EP1373713A1 - Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne - Google Patents

Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne

Info

Publication number
EP1373713A1
EP1373713A1 EP02726070A EP02726070A EP1373713A1 EP 1373713 A1 EP1373713 A1 EP 1373713A1 EP 02726070 A EP02726070 A EP 02726070A EP 02726070 A EP02726070 A EP 02726070A EP 1373713 A1 EP1373713 A1 EP 1373713A1
Authority
EP
European Patent Office
Prior art keywords
spherical segment
annular
segment surface
fuel injection
injection device
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
EP02726070A
Other languages
German (de)
English (en)
Other versions
EP1373713B1 (fr
EP1373713B2 (fr
Inventor
Michael Kurz
Gerd Wahr
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7679408&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1373713(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1373713A1 publication Critical patent/EP1373713A1/fr
Publication of EP1373713B1 publication Critical patent/EP1373713B1/fr
Application granted granted Critical
Publication of EP1373713B2 publication Critical patent/EP1373713B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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

Definitions

  • Fuel injection device in particular injector, for internal combustion engines
  • the invention relates to a fuel injection device, in particular an injector, for internal combustion engines, with a base body, with an injection housing, with a tensioning device which comprises at least one tension nut with an annular web and an annular shoulder on the injection housing and which braces the injection housing axially with the base body a fuel inlet and with at least one valve element.
  • Such a fuel injection device is known from DE 197 29 843 AI. There is a
  • Fuel injection valve for internal combustion engines shown which has a clamping nut which rests with an inner, conical ring web on an annular shoulder of an injection housing. In this way, the injection housing is clamped against the base body.
  • the ring shoulder is curved on its side facing the ring web in such a way that, at a predetermined distance from the longitudinal axis of the fuel injection device, there is a ring-shaped circumferential contact point against which the conical ring web rests in the assembled state.
  • the object of the present invention is to improve the seal between the injection housing and the base body in a fuel injection device of the type mentioned at the outset. Furthermore, the scatter of the injection quantity should be reduced. In addition, the uniform axial tensioning reduces the wear on the nozzle needle guide and on the nozzle needle seat.
  • the tensioning device has at least one ring surface facing the ring web of the tension nut, which is convexly curved in the manner of a spherical segment surface.
  • the surface pressure in the contact area between the base body and the injection housing is even, the occurrence of leaks in this contact area is less likely.
  • the likelihood of deformation of the injection housing is also less, so that the injection quantity varies from one fuel injector to another less, if at all.
  • the tensioning device comprises a concave spherical segment surface complementary to the convex spherical segment surface, against which the convex spherical segment surface lies flat.
  • the alignment of the injection housing with respect to the base body is particularly low-power and light when the fuel injection device is installed. This leads to a particularly uniform surface pressure at the connection point between the base body and the injection housing.
  • the clamping device is one of the has convex spherical segment surface facing oblique and flat ring surface on which the spherical segment surface lies linearly.
  • Such an inclined annular surface is easy to manufacture and enables the fuel injector according to the invention to be manufactured inexpensively.
  • the oblique ring surface encloses an angle of approximately 120 °. At such an angle, the axial forces required for a secure connection and sealing are still well transmitted, and on the other hand, such an incline offers a good fit for the convex spherical segment surface.
  • the clamping device comprises an annular disk which is arranged between the injection housing and the clamping nut, either the convex or the concave spherical segment surface or the oblique annular surface being formed on the annular disk.
  • annular disc enables, for example, the use of a conventional clamping nut, which keeps the manufacturing costs of the fuel injection device according to the invention low.
  • the injection housing can also have a conventional ring shoulder, on which there is therefore neither a bevel nor a spherical segment surface if the ring disk according to the invention is provided.
  • the convex spherical segment surface is formed on the ring shoulder of the injection housing.
  • the injection housing is a relatively complex part, on which the additional processing step means comparatively little additional effort.
  • Alignment of the injection housing with respect to the base body is made even easier if the convex Spherical segment surface and the concave spherical segment surface cooperating with this or the oblique ring surface are provided with a low-friction layer, preferably Teflon.
  • FIG. 1 a partial longitudinal section through a first exemplary embodiment of a fuel injection device with a clamping nut and an annular disk;
  • Fig. 2 a section through the washer
  • Fig. 3 a plan view of the clamping nut of the
  • Fig. 4 a partial longitudinal section or a
  • Fig. 5 a section along the line V-V of Fig. 4;
  • FIG. 6 a view similar to FIG. 1 of a second exemplary embodiment of a fuel injection device with a clamping nut and an annular disk;
  • Fig. 7 a plan view of the washer
  • Fig. 8 a section along the line IX-IX of Fig. 7;
  • Fig. 9 a longitudinal section through an area of
  • a fuel injection device bears the overall reference number 10. It includes a base body 12, an injection housing 14 and a clamping nut 16. On the base body 12 there is a thread 18 with which the clamping nut 16 is screwed. In the injection housing 14 there is a recess 20 running in the longitudinal direction thereof, in which a valve needle 22 is arranged. A fuel inlet 24 supplies an annular space 26 between the valve needle 22 and the recess 20 with fuel. Axial movement of the valve needle 22 allows fuel outlet openings (not shown in the figure) to be connected to the annular space 26, so that fuel is emitted from the fuel injection device 10.
  • the fuel injection device 10 is generally used to inject fuel directly into the combustion chamber of an internal combustion engine. It can be used to inject gasoline or diesel fuel.
  • the clamping nut 16 (cf. FIGS. 3-5) is a hollow cylindrical part which comprises a wall section 30 and an annular web 32 pointing radially inwards on its lower end which is formed in FIG. 1.
  • the upper surface 33 of the annular web 32 in FIG. 1 and the inner surface of the wall section 30 lie at an angle of approximately 90 ° to one another.
  • the injection housing 14 has a section 34 with a larger and a section 36 with a smaller diameter.
  • the diameter of the section 36 with a smaller diameter is somewhat smaller than the diameter of the opening 38 delimited by the ring web 32 of the clamping nut 16.
  • the diameter of the section 34 of the injection housing 14 is somewhat smaller than the inside diameter of the wall section 30 of the clamping nut 16.
  • An annular shoulder 40 is formed between the section 34 and the section 36 of the injection housing 14.
  • the ring shoulder 40 is convexly curved in the manner of a spherical segment surface 41.
  • the center M of the spherical segment surface 41 lies on the longitudinal axis 42 of the fuel injection device 10.
  • the radius of the sphere from which the spherical segment surface 41 is cut out is R.
  • An annular disk 44 is present between the ring web 32 of the clamping nut 16 and the annular shoulder 40 on the injection housing 14 (cf. FIG. 2).
  • the inside diameter of the ring disk 44 is slightly larger than the outside diameter of the section 36 of the injection housing 14, whereas the outside diameter of the ring disk 44 is slightly smaller than the inside diameter of the wall section 30 of the clamping nut 16.
  • the upper side 45 of the ring disk 44 is designed as a concave spherical segment surface 46, which is complementary to the convex spherical segment surface 41 on the injection housing 14.
  • the underside of the washer 44 has a conical depression.
  • the radius of the ball, from which the concave spherical segment surface 46 is cut out, is thus also R, and the center M of this ball also lies on the longitudinal axis 42 of the fuel injector 10.
  • Both spherical segment surfaces 41 and 46 are coated with a low-friction Teflon layer (not visible).
  • the spherical segment surfaces 41 and 46 thus work together in the manner of a ball socket ball head joint.
  • the clamping nut 16 with the ring web 32, the ring shoulder 40 on the injection housing 14 and the ring disk 44 form a clamping device 48 overall.
  • the assembly of the fuel injection device 10 by means of the tensioning device 48 proceeds as follows:
  • the washer 44 is pushed over the section 36 of the injection housing 14 from below.
  • the concave spherical segment surface 46 of the annular disc 44 faces upward, that is to say to the annular shoulder 40 of the injection housing 14.
  • the clamping nut 16 is pushed over the injection housing 14, the annular web 32 being arranged at the bottom.
  • the clamping nut 16 is now screwed onto the base body 12 with the thread 18.
  • an area of the injection housing 14 which is covered by the clamping nut 16 in FIG. 1 comes into contact with an area of the base body 12 which is also covered in FIG. 1.
  • a sealing element for example an O-ring, can also be present between the two parts.
  • Parts and elements which have functions equivalent to the fuel injection device shown in FIGS. 1-5 have the same reference numerals and are not explained again in detail.
  • the surface of the ring web 32 of the clamping nut 16 pointing upwards in FIG. 6 is designed as an oblique ring surface 50.
  • the oblique ring surface 50 encloses an angle of approximately 120 ° (cf. FIG. 9).
  • the annular shoulder 40 of the injection housing 14 is not convexly curved, but extends straight from the section 36 with a smaller diameter of the injection housing 14 and at an angle of approximately 90 ° radially outwards.
  • the annular disk 44 in turn has an annular surface on its underside which is convexly curved in the manner of a spherical segment surface 41.
  • the top 45 of the annular disc 44 has a depression.
  • the decoupling of the alignment of the clamping nut 16 on the one hand and the alignment of the injection housing 14 on the other hand is thus achieved by the oblique ring surface 50 and the convex spherical segment surface 41 cooperating therewith.

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)

Abstract

La présente invention concerne un dispositif d'injection de carburant (10), notamment un injecteur, pour moteurs à combustion interne. Ce dispositif d'injection de carburant comprend un corps de base (12), un boîtier d'injection (14) et un dispositif de tension (48). Le dispositif de tension (48) comprend au moins un écrou de tension (16) présentant un élément jointif annulaire (32), ainsi qu'un épaulement annulaire (40) situé sur le boîtier d'injection (14). Ce dispositif de tension (48) permet de mettre sous tension le boîtier d'injection (14) axialement avec le corps de base (12). Le dispositif d'injection de carburant comprend également un orifice d'admission de carburant (24) et au moins un élément de soupape (22). Afin d'améliorer l'étanchéité entre le corps de base (12) et le boîtier d'injection (14), le dispositif de tension (48) présente au moins une surface annulaire, qui fait face à l'élément jointif annulaire (32) de l'écrou de tension (16) et qui est courbée de manière convexe, telle une surface de segment sphérique (41).
EP02726070.2A 2001-03-28 2002-03-22 Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne Expired - Lifetime EP1373713B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10115325A DE10115325A1 (de) 2001-03-28 2001-03-28 Kraftstoff-Einspritzvorrichtung, insbesondere Injektor, für Brennkraftmaschinen
DE10115352 2001-03-28
PCT/DE2002/001040 WO2002077443A1 (fr) 2001-03-28 2002-03-22 Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne

Publications (3)

Publication Number Publication Date
EP1373713A1 true EP1373713A1 (fr) 2004-01-02
EP1373713B1 EP1373713B1 (fr) 2009-07-01
EP1373713B2 EP1373713B2 (fr) 2013-07-03

Family

ID=7679408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02726070.2A Expired - Lifetime EP1373713B2 (fr) 2001-03-28 2002-03-22 Dispositif d'injection de carburant, notamment injecteur, pour moteurs a combustion interne

Country Status (5)

Country Link
US (1) US6994280B2 (fr)
EP (1) EP1373713B2 (fr)
JP (1) JP4210522B2 (fr)
DE (2) DE10115325A1 (fr)
WO (1) WO2002077443A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022179812A1 (fr) * 2021-02-24 2022-09-01 Robert Bosch Gmbh Joint d'étanchéité de chambre de combustion pour un injecteur de carburant et moteur à combustion interne

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002242796A (ja) * 2001-02-14 2002-08-28 Denso Corp 燃料噴射ノズル
DE10149514A1 (de) * 2001-10-08 2003-04-24 Bosch Gmbh Robert Kraftstoffinjektor mit Kompensationselement für Kraftstoffeinspritzsysteme
GB0603056D0 (en) * 2006-02-15 2006-03-29 Delphi Tech Inc Fuel injector
JP2008232120A (ja) * 2007-03-23 2008-10-02 Denso Corp 燃料噴射弁
DE102012217991A1 (de) 2012-10-02 2014-04-03 Continental Automotive Gmbh Düsenbaugruppe für einen Fluidinjektor und Fluidinjektor

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DE490743C (de) † 1927-09-13 1930-01-31 Ove Petersen Brennstoffeinspritzventil fuer luftlose Einspritzung bei Verbrennungsmotoren
GB669110A (en) † 1948-06-04 1952-03-26 Burmeister & Wains Mot Mask Improvements in or relating to fuel injection nozzles for internal combustion engines
CH296118A (de) † 1951-10-13 1954-01-31 Saurer Ag Adolph Einspritzdüse für Brennkraftmaschinen.
US3412718A (en) † 1967-06-13 1968-11-26 Gillett Tool Co Precision fuel metering system
DE2032005A1 (de) † 1970-06-29 1972-01-05 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzventil
DD141832A1 (de) * 1978-10-31 1980-05-21 Joachim Schmidt Verfahren und vorrichtung zur herstellung von l-ascorbinsaeure
JPH0660609B2 (ja) * 1986-03-07 1994-08-10 工業技術院長 ディーゼル機関の燃料噴射ノズルボディー
JPH06221258A (ja) 1993-01-27 1994-08-09 Mazda Motor Corp 強制着火式直噴ディーゼルエンジン
JPH08200182A (ja) † 1995-01-25 1996-08-06 Zexel Corp 電磁式燃料噴射弁およびその取付け構造
DE19508636A1 (de) * 1995-03-10 1996-09-12 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19523243B4 (de) * 1995-06-27 2009-04-02 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen mit einer Spannmutter mit konisch ausgebildeter Ringschulter
JPH09112697A (ja) † 1995-10-17 1997-05-02 Mitsubishi Electric Corp シールリング
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Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022179812A1 (fr) * 2021-02-24 2022-09-01 Robert Bosch Gmbh Joint d'étanchéité de chambre de combustion pour un injecteur de carburant et moteur à combustion interne

Also Published As

Publication number Publication date
JP4210522B2 (ja) 2009-01-21
DE50213647D1 (de) 2009-08-13
US20030173427A1 (en) 2003-09-18
DE10115325A1 (de) 2002-10-17
EP1373713B1 (fr) 2009-07-01
US6994280B2 (en) 2006-02-07
EP1373713B2 (fr) 2013-07-03
JP2004518888A (ja) 2004-06-24
WO2002077443A1 (fr) 2002-10-03

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