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EP1770275B1 - Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant - Google Patents

Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant Download PDF

Info

Publication number
EP1770275B1
EP1770275B1 EP06120340A EP06120340A EP1770275B1 EP 1770275 B1 EP1770275 B1 EP 1770275B1 EP 06120340 A EP06120340 A EP 06120340A EP 06120340 A EP06120340 A EP 06120340A EP 1770275 B1 EP1770275 B1 EP 1770275B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
hole
nozzle body
fuel injection
fuel
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
EP06120340A
Other languages
German (de)
English (en)
Other versions
EP1770275A1 (fr
Inventor
Giovanni Ferraro
Dietmar Uhlmann
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 EP1770275A1 publication Critical patent/EP1770275A1/fr
Application granted granted Critical
Publication of EP1770275B1 publication Critical patent/EP1770275B1/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
    • F02M61/04—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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a hole nozzle for a fuel injection device of a fuel injection system, in particular for use in a common rail system, according to the preamble of claim 1.
  • Such a hole nozzle is for example by the WO 2004/033890 A known.
  • a known hole nozzle has within the nozzle body on a control chamber which is connected via a flow restrictor with a nozzle needle chamber.
  • the control chamber is formed within a sealing sleeve whose sealing edge has the flow restrictor at one point.
  • a perforated nozzle in which a damping space in the form of a blind bore is formed in a valve holding body. Via a throttle, the damping chamber is connected to a fuel inlet channel.
  • pressure waves in the fuel can be damped. Since the pressure waves generated by the opening and closing of the nozzle needle and thus propagate from the nozzle needle chamber, it is particularly advantageous that the attenuation of the pressure waves can take place spatially close to this area.
  • the hydraulic connection of the storage space to the nozzle needle space with the aid of at least one throttle element ensures that the pressures in the nozzle needle space and the storage space can be different from each other.
  • the nozzle needle space and the storage space form independent hydraulic elements.
  • the hole nozzle according to the invention is based on the idea that it is possible to be able to use a section of material oversized even when a maximum pressure is applied in a region of a fuel injection system other areas of the fuel injection system spatially removed from this section of material to relieve.
  • a total fuel injection system can be created, which is particularly robust against high maximum loads, which are particularly caused by pressure waves.
  • the invention further relates to a fuel injection device of a fuel injection system with a hole nozzle.
  • a fuel injection system of an internal combustion engine collectively the reference numeral 10. It includes a fuel tank 12, from which a conveyor system 14, the fuel to a fuel rail ("rail" 16 promotes.
  • the conveyor system 14 may include a prefeed pump and a high pressure pump.
  • a plurality of fuel injectors 18 are connected, of which in FIG. 1 only one is shown.
  • the fuel injection device 18 has a high-pressure port 20.
  • the fuel injection device 18 is assigned to a combustion chamber 22 of an internal combustion engine, not shown, into which it directly injects the fuel using a hole nozzle 24 described in more detail below.
  • a return line 26 leads back to the fuel tank 12.
  • the return line 26 is connected to the fuel injection device 18 via a low pressure port 28.
  • the fuel injection device 18 and the hole nozzle 24 mounted thereon are in FIG FIG. 2 shown in more detail.
  • the in FIG. 2 marked section III is in FIG. 3 shown enlarged.
  • the hole nozzle 24 has a elongated nozzle body 30, which has at its fuel injector 18 end facing a radially outwardly extended portion 32.
  • a centrally arranged nozzle needle chamber 34 is provided, in which a nozzle needle 36 is arranged.
  • the nozzle needle 36 opens and closes a nozzle needle seat 38 provided at the end of the nozzle needle space 34.
  • the radially widened region 32 has, on its side facing away from the fuel injection device 18, an annular nozzle body shoulder 40, which cooperates with a corresponding annular shoulder 42 of a nozzle retaining nut 44.
  • the nozzle lock nut 44 is a in FIG. 3 not further illustrated threaded secured to the fuel injection device 18. With the help of paragraph 42, the nozzle body shoulder 40 and thus the radially expanded portion 32 against a in FIG. 3 pressed above the hole nozzle 24 shown intermediate element 46.
  • the intermediate element 46 (throttle plate) is adjoined by a valve plate 48, which has a valve designated overall by 50.
  • the valve 50 can be moved by means of a known and therefore not further shown actuator in 52 directions of actuation directions to open the valve 50 or close.
  • the valve 50 is a in the FIG. 3 not shown drain throttle with a control chamber 54 hydraulically connected.
  • the control space 54 is substantially limited by the in FIG. 3 upper end of the nozzle needle 36 and the intermediate element 46.
  • In the control chamber 54 opens an inlet throttle 56, which is fed by means of a fuel inlet 58 with fuel.
  • the fuel inlet 58 is also hydraulically with the Düsennadelraum 34 connected.
  • a further line 60 is provided between the valve 50 and the nozzle needle chamber 34.
  • the valve 50 is opened so that fuel can flow from the control chamber 54 via the outlet throttle, not shown. At the same time, fuel flows through the inlet throttle 56 into the control chamber 54. If the throttling effect of the outlet throttle (not shown) is smaller than the throttle effect of the inlet throttle 56, the pressure in the control chamber 54 can be reduced. From a certain pressure drop, the nozzle needle 36 can be lifted out of the nozzle needle seat 38 against the action of a spring element 62 with the aid of the higher pressure applied in the nozzle needle chamber 34, so that injection takes place into the combustion chamber 22.
  • control chamber 54 is sealed relative to the nozzle needle chamber 34 radially outward by means of a sleeve member 64 (control chamber sleeve) which bears sealingly against the intermediate element 46.
  • a sleeve member 64 control chamber sleeve
  • the spring element 62 could also be formed as a cylindrical sleeve, as shown in the DE 102 13 382 A1 is described. This possibility also exists for the hole nozzle according to the invention described below.
  • FIGS. 4a and 5a the nozzle body 30 of a perforated nozzle 24 according to the invention is shown.
  • This nozzle body 30 has a comparatively slender nozzle body shaft 66, to which a radially outwardly stepped portion 68 connects, to which in turn the radially outwardly extended region 32 connects.
  • the wall of the radially outwardly widened region 32 delimits a substantially cylindrical space 70. This space 70 is limited to the nozzle body shaft 66 by an annular bottom 72.
  • the radially widened region 32 has two part-cylindrical depressions 74 extending essentially in the longitudinal direction of the nozzle body 30.
  • the recesses 74 are offset from each other by a deviating from 180 ° degree to correspondingly arranged pins in the intermediate element 46 according to FIG. 3 are arranged to record. In this way, the hole nozzle 24 can be mounted in a certain rotational position on the fuel injection device 18.
  • annular outer contact surface 76 is formed. This seals the space 70 against the intermediate element 46.
  • a sleeve member 78 which has a substantially hollow cylindrical portion 80, to which a radially outwardly flared collar 82 shoots.
  • the collar forms an annular, inner contact surface 84, which can seal the sleeve member 78 against the intermediate member 46.
  • recesses 86 are provided, which are complementary to the recesses 74 forming material portions of the radially enlarged portion 32 of the nozzle body 30 are formed.
  • FIG. 6a a partially mounted hole nozzle 24 is shown, wherein the sleeve member 78 according to FIGS. 4b and 5b in the nozzle body 30 according to FIGS. 4b and 5b is mounted.
  • the radially outwardly widened region 32 of the nozzle body 30 has a radially inwardly facing cylindrical wall 88.
  • the cylindrical portion 80 of the sleeve member 78 has a radially outwardly facing wall 90.
  • the collar 82 of the sleeve member 78 has a wall 92 facing the annular bottom 72 of the nozzle body 30.
  • the walls 88, 90, 92 and the annular bottom 72 define a generally annular formed storage space 94 which is arranged concentrically to the nozzle needle space 34.
  • the nozzle needle space 34 is bounded along its course by the nozzle body 66 and the stepped portion 68 of the nozzle body 30 and by the cylindrical portion 80 of the sleeve member 78.
  • FIG. 6b is formed between the collar 22 and the radially expanded portion 32, a first, substantially cylindrical sealing portion 96. Further, between the cylindrical portion 80 and the nozzle body 30, another, designated 98 sealing region is formed. The sealing area 98 is created by the application of an annular rim 100 (cf. FIG. 5b ) of the sleeve member 78 with an inner portion 102 of the annular bottom 72 (see FIG. 5a ).
  • throttle elements 104 are formed by 78 provided in the cylindrical portion 80 of the sleeve member small material recesses are.
  • the storage space 94 has the following function: When the nozzle needle 36 is moved out of its nozzle needle seat 38 in the nozzle needle chamber 34 of a hole nozzle 24 according to the invention, high-pressure fuel from the nozzle needle chamber 34 into the combustion chamber 22 (cf. FIG. 1 ) are injected. When the nozzle needle 36 now moves back into the closed position, so that the nozzle needle seat 38 is closed, creates a pressure wave, which is transmitted through the applied fuel in the nozzle needle chamber 34. This pressure wave can be damped to a considerable extent by the fact that fuel flows from the nozzle needle chamber 34 via the throttle elements 104 into the storage space 94. In this case, 104 pressure can be reduced due to the throttling effect of the throttle elements, so that the maximum pressures of the pressure waves can be reduced and areas of the fuel injection system 10, which are acted upon by the fuel with the high pressure, are less heavily loaded.
  • the wall thickness of the extended portion 32 is reduced.
  • the wall thickness of the expanded portion 32 and the wall thickness of the nozzle body 66 are approximately equal.
  • the volume of the memory space 94 may, in an arrangement according to Figures 6a and 6b several hundred cubic millimeters.
  • FIG. 7 shows one to the hole nozzle 24 according to Figures 6a and 6b similar hole nozzle 24, which is characterized by the formation of the sealing area 96 of the in FIG. 6b distinguished embodiment.
  • the collar 22 of the sleeve member 78 according to FIG. 7 has an outer annular shoulder 106 pointing in the direction of the bottom 72 of the nozzle body 30. This annular shoulder 106 engages around an inner annular shoulder 108 formed on the widened area 32 of the nozzle body 30.
  • the annular shoulder 108 is pressed outwardly against the annular shoulder 106, so that the sealing effect of the sealing area 96 increases with increasing pressures in the storage space 94.
  • the sleeve member 78 and the nozzle body 30 have been connected to each other via a press fit formed in the respective seal portion 96.
  • the radially expanded portion 32 at its fuel injection device 18 end facing a radially inwardly facing annular collar 110.
  • On the cylindrical portion 80 of the sleeve member 78 is an outwardly facing, at least partially annular locking element 112 is arranged.
  • hole throttles 120 can also be provided for the hydraulic connection between the nozzle needle chamber 34 and the storage space 94, which are preferably arranged in the cylindrical section 80 of the sleeve element 78.
  • Such an alternative throttle arrangement can of course also in the embodiments according to FIGS. 4a to 7 be used.
  • hole throttles 120 has the advantage that the throttling effect can be set particularly well.

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

Claims (9)

  1. Injecteur à trous (24) pour un dispositif d'injection de carburant (18) d'un système d'injection de carburant (10), en particulier pour l'utilisation dans un système à rampe commune, comprenant un corps d'injecteur (30), qui présente un espace d'aiguille d'injecteur (34), et un espace de stockage (94) prévu pour stocker du carburant dans le corps d'injecteur (30), qui est connecté hydrauliquement par le biais d'au moins un élément d'étranglement (104, 120) à l'espace d'aiguille d'injecteur (34),
    caractérisé en ce que
    l'espace de stockage (94) est limité dans la direction radiale par une paroi (88) du corps d'injecteur (30) et par une paroi (90) d'un élément de douille (78) connecté au corps d'injecteur (30).
  2. Injecteur à trous selon la revendication 1, caractérisé en ce que l'espace de stockage (94) est disposé dans une région (32) du corps d'injecteur (30) qui est élargie radialement vers l'extérieur pour réaliser un épaulement du corps de buse (40).
  3. Injecteur à trous selon la revendication 1 ou 2, caractérisé en ce que l'espace de stockage (94) est réalisé sous forme annulaire et est disposé notamment concentriquement à l'espace d'aiguille d'injecteur (34).
  4. Injecteur à trous selon l'une quelconque des revendications précédentes, caractérisé en ce que la paroi (68) du corps d'injecteur (30) est disposée radialement à l'extérieur et la paroi (90) de l'élément de douille (78) est disposée radialement à l'intérieur.
  5. Injecteur à trous selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de douille (78) et le corps d'injecteur (30) sont connectés l'un à l'autre par le biais d'un ajustement serré.
  6. Injecteur à trous selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de douille (78) et le corps d'injecteur (30) sont connectés l'un à l'autre par engagement par encliquetage.
  7. Injecteur à trous selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une région d'étanchéité (96) est réalisée entre l'élément de douille (78) et le corps d'injecteur (30) de telle sorte que son effet d'étanchéité augmente en cas d'augmentation de la pression du carburant présent dans l'espace de stockage (94).
  8. Injecteur à trous selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément d'étranglement (104) est formé par deux composants différents espacés l'un de l'autre dans une région ayant un effet d'étranglement, notamment par le corps d'injecteur (30) et l'élément de douille (78).
  9. Dispositif d'injection de carburant (18) d'un système d'injection de carburant (10) comprenant un injecteur à trous (24) selon au moins l'une quelconque des revendications précédentes.
EP06120340A 2005-09-29 2006-09-08 Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant Not-in-force EP1770275B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005046669A DE102005046669A1 (de) 2005-09-29 2005-09-29 Lochdüse für eine Kraftstoff-Einspritzvorrichtung eines Kraftstoff-Einspritzsystem

Publications (2)

Publication Number Publication Date
EP1770275A1 EP1770275A1 (fr) 2007-04-04
EP1770275B1 true EP1770275B1 (fr) 2009-12-23

Family

ID=37533308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06120340A Not-in-force EP1770275B1 (fr) 2005-09-29 2006-09-08 Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1770275B1 (fr)
AT (1) ATE453049T1 (fr)
DE (2) DE102005046669A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006037179A1 (de) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Kraftstoffeinspritzsystem mit einem Druckschwingungsdämpfer
DE102006052636A1 (de) * 2006-11-08 2008-05-15 Robert Bosch Gmbh Düsenkörper mit Speicherbohrungen
DE102008012637A1 (de) * 2008-03-05 2009-09-10 Robert Bosch Gmbh Kraftstoffinjektor
EP2246552A1 (fr) * 2009-04-22 2010-11-03 Delphi Technologies Holding S.à.r.l. Injecteur de carburant
US9897058B2 (en) 2009-07-29 2018-02-20 Delphi International Operations S.A.R.L. Fuel injector
EP2295787B1 (fr) * 2009-07-29 2012-04-04 Delphi Technologies Holding S.à.r.l. Injecteur de carburant
DE102017123416A1 (de) * 2017-10-09 2019-04-11 Woodward L'orange Gmbh Kraftstoffinjektor sowie Einspritzsystem für eine Brennkraftmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10060811A1 (de) * 2000-12-07 2002-06-13 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE10121892A1 (de) * 2001-05-05 2002-11-07 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10246974A1 (de) * 2002-10-09 2004-04-22 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung für eine Brennkraftmaschine
FR2862352B1 (fr) * 2003-11-14 2006-02-24 Renault Sas Dispositif d'injection de carburant equipe de moyens d'amortissement d'ondes de pression

Also Published As

Publication number Publication date
ATE453049T1 (de) 2010-01-15
DE102005046669A1 (de) 2007-04-05
EP1770275A1 (fr) 2007-04-04
DE502006005720D1 (de) 2010-02-04

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