EP1496246A1 - Buse d'injection - Google Patents

Buse d'injection Download PDF

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Publication number
EP1496246A1
EP1496246A1 EP04251360A EP04251360A EP1496246A1 EP 1496246 A1 EP1496246 A1 EP 1496246A1 EP 04251360 A EP04251360 A EP 04251360A EP 04251360 A EP04251360 A EP 04251360A EP 1496246 A1 EP1496246 A1 EP 1496246A1
Authority
EP
European Patent Office
Prior art keywords
injection nozzle
valve needle
annular groove
seating
fuel
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.)
Ceased
Application number
EP04251360A
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German (de)
English (en)
Inventor
Malcolm David Dick Lambert
Detlev Schoeppe
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 Operations Luxembourg SARL
Original Assignee
Delphi Technologies Inc
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 Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP04251360A priority Critical patent/EP1496246A1/fr
Publication of EP1496246A1 publication Critical patent/EP1496246A1/fr
Ceased 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M61/042—The valves being provided with fuel passages

Definitions

  • the invention relates to an injection nozzle for use in a fuel injection system for an internal combustion engine. It relates particularly, but not exclusively, to an injection nozzle for use in a compression ignition internal combustion engine, in which a valve needle is engageable with a seating surface to control the injection of fuel to an associated combustion space through one or more nozzle outlets.
  • a valve needle 10 has a seating surface 28, or seating "line", which engages with a seat 12 defined by a nozzle body bore 14 within which the valve needle 10 moves.
  • injection nozzle outlets 16 are opened to enable high pressure fuel to be injected into the associated engine cylinder (not shown).
  • the outlets 16 are closed and injection is terminated.
  • valve needle 10 Immediately downstream of its seating line 28, the valve needle 10 includes a downstream region 18 of frusto-conical form defining a first cone angle which typically is around 60 degrees.
  • the nozzle body bore 14 is of conical form, and defines a second cone angle.
  • the valve needle 10 includes an upstream region 20 of frusto-conical form.
  • the upstream region 20 defines a third cone angle, that typically is around 45 degrees.
  • the effective diameter of the seating line 28 varies with wear during nozzle service life.
  • the effective seat diameter influences fuel delivery pressure, or nozzle opening pressure (i.e. that pressure at which the valve needle is caused to lift from the seat 12 of the bore 14), and this affects the quantity of fuel that is delivered during injection (i.e. when the valve needle is lifted).
  • a nozzle of the type shown in Figure 1 has the effect of reducing variations in the effective seat diameter with nozzle wear. It has also been found that the variation of the effective seat diameter is reduced for significant periods of operation, and it is an advantage of this that delivery quantity variations are also reduced.
  • This injection nozzle also has an annular groove formed in the valve needle, and further includes flow guiding wall portions formed on an elevation in the bottom of the blind bore in which the valve needle is disposed. However, the flow guiding wall portions are provided for the purpose of reducing the formation of so-called dead-water areas in the blind bore.
  • an injection nozzle for an internal combustion engine comprising: a nozzle body provided with a blind bore within which a valve needle is moveable, the valve needle being engageable with a seating surface to control fuel flow between a supply chamber and at least one injection nozzle outlet, the valve needle being provided with an annular groove having an upstream edge defining an upper valve seating line and a downstream edge wherein, following wear in use, the lower edge becomes a lower valve seating line and the upper valve seating line and the lower valve seating line define an annular groove volume therebetween, and wherein a surface of the bore and the outer surface of the valve needle define a first flow path through which fuel flows from the supply chamber to the outlet(s) when the valve needle is lifted from the seating surface, the nozzle further including an additional flow path for said flow such that when, in use, the upper valve seating line and the lower valve seating line are in engagement with the seating surface, fuel is permitted to flow from the annular groove volume to the at least one injection nozzle outlet via the additional flow path.
  • the additional flow path comprises at least one groove defined in a surface of the bore in the nozzle body.
  • the at least one groove is substantially elongate in form.
  • the at least one groove is preferably shaped and dimensioned such that when, in use, the upper valve seating line and the lower valve seating line are in engagement with the seating surface, the annular groove volume is in fluid communication with the sac volume.
  • the width of the at least one groove is substantially constant along its length, e.g. approximately 30 microns width. A small width ensures that the amount of fuel injected during an injection event is not appreciably increased due to the effectively increased volume of the sac volume.
  • the at least one groove may taper in an upstream direction to improve flow efficiency.
  • the at least one groove may be shaped and dimensioned such that when, in use, the upper and lower valve seating lines are in engagement with the seating surface, the annular groove volume is in fluid communication with at least one injection nozzle outlet.
  • the width of the at least one groove at its downstream end is approximately the same as the diameter of the at least one injection nozzle outlet.
  • the depth of the at least one groove is approximately 30 microns.
  • the seating surface is of frusto-conical form with a constant cone angle
  • the valve needle further comprises a conical upstream section disposed upstream of the annular groove and a conical downstream section disposed downstream of the annular groove, the downstream section having a cone angle which is greater than that of the seating surface and the upstream section having a cone angle less than that of the seating surface.
  • the additional flow path comprises a fuel passageway formed in the valve needle itself.
  • the fuel passageway may comprise at least one inclined, or diagonal, bore extending from the annular groove of the valve needle through the downstream section of the valve needle to open at a surface thereof.
  • the fuel passageway may comprise at least one substantially radial bore extending between oppositely facing locations of the annular groove of the valve needle, the at least one substantially radial bore being in fluid communication with a plurality of further bores which open at a surface of the valve needle.
  • the outlet ends of the plurality of further bores are preferably defined in the downstream section of the valve needle, and may communicate with a sac volume or one or more injection nozzle outlets.
  • the axial bore(s) may be offset from the main longitudinal axis of the valve needle thereby defining a shorter bore which is easier to manufacture.
  • the injection nozzle may comprise a fuel passageway formed in the valve needle itself in combination with at least one groove defined in the surface of the bore formed in the nozzle body.
  • the bore (or bores) which form the fuel passageway may be formed using a laser, electro-discharge machining or spark erosion, or by any other suitable method.
  • the aforementioned bores are substantially circular in cross-section, and may have a diameter of approximately 0.03 to 0.2 mm.
  • the size and the shape of the bores may vary according to the application.
  • the part of the valve needle downstream of the upper valve seating line is adapted to occupy a significant proportion of the part of the bore downstream of the upper valve seating line.
  • FIG. 2a a fuel injection nozzle 8 as described in US 5,890,660.
  • the fuel injection nozzle 8 comprises a nozzle body 9 of stepped cylindrical form and, within the body 9 and extending from the wider end thereof, there is formed a blind bore 14. At the blind end of the bore 14 there is formed a seating surface 12 defined by the internal surface of the bore. Intermediate the ends of the bore 14 there is formed an enlargement 12a which communicates with a fuel inlet passage 13.
  • the fuel inlet passage 13 extends through a distance piece 26 and a nozzle holder 15 to a fuel inlet which in use is connected to a source of high pressure fuel (e.g. a common rail).
  • a source of high pressure fuel e.g. a common rail
  • the nozzle body 9 is secured to the nozzle holder 15 by means of the usual cap nut 17 and, in use, the narrower portion of the nozzle body passes through a bore into a combustion space of the associated engine (not shown).
  • valve needle 10 Slidable within the bore 14 is a valve needle 10.
  • the valve needle 10 intermediate the enlargement 12a and the seating surface 12 is of reduced diameter so as to define an annular supply chamber 29 through which fuel can flow when the valve needle 10 is in the open position.
  • the valve needle 10 is provided with an extension 20 which extends with a clearance through an aperture in the distance piece 26.
  • the extension 20 is engaged by a spring abutment 31 against which is located one end of a coiled compression spring 32, the other end of which bears against an abutment 33.
  • the spring 32 acts to maintain the valve needle 10 engaged with the seating surface 12 in the closed position, and the chamber in which the spring 32 is located is connected to a drain (not shown) through a passage 35.
  • the valve needle 10 includes four distinct regions.
  • a first region 21 at the uppermost end of the valve needle 10 is of substantially cylindrical form.
  • a second region 20 of frusto-conical or part conical form is arranged immediately downstream of the first region 21 and defines, or includes, at its lowermost edge, an upper seating line 28a having a diameter D.
  • the upstream region 20 has an included angle with the seating surface 12 of 0.75 degrees in this example, so that its cone angle is slightly less than that of the seating surface.
  • a third region 24 of the valve needle 10 is provided with an annular groove 24 in its outer surface.
  • the downstream edge 28b of the annular groove 24 forms a boundary with a downstream fourth region 19, which has a cone angle slightly greater than that of the seating surface 12.
  • the fourth region 19 terminates in a chamfered tip 22 which extends into a sac volume 34 defined at the blind end of the nozzle body bore 14.
  • the nozzle body 9 is provided with a set of first and second nozzle outlets 16 which provide a flow path for fuel into the combustion chamber (not shown) from the sac volume 34.
  • the sac volume 34 is defined by the seating surface 12 and an outer surface of the valve needle 10 in a region downstream of the lower edge 28b of the annular groove 24.
  • the seating line 28a is engageable with the seating surface 12 to control fuel flow into the sac volume 34 from the upstream supply chamber 29.
  • the valve needle 10 seats against the upper valve seating line 28a when in the non-injecting (i.e. closed) state, and may also seat against the lower edge 28b as the valve needle 10 becomes worn.
  • the lower edge 28b defines a lower seating line 28b and an annular groove volume 38 will be defined by the outer surface of the annular groove 24 of the valve needle 10 and the inner surface of the nozzle body bore 14.
  • fuel which becomes trapped in this annular groove volume 38 upon closing of the injection nozzle may cause premature injection due to an increased hydraulic opening force being applied to the needle 10.
  • Figure 3a shows an injection nozzle 8 of a first embodiment of the invention, which provides improved performance compared with the injection nozzle illustrated in Figures 2a and 2b.
  • FIG 3a similar parts to those shown in Figure 2b are denoted with like reference numerals.
  • the nozzle 8 illustrated in Figure 3a includes a valve needle 10 that is slidable within a bore 14 defined in a nozzle body 9, and engageable with a seating surface 12 provided by the bore 14.
  • the valve needle 10 also comprises at least four distinct regions: a first region 21, a second region 20, a third region provided with an annular groove 24, and a valve tip region 19, as previously described and illustrated in Figure 2b.
  • the annular groove 24 together with the region of the bore 14 between the upper and lower seats 28a and 28b defines an annular groove volume 38.
  • valve needle 10 of the present invention there is, however, defined a fuel passageway 36 (illustrated by the dashed line) for permitting trapped fuel to flow directly from the annular groove volume 38 to the sac volume 34 upon closure of the injection nozzle 8 so that premature injection does not occur.
  • the fuel passageway 36 comprises a first substantially radial bore 40 which is in fluid communication with a second substantially axial bore 42 which (in this particular example) lies in parallel to the main longitudinal axis of the valve needle 10.
  • the radial bore 40 is formed in that region of the valve needle which is provided with the annular groove 24, so that the first and second inlet ends 44a, 44b on the bore 44 open at the surface of the needle in the annular groove volume 38.
  • the first 44a and second 44b inlet ends are located diametrically opposite one another, as shown in Figure 3b.
  • a central portion of the radial bore 40 is fluidly connected to an inlet end 46a of the axial bore 42.
  • an outlet end 46b of the axial bore 42 opens from the chamfered tip 22 of the valve needle 10 into the sac volume 34 located at the downstream end of the bore 14.
  • Fuel in the supply chamber 29 may become trapped in the annular groove volume 38 after an injection event, but is able to flow through the fuel passageway 36 through the radial bore 40 into axial bore 42 and, hence into the sac volume 34. Due to the clearance between the outer surface of the valve tip region 19 and the bore 14, fuel in the sac volume can escape to the nozzle outlets 16, thus providing relief of pressure in the annular groove volume 38.
  • FIG 4 An alternative embodiment of the invention is shown in Figure 4, in which similar parts to the injection nozzle 8 of Figure 3 have like reference numerals.
  • the injection nozzle 8 of this embodiment is identical to the previous embodiment, except that the fuel passageway 36 in this embodiment comprises a single bore 42 which extends diagonally through the valve needle 10.
  • the diagonal bore 42 in this case has a single inlet end 46a which opens into the annular groove volume 38, and a single outlet end 46b which opens at the surface of the tapered region 19 of the valve needle 10 just upstream of the sac volume 34.
  • Fuel in the supply chamber 29 may become trapped in the annular groove volume 38 after an injection event, but is able to flow through the diagonal bore 42 and hence into the sac volume 34. Due to the clearance between the outer surface of the valve tip region 19 and the bore 14, fuel in the sac volume 34 can escape to the nozzle outlets 16, thus providing relief of pressure in the annular groove volume 38.
  • FIG. 5a A third embodiment of the present invention is illustrated in Figures 5a and 5b, in which similar parts of the injection nozzle 8 of the previously described embodiments have like reference numerals.
  • a fuel injection nozzle 8 comprising a valve needle 10 that is slidable within a bore 14 provided in the nozzle body 9.
  • the valve needle 10 also comprises four distinct regions: a first region 21, a second frusto-conical region 20, a third region having an annular groove 24, and a tapered valve tip region 19, as previously described and illustrated in Figures 2 to 4.
  • valve needle 10 in a worn state is engageable with both the upper seating line 28a and the lower seating line 28b, such that an annular groove volume 38 is defined by the outer surface of the annular groove 24 of the valve needle 10 and the surface 50 of the nozzle body bore 14.
  • a fuel passageway 36 for permitting trapped fuel to flow from the annular groove volume 38 to the sac volume 34 is formed by one or more elongated grooves 48 which are defined in the bore 14 of the nozzle body 9 itself, rather than in the valve needle 10 as in the previously described embodiments. These grooves 48 can be seen more clearly in Figure 5b.
  • the grooves 48 are defined at the lower tapered end of the nozzle body bore 14, immediately upstream of the sac volume 34.
  • the grooves 48 are positioned so as to extend from a region of the bore 14 which is adjacent to the annular groove volume 38 in the needle 10.
  • the grooves 48 When the valve needle 10 is in its lowermost (i.e. non-injecting) position, the grooves 48 extend to a region of the bore 14 just downstream of the outlets 16.
  • the grooves 48 should not extend above the upper seating line 28a otherwise fuel would be able to flow from the supply chamber 29 and then to the injection nozzle outlets 16 when the valve needle is in its injecting position, thereby causing premature initiation of the following injection event.
  • the grooves 48 are tapered in the upstream direction to improve flow efficiency (i.e.
  • each of the grooves 48 may be substantially the same as the diameter, D, of the injection nozzle outlets 16.
  • the depth, d, of a groove 48 is illustrated in Figure 5c, and may be approximately 30 microns.
  • Figures 6a and 6b show a fourth embodiment of the present invention in which the elongated grooves 48 are formed in a different position in the inner surface 50 of the nozzle body 9 to those of the third embodiment.
  • FIGs 6a and 6b similar parts to those shown in Figures 5a and 5b are noted with like reference numerals.
  • the elongated grooves 48 extend from the annular groove 24 of the valve needle 10 to the sac volume 34, when the valve needle is in its seated position in the bore 14. This is more clearly illustrated in Figure 6b where a number of grooves 48 are shown alternately positioned between the nozzle outlets 16 formed in the nozzle body 9. As in the previously described embodiment, the grooves 48 define a fuel passageway 36 for permitting trapped fuel to escape from the annular groove volume 38 so that premature injection does not occur.
  • the grooves 48 should not extend above the upper seating line 28a otherwise fuel would be able to flow from the delivery chamber 29 and into the sac volume 34 when the valve needle 10 is in its injecting position, thereby causing premature initiation of the following injection event.
  • the fuel passageway may comprise any suitable number of bores.
  • two radial bores in fluid communication with a single axial bore, or two (or more) diagonal bores could be provided.
  • at least one radial bore could be provided, with multiple axial or offset bores.
  • any number of grooves may be formed in the surface of the bore formed in the nozzle body.
  • the injection nozzle may also comprise a fuel passageway formed in the valve needle itself (the fuel passageway comprising any number of bores) in combination with one or more grooves defined in the surface of the bore formed in the nozzle body.
  • the present invention is not limited to implementation in an injection nozzle having a valve covered orifice (VCO) with a sac volume, such as those shown in Figures 3 to 6, but may also be implemented in a sac-type injection nozzle in which there is a sac volume communicating directly with inlet ends of the nozzle outlets.
  • VCO valve covered orifice
  • the sac volume 34 is absent, and the provision of the grooves 48, such as those shown in Figure 5a, serves to improve flow efficiency and thus provides an additional benefit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP04251360A 2003-07-07 2004-03-10 Buse d'injection Ceased EP1496246A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04251360A EP1496246A1 (fr) 2003-07-07 2004-03-10 Buse d'injection

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03254291 2003-07-07
EP03254291 2003-07-07
EP04251360A EP1496246A1 (fr) 2003-07-07 2004-03-10 Buse d'injection

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EP1496246A1 true EP1496246A1 (fr) 2005-01-12

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EP04251360A Ceased EP1496246A1 (fr) 2003-07-07 2004-03-10 Buse d'injection

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EP (1) EP1496246A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011160991A1 (fr) * 2010-06-22 2011-12-29 Robert Bosch Gmbh Injecteur, en particulier injecteur pour rampe commune, et système d'injection de carburant présentant un injecteur
EP3309386A1 (fr) * 2016-10-14 2018-04-18 Delphi International Operations Luxembourg S.à r.l. Membre de vanne d'un injecteur de carburant

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158151A (en) * 1984-04-26 1985-11-06 Lucas Ind Plc Fuel injection nozzles
GB2186632A (en) 1986-02-18 1987-08-19 Bosch Gmbh Robert Fuel injection nozzle for i.c. engines
JPH10252605A (ja) * 1997-03-14 1998-09-22 Toyota Autom Loom Works Ltd ディーゼルエンジンの燃料噴射ノズル
US5890660A (en) 1994-12-20 1999-04-06 Lucas Industries Public Limited Company Fuel injection nozzle
US5947389A (en) * 1996-06-06 1999-09-07 Zexel Corporation Variable nozzle hole type fuel injection nozzle
US5950930A (en) * 1996-11-07 1999-09-14 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
JP2000265927A (ja) * 1999-03-16 2000-09-26 Toyota Motor Corp 燃料噴射ノズル
DE10020148A1 (de) * 1999-04-26 2000-11-16 Toyota Motor Co Ltd Kraftstoffeinspritzdüse
DE10109345A1 (de) * 2000-02-29 2001-08-30 Denso Corp Kraftstoffeinspritzeinrichtung für einen Verbrennungsmotor
US20020179743A1 (en) * 2000-06-27 2002-12-05 Rainer Haeberer Fuel injection valve for internal combustion engines
WO2004027254A1 (fr) * 2002-09-13 2004-04-01 Robert Bosch Gmbh Soupape d'injection de carburant pour moteur a combustion interne
WO2004031570A1 (fr) * 2002-09-27 2004-04-15 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
WO2004070197A1 (fr) * 2003-02-03 2004-08-19 Robert Bosch Gmbh Buse d'injection

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158151A (en) * 1984-04-26 1985-11-06 Lucas Ind Plc Fuel injection nozzles
GB2186632A (en) 1986-02-18 1987-08-19 Bosch Gmbh Robert Fuel injection nozzle for i.c. engines
US5890660A (en) 1994-12-20 1999-04-06 Lucas Industries Public Limited Company Fuel injection nozzle
US5947389A (en) * 1996-06-06 1999-09-07 Zexel Corporation Variable nozzle hole type fuel injection nozzle
US5950930A (en) * 1996-11-07 1999-09-14 Robert Bosch Gmbh Fuel injection valve for internal combustion engines
JPH10252605A (ja) * 1997-03-14 1998-09-22 Toyota Autom Loom Works Ltd ディーゼルエンジンの燃料噴射ノズル
JP2000265927A (ja) * 1999-03-16 2000-09-26 Toyota Motor Corp 燃料噴射ノズル
DE10020148A1 (de) * 1999-04-26 2000-11-16 Toyota Motor Co Ltd Kraftstoffeinspritzdüse
DE10109345A1 (de) * 2000-02-29 2001-08-30 Denso Corp Kraftstoffeinspritzeinrichtung für einen Verbrennungsmotor
US20020179743A1 (en) * 2000-06-27 2002-12-05 Rainer Haeberer Fuel injection valve for internal combustion engines
WO2004027254A1 (fr) * 2002-09-13 2004-04-01 Robert Bosch Gmbh Soupape d'injection de carburant pour moteur a combustion interne
WO2004031570A1 (fr) * 2002-09-27 2004-04-15 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
EP1546547A1 (fr) 2002-09-27 2005-06-29 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
WO2004070197A1 (fr) * 2003-02-03 2004-08-19 Robert Bosch Gmbh Buse d'injection

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 14 31 December 1998 (1998-12-31) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 12 3 January 2001 (2001-01-03) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011160991A1 (fr) * 2010-06-22 2011-12-29 Robert Bosch Gmbh Injecteur, en particulier injecteur pour rampe commune, et système d'injection de carburant présentant un injecteur
EP3309386A1 (fr) * 2016-10-14 2018-04-18 Delphi International Operations Luxembourg S.à r.l. Membre de vanne d'un injecteur de carburant
FR3057623A1 (fr) * 2016-10-14 2018-04-20 Delphi International Operations Luxembourg S.A R.L. Membre de vanne d'un injecteur de carburant

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