EP2918818A1 - Kraftstoffeinspritzdüse - Google Patents

Kraftstoffeinspritzdüse Download PDF

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Publication number
EP2918818A1
EP2918818A1 EP15156616.3A EP15156616A EP2918818A1 EP 2918818 A1 EP2918818 A1 EP 2918818A1 EP 15156616 A EP15156616 A EP 15156616A EP 2918818 A1 EP2918818 A1 EP 2918818A1
Authority
EP
European Patent Office
Prior art keywords
valve member
holes
outer valve
nozzle assembly
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.)
Withdrawn
Application number
EP15156616.3A
Other languages
English (en)
French (fr)
Inventor
Said Boutrif
Gavin Dober
Matthieu Goy
Didier Robart
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
Publication of EP2918818A1 publication Critical patent/EP2918818A1/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Withdrawn legal-status Critical Current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
    • F02M61/16—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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the present invention relates to a variable orifice nozzle provided with a twin valve member for a fuel injector.
  • Fuel injectors with variable orifice nozzle have a body provided with an upper set of spray holes controlled by an outer valve member, also named needle, and a lower set of spray holes controlled by an inner valve member coaxially arranged inside the outer valve member.
  • the outer and inner valve members form a twin needle slidably arranged in the body, and able to be displaced between and open position and a closed position.
  • the valve members have lower ends provided with valve seats and, when the valve members are in closed position, the valve seats cooperate with seating surfaces provided on the nozzle body prohibiting fuel injection through the spray holes.
  • the outer valve member is provided with an upper valve seat cooperating with an upper seating surface which is above the upper holes, and also with a middle valve seat cooperating with a middle seating surface that is just below the upper holes.
  • the sealing of these upper holes is often not totally achieved since when the outer valve member contacts the upper seating surface, the middle seat either remains at a small distance from the middle seating surface or is not pressed onto the middle seating surface with sufficient force so that undesirable leakage through said upper holes occurs.
  • the two valve seats of the outer valve member must be pressed in contact against their respective seating surfaces with a sufficient force so pressurized fuel is unable to leak below the valve member.
  • VON variable orifice nozzle
  • the VON has a body extending along a main axis toward a lower end where are arranged an upper set of spray holes and a lower set of spray holes.
  • the VON is further provided with an outer valve member slidably arranged in the body for controlling the opening and closing of the upper holes and, an inner valve member coaxially slidably arranged inside the outer valve member for controlling the opening and closing of the lower holes.
  • the outer and the inner valve members are able to be independently translated between a closed position prohibiting fuel spray and an open position enabling fuel spray and, the nozzle assembly is further provided with an expansion means enlarging the outer valve member when being in closed position so that, the outer valve member is firmly biased against the nozzle body preventing any leakage through the upper holes.
  • the expansion means comprises a large annular cavity arranged in the outer valve member, the cavity reducing the wall thickness of the extremity of the outer valve member in the area where said valve member cooperates with the a seating surface arranged just below the upper set of holes.
  • pressurized fuel is able to fill the cavity and to generate on said area having a reduced wall thickness a force elastically enlarging the size of said valve member.
  • the reduced wall thickness may be chosen smaller than 0.5 mm and preferably smaller than 0.3 mm.
  • the expansion means comprises a large annular cavity arranged in the outer valve member and, the cavity reduces the wall thickness of the extremity of the outer valve member in the area where said valve member cooperates with the middle valve seat.
  • pressurized fuel is able to fill the cavity generating on said outer valve member area having a reduced wall thickness a force augmenting elastically the size of said valve member.
  • the expansion means further comprises, in the outer valve member, a radial through hole arranged upstream the upper valve seat and, in the inner valve member, an annular groove in fluid communication with said hole and an axial fluid passage downwardly extending from said grove to said large annular cavity.
  • the invention extends to a fuel injector comprising a variable orifice nozzle assembly as set in the preceding paragraphs.
  • the VON 12 extends along a main axis A. It has a body 14 with a pointy lower extremity 15 and is provided with an inner axial bore 16.
  • an upper set of holes 18 and a lower set of holes 20 are arranged in the pointy extremity 15 in the pointy extremity 15 in the pointy extremity 15 arranged an upper set of holes 18 and a lower set of holes 20.
  • the upper holes 18 are above the lower holes 20 and, each of the holes 18, 20, extends through the wall of the body 14 from an entry 22, 24, arranged in the bore 16 to an exit 26, 28, arranged on the outer face of the body 14.
  • the entries 22 of the upper holes 18 are arranged along an upper virtual plan circle perpendicular to the main axis A and, similarly, the entries 24 of the lower holes are arranged along a lower virtual plan circle whose diameters are perpendicular to the main axis A.
  • the bore is provided with three seating surfaces 31, 33, 35 that are from top to bottom, a first "upper” seating surface 31 arranged just above the upper entries 22 and, a second "middle” seating surface 33 arranged just below the upper entries 22 and, a third "lower” seating surface 35 arranged just above the lower entries 24, both the middle 33 and the lower 35 seating surfaces being between the upper 22 and the lower entries 24.
  • an outer cylindrical valve member 36 In the large bore 16 is slidably guided an outer cylindrical valve member 36, itself provided with an axial cylindrical smaller bore 38 wherein is slidably guided an inner valve member 40.
  • the inner valve member 40 At its lower extremity, the inner valve member 40 has a full conical end 42 while, the outer valve member 36, because of the downward opening of the smaller bore 38, has a truncated conical end 44 extending between an upper circular edge 46 and a lower circular edge 48.
  • the two valve members 36, 40 have complementary shapes enabling to form a complete cone.
  • the outer valve member 36 is further provided with a fluid passage 50 that comprises at least one radial through hole 50 arranged above the upper circular edge 46.
  • the hole 50 creates a fluid communication through the wall of the outer valve member 36, between the large bore 16 of the body 14 and the smaller bore 38 of the outer valve member 36.
  • the outer valve member 36 is further provided with an inner circular cavity 52 arranged in the smaller bore 38 in the vicinity of lower edge 48. Because of the cavity 52, the most downward portion 54 of the outer valve member 36, the portion in the vicinity to the lower edge 48 is thinner, having a reduced wall thickness inferior to 0.5mm, and preferably inferior to 0.3mm.
  • Figure 2 presents an alternative embodiment where the cavity 52 is a conical groove forming a volume parallel to the conical end 44 of the outer valve member 36.
  • Other non-represented alternatives of shapes can be made.
  • the inner valve member 40 is provided on its external face with a complementary annular groove 56 from which downwardly extend a fluid passage 58 ending before reaching the lower valve seat 34.
  • the represented fluid passage 58 comprises two parallel flats provided at the surface of the inner valve member 40 but, alternatives of other types and other number such as one, or three or more, grooves or channels, straight, helicoid or other shapes are also possible.
  • the radial hole 50 arranged in the outer valve member 36, the annular groove 56, the fluid passage 58 and the cavity 52 are in fluid communication and therefore, fuel can flow from the large bore 16 into the cavity 52.
  • the outer and inner valve members 36, 40 can be independently piloted in translation to displace between a closed position PC, where the valve member is at its most downward position, and a fully open position PO (not represented) where the valve member is lifted to its most upward position.
  • the outer valve member 36 and the inner valve member 40 being able to be displaced independently from each other, although all configurations are not in use today, nothing prevents the outer 36 and inner 40 valve members to be simultaneously in closed position PC or simultaneously in open position PO or, the inner valve member to be in open position PO while the outer valve member is in closed position PC or, to the opposite, the inner valve member to be in closed position PC while the outer valve member is in open position PO.
  • pressurized fuel flows in the body of the injector 10, from an inlet to the injection holes 18, 20.
  • closed position PC of both valve members 36, 40 the upper valve seat 30 is firmly biased against the upper seating surface 31 and, the lower valve seat 34 is firmly biased against the lower seating surface 35.
  • Pressurized fuel fills the large bore 16 of the body 14, the through hole 50, the annular groove 56 of the inner valve member 20 and downwardly flows into the fluid passage 58 until filling the circular cavity 52.
  • the pressurized fuel present in the circular cavity 52 generates forces F perpendicular to the surfaces of the cavity 52 and, said forces applied on the thinner portion 54 of the wall of the outer valve member 36 elastically deform said thinner portion 54 firmly biasing the middle valve seat 32 onto the middle seating surface 33 and therefore, the upper holes 18 are well sealed prohibiting any fuel leakage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP15156616.3A 2014-03-10 2015-02-25 Kraftstoffeinspritzdüse Withdrawn EP2918818A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB1404131.3A GB201404131D0 (en) 2014-03-10 2014-03-10 Fuel injector

Publications (1)

Publication Number Publication Date
EP2918818A1 true EP2918818A1 (de) 2015-09-16

Family

ID=50554757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15156616.3A Withdrawn EP2918818A1 (de) 2014-03-10 2015-02-25 Kraftstoffeinspritzdüse

Country Status (2)

Country Link
EP (1) EP2918818A1 (de)
GB (1) GB201404131D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2554368B (en) * 2016-09-22 2020-06-03 Delphi Tech Ip Ltd Dual fuel injector nozzle with an anti-leakage feature

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003040543A1 (de) * 2001-11-09 2003-05-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für brennkraftmaschinen
DE102004055267A1 (de) * 2004-11-17 2006-05-18 Robert Bosch Gmbh Kraftstoffeinspitzvorrichtung
DE102004060151A1 (de) * 2004-12-14 2006-06-29 Siemens Ag Düsenbaugruppe und Ventil
EP1693562A1 (de) * 2005-01-19 2006-08-23 Delphi Technologies, Inc. Brennstoffeinspritzventil
DE102007000080A1 (de) * 2006-02-08 2007-08-30 Denso Corp., Kariya Kraftstoffeinspritzdüse, Kraftstoffeinspritzvorrichtung und Einspritzelement
JP2009275646A (ja) * 2008-05-16 2009-11-26 Denso Corp 燃料噴射ノズル

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003040543A1 (de) * 2001-11-09 2003-05-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für brennkraftmaschinen
DE102004055267A1 (de) * 2004-11-17 2006-05-18 Robert Bosch Gmbh Kraftstoffeinspitzvorrichtung
DE102004060151A1 (de) * 2004-12-14 2006-06-29 Siemens Ag Düsenbaugruppe und Ventil
EP1693562A1 (de) * 2005-01-19 2006-08-23 Delphi Technologies, Inc. Brennstoffeinspritzventil
DE102007000080A1 (de) * 2006-02-08 2007-08-30 Denso Corp., Kariya Kraftstoffeinspritzdüse, Kraftstoffeinspritzvorrichtung und Einspritzelement
JP2009275646A (ja) * 2008-05-16 2009-11-26 Denso Corp 燃料噴射ノズル

Also Published As

Publication number Publication date
GB201404131D0 (en) 2014-04-23

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