EP2818687A1 - Kraftstoffeinspritzer - Google Patents

Kraftstoffeinspritzer Download PDF

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Publication number
EP2818687A1
EP2818687A1 EP13173947.6A EP13173947A EP2818687A1 EP 2818687 A1 EP2818687 A1 EP 2818687A1 EP 13173947 A EP13173947 A EP 13173947A EP 2818687 A1 EP2818687 A1 EP 2818687A1
Authority
EP
European Patent Office
Prior art keywords
injector
groove
needle
flange
bore
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Withdrawn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
EP13173947.6A
Other languages
English (en)
French (fr)
Inventor
Guillaume Brignon
Marion Balin
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 International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
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 Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to EP13173947.6A priority Critical patent/EP2818687A1/de
Priority to PCT/EP2014/062239 priority patent/WO2014206753A1/fr
Publication of EP2818687A1 publication Critical patent/EP2818687A1/de
Withdrawn legal-status Critical Current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
    • F02M61/04—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the present invention relates to a fuel injector and more particularly to a collar which are equipped with some and which forms an annular restriction to the passage of fuel under pressure.
  • the fuel injectors have a tubular body of which one end forms a nozzle and in the body a needle driven between an "open nozzle” position and a "closed nozzle” position.
  • the needle of some injectors is provided with a flange extending radially to the vicinity of the body to form an annular restriction through which the pressurized fuel must pass which generates a pressure drop helping to control the needle.
  • the profile of the restriction, the axial length, and the diameter of the flange are critical. The nominal dimensions must be carefully chosen and the manufacturing tolerances are very tight, especially to take into account the temperature sensitivity for which a short length or sharp edge, and a minimum restriction are preferable.
  • the present invention aims to solve these problems by providing a pressurized fuel injector comprising a tubular body extending along a longitudinal axis provided with an axial bore and a needle arranged axially sliding in the bore.
  • the needle is of smaller cross section than the bore, the fuel flowing in the tubular space between the needle and the wall of the bore.
  • the needle is locally provided with a collar forming a restriction to the passage of fuel.
  • the flange extends radially from the needle to near the wall of the bore and longitudinally between an upstream face and a downstream face.
  • the flange is provided in its longitudinal peripheral wall of at least one groove so as to create at least two restrictions that the fuel must pass in series. Thus the manufacturing tolerances of the collar can be enlarged.
  • the depth of the groove is much smaller than the radial extent d of the collar.
  • the depth of the groove is at least 0.2 mm, preferably between 0.4 mm and 0.6 mm.
  • the width of the groove, measured longitudinally along the peripheral wall of the collar is less than the longitudinal length of the flange measured between the upstream face and the downstream face.
  • the width of the groove is between 0.5 mm and 1.5 mm and preferably between 0.8 mm and 1.2 mm.
  • profile of the groove may be trapezoidal or semi-circular or semi-oblong or triangular or rectangular or any other geometry.
  • the flange is provided with two grooves.
  • the groove is helical forming a thread in the peripheral wall.
  • At least one of the upstream or downstream faces may be provided with a peripheral chamfer.
  • An injector 10 of fuel C comprises a tubular body 12 extending along a longitudinal axis A.
  • the interior of the body 12 is a bore 14 having a cylindrical wall 16 of diameter d1.
  • an injection nozzle At one end of the body is formed an injection nozzle and, in the bore 14 is arranged axially sliding a needle 18 of diameter d2, driven as a function of the pressure difference between a control chamber located upstream and the nozzle located downstream, between a closed nozzle position and an open nozzle position.
  • the diameter d2 of the needle 18 is smaller than the diameter of the cylindrical wall 16. Also, does the pressurized fuel C circulate without loss of pressure in the tubular space E situated between the cylindrical wall 16 and the 18 L needle.
  • needle 18 is further provided with a flange 20 forming a restriction R at the passage of the fuel C.
  • the flange 20 extends longitudinally A over a length L between an upstream transverse face 22 and a transverse transverse face 24 of diameters d3, and which are connected by a peripheral wall 26 substantially parallel to the cylindrical wall 16 of the bore 14, the restriction R being the thin space between said peripheral walls 26 and cylindrical 16.
  • the upstream faces 22 and downstream 24 are shown symmetrical to each other and provided with peripheral chamfers 32. Alternatively, they may be fully sloping, conical or slightly rounded and they may have different diameters and chamfers.
  • the peripheral wall 26 of the flange 20 is provided with an annular groove 28 substantially equidistant from the upstream faces 22 and swallows 24.
  • the groove 28 may be eccentric and made closer to one than the other.
  • the groove 28 is defined by its profile P, its depth D measured between the peripheral wall 26 and the bottom 30 of the groove 28 and its width S measured at the peripheral wall 26.
  • the collar 20 creates a upstream restriction R1 and a restriction avale R2 identical separated from each other by the width S of the groove 28.
  • the depth D of the groove 28 is much smaller than the diameter d3 of the collar 20 and the separation width S is also much smaller than the longitudinal length L of the flange 20.
  • the depth D of the groove 28 is at least 0.2 mm.
  • the depth D is between 0.4 mm and 0.6 mm.
  • the separation width S is between 0.5 mm and 1.5 mm.
  • the width S is between 0.8 mm and 1.2 mm.
  • upstream restrictions R1 and downstream R2 shown are identical, however, according to a non-illustrated embodiment, they may be different both in individual longitudinal length, the groove 28 being for example off-center, and in individual radial distance, the upstream face 22 and the downstream face 24 having different diameters.
  • the fuel C flowing from the upstream undergoes a first pressure expansion, or loss of load, through the upstream restriction R1 and a second expansion through the downstream restriction R2.
  • the groove 28 may have different profiles P.
  • the figures illustrate several examples of non-limiting profile P of the invention.
  • the profile P can be chosen trapezoidal figure 1 , semicircular figure 2 , trapezoidal again but of larger size figure 3 , oblong figure 4 .
  • Other profiles, triangular or rectangular for example, are of course possible.
  • the flange 20 is provided with two grooves 28 thus creating three restrictions which must be successively crossed by the fuel C.
  • the two grooves 28 of the figure 5 are trapezoidal and identical. Obviously we can choose other profiles, including any of those presented before. In addition the two grooves may have P profiles different from each other and different dimensions.
  • the collar 20 may be provided with three grooves 28 or even four or more, each having its profile P and its dimensions D, S, clean.
  • the separate grooves as represented on the figure 5 may be replaced by one or two threads several threads forming one or more helical grooves each making at least one turn of the collar 20.
  • the needle 18, the flange 20 have been represented circular of revolution.
  • the invention is not limited to this geometry and can be extended to any type of transverse section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP13173947.6A 2013-06-27 2013-06-27 Kraftstoffeinspritzer Withdrawn EP2818687A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13173947.6A EP2818687A1 (de) 2013-06-27 2013-06-27 Kraftstoffeinspritzer
PCT/EP2014/062239 WO2014206753A1 (fr) 2013-06-27 2014-06-12 Injecteur de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13173947.6A EP2818687A1 (de) 2013-06-27 2013-06-27 Kraftstoffeinspritzer

Publications (1)

Publication Number Publication Date
EP2818687A1 true EP2818687A1 (de) 2014-12-31

Family

ID=48745724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13173947.6A Withdrawn EP2818687A1 (de) 2013-06-27 2013-06-27 Kraftstoffeinspritzer

Country Status (2)

Country Link
EP (1) EP2818687A1 (de)
WO (1) WO2014206753A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018036966A1 (fr) * 2016-08-24 2018-03-01 Delphi Technologies Ip Limited Corps de buse d'injecteur de carburant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107388880B (zh) * 2016-05-17 2019-04-05 四川日机密封件股份有限公司 交叉循环换热装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000206A1 (de) * 2009-01-14 2010-07-15 Robert Bosch Gmbh Kraftstoffinjektor für Brennkraftmaschinen
DE102010044088A1 (de) * 2010-11-18 2012-05-24 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
EP2568157A1 (de) * 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Einspritzdüse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000206A1 (de) * 2009-01-14 2010-07-15 Robert Bosch Gmbh Kraftstoffinjektor für Brennkraftmaschinen
DE102010044088A1 (de) * 2010-11-18 2012-05-24 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
EP2568157A1 (de) * 2011-09-08 2013-03-13 Delphi Technologies Holding S.à.r.l. Einspritzdüse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018036966A1 (fr) * 2016-08-24 2018-03-01 Delphi Technologies Ip Limited Corps de buse d'injecteur de carburant

Also Published As

Publication number Publication date
WO2014206753A1 (fr) 2014-12-31

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