EP2199593A1 - Verfahren zur Herstellung des Dichtungssitzes mit Einspritzlöchern für eine Kraftstoffeinspritzdüse - Google Patents

Verfahren zur Herstellung des Dichtungssitzes mit Einspritzlöchern für eine Kraftstoffeinspritzdüse Download PDF

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Publication number
EP2199593A1
EP2199593A1 EP08425800A EP08425800A EP2199593A1 EP 2199593 A1 EP2199593 A1 EP 2199593A1 EP 08425800 A EP08425800 A EP 08425800A EP 08425800 A EP08425800 A EP 08425800A EP 2199593 A1 EP2199593 A1 EP 2199593A1
Authority
EP
European Patent Office
Prior art keywords
sealing seat
production method
injection holes
injection
injection hole
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.)
Granted
Application number
EP08425800A
Other languages
English (en)
French (fr)
Other versions
EP2199593B1 (de
Inventor
Pasquale Dragone
Michele Petrone
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli SpA
Magneti Marelli Powertrain SpA
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 Magneti Marelli SpA, Magneti Marelli Powertrain SpA filed Critical Magneti Marelli SpA
Priority to EP20080425800 priority Critical patent/EP2199593B1/de
Publication of EP2199593A1 publication Critical patent/EP2199593A1/de
Application granted granted Critical
Publication of EP2199593B1 publication Critical patent/EP2199593B1/de
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Anticipated expiration legal-status Critical

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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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the present invention relates to a method for producing the sealing seat with injection holes of a fuel injector.
  • a fuel injector for an internal-combustion engine comprises a cylindrical tubular supporting body having a central supply channel, which performs the function of supply channel for the fuel and terminates with an injection nozzle regulated by an injection valve controlled by an electromagnetic actuator.
  • Set within the supply channel is a shutter or "needle”, mechanically connected to the electromagnetic actuator to be displaced between a position of closing and a position of opening of the injection nozzle.
  • the shutter co-operates with a valve seat of a sealing seat, which closes the supply channel at the bottom and is provided with injection holes.
  • the process of production of the sealing seat of the injector envisages, in a first step, injection moulding in a common mould of a compound formed by plastic binders and powdered metal. Subsequently, after extraction from the mould, the sealing seat undergoes a thermal treatment in furnaces, in which, as a result of the very high temperatures that are reached, the plastic binders melt whilst the powdered metal is compacted to form a sintered metal.
  • the process of sintering of the metal consists in compacting and transforming materials reduced to powder in an indivisible compound that at this point of the process has the desired characteristics of hardness and strength for the sealing seat.
  • the injection holes or spot facings are made in the sealing seat using an electric-discharge machine (EDM), in which machining with removal of stock for creating the injection holes uses, as is known, the erosive capabilities of electrical discharges.
  • EDM electric-discharge machine
  • Aim of the present invention is to provide a method for the production of a sealing seat with injection holes of a fuel injector that does not present the drawbacks described above and in particular is easy and inexpensive to implement.
  • a fuel injector which has, at one end thereof, an injection nozzle 2 provided with injection holes 3 and is controlled for injecting fuel directly into a combustion chamber (not illustrated) of a cylinder (not illustrated).
  • the injector 1 comprises a supporting body 4 having a cylindrical tubular shape, which has a longitudinal axis 5 and defines a supply channel 6 for the fuel, which extends throughout the length of the supporting body 4 for supplying the fuel under pressure to the injection nozzle 2.
  • the supporting body 4 houses within it an electromagnetic actuator (not illustrated) for actuation of a shutter 7 or "needle”, which is designed to regulate the flow of fuel through the injection nozzle 2 and has a top end, which is integral with the electromagnetic actuator (not illustrated). In a position corresponding to a bottom end thereof, the supporting body 4 houses an injection valve 8, which, under the action of the electromagnetic actuator (not illustrated), regulates the flow of fuel that traverses the injection nozzle 2.
  • the shutter 7 is mobile along the axis 5 and a bottom end 9 thereof co-operates, in a closing position of the injection valve 8, with a valve seat 10 of a sealing seat 11.
  • the bottom portion 9 of the shutter 7 is housed within the supply channel 6 and terminates with an plugging head 12 having a substantially spherical shape, which is designed to engage the valve seat 9 in the closing position of the injection valve 8.
  • the sealing seat 11 is defined by a monolithic body having a bottom portion designed to close at the bottom in a sealed way the supply channel 6 for the fuel and a top tubular portion that functions as guide for the bottom portion 9 of the shutter 7.
  • the injection nozzle 2 is made immediately downstream of the injection valve 8 and is defined by the plurality of through injection holes 3, which are distributed about the longitudinal axis 5 and are made on an outer conical surface 13 of the bottom portion of the sealing seat 11.
  • the different pre-assembled groups are mounted with interposition of different seal rings that meet these needs and increase the strength of the injector 1.
  • the sealing seat 11 of the injector 1 constitutes one of the different units that are produced independently and assembled in the final stage of the process of production of the injector 1 and is obtained entirely with metal-injection-moulding (MIM) technology.
  • MIM metal-injection-moulding
  • starting powdered metal is mixed in defined percentages with a plastic binder in order to obtain a homogeneous compound, which is then machined in the subsequent steps of the process.
  • the first step of the MIM process consists in injection into a mould 14 (partially illustrated in Figure 3 ) of said mixture at controlled temperature and pressure.
  • the homogeneous starting compound i.e., metal and plastic binder
  • the homogeneous starting compound is heated up to fluidification in an injection press, injected at low pressure into the mould 14, which reproduces in negative the shape of the sealing seat 11, then left to cool off up to solidification, and finally extracted from the mould 14.
  • each injection hole 3 comprises an outer portion of larger diameter and an inner portion of smaller diameter, and the punches 15 are shaped for reproducing in negative only the outer portion of each injection hole 3.
  • the semi-finished sealing seat 11 obtained after the injection-moulding are oversized with respect to the nominal dimensions of the finished sealing seat 11 on account of the reduction of dimensions that takes place in the subsequent steps.
  • the sealing seats 11, in a second step of the process undergo a thermal process to obtain almost complete elimination of the plastic binder without any fractures or deformations of the sealing seat 11 itself.
  • the elimination of the binder is the operation performed for removing the plastic polymers from the powdered metal, and the method used is determined by the physical properties of the metal, by the requirements of the finished product, i.e., the sealing seat 11, and by the chemical composition.
  • the semifinished pieces coming off the injection press are inserted in furnaces for removal of the binder, which usually occurs by evaporation.
  • the process of production described above presents numerous advantages. In the first place, it enables maximum freedom of design in so far as by means of the injection of powdered metal it is possible to obtain sealing seats 11 of even very complex shapes, with particularly reduced dimensional tolerances and with highly automated production cycles. Furthermore, the process of production described above is particularly convenient in the presence of high production volumes and in general enables a sensible reduction of the production costs as a result of a reduction of the machining operations to which the sealing seat 11 must be subjected; said sealing seat 11, at the end of the machining cycle performed with MIM technology, is already finished and ready to be assembled without any further machining operations (or merely requires simple mechanical drilling).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20080425800 2008-12-17 2008-12-17 Verfahren zur Herstellung des Dichtungssitzes mit Einspritzlöchern für eine Kraftstoffeinspritzdüse Active EP2199593B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20080425800 EP2199593B1 (de) 2008-12-17 2008-12-17 Verfahren zur Herstellung des Dichtungssitzes mit Einspritzlöchern für eine Kraftstoffeinspritzdüse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080425800 EP2199593B1 (de) 2008-12-17 2008-12-17 Verfahren zur Herstellung des Dichtungssitzes mit Einspritzlöchern für eine Kraftstoffeinspritzdüse

Publications (2)

Publication Number Publication Date
EP2199593A1 true EP2199593A1 (de) 2010-06-23
EP2199593B1 EP2199593B1 (de) 2011-06-15

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ID=40635815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080425800 Active EP2199593B1 (de) 2008-12-17 2008-12-17 Verfahren zur Herstellung des Dichtungssitzes mit Einspritzlöchern für eine Kraftstoffeinspritzdüse

Country Status (1)

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EP (1) EP2199593B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA019822B1 (ru) * 2010-09-10 2014-06-30 БЁРДЖЕСС-НОРТОН ЭмЭфДжи. КО., ИНК. Зажим топливного инжектора и способ его формирования

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404021A1 (de) * 1994-02-09 1995-08-10 Bosch Gmbh Robert Düsenplatte, insbesondere für Einspritzventile und Verfahren zur Herstellung einer Düsenplatte
WO2001048371A1 (de) * 1999-12-28 2001-07-05 Robert Bosch Gmbh Verfahren zur herstellung eines ventilstücks für eine kraftstoff-einspritzvorrichtung
US20020008166A1 (en) * 1998-04-10 2002-01-24 Kanehiro Fukaya Fuel injection nozzle
DE102005036950A1 (de) * 2005-08-05 2007-02-08 Robert Bosch Gmbh Verfahren zur Herstellung eines metallischen Bauteils und metallisches Bauteil, insbesondere Ventilsitzbauteil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4404021A1 (de) * 1994-02-09 1995-08-10 Bosch Gmbh Robert Düsenplatte, insbesondere für Einspritzventile und Verfahren zur Herstellung einer Düsenplatte
US20020008166A1 (en) * 1998-04-10 2002-01-24 Kanehiro Fukaya Fuel injection nozzle
WO2001048371A1 (de) * 1999-12-28 2001-07-05 Robert Bosch Gmbh Verfahren zur herstellung eines ventilstücks für eine kraftstoff-einspritzvorrichtung
DE102005036950A1 (de) * 2005-08-05 2007-02-08 Robert Bosch Gmbh Verfahren zur Herstellung eines metallischen Bauteils und metallisches Bauteil, insbesondere Ventilsitzbauteil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA019822B1 (ru) * 2010-09-10 2014-06-30 БЁРДЖЕСС-НОРТОН ЭмЭфДжи. КО., ИНК. Зажим топливного инжектора и способ его формирования

Also Published As

Publication number Publication date
EP2199593B1 (de) 2011-06-15

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