WO2016206835A1 - Injecteur de carburant et procédé de montage d'un injecteur de carburant - Google Patents

Injecteur de carburant et procédé de montage d'un injecteur de carburant Download PDF

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Publication number
WO2016206835A1
WO2016206835A1 PCT/EP2016/059294 EP2016059294W WO2016206835A1 WO 2016206835 A1 WO2016206835 A1 WO 2016206835A1 EP 2016059294 W EP2016059294 W EP 2016059294W WO 2016206835 A1 WO2016206835 A1 WO 2016206835A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle body
region
fuel injector
shaft portion
throttle plate
Prior art date
Application number
PCT/EP2016/059294
Other languages
German (de)
English (en)
Inventor
Andreas Koeninger
Christian Maus
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP16718678.2A priority Critical patent/EP3314112A1/fr
Publication of WO2016206835A1 publication Critical patent/WO2016206835A1/fr

Links

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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit

Definitions

  • the invention relates to a fuel injector according to the preamble of
  • Claim 1 Furthermore, the invention relates to a method for mounting a fuel injector according to the invention.
  • a fuel injector according to the preamble of claim 1 is already known from practice. This serves in particular as part of a so-called common-rail injection system for injecting fuel into the combustion chamber of a self-igniting internal combustion engine. Modern injection systems usually have a system pressure of more than 2000 bar.
  • the fuel known from practice! The injector or its injector housing has a plurality of mutually cooperating components, which include, inter alia, on the side facing an injection port of the fuel injector a nozzle body in which at least one injection port is formed, and then in the axial direction thereafter comprise a throttle plate. In particular, through holes are formed in the throttle plate, which serve, inter alia, to supply a high-pressure space formed in the nozzle body with high-pressure fuel.
  • Throttle plate is due to the high system pressures described above required to apply a relatively high axial clamping force between the nozzle body and the throttle plate. This is done in practice by means of a
  • Nozzle clamping nut which applies the required axial forces via the nozzle body to the throttle plate via a corresponding tightening torque.
  • an internal thread is provided in the nozzle retaining nut, which cooperates with an external thread formed on the injector housing.
  • the passage openings formed in the throttle plate must be aligned in a specific rotational angle position with respect to the nozzle body or to components arranged on the side of the throttle plate which faces away from the nozzle body become. This is usually done by means of dowel pins which penetrate the addressed components in the axial direction and connect them together.
  • Union nut also a change in the angular position of the throttle plate despite relatively high, acting on the throttle plate of the nozzle body
  • the already known from practice fuel injector has in the region of its nozzle body on a shaft portion which is conical.
  • the conicity of the shank region is relatively small, in particular because this is done by machining the outer surface of the nozzle body and thus the nozzle body (in a cylindrical bore for forming a high-pressure chamber in the interior of the nozzle body) in the region of the smallest diameter has a reduced wall thickness , which is not desirable for the strength reasons mentioned above.
  • the serves Conicity on the known nozzle body in particular to facilitate the insertion of the nozzle body into a corresponding receiving bore of a cylinder head of the internal combustion engine.
  • the present invention seeks to further develop a fuel injector according to the preamble of claim 1 such that it is suitable for sufficiently high
  • Njektors in particular the throttle plate
  • a torque can be introduced via the conical shaft portion, which changes the angular position of the nozzle body to the throttle plate.
  • Conicity solely due to the weight of the nozzle body in the usually provided material pairings ensures that the required torque can be applied to the nozzle body via a correspondingly formed tool carrier having a receptacle with a conicity corresponding to the conicity of the shank region.
  • it allows the conical shaft portion, this not only to adjust the use correct rotational angle position between the nozzle body and the throttle plate or other components, but also to prevent the nozzle body by applying a corresponding axial force to rotate when the nut with the required torque on the
  • the technically meaningful (size) range of conicity is limited on the one hand by the fact that for the transmission of torque to the nozzle body, a certain minimum conicity is required, and on the other hand, the size of the taper to ensure self-locking is also limited upwards. For these reasons, it is proposed in a particularly preferred embodiment of the fuel injector that the conicity is less than 0.2.
  • Axial direction extending or arranged dowel pins for angular positioning of the components provided in the fuel injector In order to maximize the cross section provided for achieving high strength values, it is therefore provided in a further embodiment of the invention that the connection region between the throttle plate and the nozzle body is formed free of rotation locking elements. Such a design not only increases the available cross-section of the relevant components, but also simplifies the assembly insofar as that neither corresponding manufacturing steps for generating openings for the dowel pins are required, nor steps for mounting the dowel pins.
  • provision may be made for a second shank region adjoining the conical shank region in the axial direction on the side facing away from the at least one injection opening to have an enlarged diameter relative to the conical shank region.
  • the second shaft region is cone-shaped. This makes it possible that, in addition to the shaft region and the second shaft region either for rotational position correct positioning of the nozzle body to
  • Throttle plate or to apply the required axial holding force in the direction of the throttle plate during assembly of the nut can be used.
  • the conicity of the two shaft regions is identical.
  • a particularly simple production of the two shank areas is achieved, which can be ground simultaneously, for example, with a corresponding tool.
  • the second shaft region As an alternative to a conical design of the second shaft region, it is also conceivable to form the second shaft region in a cylindrical manner. As a result, if necessary, a simplified production can be achieved with respect to a conical design of the second shank region. Particularly preferred is the inventive design of the
  • Shank area for fuel injectors operating at operating pressure or system pressure greater than 2000bar The invention also includes a method for assembling a so far
  • the inventive method provides that, at least for positioning the nozzle body to the throttle plate, the nozzle body is brought into operative connection with a tool carrier having a conical recess.
  • Nozzle body takes place on the side facing away from the union nut by means different from the tool carrier device.
  • End face particularly high axial forces can be transmitted to the nozzle body.
  • a particularly preferred method provides that after positioning the nozzle body to the throttle plate in a first
  • Fig. 1 is a partial longitudinal section through a fuel according to the invention! Njektor in the assembled state using a union nut and
  • Fig. 5 respectively in side view differently configured nozzle body as part of a fuel injector according to the invention.
  • Fuel injector 10 serves in particular as part of a so-called common-rail injection system for injecting fuel into the combustion chamber, not shown, of a self-igniting internal combustion engine.
  • the system pressure is preferably more than 2000bar.
  • the injector 10 comprises an injector housing, generally designated by the reference numeral 11. On the side facing the combustion chamber, the fuel injector 10 has a nozzle body 12. The particular in the
  • nozzle body 12 Essentially rotationally symmetrical to a longitudinal axis 13 formed nozzle body 12 is made of steel and has on the combustion chamber
  • the releasing or closing of the at least one injection opening 15 in the nozzle body 12 takes place in a known manner, and therefore not shown manner by a lifting movement of a arranged in the interior of the injector 1 1 nozzle needle, for example by means of a Magnetaktuators or by means of a piezoelectric actuator is pressed.
  • the nozzle body 12 forms in its interior a high-pressure space 17 only partially shown in which the system pressure prevails, and in which the addressed
  • Nozzle needle is arranged.
  • the through hole 21 is aligned by way of example in alignment with a supply bore 22, which by further components of
  • Injector 1 1 passed through or is formed in this, and which is connected to a fuel port, not shown.
  • Nozzle clamping nut in the form of a union nut 25 is provided.
  • Union nut 25 has on an inner side by way of example a thread, not shown, which cooperates with a formed on a component of the injector 1 1 counter thread to the assembly of the
  • the nozzle body 12 has a contact area 26 extending perpendicularly to the longitudinal axis 13.
  • the abutment region 26 cooperates with an end face 27 on the cap nut 25, which is connected to a in the
  • Diameter reduced area of the union nut 25 is formed on an inner side of the union nut 25.
  • a nozzle body 12 described so far is already known from the prior art.
  • the nozzle body 12 which can be seen in FIGS. 1 and 2, the latter has, starting from the dome 14, a transition section 16 which merges into a first cylindrical area 28.
  • the first region 28 may also be slightly conical, ie non-cylindrical, the conicity being less than 0.01 in this case, and the conicity being the difference in diameter of the first region 28, calculated or divided by its axial length.
  • a first conical shaft portion 31 connects.
  • the diameter of the first conical shaft portion 31 is larger than the diameter of the first cylindrical portion 28 and smaller than the diameter of the second cylindrical portion 33. Further, the first conical
  • the first shaft portion 31 has viewed in the direction of the longitudinal axis 13 has an axial length L.
  • the first shaft region 31 On the side facing the second cylindrical region 33, the first shaft region 31 has a (outer) diameter D-1 and a diameter D 2 on the side facing the tip 14.
  • the diameter D- 1 is greater than the diameter D 2 ,
  • the conicity C of the first shaft portion 31 is uniform over the entire length L of the first shaft portion 31 and according to the invention is between 0.01 and 0.4, preferably less than 0.2, the conicity C is formed as a quotient of the difference of Diameter DD 2 , divided by the length L of the first shaft portion 31.
  • the first shaft region 31a reaches at least almost, ie without an intermediate section 36, as far as the second cylindrical region 33.
  • the length L of the first shaft portion 31 a compared to the length L of the first shaft portion 31 is formed enlarged.
  • the diameters Di and D 2 may be different from those of the first shaft portion 31.
  • the area 28 may be either cylindrical or slightly conical (corresponding to the embodiments of FIG. 2).
  • the nozzle body 12b according to FIG. 4 has, starting from the top 14, a first shank region 31b, to which an in diameter
  • the second shaft portion 32 may be either cylindrical, or conical. In the latter case, the taper of the second shaft portion 32 is preferably the same size as the taper of the first shaft portion 31 b.
  • the second shaft portion 32 is connected to the cylindrical portion 33 via an intermediate portion 36 provided with a radius r.
  • cylindrical region 33 extends.
  • a tool carrier 100 shown in detail in FIG. 1 for the case of the nozzle body 12 serves as a tapered receiving opening 101 for receiving the first shaft portion 31, 31a to 31c.
  • the conicity of the receiving opening 101 corresponds to the taper C of the first shaft portion 31, 31 b to 31 c.
  • the rotational angular position of the nozzle body 12, 12a to 12c can be adjusted to the throttle plate 20 during assembly of the fuel injector 10, wherein the nozzle body 12, 12a to 12c alone by its weight in conjunction with the taper C of the first conical shaft portion 31, 31 a to 31 c and the conicity of the receiving opening 101 forms a frictional connection, which is sufficient for the transmission of the torque required to rotate the nozzle body 12, 12 a to 12 c.
  • Tool carrier 100 separate device 102 shown, which also to Application of the axial force A is used, wherein the device 102 acts on the end face of the fuel injector 10 in the region of the transition section 16.
  • the fuel injector 10 described so far can be modified or modified in many ways, without departing from the spirit of the invention.
  • Shank portion 31, 31 a to 31 c is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant (10), comprenant un corps de buse (12 ; 12a à 12c) qui est serré dans le sens axial contre une plaque d'étranglement (20) au moyen d'un écrou de serrage de buse (25). Le corps de buse (12 ; 12a à 12c) possède au moins une première zone de tige (31 ; 31a à 31c) réalisée de forme conique. Selon l'invention, la conicité C de la première zone de tige (31 ; 31a à 31c) est comprise entre 0,01 et 0,4.
PCT/EP2016/059294 2015-06-25 2016-04-26 Injecteur de carburant et procédé de montage d'un injecteur de carburant WO2016206835A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16718678.2A EP3314112A1 (fr) 2015-06-25 2016-04-26 Injecteur de carburant et procédé de montage d'un injecteur de carburant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015211780.4A DE102015211780A1 (de) 2015-06-25 2015-06-25 Kraftstoffinjektor und Verfahren zur Montage eines Kraftstoffinjektors
DE102015211780.4 2015-06-25

Publications (1)

Publication Number Publication Date
WO2016206835A1 true WO2016206835A1 (fr) 2016-12-29

Family

ID=55809126

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/059294 WO2016206835A1 (fr) 2015-06-25 2016-04-26 Injecteur de carburant et procédé de montage d'un injecteur de carburant

Country Status (3)

Country Link
EP (1) EP3314112A1 (fr)
DE (1) DE102015211780A1 (fr)
WO (1) WO2016206835A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020209636A1 (de) * 2020-07-30 2022-02-03 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Montage eines Kraftstoffinjektors und Werkzeug zur Verwendung in diesem Verfahren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1260459A (fr) * 1960-06-22 1961-05-05 Oesterr Saurerwerke Ag Injecteur pour moteurs à combustion interne
EP0097429A1 (fr) * 1982-06-18 1984-01-04 Caterpillar Inc. Injecteur-pompe combiné à un combustible
WO1996004476A1 (fr) * 1994-07-29 1996-02-15 Caterpillar Inc. Dispositif d'etancheite par rapport aux gaz de combustion destine a un injecteur de carburant
FR2875862A1 (fr) * 2004-09-24 2006-03-31 Renault Sas Moteur thermique comportant une culasse munie d'un tube porte-injecteur frette
EP2799705A1 (fr) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Ensemble d'injecteur de carburant et insert de manchon

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1260459A (fr) * 1960-06-22 1961-05-05 Oesterr Saurerwerke Ag Injecteur pour moteurs à combustion interne
EP0097429A1 (fr) * 1982-06-18 1984-01-04 Caterpillar Inc. Injecteur-pompe combiné à un combustible
WO1996004476A1 (fr) * 1994-07-29 1996-02-15 Caterpillar Inc. Dispositif d'etancheite par rapport aux gaz de combustion destine a un injecteur de carburant
FR2875862A1 (fr) * 2004-09-24 2006-03-31 Renault Sas Moteur thermique comportant une culasse munie d'un tube porte-injecteur frette
EP2799705A1 (fr) * 2013-05-01 2014-11-05 Delphi International Operations Luxembourg S.à r.l. Ensemble d'injecteur de carburant et insert de manchon

Also Published As

Publication number Publication date
DE102015211780A1 (de) 2016-12-29
EP3314112A1 (fr) 2018-05-02

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