EP2592260A1 - Injecteur de carburant, procédé de montage d'un injecteur de carburant et dispositif de serrage pour le montage d'un injecteur de carburant - Google Patents

Injecteur de carburant, procédé de montage d'un injecteur de carburant et dispositif de serrage pour le montage d'un injecteur de carburant Download PDF

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Publication number
EP2592260A1
EP2592260A1 EP12186248.6A EP12186248A EP2592260A1 EP 2592260 A1 EP2592260 A1 EP 2592260A1 EP 12186248 A EP12186248 A EP 12186248A EP 2592260 A1 EP2592260 A1 EP 2592260A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nut
retaining
fuel injector
holding
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
EP12186248.6A
Other languages
German (de)
English (en)
Other versions
EP2592260B1 (fr
Inventor
Dietmar Uhlmann
Waldemar Kiel
Jens-Peter Nagel
Hrvoje Lalic
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.)
Robert Bosch GmbH
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
Publication of EP2592260A1 publication Critical patent/EP2592260A1/fr
Application granted granted Critical
Publication of EP2592260B1 publication Critical patent/EP2592260B1/fr
Active legal-status Critical Current
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
    • F02M61/04—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
    • 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
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2200/8053—Fuel injection apparatus manufacture, repair or assembly involving mechanical deformation of the apparatus or parts thereof
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

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 and a clamping device for use in the assembly of a fuel injector according to the invention.
  • a fuel injector according to the preamble of claim 1 is already known from practice. It is used to inject fuel into the combustion chamber of a particular self-igniting internal combustion engine.
  • the injector housing used in the known fuel injector consists of a nozzle body in which a nozzle needle is guided up and down movable. The nozzle body is clamped axially with the interposition of a throttle plate and a valve plate against a holding body of the fuel injector.
  • a nozzle retaining nut which is designed in the form of a union nut, and which abuts with a radially inwardly extending collar which acts as an axial stop against a formed on the nozzle body stage.
  • the nozzle retaining nut at its end facing away from the nozzle body on an internal thread which cooperates with a formed on the holding body external thread to secure the nozzle retaining nut on the holding body or can tense.
  • the invention has the object, a fuel injector according to the preamble of claim 1 such that even at relatively high operating pressures, meant here are operating pressures that are more than 1500bar, always a dense component network or a dense fuel injector is achieved, wherein during the manufacture of the fuel injector damage to the components or a rotation of the components to each other to be prevented.
  • This object is achieved in a fuel injector with the features of claim 1, characterized in that the nozzle retaining nut holding means for a clamping device for elastically extending the nozzle retaining nut in the longitudinal direction at least in a partial region between the collar (the nozzle retaining nut) and the threaded bore.
  • a nozzle retaining nut is used in which by clamping in a clamping device, an elastic extension in the longitudinal direction is made possible, so that within the nozzle retaining nut arranged components can then be connected to the holding body largely free of torque by the force applied to the nozzle retaining nut by the tensioning device is lifted after arranging the components in the nozzle retaining nut and the manufacture of the threaded connection between the nozzle retaining nut and the holding body.
  • the nozzle lock nut shortens after installation in their length, so that the mentioned dense bond between the components is achieved.
  • first and second holding elements are provided, wherein the two holding elements axially spaced from each other are arranged on the outside of the nozzle retaining nut.
  • the holding means can be particularly easy to bring into operative connection with a clamping device.
  • the at least one first retaining element be arranged in an end region of the nozzle retaining nut facing away from the threaded bore and the at least one second retaining element be arranged at an area, which is arranged on the end region of the threaded bore side facing a small distance from the threaded bore.
  • holding elements are designed as radially encircling retaining grooves.
  • Such retaining grooves are particularly easy to produce or produce on the nozzle retaining nut, in particular by grinding or embossing.
  • the first and / or second holding elements are more Have retaining grooves.
  • the tensile forces transmitted by the tensioning device to the nozzle retaining nut are introduced into the nozzle retaining nut via a plurality of retaining grooves and thus minimized.
  • the retaining grooves each have an axial stop surface.
  • the fuel injector in which the nozzle body and the holding body are axially braced against each other under the axial interposition of a throttle plate and a valve plate.
  • the nozzle retaining nut, the holding body and possibly the throttle plate and the valve plate are connected to each other in the axial direction without these in their angular position to each other positioning, in particular pin-shaped holding means. This makes it possible to minimize the size of the fuel injector in terms of its cross-sectional area. Also, by eliminating the additional components, the manufacturing costs of the fuel injector are reduced and possible errors in the assembly of the fuel injector by the additional components excluded.
  • the invention also includes a method for assembling a fuel injector according to the invention. It is provided that initially takes place a clamping a union nut in a clamping device in the region of the holding means. Subsequently, an axial expansion force is applied to the nozzle retaining nut for elastic extension of the nozzle retaining nut. Thereafter (or before the application of the stretching force), a nozzle body and possibly a throttle plate and a valve plate are introduced into the nozzle retaining nut. Subsequently, a screwing of a holding body with the nozzle retaining nut and finally a loosening of the connection between the clamping device and the nozzle lock nut in the region of the holding means.
  • the invention comprises a clamping device for use in a fuel injector according to the invention.
  • a clamping device for use in a fuel injector according to the invention.
  • at least two clamping elements which can be connected to the retaining means of the nozzle retaining nut are provided, wherein the axial spacing of the retaining means is mutually variable.
  • the tensioning device has at least two tensioning elements which can be connected at least indirectly to the retaining means of the nozzle tensioning nut, wherein the axial spacing of the retaining means can be changed relative to one another.
  • each of the clamping means consists of two cooperating half-shell elements which surround the nozzle lock nut at its periphery.
  • Fig. 1 is the a combustion chamber of an internal combustion engine, not shown, in particular a self-igniting internal combustion engine, facing end portion of a fuel injector 10 according to the invention or its injector 11 is shown.
  • the injector housing 11 comprises a nozzle body 12, in which a (not shown) nozzle needle is guided up and down movable. In the axial direction is followed by the nozzle body 12, a throttle plate 13 and a valve plate 14, to which in turn in the axial direction, a holding body 15 connects.
  • the respective mutually facing end faces or end faces of the nozzle body 12, the throttle plate 13, the valve plate 14 and the holding body 15 are axially braced against each other to produce a sealed injector housing 11.
  • a nozzle retaining nut 20 which has a radially inwardly projecting, circumferential collar 21 at its end portion associated with the nozzle body 12, which at one Paragraph 22 of the nozzle body 12 is applied, which thus forms an axial stop for the nozzle retaining nut 20 in the direction of the holding body 15.
  • the nozzle clamping nut 20 has at least on its inner side different diameter ranges, which are adapted to the respective outer diameter of the nozzle body 12, the throttle plate 13, the valve plate 14 and the holding body 15, such that the addressed components radially with minimal radial clearance of the nozzle lock nut 20 are.
  • the nozzle lock nut 20 On the holding body 15 facing end portion, the nozzle lock nut 20 on its inner wall a threaded bore 23 which cooperates with a corresponding external thread 24 which is formed on the valve plate 14 facing the end region of the holding body 15. About trained by the threaded bore 23 and the external thread 24 threaded connection 25 which is required to maintain the dense component network axial clamping force is transmitted to the components.
  • the holding means 30 comprise first holding elements 31 and axially spaced second holding elements 32.
  • the first holding elements 31 are formed on the outer wall or on the outer circumference of the nozzle retaining nut 20 on the holding body 15 facing away from the end region.
  • the first holding member 31 is formed as a radially encircling holding groove 33.
  • the retaining groove 33 has a (horizontal) abutment surface 35 which is arranged perpendicular to the longitudinal axis 34 of the nozzle retaining nut 20 and which merges via a short intermediate region 36 extending parallel to the longitudinal axis 34 into an obliquely or conically running transition surface 37.
  • the angle ⁇ of the transition surface 37 with respect to the longitudinal axis 34 is an example of about 20 ° at a radial width of the stop surface 35 of about 1 mm.
  • a plurality of spaced apart in the longitudinal direction of the nozzle retaining nut 20 first holding elements 31 and holding grooves 33, which then together form the first holding elements 31.
  • the second holding elements 32 include, in particular with reference to the Fig. 2 and 3 It can be seen, two spaced apart in the longitudinal direction of the nozzle retaining nut 20, in the exemplary embodiment identically formed retaining grooves 38.
  • the second holding elements 32 and the retaining grooves 38 are arranged in the longitudinal direction just below the height of the threaded bore 23 on the outer circumference of the nozzle retaining nut 20.
  • the retaining grooves 38 are in principle formed like the retaining groove 33.
  • each of the retaining grooves 38 has an abutment surface 39 extending perpendicularly to the longitudinal axis 34, an intermediate region 40 and an obliquely or conically arranged transition surface 41, wherein the angle ⁇ of the transition surface 41, relative to the longitudinal axis 34, is identical to the angle ⁇ is formed, that is also about 20 °. It is essential that the inclination of the transition surfaces 37, 41 is aligned in different directions, so that the abutment surface 35 and the two abutment surfaces 39 can serve to secure the region of the nozzle retaining nut 20 arranged between the retaining elements 31, 32 in the direction of the double arrow 42 (FIG. Fig. 2 ) to act with a compressive force, which causes an elastic elongation of the nozzle lock nut 20 in the region between the holding elements 31 and 32.
  • FIG. 5 to 8 By way of example, different geometric configurations of the second holding elements 32 are shown, which, of course, can also be transferred to the first holding elements 31 in a similar manner.
  • Fig. 5 the case is shown in which in the longitudinal direction of the nozzle lock nut 20, three axially spaced-apart retaining grooves 38 are provided.
  • the retaining grooves 38 extend radially inwardly from the outside of the nozzle retaining nut 20.
  • the retaining grooves 38 are replaced by rectangular in cross-section retaining grooves 38a.
  • the in the Fig. 5 the case is shown in which in the longitudinal direction of the nozzle lock nut 20, three axially spaced-apart retaining grooves 38 are provided.
  • the retaining grooves 38 extend radially inwardly from the outside of the nozzle retaining nut 20.
  • the retaining grooves 38 are replaced by rectangular in cross-section retaining grooves 38a.
  • retaining grooves 38b use whose geometry corresponds to the geometry of the retaining grooves 38, but the retaining grooves 38b extend radially outward from the outer side 43 of the nozzle lock nut 20. Extend in a similar way also the rectangular in cross-section retaining grooves 38c according to the Fig. 8 radially outward.
  • the assembly of the fuel injector 10 serving clamping device 100 comprises two cooperating clamping elements 101, 102 for clamping the nozzle lock nut 20.
  • Each of the two clamping elements 101, 102 each have two interconnected in the longitudinal direction, semicircular clamping shells 103 to 106. How best by the Fig. 10 can be seen, are formed on the inner circumference or on the inner surface of the clamping shells 103 to 106 clamping portions 107, 108, the shape of the shape of the holding elements 31 and 32 is adapted so that the clamping portions 107, 108 cooperate positively with the holding elements 31, 32.
  • the longitudinally adjoining clamping elements 101, 102 are formed on the mutually facing end faces 109, 110 such that the end faces 109, 110 extend obliquely to the longitudinal axis of the clamping device 100.
  • a change in the distance between the clamping sections 107, 108 is effected relative to each other.
  • a lower clamping ring 112 and an upper clamping ring 113 are furthermore provided which engage the clamping device 100 or the two clamping elements 101, 102
  • the two opposite end portions comprise radially from the outside.
  • the assembly of the nozzle body 12, the throttle plate 13, the valve plate 14 and the holding body 15 with the nozzle lock nut 20 is done as follows: First, in the clamping device 100, the nozzle lock nut 20 is clamped, as shown in the FIGS. 9 and 10 is shown. Subsequently, by means of a radial rotation of the two clamping elements 101, 102 in the areas between the holding elements 31 and 32 on the nozzle retaining nut 20, a compressive force acting in the longitudinal direction of the nozzle clamping nut 20 is produced, which causes a (elastic) elongation of the nozzle retaining nut 20.
  • the nozzle body 12, the throttle plate 13 and the valve plate 14 in the nozzle retaining nut 20 are introduced in their correct position. It is essential that when screwing the nozzle retaining nut 20 with the holding body 15, the nozzle lock nut 20 is still in the clamping device 100 and is subjected to the force of the clamping device 100 , When screwing or connecting the nozzle lock nut 20 with the holder body 15, it is sufficient to carry out the screwing with a relatively low torque, that is, as soon as the components are at an axial stop, the Verschraubrea can be stopped.
  • a modified tensioner 100a is shown in the Fig. 11 .
  • the clamping device 100a find a preferably in the longitudinal direction in two parts, lower clamping ring 112a and an upper clamping ring 113a use, wherein the upper clamping ring 113a has a thread 117 on its outer side. While the upper clamping ring 113a bears directly against the second holding element 32 in a form-fitting manner, the lower clamping ring 112a is surrounded radially by a transition sleeve 119 which has a thread turn 118 on its outer side.
  • the two threads 117, 118 are oriented differently, that is, for example, the upper thread 117 is formed as a left-hand thread, while the lower thread 118 is formed as a right-hand thread (alternatively, it is conceivable, the two threads 117, 118 at the same orientation with different degrees of slope form).
  • the clamping elements 101 a and 102 a have on their inner surface with the threads 117, 118 cooperating threaded portions 121, 122.
  • the fuel injector 10 described so far as well as the tensioning device 100, 100a can be modified or modified in many ways without deviating from the idea of the invention.
  • This consists in elastically lengthening or prestressing the nozzle retaining nut 20 axially in its longitudinal direction during assembly of components in the nozzle retaining nut 20 or before connecting the nozzle retaining nut 20 to a retaining body 15, thereby producing a biasing force in the nozzle retaining nut 20, which, after a largely torque-free assembly with the holding body 15 generates an axial clamping force on the components located within the nozzle retaining nut 20 in order to form a dense fuel injector 10 even at relatively high operating pressures.

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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)
EP12186248.6A 2011-11-09 2012-09-27 Injecteur de carburant, procédé de montage d'un injecteur de carburant et dispositif de serrage pour le montage d'un injecteur de carburant Active EP2592260B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011086005A DE102011086005A1 (de) 2011-11-09 2011-11-09 Kraftstoffinjektor, Verfahren zur Montage eines Kraftstoffinjektors sowie Spanneinrichtung zur Montage eines Kraftstoffinjektors

Publications (2)

Publication Number Publication Date
EP2592260A1 true EP2592260A1 (fr) 2013-05-15
EP2592260B1 EP2592260B1 (fr) 2017-04-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12186248.6A Active EP2592260B1 (fr) 2011-11-09 2012-09-27 Injecteur de carburant, procédé de montage d'un injecteur de carburant et dispositif de serrage pour le montage d'un injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2592260B1 (fr)
DE (1) DE102011086005A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013220027A1 (de) 2013-10-02 2015-04-02 Robert Bosch Gmbh Kraftstoffinjektor, Verfahren zur Montage eines Kraftstoffinjektors sowie Vorrichtung zum Durchführen der Montage
DE102015224714A1 (de) 2015-12-09 2017-06-14 Robert Bosch Gmbh Verfahren zur Einstellung des Ankerhubs in einem Kraftstoffinjektor
DE102020113609A1 (de) * 2020-03-31 2021-09-30 Liebherr-Components Deggendorf Gmbh Kraftstoffinjektor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288486A2 (fr) * 2001-09-04 2003-03-05 Robert Bosch Gmbh Conduit de retour de carburant dans un système d'alimentation en carburant haute-pression
WO2005066487A1 (fr) * 2004-01-12 2005-07-21 Siemens Aktiengesellschaft Procede pour serrer a bloc un ecrou de serrage de buse d'injecteur utilise pour l'injection de carburant, et injecteur et ecrou de serrage de buse
GB2435303A (en) * 2006-02-15 2007-08-22 Delphi Tech Inc Clamping arrangement for an i.c. engine fuel injector assembly
DE102006049532A1 (de) * 2006-10-20 2008-04-24 Robert Bosch Gmbh Schraubverbindung für Kraftstoffinjektor
EP2187042A1 (fr) * 2008-11-14 2010-05-19 Robert Bosch GmbH Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit
WO2011092040A1 (fr) * 2010-01-28 2011-08-04 Robert Bosch Gmbh Procédé de liaison étanche à la haute pression d'au moins un corps en forme de plaque à un autre corps d'un injecteur de carburant et injecteur de carburant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288486A2 (fr) * 2001-09-04 2003-03-05 Robert Bosch Gmbh Conduit de retour de carburant dans un système d'alimentation en carburant haute-pression
WO2005066487A1 (fr) * 2004-01-12 2005-07-21 Siemens Aktiengesellschaft Procede pour serrer a bloc un ecrou de serrage de buse d'injecteur utilise pour l'injection de carburant, et injecteur et ecrou de serrage de buse
GB2435303A (en) * 2006-02-15 2007-08-22 Delphi Tech Inc Clamping arrangement for an i.c. engine fuel injector assembly
DE102006049532A1 (de) * 2006-10-20 2008-04-24 Robert Bosch Gmbh Schraubverbindung für Kraftstoffinjektor
EP2187042A1 (fr) * 2008-11-14 2010-05-19 Robert Bosch GmbH Nez d'injection avec un écrou de serrage avec une tête avec un diamètre de friction effectif réduit
WO2011092040A1 (fr) * 2010-01-28 2011-08-04 Robert Bosch Gmbh Procédé de liaison étanche à la haute pression d'au moins un corps en forme de plaque à un autre corps d'un injecteur de carburant et injecteur de carburant

Also Published As

Publication number Publication date
DE102011086005A1 (de) 2013-05-16
EP2592260B1 (fr) 2017-04-12

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