EP2002114B1 - Élément filtrant dans un injecteur de carburant - Google Patents

Élément filtrant dans un injecteur de carburant Download PDF

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Publication number
EP2002114B1
EP2002114B1 EP07726349A EP07726349A EP2002114B1 EP 2002114 B1 EP2002114 B1 EP 2002114B1 EP 07726349 A EP07726349 A EP 07726349A EP 07726349 A EP07726349 A EP 07726349A EP 2002114 B1 EP2002114 B1 EP 2002114B1
Authority
EP
European Patent Office
Prior art keywords
filter element
fuel
fuel injector
actuator
injector
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.)
Not-in-force
Application number
EP07726349A
Other languages
German (de)
English (en)
Other versions
EP2002114A1 (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 EP2002114A1 publication Critical patent/EP2002114A1/fr
Application granted granted Critical
Publication of EP2002114B1 publication Critical patent/EP2002114B1/fr
Not-in-force 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
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1, such as in the JP 8218974 shown.
  • the high-pressure fuel connection has a bore in which a rod filter is arranged, which prevents impurities from entering the injector.
  • the object of the invention is to provide a fuel injector according to the preamble of claim 1, which has an improved filtering effect.
  • the object relates to a fuel injector with an injector housing which comprises a high-pressure fuel connection and a high-pressure actor receiving space in which an actuator is arranged is, and with a filter element, wherein the filter element is arranged in the Injektorgephaseuse.
  • the invention is characterized in that the filter element is arranged in the radial direction between the actuator and the Injektorgeophuse and has the shape of a sleeve having a plurality of small through holes, which are flowed through during operation of the fuel injector of high-pressure fuel.
  • This has the advantage that the filter element provides a large effective filter area without requiring much space. The flow through the filter element takes place in the radial direction from the inside to the outside or from the outside inwards.
  • the diameter of the through holes is 20 to 40 microns.
  • the through-holes are preferably formed by bores which extend substantially in the radial direction.
  • the holes are preferably drilled by means of a laser device.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that the high-pressure fuel port is in communication with an annular space which extends between the filter element and the injector housing. Through the high-pressure fuel port, the fuel passes into the annulus and from there through the filter element.
  • Another preferred exemplary embodiment of the fuel injector is characterized in that a further annular space extends between the filter element and the actuator. Through the further annular space of the filtered fuel passes into the interior of the injector.
  • the high-pressure fuel port is connected to an annular space which extends between the actuator and the filter element. Through the high-pressure fuel port, the fuel passes into the annulus and from there through the filter element.
  • a further preferred embodiment of the fuel injector is characterized in that the filter element has at one end a feed hopper into which a high-pressure fuel channel opens, which starts from the high-pressure fuel port.
  • the feed hopper is preferably integrally connected to the filter element.
  • Another preferred exemplary embodiment of the fuel injector is characterized in that a further annular space extends between the filter element and the injector housing. Through the further annular space of the filtered fuel passes into the interior of the injector.
  • a further preferred embodiment of the fuel injector is characterized in that a guide ring is attached to at least one end of the filter element.
  • the guide ring may extend radially inwardly or radially outwardly from the filter element. When the guide ring extends radially outwardly, it preferably abuts against the injector housing. When the guide ring extends radially inwardly, it preferably abuts against an actuator piston.
  • the filter element is acted upon at one end in the axial direction with the biasing force of a spring device. The other end of the filter element is preferably against the injector housing.
  • a further preferred embodiment of the fuel injector is characterized in that the annular space and / or the further annular space in the radial direction has an extension of 100 to 200 microns / has.
  • FIG. 1 is a section of a fuel injector 1 with an injector 2 shown in longitudinal section.
  • the injector housing 2 comprises an injector body 3, which is also referred to as a holding body.
  • a high-pressure fuel connection is indicated, passes through the high-pressure fuel in a high-pressure fuel passage 6, which is recessed in the holding body 3.
  • the high-pressure fuel channel 6 opens into an orifice region 7 in a main bore 10, which extends in the interior of the holding body 3 in the longitudinal direction.
  • the main bore 10 of the injector body or holding body 3 is closed by an intermediate plate 12.
  • the intermediate plate 12 is clamped by means of a clamping nut 13 between a nozzle body 14 and the holding body 3.
  • the nozzle body 14 protrudes with its lower end shown cut off into the combustion chamber of an internal combustion engine to be supplied with fuel.
  • an axial guide bore is recessed, in which a nozzle needle 15 is guided axially displaceable.
  • At the combustion chamber near the end of the nozzle needle 15 at least one injection hole is provided in a known manner, is injected by the high-pressure fuel from the nozzle body 14 into the combustion chamber of the internal combustion engine when the nozzle needle 15 lifts with its tip from an associated nozzle needle seat.
  • a control chamber limiting sleeve 16 is guided under sealing action, which limits a control chamber 18.
  • the control chamber 18 is connected via a through hole 19 with an actuator pressure chamber 20 in connection.
  • the actuator pressure chamber 20 is delimited by a Aktordruckraumbegrenzungshülse 22, which is guided at the combustion chamber near the end of an actuator piston 24 of a piezoelectric actuator 25.
  • the actuator pressure chamber 20 and the piezoelectric actuator 25 are subjected to high pressure. To protect the piezoelectric actuator 25, this is provided radially on the outside with an insulation 27.
  • a filter element 30 is arranged, which is substantially in the form of a sleeve and therefore also referred to as a filter sleeve 30.
  • the filter sleeve 30 is provided with a plurality of through holes 31, 32, the size of which is such that impurities, such as chips, do not pass through the filter element 30.
  • the filter element 30 At its end remote from the combustion chamber, the filter element 30 has a collar 34 which bears against the holding body 3. At its end close to the combustion chamber, the filter element 30 has a further collar 35, which also bears against the holding body 3. In the axial direction between the collars 34, 35, which are also referred to as guide rings, and in the radial direction outside the filter element 30, an annular space 37 is formed, which is connected to the mouth region 7 of the high-pressure fuel channel 6. The annular space 37 is filled via the high-pressure fuel passage 6 with fuel, which is acted upon by high pressure.
  • the high pressure fuel passes through the through holes 31, 32 of the filter element 30 in a further annular space 38 which is provided in the radial direction between the piezoelectric actuator 25 and the filter element 30.
  • the filtered fuel then passes from the further annular space 38 into the interior of the holding body 3, ie towards the combustion chamber.
  • a coupling ring 39 At the combustion chamber near the end of the filter element 30 and the collar 35 is a coupling ring 39 at. Between the coupling ring 39, which may be formed integrally with the filter element 30 and the collar 35, and the Aktordruckraumbegrenzungshülse 22 is a helical compression spring 40 clamped. By the biasing force of the helical compression spring 40, the filter element 30 is stably held in the illustrated position.
  • the limited by the main bore 10 and acted upon by high pressure Aktorfactraum is connected via two through holes 41 and 42 which are recessed in the intermediate plate 12, with the interior of the nozzle body 14 in connection.
  • the filter sleeve 30 rests with the collars or guide rings 34, 35 on the holding body 3. By the biasing force of the spring 40, the filter sleeve 30 is pressed in the axial direction of the holding body 3.
  • FIGS. 2 to 4 For example, a fuel injector 51 is shown in various views similar to that in FIG FIG. 1 shown fuel injector 1 is similar. To denote the same or similar parts, the same reference numerals are used. To avoid repetition, the preceding description of the FIG. 1 directed. In the following, the differences between the two embodiments are mainly discussed.
  • a filter sleeve 60 is arranged in the radial direction between the piezoelectric actuator 25 and the holding body 3.
  • the filter sleeve 60 comprises, as in FIG. 4 is shown enlarged, a plurality of through holes 61, 62.
  • the filter sleeve 60 At its combustion chamber remote end, the filter sleeve 60 has a guide ring 64 which rests against the holding body 3.
  • the filter sleeve 60 has a guide ring 65 which abuts the actuator piston 24 is applied.
  • annular space 67 is provided which communicates via the through holes 61, 62 in the filter sleeve 60 with another annular space 68 in connection, which is provided in the radial direction between the filter sleeve 60 and the holding body 3.
  • a coupling ring 69 is clamped.
  • the filter element 60 in the region of the mouth region 7 of the high-pressure fuel channel 6 is equipped with a feed funnel 72 which, as can be seen in FIG FIG. 3 sees, a through hole 73 has.
  • the feed funnel 72 surrounds the mouth region 7 of the high-pressure fuel channel 6 so that the fuel from the high-pressure fuel passage 6 passes through the through hole 37 into the annular space 67. From the annular space 67, the fuel passes through the through holes 61, 62 in the filter element 60 into the further annular space 68, as in FIG FIG. 4 indicated by an arrow 78. From the further annular space 68 of the high-pressure fuel then passes into the interior of the nozzle body.
  • filter sleeve 60 is flowed through radially from the inside out. This provides the advantage that the third dimension is taken into account. Thus, chips that have a relatively small diameter, but are relatively long, are stopped by the filter element 60.
  • the in the FIGS. 1 to 4 shown filter elements generally provide the advantage that they have a good filtering effect, without taking advantage of pressure wave effects. The large area with the plurality of holes prevents wear of the filter element in its lifetime.

Landscapes

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

Claims (9)

  1. Injecteur de carburant comprenant un boîtier d'injecteur (2), qui comprend un raccord de carburant haute pression (5) et un espace de logement d'actionneur sollicité par une haute pression, dans lequel est disposé un actionneur (25), et comprenant un élément filtrant (30 ; 60), l'élément filtrant (30 ; 60) étant disposé dans le boîtier d'injecteur (2), caractérisé en ce que l'élément filtrant (30 ; 60) est disposé dans la direction radiale entre l'actionneur (25) et le boîtier d'injecteur (2) et présente la forme d'une douille ayant une pluralité de petits orifices de passage (31, 32 ; 61,62) lesquels sont parcourus par du carburant sollicité à haute pression pendant le fonctionnement de l'injecteur de carburant.
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que le diamètre des orifices de passage (31,32 ; 61,62) est de 20 à 40 µm.
  3. Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce que le raccord de carburant haute pression (5) est en liaison avec un espace annulaire (37) qui s'étend entre l'élément filtrant (30) et le boîtier d'injecteur (2).
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce qu'un espace annulaire supplémentaire (38) s'étend entre l'élément filtrant (30) et l'actionneur (25).
  5. Injecteur de carburant selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le raccord de carburant haute pression (5) est en liaison avec un espace annulaire (67) qui s'étend entre l'actionneur (25) et l'élément filtrant (60).
  6. Injecteur de carburant selon la revendication 5, caractérisé en ce que l'élément filtrant (60) présente, à une extrémité, un entonnoir d'alimentation (72) dans lequel débouche un canal de carburant haute pression (6), lequel part du raccord de carburant haute pression (5).
  7. Injecteur de carburant selon la revendication 5 ou 6, caractérisé en ce qu'un espace annulaire supplémentaire (68) s'étend entre l'élément filtrant (60) et le boîtier d'injecteur (2).
  8. Injecteur de carburant selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une bague de guidage (34,35 ; 64,65) est montée à au moins une extrémité de l'élément filtrant (30 ; 60).
  9. Injecteur de carburant selon l'une quelconque des revendications 3 à 8, caractérisé en ce que l'espace annulaire (37 ; 67) et/ou l'espace annulaire supplémentaire (38 ; 68) présente(nt) dans la direction radiale une étendue de 100 à 200 µm.
EP07726349A 2006-03-28 2007-02-12 Élément filtrant dans un injecteur de carburant Not-in-force EP2002114B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006014243A DE102006014243A1 (de) 2006-03-28 2006-03-28 Kraftstoffinjektor
PCT/EP2007/051327 WO2007110268A1 (fr) 2006-03-28 2007-02-12 Élément filtrant dans un injecteur de carburant

Publications (2)

Publication Number Publication Date
EP2002114A1 EP2002114A1 (fr) 2008-12-17
EP2002114B1 true EP2002114B1 (fr) 2010-11-24

Family

ID=37983273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07726349A Not-in-force EP2002114B1 (fr) 2006-03-28 2007-02-12 Élément filtrant dans un injecteur de carburant

Country Status (4)

Country Link
EP (1) EP2002114B1 (fr)
AT (1) ATE489555T1 (fr)
DE (2) DE102006014243A1 (fr)
WO (1) WO2007110268A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3051229B1 (fr) * 2016-05-13 2021-02-19 Delphi Int Operations Luxembourg Sarl Injecteur de carburant pour moteur a combustion interne
DE102017123416A1 (de) * 2017-10-09 2019-04-11 Woodward L'orange Gmbh Kraftstoffinjektor sowie Einspritzsystem für eine Brennkraftmaschine
US10941742B2 (en) 2018-04-09 2021-03-09 Caterpillar Inc. Perforated integral filter sleeve for fuel injector and fuel system setup method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2376292A (en) * 1941-09-26 1945-05-15 Reconstruction Finance Corp Fuel injection nozzle
US3391680A (en) * 1965-09-01 1968-07-09 Physics Internat Company Fuel injector-ignitor system for internal combustion engines
JPH02122164U (fr) * 1989-03-18 1990-10-05
JPH08218974A (ja) * 1995-02-17 1996-08-27 Keihin Seiki Mfg Co Ltd 電磁式燃料噴射弁

Also Published As

Publication number Publication date
DE502007005756D1 (de) 2011-01-05
WO2007110268A1 (fr) 2007-10-04
ATE489555T1 (de) 2010-12-15
EP2002114A1 (fr) 2008-12-17
DE102006014243A1 (de) 2007-10-04

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