EP1373713B1 - 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 Download PDF

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Publication number
EP1373713B1
EP1373713B1 EP02726070A EP02726070A EP1373713B1 EP 1373713 B1 EP1373713 B1 EP 1373713B1 EP 02726070 A EP02726070 A EP 02726070A EP 02726070 A EP02726070 A EP 02726070A EP 1373713 B1 EP1373713 B1 EP 1373713B1
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EP
European Patent Office
Prior art keywords
annular
spherical segment
fuel injection
injection device
segment surface
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.)
Expired - Lifetime
Application number
EP02726070A
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German (de)
English (en)
Other versions
EP1373713B2 (fr
EP1373713A1 (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
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Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1373713A1 publication Critical patent/EP1373713A1/fr
Application granted granted Critical
Publication of EP1373713B1 publication Critical patent/EP1373713B1/fr
Publication of EP1373713B2 publication Critical patent/EP1373713B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a fuel injection device, in particular injector, for internal combustion engines, with a base body, with an injection housing, with a clamping device which comprises at least one clamping nut with a ring land and an annular shoulder on the injection housing and which axially clamps the injection housing with the base body, with a fuel inlet and at least one valve element.
  • Such a fuel injection device is known from DE 197 29 843 A1 known.
  • a fuel injection valve for internal combustion engines is shown, which has a clamping nut which rests with an inner, conical annular web on an annular shoulder of an injection housing. In this way, the injection housing is clamped against the base body.
  • the annular shoulder is formed curved on its side facing the annular web so that at a predetermined distance from the longitudinal axis of the fuel injector results in an annular circumferential support point at which the conical annular ridge rests in the mounted state.
  • EP 0 890 734 A2 describes a fuel injector in which an annular surface of the tensioner is formed in the manner of a portion of a circular section ring.
  • the present invention has the object to improve the seal between the injection housing and the base body in a fuel injection device of the type mentioned. Furthermore, the scatter of the injection quantity should be reduced. In addition, the wear on the nozzle needle guide 5 and on the nozzle needle seat is reduced by the uniform axial tensioning.
  • the clamping device has at least one ring land of the clamping nut facing annular surface which is convexly curved in the manner of a spherical segment surface, the center of which is arranged on a longitudinal axis of the fuel injection device.
  • the surface pressure in the contact area between the base body and the injection housing is made uniform, the occurrence of leaks in this contact area is less likely. Moreover, the likelihood of injector deformation is also less, such that the amount of fuel injection varies less from one fuel injector to the other, if any.
  • the tensioning device comprises a concave spherical segment surface which is complementary to the convex spherical segment surface and against which the convex spherical segment surface lies flat.
  • a kind of "ball socket ball joint” is created.
  • the alignment of the injection housing relative to the base body during assembly of the fuel injection device is particularly low-power and easy. This leads to a particularly uniform surface pressure at the junction between the base body and injection housing.
  • the clamping device one of Has convex spherical segment surface facing oblique and flat annular surface on which the spherical segment surface is applied linearly.
  • Such an oblique annular surface is easy to manufacture and enables the low-cost production of the fuel injection device according to the invention.
  • the oblique annular surface forms an angle of approximately 120 °. At such an angle, the axial forces necessary for a secure connection and sealing are still well transferred, and on the other hand, such a slope provides a good fit for the convex spherical segment surface.
  • the clamping device comprises an annular disc which is arranged between the injection housing and the clamping nut, wherein either the convex or the concave spherical segment surface or the oblique annular surface is formed on the annular disc.
  • annular disk allows, for example, the use of a conventional clamping nut, which keeps the production costs of the fuel injection device according to the invention low.
  • the injection housing may also have a conventional annular shoulder, on which neither a bevel nor a spherical segment surface is present when the annular disc according to the invention is provided.
  • the convex spherical segment surface is formed on the annular shoulder of the injection housing.
  • the injection housing is in any case a relatively complex part, at which the additional processing step means a comparatively little additional effort.
  • the alignment of the injection housing relative to the base body is further facilitated when the convex Ball segment surface and cooperating with this concave spherical segment surface or the oblique annular surface with a low-friction layer, preferably Teflon, are provided.
  • Fig. 1 It includes a base body 12, an injection housing 14 and a clamping nut 16. On the base body 12, a thread 18 is present, with which the clamping nut 16 is screwed.
  • the injection housing 14 has a recess extending in its longitudinal direction 20 is provided, in which a valve needle 22 is arranged.
  • a fuel inlet 24 supplies an annular space 26 between valve needle 22 and recess 20 with fuel.
  • the fuel injector 10 generally serves to inject fuel directly into the combustion chamber of an internal combustion engine. With it gasoline or diesel fuel can be injected.
  • the clamping nut 16 (see. Fig. 3-5 ) It is a hollow cylindrical part, which has a wall portion 30 and a in the in Fig. 1 lower end formed radially inwardly facing annular web 32 includes.
  • Upper surface 33 of the annular ridge 32 and the inner surface of the wall portion 30 are at an angle of approximately 90 ° to each other.
  • the injection housing 14 has a larger diameter portion 34 and a smaller diameter portion 36.
  • the diameter of the smaller-diameter portion 36 is slightly smaller than the diameter of the opening 38 bounded by the annular land 32 of the tightening nut 16.
  • the diameter of the portion 34 of the injection housing 14 is slightly smaller than the inner diameter of the wall portion 30 of the tightening nut 16.
  • annular shoulder 40 is formed between the portion 34 and the portion 36 of the injection housing 14.
  • the annular 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 injector 10.
  • the radius of the sphere from which the spherical segment surface 41 is cut out is R.
  • annular disc 44 is present (see. Fig. 2 ).
  • the inner diameter of the annular disc 44 is slightly larger than the outer diameter of the portion 36 of the injection housing 14, whereas the outer diameter of the annular disc 44 is slightly smaller than the inner diameter of the wall portion 30 of the clamping nut 16.
  • the top 45 of the annular disc 44 is formed 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 annular disc 44 has a conical depression.
  • the radius of the ball from which the concave spherical segment surface 46 is cut is thus also R, and the center M of this ball is also 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 ball segment surfaces 41 and 46 thus cooperate in the manner of a ball socket ball joint.
  • the clamping nut 16 with the annular web 32, the annular shoulder 40 on the injection housing 14 and the annular disc 44 together form a clamping device 48th
  • the assembly of the fuel injection device 10 by means of the tensioning device 48 proceeds as follows:
  • the annular disc 44 is pushed over from below over the portion 36 of the injection housing 14.
  • the concave spherical segment surface 46 of the annular disc 44 upwards, ie to the annular shoulder 40 of the injection housing 14 to.
  • the clamping nut 16 is pushed over the injection housing 14, wherein the annular web 32 is arranged below.
  • the clamping nut 16 is now bolted to the thread 18 on the base body 12.
  • a sealing element such as an O-ring, may be present between the two parts.
  • fuel injection device 10 is the in Fig. 6 upwardly facing surface of the annular web 32 of the clamping nut 16 is formed as an inclined annular surface 50.
  • the oblique annular surface 50 encloses an angle of approximately 120 ° (cf. Fig. 9 ).
  • the annular shoulder 40 of the injection housing 14 is not convexly curved in the present embodiment, but extends from the smaller diameter portion 36 of the injection housing 14 in a straight line and at an angle of approximately 90 ° radially outward.
  • the annular disc 44 in turn has on its underside an annular surface which is convexly curved in the manner of a spherical segment surface 41.
  • the top 45 of the annular disc 44 has a depression.

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 (7)

  1. Dispositif d'injection de carburant (10), notamment injecteur, pour moteurs à combustion interne, avec un corps de base (12), avec un boîtier d'injection (14), avec un dispositif de serrage (48), qui comprend au moins un écrou de serrage (16) avec une nervure annulaire (32) et un épaulement annulaire (40) sur le boîtier d'injection (14), et qui serre le boîtier d'injection (14) axialement avec le corps de base (12), avec une entrée de carburant (24), et avec au moins un élément de soupape (22), caractérisé en ce que le dispositif de serrage (48) présente au moins une surface annulaire tournée vers la nervure annulaire (32) de l'écrou de serrage (16), qui a une courbure convexe du type d'une surface de segment de sphère (41), dont le centre (M) est disposé sur un axe longitudinal (42) du dispositif d'injection de carburant (10).
  2. Dispositif d'injection de carburant (10) selon la revendication 1, caractérisé en ce que le dispositif de serrage (48) comprend une surface de segment de sphère concave (46) complémentaire de la surface de segment de sphère convexe (41), contre laquelle s'applique uniformément la surface de segment de sphère convexe (41).
  3. Dispositif d'injection de carburant (10) selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le dispositif de serrage (48) présente une surface annulaire oblique et plane (50) tournée vers la surface de segment de sphère convexe (41), contre laquelle s'applique linéairement la surface de segment de sphère convexe (41).
  4. Dispositif d'injection de carburant (10) selon la revendication 3, caractérisé en ce que la surface annulaire oblique (50) inclut un angle d'environ 120°.
  5. Dispositif d'injection de carburant (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de serrage (48) comprend une rondelle annulaire (44) qui est disposée entre le boîtier d'injection (14) et l'écrou de serrage (16), la surface de segment de sphère convexe (41) ou la surface de segment de sphère concave (46) ou la surface annulaire oblique étant réalisée sur la rondelle annulaire (44).
  6. Dispositif d'injection de carburant (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface de segment de sphère convexe (41) est réalisée sur l'épaulement annulaire (40) du boîtier d'injection (14).
  7. Dispositif d'injection de carburant (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface de segment de sphère convexe (41) et la surface de segment de sphère concave (46) coopérant avec elle ou la surface annulaire oblique (50) sont pourvues d'une couche antifriction, de préférence en téflon.
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
DE10115352 2001-03-28
DE10115325A DE10115325A1 (de) 2001-03-28 2001-03-28 Kraftstoff-Einspritzvorrichtung, insbesondere Injektor, für Brennkraftmaschinen
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 EP1373713A1 (fr) 2004-01-02
EP1373713B1 true 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)

Families Citing this family (6)

* 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
DE102021104408A1 (de) * 2021-02-24 2022-08-25 Robert Bosch Gesellschaft mit beschränkter Haftung Brennraumdichtung für einen Kraftstoffinjektor und Brennkraftmaschine

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE19608574A1 (de) † 1996-03-06 1997-09-11 Bosch Gmbh Robert Kraftstoffzuleitungseinrichtung
GB2311558A (en) 1996-03-28 1997-10-01 Stanadyne Automotive Corp Fuel injection nozzle with compressive radial pre-loading
DE19705227A1 (de) * 1997-02-12 1998-08-13 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19735665A1 (de) * 1997-06-25 1999-01-07 Bosch Gmbh Robert Brennstoffeinspritzanlage
DE19729843A1 (de) 1997-07-11 1999-01-14 Bosch Gmbh Robert Kraftstoffeinspritzventil
IT1306311B1 (it) † 1998-07-01 2001-06-04 Magneti Marelli Spa Sistema di accoppiamento tra testata del motore,iniettore e collettorecarburante .
DE29814934U1 (de) 1998-08-20 2000-01-05 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
GB9819746D0 (en) 1998-09-11 1998-11-04 Lucas Ind Plc Fuel injector
US6705647B1 (en) * 2000-11-22 2004-03-16 Strahman Valves, Inc. Fluid coupling device

Also Published As

Publication number Publication date
EP1373713B2 (fr) 2013-07-03
US6994280B2 (en) 2006-02-07
DE10115325A1 (de) 2002-10-17
JP2004518888A (ja) 2004-06-24
DE50213647D1 (de) 2009-08-13
US20030173427A1 (en) 2003-09-18
EP1373713A1 (fr) 2004-01-02
WO2002077443A1 (fr) 2002-10-03
JP4210522B2 (ja) 2009-01-21

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