EP1770275A1 - 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
EP1770275A1
EP1770275A1 EP06120340A EP06120340A EP1770275A1 EP 1770275 A1 EP1770275 A1 EP 1770275A1 EP 06120340 A EP06120340 A EP 06120340A EP 06120340 A EP06120340 A EP 06120340A EP 1770275 A1 EP1770275 A1 EP 1770275A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
nozzle body
fuel injection
punch
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.)
Granted
Application number
EP06120340A
Other languages
German (de)
English (en)
Other versions
EP1770275B1 (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, with a nozzle body having a nozzle needle chamber.
  • Such a perforated nozzle is known for example from the book "Diesel Engine Management” Robert Bosch GmbH.
  • a fuel storage such as a "rail” fuel is brought to very high pressures.
  • Earlier common-rail systems have been designed for a maximum pressure of approx. 1350 bar.
  • Current common-rail systems operate at a maximum pressure of 1600 bar. For future applications, much higher pressures are desired.
  • the nozzle needle arranged in the hole nozzle acts as a valve during opening and closing, ie when lifted from an associated nozzle needle seat and when closing it. Due to the high pressures mentioned, starting from the valve needle acting as a valve body Pressure waves are generated, which may exceed the above maximum pressures. As a result, the fuel-carrying components of the common rail system are exposed to high load peaks.
  • 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 nozzle needle space and the storage space form independent hydraulic elements.
  • the perforated nozzle according to the invention is based on the idea that it is possible in a region of a fuel injection system to be able to use a material section oversized even when a maximum pressure is applied in order to relieve other regions of the fuel injection system that are spatially remote from this material section.
  • 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 as a whole carries the reference numeral 10. It comprises a fuel tank 12, from which a delivery system 14 delivers the fuel to a fuel rail 16 ("rail").
  • the conveyor system 14 may include a prefeed pump and a high pressure pump.
  • 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 injector 18 and the orifice nozzle 24 mounted thereon are shown in more detail in FIG.
  • the marked in Figure 2 section III is shown in Figure 3 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 retaining nut 44 is secured to the fuel injector 18 via a thread, not further shown in FIG. With the help of paragraph 42, the nozzle body shoulder 40 and thus the radially expanded portion 32 is pressed against a in Fig. 3 above the hole nozzle 24 shown intermediate member 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 hydraulically connected via a flow restrictor (not shown in FIG. 3) to a control chamber 54.
  • the control chamber 54 is essentially limited by the upper end of the nozzle needle 36 and the intermediate element 46 in FIG. 3.
  • An inlet throttle 56 which is supplied with fuel by means of a fuel inlet 58, opens into the control chamber 54.
  • the fuel inlet 58 is also hydraulically with the Düsennadelraum 34 connected. Between the valve 50 and the nozzle needle chamber 34, a further line 60 is provided.
  • the valve 50 In order to lift the nozzle needle 36 out of its nozzle needle seat 38, so that injection into the combustion chamber 22 shown in FIG. 1 can take place, the valve 50 is opened, so that fuel can flow out of 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), which bears sealingly against the intermediate element 46.
  • this sleeve member 64 is formed in Figure 3 as a helical spring spring member 62 from.
  • 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 show the nozzle body 30 of a hole nozzle 24 according to the invention.
  • 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 depressions 74 are offset from one another by a distance deviating from 180 ° in order to receive correspondingly arranged pins which are arranged in the intermediate element 46 according to FIG. 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.
  • FIGS. 4b and 5b show a sleeve element 78 which essentially has a hollow-cylindrical section 80, against which a collar 82 which widens radially outward is fired.
  • 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. 6 a shows a partially mounted hole nozzle 24, wherein the sleeve element 78 according to FIGS. 4 b and 5 b is mounted in the nozzle body 30 according to FIGS. 4 b and 5 b.
  • 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.
  • a first, essentially cylindrical sealing region 96 is formed between the collar 22 and the radially widened region 32. Further, between the cylindrical portion 80 and the nozzle body 30, another, designated 98 sealing region is formed. The sealing region 98 is formed by abutment of an annular rim 100 (see FIG. 5b) of the sleeve element 78 with an inner section 102 of the annular bottom 72 (see FIG. 5a).
  • the storage space 94 is sealed in the direction of the intermediate element 46 according to FIG.
  • 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: If the nozzle needle 36 is moved out of its nozzle needle seat 38 in the nozzle needle chamber 34 of a perforated nozzle 24 according to the invention, high-pressure fuel can be injected from the nozzle needle chamber 34 into the combustion chamber 22 (see FIG. 1). 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 area 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 storage space 94 may be several hundred cubic millimeters in an arrangement according to FIGS. 6a and 6b.
  • FIG. 7 shows a hole nozzle 24 similar to the hole nozzle 24 according to FIGS. 6 a and 6 b, which differs from the embodiment illustrated in FIG. 6 b due to the formation of the sealing region 96.
  • the collar 22 of the sleeve element 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.
  • 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 also be used in the embodiments according to FIGS. 4a to 7.
  • hole throttles 120 has the advantage that the throttling effect can be set particularly well.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
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 true EP1770275A1 (fr) 2007-04-04
EP1770275B1 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)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008017544A1 (fr) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Système d'injection de carburant avec un amortisseur de vibrations de pression
EP1921306A2 (fr) * 2006-11-08 2008-05-14 Robert Bosch Gmbh Corps d'injecteur doté d'un réservoir de carburant
EP2246552A1 (fr) * 2009-04-22 2010-11-03 Delphi Technologies Holding S.à.r.l. Injecteur de carburant
WO2011012519A1 (fr) * 2009-07-29 2011-02-03 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
WO2019072604A1 (fr) * 2017-10-09 2019-04-18 L'orange Gmbh Injecteur de carburant et système d'injection pour moteur à combustion interne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008012637A1 (de) * 2008-03-05 2009-09-10 Robert Bosch Gmbh Kraftstoffinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046602A1 (fr) * 2000-12-07 2002-06-13 Robert Bosch Gmbh Systeme d'injection de carburant pour moteurs a combustion interne
WO2002090755A1 (fr) * 2001-05-05 2002-11-14 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion
WO2004033890A1 (fr) * 2002-10-09 2004-04-22 Robert Bosch Gmbh Dispositif d'injection de carburant destine a un moteur a combustion interne
FR2862352A1 (fr) * 2003-11-14 2005-05-20 Renault Sas Dispositif d'injection de carburant equipe de moyens d'amortissement d'ondes de pression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046602A1 (fr) * 2000-12-07 2002-06-13 Robert Bosch Gmbh Systeme d'injection de carburant pour moteurs a combustion interne
WO2002090755A1 (fr) * 2001-05-05 2002-11-14 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion
WO2004033890A1 (fr) * 2002-10-09 2004-04-22 Robert Bosch Gmbh Dispositif d'injection de carburant destine a un moteur a combustion interne
FR2862352A1 (fr) * 2003-11-14 2005-05-20 Renault Sas Dispositif d'injection de carburant equipe de moyens d'amortissement d'ondes de pression

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008017544A1 (fr) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Système d'injection de carburant avec un amortisseur de vibrations de pression
EP1921306A2 (fr) * 2006-11-08 2008-05-14 Robert Bosch Gmbh Corps d'injecteur doté d'un réservoir de carburant
EP1921306A3 (fr) * 2006-11-08 2009-08-26 Robert Bosch Gmbh Corps d'injecteur doté d'un réservoir de carburant
EP2246552A1 (fr) * 2009-04-22 2010-11-03 Delphi Technologies Holding S.à.r.l. Injecteur de carburant
WO2011012519A1 (fr) * 2009-07-29 2011-02-03 Delphi Technologies Holding S.À.R.L. Injecteur de carburant
EP2295787A1 (fr) * 2009-07-29 2011-03-16 Delphi Technologies Holding S.à.r.l. Injecteur de carburant
US9279402B2 (en) 2009-07-29 2016-03-08 Delphi International Operations Luxembourg S.A.R.L. Fuel injector
US9897058B2 (en) 2009-07-29 2018-02-20 Delphi International Operations S.A.R.L. Fuel injector
WO2019072604A1 (fr) * 2017-10-09 2019-04-18 L'orange Gmbh Injecteur de carburant et système d'injection pour moteur à combustion interne

Also Published As

Publication number Publication date
EP1770275B1 (fr) 2009-12-23
DE102005046669A1 (de) 2007-04-05
ATE453049T1 (de) 2010-01-15
DE502006005720D1 (de) 2010-02-04

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