EP1771655B1 - Ecrou de serrage - Google Patents

Ecrou de serrage Download PDF

Info

Publication number
EP1771655B1
EP1771655B1 EP05756825A EP05756825A EP1771655B1 EP 1771655 B1 EP1771655 B1 EP 1771655B1 EP 05756825 A EP05756825 A EP 05756825A EP 05756825 A EP05756825 A EP 05756825A EP 1771655 B1 EP1771655 B1 EP 1771655B1
Authority
EP
European Patent Office
Prior art keywords
clamping nut
section
cylindrical section
injector
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.)
Not-in-force
Application number
EP05756825A
Other languages
German (de)
English (en)
Other versions
EP1771655A1 (fr
Inventor
Christoph Buehler
Oliver Berger
Igor Iraeta Munduate
Carmen Mai
Alfred Witt
Manfred Ganter
Anna Huber
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 EP1771655A1 publication Critical patent/EP1771655A1/fr
Application granted granted Critical
Publication of EP1771655B1 publication Critical patent/EP1771655B1/fr
Not-in-force 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
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the invention relates to a clamping nut for an internal combustion engine injector having a first substantially cylindrical portion, at least a second cylindrical portion and a shoulder between the first portion and the second portion, the first portion having a smaller diameter than the second portion, and wherein the clamping nut is made by deep drawing.
  • injector includes all types of devices for injecting fuel into the combustion chamber of an internal combustion engine, such as injection nozzles, pump-nozzle units (PDE) and pump-line-nozzle Units (PLDE), understood. For simplicity, however, hereinafter only the term “injector” will be used.
  • Injector initiated. It has been found in practice that it can come because of these axial forces in the region between the first cylindrical portion and the second cylindrical portion to deformations of the clamping nut when it is screwed onto an injector and tightened with the required torque.
  • the DE 10017113A1 discloses another example.
  • the invention has for its object to provide a respect.
  • Their mechanical and thermal properties further improved clamping nut whose production costs are comparable low, as in a known from the prior art by deep drawing produced clamping nut.
  • the advantages of a workpiece produced by forming namely high production capacity can be maintained at the same time low production costs and at the same time the disadvantages of known from the prior art and produced by deep drawing clamping nuts can be avoided.
  • the shoulder between the first cylindrical section and the second cylindrical section is better supported by the first cylindrical section, or the introduction of force from the shoulder into the second cylindrical section is improved.
  • the thermal storage capacity of the clamping nut in the region of the first cylindrical section is also increased at the same time.
  • the temperature peaks in the region of the nozzle body are reduced by about 10 ° C. during operation of the injector equipped with a clamping nut according to the invention. This temperature reduction could be determined by comparative measurements on different samples.
  • the input mentioned object is also achieved in a clamping nut for an injector of an internal combustion engine according to claim 2.
  • the shoulder forms a contact surface for a nozzle body and / or a sealing surface for a nozzle body of the injector.
  • the clamping nut can be screwed in a simple manner with a desired torque to the injector, in a further advantageous embodiment of the invention, at least one projection and / or recess for attaching a screwing provided on the clamping nut.
  • the object underlying the invention is also achieved by a method for producing a clamping nut for an injector of an internal combustion engine according to claim 8.
  • the clamping nut is calibrated before upsetting the first cylindrical portion. This improves the dimensional accuracy of the clamping nut according to the invention.
  • the clamping nut is punched before upsetting the first cylindrical portion in the region of the first cylindrical portion.
  • FIG. 1 shows a clamping nut according to the invention provided in its entirety by the reference numeral 1 in longitudinal section.
  • the clamping nut 1 consists with regard to the invention of a first cylindrical portion 3 and a second also substantially cylindrical portion. 5
  • the diameter of the first cylindrical portion 3 is smaller than the diameter of the second cylindrical portion 5, so that there is a shoulder 7 between the first cylindrical portion 3 and the second cylindrical portion 5.
  • the second cylindrical portion 5 is executed stepped, but this is irrelevant to the invention. Therefore, for all embodiments of clamping nuts 1, the second cylindrical section 5 is stepped or partially even frusto-conical, claimed protection.
  • an internal thread 9 is provided.
  • the clamping nut 1 serves to screw a nozzle body of an injector, not shown, with a likewise not shown valve body of an injector.
  • the valve body, not shown, of the injector has an external thread which cooperates with the internal thread 9 of the clamping nut 1.
  • the nozzle body (not shown) has a cooperating with the paragraph 7 of the clamping nut 1 paragraph in its outer contour, so that by tightening the clamping nut 1 in the external thread of the valve body, not shown, the nozzle body can be clamped to the valve body.
  • Fig. 1 provided over the circumference a plurality of recesses 11 into which a screwing can be introduced. With the help of this Einschraubtechnikmaschineschw also not shown, the clamping nut can be tightened with the required torque.
  • the geometry of the clamping nut 1 is of course directed, above all, according to the dimensions of the nozzle body, not shown, and the valve body, not shown. Around these components, the clamping nut 1 is possible thin-walled, that means with as little material and space requirements, led.
  • the paragraph 7 results from the fact that an inner diameter D 1 of the first cylindrical portion 3 is smaller than an inner diameter D 2 of the second cylindrical portion 5 in the immediate vicinity of the paragraph 7th
  • the clamping nut 1 has a wall thickness 13.
  • the clamping nut 1 has a wall thickness 15 in the region of the second cylindrical section. It is of particular importance for the invention that the wall thickness 13 in the region of the first cylindrical portion relative to the wall thickness 15 of the second cylindrical portion 5 is significantly increased. As a result, the load capacity of the paragraph 7 with respect. Axial forces that occur inevitably during clamping of the nozzle body, not shown, with the valve body, not shown, significantly.
  • an outer diameter D 3 of the first cylindrical portion 3 is even larger than the inner diameter D 2 of the second cylindrical portion 5. This results in the required load capacity of the paragraph 7 in the axial direction.
  • the accumulation of material in the region of the first cylindrical section 3 significantly reduces the temperatures occurring during operation on the nozzle body. This is due essentially to the large contact area between the nozzle body and the first cylindrical section 3 and the accumulation of material in the region of the first cylindrical section 3, which leads to an increase in the storage capacity for sensible heat.
  • temperature peaks resulting from short Full load operating states of the internal combustion engine result, attenuated in their effect on the nozzle body.
  • the reduction of the maximum occurring temperatures in the nozzle body leads to a reduction of the wear of the nozzle needle, not shown, and their guidance in the nozzle body and an increase in the life of the injector.
  • the clamping nut 1 is produced by a combined production method, consisting of deep-drawing operations and upsetting operations.
  • the essential manufacturing steps in connection with the invention are described below with reference to FIGS. 2 to 5 explained in detail.
  • FIG. 2 An intermediate stage of the production of a clamping nut 1 according to the invention is shown. How this intermediate stage is achieved, a person skilled in the art of forming know by his expertise, so that is omitted in connection with the description of the invention to these explanations.
  • the wall thickness 13 of the first cylindrical portion and the wall thickness 15 of the second cylindrical portion are substantially equal. This also applies to the processing stages that are in the Figures 3 and 4 are shown.
  • FIG. 3 is the in FIG. 2 shown blank substantially unchanged, but this blank was subjected to a calibration process. As a result, the dimensional accuracy of the blank of a clamping nut 1 is improved, which has a positive effect on the subsequent processing steps.
  • the calibration process according to FIG. 3 If necessary after a drawing process can be made. However, if the precision of the blanks produced by the deep drawing sufficient, the calibration process can be omitted.
  • FIG. 4 the blank of a clamping nut 1 is shown, wherein in the region of the first section 1 from the cup-shaped blank according to FIGS. 2 and 3 a hole 17 was punched out.
  • the first cylindrical portion 3 is compressed, the outer diameter D 3 of the first cylindrical portion 3 in the diameter remains almost constant, while the inner diameter D 1 of the first cylindrical portion 3 decreases. As a result, thereby the wall thickness 13 of the first cylindrical portion 3 with respect to the wall thickness 15 of the second cylindrical portion 15, which remains substantially unchanged, increased.
  • the clamping nut 1 is further processed by a flange 19 is removed and, for example, the internal thread 9 (see FIG. 1 ) is produced by thread forming or another method.

Landscapes

  • 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)

Claims (10)

  1. Ecrou de serrage pour un injecteur de moteur à combustion interne, comprenant une première portion cylindrique (3), une deuxième portion cylindrique (5) et un épaulement (7) entre la première portion (3) et la deuxième portion (5), la première portion (3) présentant un plus petit diamètre (D1) que la deuxième portion (5), et l'écrou de serrage (1) étant fabriqué par emboutissage profond, caractérisé en ce que la première portion cylindrique (3) est écrasée de telle manière qu'une épaisseur de paroi (13) dans la région de la première portion cylindrique (3) soit accrue par rapport à une épaisseur de paroi (15) dans la région de la deuxième portion cylindrique (5).
  2. Ecrou de serrage pour un injecteur de moteur à combustion interne, comprenant une première portion cylindrique (3), une deuxième portion cylindrique (5) et un épaulement (7) entre la première portion (3) et la deuxième portion (5), la première portion (3) présentant un plus petit diamètre (D1) que la deuxième portion (5), caractérisé en ce que la première portion cylindrique (3) est écrasée de telle manière qu'une épaisseur de paroi (13) dans la région de la première portion cylindrique (3) soit accrue par rapport à une épaisseur de paroi (15) dans la région de la deuxième portion cylindrique (5) et en ce que l'écrou de serrage (1) est fabriqué par déformation par compression ou par formage par extrusion.
  3. Ecrou de serrage selon la revendication 1 ou 2, caractérisé en ce que l'épaulement (7) forme une surface d'appui pour un corps de buse de l'injecteur.
  4. Ecrou de serrage selon l'une quelconque des revendications précédentes, caractérisé en ce que l'épaulement (7) forme une surface d'étanchéité pour un corps de buse de l'injecteur.
  5. Ecrou de serrage selon l'une quelconque des revendications précédentes, caractérisé en ce que le filetage interne (9) est disposé à l'extrémité de l'écrou de serrage (1) opposée à la première portion (3).
  6. Ecrou de serrage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins une saillie et/ou un renfoncement (11) est/sont prévu(s) sur l'écrou de serrage (1) pour le positionnement d'un outil de vissage.
  7. Ecrou de serrage selon l'une quelconque des revendications précédentes, caractérisé en ce que la deuxième portion cylindrique (5) est réalisée sous forme étagée.
  8. Procédé de fabrication d'un écrou de serrage (1) pour un injecteur de moteur à combustion interne, caractérisé par les étapes de procédé suivantes :
    - fabrication d'un écrou de serrage (1) avec une première portion cylindrique (3) et une deuxième portion cylindrique (5) et avec un épaulement (7) entre la première portion cylindrique (3) et la deuxième portion cylindrique (5), par emboutissage profond d'une pièce brute, la première portion présentant un plus petit diamètre (D1) que la deuxième portion (5),
    caractérisé en ce que
    la première portion cylindrique (3) est écrasée de telle manière qu'une épaisseur de paroi (13) dans la première portion cylindrique (3) soit accrue.
  9. Procédé selon la revendication 8, caractérisé en ce que l'écrou de serrage (1) est fabriqué en plusieurs passes.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que l'écrou de serrage (1) est étalonné après au moins une passe.
EP05756825A 2004-07-20 2005-06-29 Ecrou de serrage Not-in-force EP1771655B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004035116A DE102004035116A1 (de) 2004-07-20 2004-07-20 Spannmutter
PCT/EP2005/053079 WO2006008225A1 (fr) 2004-07-20 2005-06-29 Ecrou de serrage

Publications (2)

Publication Number Publication Date
EP1771655A1 EP1771655A1 (fr) 2007-04-11
EP1771655B1 true EP1771655B1 (fr) 2011-08-10

Family

ID=34971117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05756825A Not-in-force EP1771655B1 (fr) 2004-07-20 2005-06-29 Ecrou de serrage

Country Status (6)

Country Link
EP (1) EP1771655B1 (fr)
KR (1) KR101092689B1 (fr)
CN (1) CN101018944A (fr)
AT (1) ATE519940T1 (fr)
DE (1) DE102004035116A1 (fr)
WO (1) WO2006008225A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005062543A1 (de) * 2005-12-27 2007-07-05 Robert Bosch Gmbh Spannmutter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908154B4 (de) * 1999-02-25 2006-11-09 Schaeffler Kg Spannelement
DE10017112B4 (de) * 2000-04-06 2006-06-01 Schaeffler Kg Spannmutter
DE10017113B4 (de) * 2000-04-06 2006-02-09 Ina-Schaeffler Kg Spannmutter

Also Published As

Publication number Publication date
KR101092689B1 (ko) 2011-12-09
EP1771655A1 (fr) 2007-04-11
ATE519940T1 (de) 2011-08-15
WO2006008225A1 (fr) 2006-01-26
KR20070033434A (ko) 2007-03-26
CN101018944A (zh) 2007-08-15
DE102004035116A1 (de) 2006-02-16

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