EP3279465A1 - Einspritzdüsenkörper - Google Patents

Einspritzdüsenkörper Download PDF

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Publication number
EP3279465A1
EP3279465A1 EP17181021.1A EP17181021A EP3279465A1 EP 3279465 A1 EP3279465 A1 EP 3279465A1 EP 17181021 A EP17181021 A EP 17181021A EP 3279465 A1 EP3279465 A1 EP 3279465A1
Authority
EP
European Patent Office
Prior art keywords
face
needle
female
bore
cylindrical
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Withdrawn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
EP17181021.1A
Other languages
English (en)
French (fr)
Inventor
Philippe Legrand
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 EP3279465A1 publication Critical patent/EP3279465A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M61/16—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
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188

Definitions

  • the invention relates to a fuel injector provided with a device for guiding the needle of the injector.
  • a fuel injector conventionally comprises a needle controlled opening and closing depending on the pressure in a control chamber.
  • the needle is slidable within a bore of the nozzle body, wherein one end of the needle is sealingly provided with a nozzle seat provided on an inner surface of the bore of the nozzle body, to control the supply of fuel through spray holes located through the wall of the nozzle body.
  • the fuel is at high pressure and flows into the injector from the inlet channel to the injection holes.
  • the end of the needle expands and thus the clearance increases between the low guide and the needle up to values of 15 micrometers.
  • the needle can then be more widely misaligned and as a result slippage increases as the needle comes into contact with the nozzle seat before the needle reaches its seat completely and the injection stops.
  • the effect of this sliding is greater wear and closure time varying with each injection.
  • the object of the present invention is to provide a solution that overcomes these disadvantages.
  • the present invention proposes to solve these problems by a device for guiding the needle of the injector.
  • the fuel injector includes a nozzle body adapted to cooperate with a slidably adjusting needle to form a nozzle assembly of a fuel injector.
  • the nozzle assembly extends along the longitudinal axis.
  • the nozzle body comprises a wall peripheral and longitudinal extending along the longitudinal axis defining a longitudinal cylindrical bore open at a first end and terminating in a conical face at a second opposite end defining a valve seat adapted to cooperate with a complementary face of the needle.
  • the conical tip of the valve seat opens into a bag from which there are injection holes passing through said peripheral wall.
  • the nozzle body further comprises a needle guiding means comprising a high guide and a low guide in which a female cylindrical face of the bore and a complementary male face of the needle cooperate.
  • the cylindrical female face is in direct continuity with the nozzle seat.
  • the female cylindrical face has a diameter smaller than the diameter of the bore so that the female face is connected to the bore in at least one connecting face.
  • a nozzle assembly comprises a nozzle body provided with a female guide face as previously described and a valve needle slidably arranged in the bore comprising the complementary guide male face.
  • the cylindrical male face of the needle includes fuel passage conduits extending along the longitudinal axis.
  • the fuel passage ducts of the male cylindrical face of the needle are flats.
  • the needle has a diameter of the male face substantially equal to the diameter of the female cylindrical guide face.
  • an injector comprises a nozzle assembly as described above.
  • top-down orientation is chosen arbitrarily and, words and phrases such as "above, below, above, below, up, down " can be used without any intention to limit the invention.
  • FIG 1 there is described an embodiment of the invention relating to a fuel injector 10, here a diesel injector although the invention is fully transposable to a gas injector or any other fuel.
  • a fuel injector 10 here a diesel injector
  • the invention is fully transposable to a gas injector or any other fuel.
  • the description will detail the elements of the invention and will remain more succinct and general as to the surrounding elements.
  • the injector 10 extends along a longitudinal axis X and comprises from bottom to top, in the conventional and non-limiting sense of the figures, a nozzle assembly 12 comprising a needle valve element 14 or commonly called needle 14 arranged in a body nozzle 16, a control valve assembly 18 arranged in a valve body 20, an actuator 22 arranged in an actuator body 24.
  • the needle 14 is arranged axially sliding in a longitudinal cylindrical bore 26 of the nozzle body between a closed position in which the needle 14 is in contact with a nozzle body seat 38 and an open position where the needle is spaced from the seat 38.
  • the injector 10 is provided with a fuel circulation circuit which makes it possible to supply high pressure fuel via a high-pressure circuit from an inlet orifice arranged in an upper part of the injector 10 to the d injection 28 arranged in a lower part of the injector 10.
  • the nozzle body 16 extends along a longitudinal axis X.
  • the figure 2 is an exaggerated representation of the nozzle assembly 12 where the needle 14 is shown remote from the seat 38 when in fact the needle 14 remains close to the seat 38.
  • the nozzle body 16 is provided to cooperate with the valve needle 14 according to a sliding fit so as to form a nozzle assembly 12 of a fuel injector.
  • the nozzle body 16 comprises a peripheral and longitudinal wall 46 extending along the longitudinal axis X and a guide means 48 of the needle comprising a high guide 49 and a low guide 50. In the low guide 50, as described in figure 2 , cooperate a female cylindrical face 52 of the bore and a male face 54 complementary to the needle.
  • the peripheral wall 46 defines a longitudinal cylindrical bore 26 open at a first end 58 and ending in point 59 in a conical face 56 at a second opposite end 60 defining a valve seat 38 adapted to cooperate with a complementary face 62 of the 'needle.
  • the conical face 56 and the face 62 of the needle seal.
  • the tapered tip 59 of the valve seat opens into a bag 64 from which the injection holes 28 extend through said peripheral wall 46.
  • the male face 54 of the needle is slidably fitted to the female face 52 of the bore. functional game near.
  • the female cylindrical face 52 is in direct continuity with the nozzle seat 38.
  • the female face 52 extends along the longitudinal axis X.
  • the female face 52 is in the extension of the seat of the nozzle 38.
  • the bore 26 extends axially towards the valve seat 38 in parallel with the female face 52 so as to form an annular recess 68 surrounding the female cylindrical face 52.
  • the female face 52 is connected to the recess 68 by a flat face 55.
  • the plane face 55 is perpendicular to the longitudinal axis X.
  • the face 55 may have other shapes, such as a beveled shape, a shape in bias or any other form.
  • the nozzle body 16 is provided with an annular cylindrical wall 53 between the recess 68 and the female cylindrical face 52.
  • the thickness of the wall 53 is of the order of 0.2 mm to 0.4 mm.
  • the recess 68 may be of various shapes such as a semicircular or planar shaped bottom or any other shape.
  • the nozzle body 16 is provided with an annular groove 70 which is arranged at the intersection of the seat 38 and the cylindrical female face 52 of the bore.
  • the annular groove 70 is disposed between the bore 26 and the female face 52 of low guide.
  • the cylindrical female face 52 has a diameter D52 smaller than the diameter D26 of the bore.
  • the nozzle assembly 12 comprises a nozzle body 16 provided with the female face 52 and the needle 14 which is slidably arranged in the bore 26.
  • the needle 14 comprises the male guide face 54 complementary to the female face 52 of the bore.
  • the male cylindrical face 54 of the needle comprises fuel passage conduits 72 extending along the longitudinal axis X.
  • the fuel passage ducts 72 of the male cylindrical face 54 of the needle are flats 72.
  • the number of flats is 8 of which 4 are visible on the figure 2 but other flats 72 may be added or removed.
  • the flats 72 can be made by a grinding method or any other method.
  • the fuel passage conduits 72 may be longitudinal grooves or any other form allowing the passage of fuel.
  • the annular groove 70 of the nozzle body serves to equalize the fuel pressure arriving from the different fuel lines 72 before it reaches the nozzle seat 38 and the bag 64.
  • the needle 14 has a diameter DE14 less than the guide diameter DE52 of the female cylindrical face 52. The difference between the guide diameter DE52 and the diameter DE14 of the needle corresponds to the functional clearance to effect the sliding.
  • the needle 14 does not have fuel passage conduits 72.
  • the wall 53 then comprises longitudinal openings, for example at least 3 openings. The realization of these openings may be carried out for example by an electrochemical machining process.
  • the female cylindrical face 52 is connected to the bore 26 in at least one connecting face, for example by the extension of the perpendicular face 55, the face 55 being able to be a radial face, or inclined.
  • this alternative there is no annular recess 68.
  • the actuator 22 when the actuator 22 is electrically powered, it attracts the magnetic armature 30 and the valve stem 32 which are secured together, thereby opening the evacuation channel (not shown) and allowing the fuel enclosed in the control chamber 34 to evacuate to a low pressure circuit (not shown). Then the pressure decreases in the chamber of control 34 and the needle 14 moves in the bore 26 of the nozzle body to an open position in which a lower end 36 of the needle moves away from the seat 38 of the nozzle body. As a result, an upper end 40 of the needle contacts a lower face 42 of the valve body.
  • the magnetic armature assembly 30 and control rod 32 is pushed by a valve spring 44 to a position which prevents the fuel from flowing to the evacuation channel which is closed. , which retains the high-pressure fuel that gets there. Then the pressure in the control chamber 34 rises and the needle 14 is pushed down by a needle spring 45 and the lower end 36 of the needle is in contact with the nozzle seat 38 and the end upper 40 of the needle is remote from the lower face 42 of the valve body.

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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)
EP17181021.1A 2016-08-01 2017-07-12 Einspritzdüsenkörper Withdrawn EP3279465A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1601178A FR3054614A1 (fr) 2016-08-01 2016-08-01 Corps de buse d'injecteur

Publications (1)

Publication Number Publication Date
EP3279465A1 true EP3279465A1 (de) 2018-02-07

Family

ID=57485547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17181021.1A Withdrawn EP3279465A1 (de) 2016-08-01 2017-07-12 Einspritzdüsenkörper

Country Status (2)

Country Link
EP (1) EP3279465A1 (de)
FR (1) FR3054614A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2625123A (en) * 2022-12-07 2024-06-12 Phinia Delphi Luxembourg Sarl Fuel injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195515A2 (de) * 2000-10-04 2002-04-10 Robert Bosch Gmbh Brennstoffeinspritzventil
WO2003067076A1 (de) * 2002-02-05 2003-08-14 Robert Bosch Gmbh Brennstoffeinspritzventil
US20110180635A1 (en) * 2010-01-25 2011-07-28 Continental Automotive Systems Us, Inc. High Pressure Fuel Injector Seat That Resists Distortion During Welding
EP2799706A1 (de) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Einspritzdüse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195515A2 (de) * 2000-10-04 2002-04-10 Robert Bosch Gmbh Brennstoffeinspritzventil
WO2003067076A1 (de) * 2002-02-05 2003-08-14 Robert Bosch Gmbh Brennstoffeinspritzventil
US20110180635A1 (en) * 2010-01-25 2011-07-28 Continental Automotive Systems Us, Inc. High Pressure Fuel Injector Seat That Resists Distortion During Welding
EP2799706A1 (de) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Einspritzdüse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2625123A (en) * 2022-12-07 2024-06-12 Phinia Delphi Luxembourg Sarl Fuel injector

Also Published As

Publication number Publication date
FR3054614A1 (fr) 2018-02-02

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