A1 (fr) 2007-02-14
DE102005037267A1 (de) 2007-02-15

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