EP0999363A1 - Filtre - Google Patents

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Publication number
EP0999363A1
EP0999363A1 EP99308526A EP99308526A EP0999363A1 EP 0999363 A1 EP0999363 A1 EP 0999363A1 EP 99308526 A EP99308526 A EP 99308526A EP 99308526 A EP99308526 A EP 99308526A EP 0999363 A1 EP0999363 A1 EP 0999363A1
Authority
EP
European Patent Office
Prior art keywords
plate
filter
openings
regions
upstream
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.)
Withdrawn
Application number
EP99308526A
Other languages
German (de)
English (en)
Inventor
Michael Peter Cooke
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.)
Delphi Technologies Inc
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0999363A1 publication Critical patent/EP0999363A1/fr
Withdrawn legal-status Critical Current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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector

Definitions

  • This invention relates to a filter, and in particular to a filter suitable for use in a fuel injector to remove particulate contaminants from a flow of fuel.
  • a filter comprising a plate arranged to be received within a bore or drilling of a fuel injector, the plate being provided with a plurality of openings whereby fuel can flow from an upstream side of the plate to a downstream side thereof, the openings having been formed using a micro-machining technique.
  • Each opening conveniently includes an upstream region of relatively large dimensions and a downstream region of relatively small dimensions.
  • Such an arrangement is advantageous in that the downstream regions ensure that small contaminant particles are removed from the flow of fuel, the upstream regions protecting the downstream regions from being impacted by large contaminant particles.
  • a plurality of downstream regions may be associated with each upstream region.
  • the invention also relates to a method of manufacturing such a filter comprising micro-machining a plate to form a plurality of openings.
  • the micro-machining operation may take the form of etching the plate to form the openings.
  • the micro-machining operation may involve building up layers of material, conveniently nickel or chromium, to form the plate and the openings using an electroforming technique. It will be appreciated, however, that other micro-machining techniques may be used.
  • Figure 1 illustrates part of the nozzle holder 10 of a fuel injector, the nozzle holder 10 being provided with a region 10 a which is externally screw-threaded and arranged to have a pipe connector secured thereto to permit the connection of the injector to a source of fuel under high pressure, for example a common rail charged with fuel to an appropriate pressure by a high pressure fuel pump.
  • the nozzle holder 10 is provided with a stepped bore 11 including an inlet region 11 a , and a region 11 b of relatively small dimensions. Intermediate the regions 11 a and 11 b , the bore 11 is shaped to define a filtration region 11 c .
  • the region 11 c is of stepped form and houses a tubular location member 12, the upstream end of which is angled and arranged to support a filtration member in the form of a plate 13 of elliptical shape.
  • the location member 12 is arranged to seat against a step forming part of the region 11 c of the bore 11, the location member 12 being of diameter slightly smaller than that of the adjacent part of the bore to permit the location member 12 to be slid into position.
  • the location member 12 and plate 13 are secured in position by means of a tubular fixing member 14, the downstream end of which is angled similarly to the upstream end of the location member 12, the upstream end of the fixing member 14 being of diameter such that the fixing member 14 is an interference fit within the bore 11.
  • the plate 13 is micro-machined to form a plurality of openings 15 which extend from an upstream surface of the plate 13 to a downstream surface thereof.
  • Each opening 15 comprises an upstream region 15 a which is of relatively great depth and relatively large dimensions and a downstream region 15 b which is of relatively small depth and small dimensions.
  • these contaminant particles are of dimensions greater than the downstream regions 15 b of the openings 15, then, as these contaminant particles will be unable to flow through the downstream regions 15 b , these particles are also prevented from continuing with the flow of fuel towards the nozzle body of the injector. It will therefore be appreciated that only particles of very small dimensions which are able to pass through the downstream regions 15 b of the openings 15 are permitted to continue with the flow of fuel towards the nozzle body of the injector.
  • the dimensions of the downstream regions 15 b are chosen to be sufficiently small that any particles which are able to pass through the downstream regions 15 b will be of sufficiently small dimensions that the risk of significant damage to the injector or of the injectors performance being impaired is relatively low.
  • any contaminant particles flowing with the fuel and incident upon the plate 13 do not impact the plate 13 normal to the plane thereof, thus the risk of damage to the plate 13 is reduced.
  • the area of the plate 13 which can be provided with the openings 15 is increased, thus the available filtration area can be increased.
  • a further advantage of the arrangement illustrated in Figure 1 is that only particles of relatively small dimensions are able to pass through the upstream regions 15 a of the openings 15, thus the downstream region of the plate 13 which defines the downstream regions 15 b , and is relatively fragile, is not impacted by contaminant particles of relatively large dimensions. As a result, the risk of damage to the downstream region of the plate 13 is reduced.
  • FIGS 2 and 3 illustrate the arrangement of Figure 1 in greater detail.
  • the upstream regions 15 a of the openings take the form of a series of parallel grooves.
  • the downstream regions 15 b are defined by a series of slats 16 of small width, the slats 16 defining the downstream regions 15 b extending in a direction perpendicular to the grooves defining the upstream regions 15 a .
  • the slats 16 are relatively thin, it will be appreciated that the slats 16 are relatively fragile, and thus it is important to ensure that contaminant particles of relatively large dimensions are removed from the fuel by being unable to pass through the grooves defining the upstream regions 15 a of the openings 15.
  • the plate 13 is located using a location member 12 and a fixing member 14, the plate 13 not being secured to either of these components, the arrangement may be modified by securing the plate 13 to one or other, or both of these components, if desired.
  • the plate 13 is secured to the fixing member 14, then the provision of the location member 12 may be avoided.
  • the upstream regions 15 a take the form of a matrix of openings of hexagonal form rather than a series of grooves. It will be appreciated, however, that the upstream regions 15 a may be of other shapes, for example squares, triangles, circles or any other shape.
  • Each upstream region 15 a communicates with a plurality of downstream regions 15 b which again take the form of openings. As illustrated in Figure 5, these openings may be of circular cross-section, but again the downstream regions 15 b may take the form of a matrix of openings of any suitable shape. Operation of this embodiment is as described hereinbefore and so will not be described in further detail.
  • the plate 13 of any of the embodiments described hereinbefore may take the form of a relatively thick plate, the openings 15 being formed by etching the plate, the upstream regions 15 a of the openings 15 being etched from one surface of the plate, the downstream regions 15 b being etched from the other surface of the plate.
  • the plate 13 may be manufactured by building up layers of material using an electroforming technique. For example, thin layers of nickel or chromium may be built up to form the plate 13 and the openings 15 which extend through the plate. It will be appreciated, however, that other micro-machining techniques may be used to form the plate 13 and the openings 15 which extend through the plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP99308526A 1998-11-06 1999-10-28 Filtre Withdrawn EP0999363A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9824272.0A GB9824272D0 (en) 1998-11-06 1998-11-06 Filter
GB9824272 1998-11-06

Publications (1)

Publication Number Publication Date
EP0999363A1 true EP0999363A1 (fr) 2000-05-10

Family

ID=10841906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99308526A Withdrawn EP0999363A1 (fr) 1998-11-06 1999-10-28 Filtre

Country Status (2)

Country Link
EP (1) EP0999363A1 (fr)
GB (1) GB9824272D0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004020818A1 (fr) * 2002-08-22 2004-03-11 Siemens Aktiengesellschaft Injecteur destine a un systeme d'injection de carburant d'un moteur a combustion interne et dispositif de filtrage
WO2006034890A1 (fr) * 2004-09-28 2006-04-06 Robert Bosch Gmbh Injecteur pour injecter du carburant sur un moteur a combustion interne
DE102007002071A1 (de) * 2007-01-09 2008-07-10 Reich Gmbh Filter mit Filternuten
EP2339167A1 (fr) * 2009-12-22 2011-06-29 Robert Bosch GmbH Soupape d'injection de combustible

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2112065A (en) * 1981-12-21 1983-07-13 Daimler Benz Ag An i.c. engine fuel injection valve filter arrangement
DE3210209A1 (de) * 1982-03-19 1983-09-29 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
US4876008A (en) * 1988-10-06 1989-10-24 Panel International Ltd. P.L.C. Sieve plate
WO1993018299A1 (fr) * 1992-03-05 1993-09-16 Siemens Automotive L.P. Injecteur de carburant comportant un filtre interne
EP0611886A1 (fr) * 1993-02-17 1994-08-24 Nippondenso Co., Ltd. Buse d'injection de fluide
DE19622350A1 (de) * 1996-06-04 1997-12-11 Bosch Gmbh Robert Verfahren zur Herstellung einer Düsenplatte
US5730368A (en) * 1994-09-30 1998-03-24 Robert Bosch Gmbh Nozzle plate, particularly for injection valves and processes for manufacturing a nozzle plate
DE19638201A1 (de) * 1996-09-19 1998-04-02 Bosch Gmbh Robert Brennstoffeinspritzventil

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2112065A (en) * 1981-12-21 1983-07-13 Daimler Benz Ag An i.c. engine fuel injection valve filter arrangement
DE3210209A1 (de) * 1982-03-19 1983-09-29 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoff-einspritzduese fuer brennkraftmaschinen
US4876008A (en) * 1988-10-06 1989-10-24 Panel International Ltd. P.L.C. Sieve plate
WO1993018299A1 (fr) * 1992-03-05 1993-09-16 Siemens Automotive L.P. Injecteur de carburant comportant un filtre interne
EP0611886A1 (fr) * 1993-02-17 1994-08-24 Nippondenso Co., Ltd. Buse d'injection de fluide
US5730368A (en) * 1994-09-30 1998-03-24 Robert Bosch Gmbh Nozzle plate, particularly for injection valves and processes for manufacturing a nozzle plate
DE19622350A1 (de) * 1996-06-04 1997-12-11 Bosch Gmbh Robert Verfahren zur Herstellung einer Düsenplatte
DE19638201A1 (de) * 1996-09-19 1998-04-02 Bosch Gmbh Robert Brennstoffeinspritzventil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004020818A1 (fr) * 2002-08-22 2004-03-11 Siemens Aktiengesellschaft Injecteur destine a un systeme d'injection de carburant d'un moteur a combustion interne et dispositif de filtrage
WO2006034890A1 (fr) * 2004-09-28 2006-04-06 Robert Bosch Gmbh Injecteur pour injecter du carburant sur un moteur a combustion interne
JP2008514856A (ja) * 2004-09-28 2008-05-08 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 内燃機関において燃料を噴射するためのインジェクタ
US7878427B2 (en) 2004-09-28 2011-02-01 Robert Bosch Gmbh Injector for fuel injection in an internal combustion engine
DE102007002071A1 (de) * 2007-01-09 2008-07-10 Reich Gmbh Filter mit Filternuten
EP2339167A1 (fr) * 2009-12-22 2011-06-29 Robert Bosch GmbH Soupape d'injection de combustible

Also Published As

Publication number Publication date
GB9824272D0 (en) 1998-12-30

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