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WO2011160991A1 - Injecteur, en particulier injecteur pour rampe commune, et système d'injection de carburant présentant un injecteur - Google Patents

Injecteur, en particulier injecteur pour rampe commune, et système d'injection de carburant présentant un injecteur Download PDF

Info

Publication number
WO2011160991A1
WO2011160991A1 PCT/EP2011/059962 EP2011059962W WO2011160991A1 WO 2011160991 A1 WO2011160991 A1 WO 2011160991A1 EP 2011059962 W EP2011059962 W EP 2011059962W WO 2011160991 A1 WO2011160991 A1 WO 2011160991A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve needle
nozzle body
injector
region
groove
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.)
Ceased
Application number
PCT/EP2011/059962
Other languages
German (de)
English (en)
Inventor
Armin Schuelke
Olaf Ohlhafer
Hubert Greif
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 WO2011160991A1 publication Critical patent/WO2011160991A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
    • 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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1893—Details of valve member ends not covered by groups F02M61/1866 - F02M61/188

Definitions

  • Injector in particular common-rail injector, as well as fuel injection system with an injector
  • the invention relates to an injector, in particular common-rail injector, according to the preamble of claim 1.
  • the invention further comprises a fuel injection system with an injector according to the invention.
  • Such an injector is already known from DE 27 10 217 A1 of the Applicant.
  • at least one injection opening of the nozzle body is sealed in a closed position of the valve needle by a conical sealing seat region, which is produced by wall sections of a valve needle and a nozzle body which have the same pitch.
  • a connection between a high-pressure space in the nozzle body and a blind hole, which is located below the spray openings in the nozzle body is formed.
  • the connection is in this case generated by two holes which are formed in the valve needle, wherein the one bore is formed as a longitudinal bore in the longitudinal axis of the valve needle and the other bore as opening into the longitudinal bore transverse bore.
  • an injector is furthermore known whose valve needle or nozzle body has longitudinal grooves in the region of the injection openings which open below a linear sealing seat in an annular circumferential annular groove.
  • a connection of the blind hole with the pressure chamber with closed valve needle is not disclosed. Disclosure of the invention
  • the present invention seeks to further develop an injector, in particular common rail injector according to the preamble of claim 1 such that its connection between the pressure chamber and the blind hole is optimized in particular in the closed position of the valve needle ,
  • This object is achieved in an injector with the features of claim 1.
  • the connection as at least one groove, which is arranged on the lateral surface of at least the sealing portion of the valve needle or on the wall of the nozzle body, the flow properties are optimized at the injector, so that when closing the valve needle, i. when forming the sealing seat that already under the pressure of the pressure chamber standing, and further compressed by the closing movement of pressure medium can flow very quickly into the pressure chamber or takes place very quickly pressure equalization between the blind hole and the pressure chamber.
  • the closing movement of the valve needle is accelerated in a positive manner.
  • to open the valve needle in the blind hole already acting in the direction of the opening pressure of the pressure chamber so that the opening forces for the valve needle are relatively low.
  • the at least one groove is formed as a longitudinal groove.
  • a plurality of injection openings and a plurality of grooves are provided, that the plurality of injection openings and a plurality of grooves are arranged at respectively equal angular distances from one another and that a groove is arranged at least substantially centrally between two injection openings.
  • a groove is arranged at least substantially centrally between two injection openings.
  • the at least one groove is rounded in cross section, in particular in the form of a semicircle.
  • the sealing seat in the region of the at least one injection opening can be formed in a particularly simple or production-wise advantageous manner if the wall region of the nozzle body facing the valve needle is conical in the region of the at least one injection opening and if the sealing section of the valve needle is likewise conical in the region of the at least one injection opening is formed with the same slope.
  • these surfaces can be produced very precisely, in particular by grinding, and can be joined in pairs, so that a high sealing effect is achieved.
  • the at least one groove is produced by a non-cutting production method, in particular an embossing method.
  • a non-cutting production method in particular an embossing method.
  • the invention also includes a fuel injection system with an injector according to the invention.
  • a fuel injection system achieved by the high sealing effect of its injectors and their ability to implement closing movements particularly accurate and fast, very good emissions.
  • FIG. 2 shows the injector of FIG. 1 in an open position also in longitudinal section
  • Fig. 3 shows the lower portion of a second injector according to the invention in an open position in longitudinal section
  • Fig. 4 is a perspective view of a portion of a punch for forming grooves in the wall of a nozzle body.
  • FIGS. 1 and 2 show a first injector 10 according to the invention.
  • the injector 10 is in this case in particular part of a so-called common rail injection system, in which a plurality of similar injectors, which are each associated with a combustion chamber of a cylinder of an internal combustion engine, are connected to a common rail via which the individual injectors under pressure, in particular be supplied under system pressure, stagnant fuel. Since the general structure and mode of operation of such an injector 10 or such a common rail injection system is already generally known and not essential to the invention, the injector 10 will be described below only in the area essential to the invention on its side facing the combustion chamber.
  • the injector 10 has a nozzle body 11, the region of which shown in FIGS. 1 and 2 has a cylindrical bore section 12, which merges into a first, conical bore section 14 via a transitional region 13.
  • a second bore portion 15 in the form of a conical blind hole 16, wherein in the illustrated embodiment, the pitch angle oc 1, based on the longitudinal axis 17 of the nozzle body 1 1 is less than the angle oc 2 of the first bore portion 14.
  • An the second bore section 15 facing end of the first bore portion 14 a plurality, in particular at equal angular intervals to each other, at a slight angle to the horizontal inclined arranged injection ports 19 are formed in the form of through holes.
  • the injection ports 19 open in the installed state of the injector 10 in the combustion chamber of the (not shown) internal combustion engine and serve to inject the desired amount of fuel into the combustion chamber.
  • the injection openings 19 can be closed by means of a valve needle 20.
  • the pin-shaped valve needle 20 which can be moved up and down in the direction of the double arrow 21, is actuated against the spring force of a closing spring (not shown) and against the applied hydraulic forces by a magnet armature arrangement or by a piezo arrangement in a manner known per se, so that in the de-energized state of the magnet armature arrangement or the piezoelectric arrangement, ie 2, the injection ports 19 are closed by the valve needle 20, while in the open position of the valve needle 20 shown in FIG. 2, a passage in particular from the cylindrical bore portion 12 which a pressure chamber 23 with high pressure forms standing fuel, and the injection ports 19 is formed.
  • the valve needle 20 has an upper, cylindrical portion 24, which merges into a first, frusto-conical portion 25, whose pitch corresponds in the embodiment of the slope oc 2 of the first bore portion 14.
  • the first frusto-conical portion 25 is adjoined by a relatively short cylindrical portion 26, and in turn a second frustoconical portion 27, also exemplarily with a cone angle oc 2.
  • a flat sealing portion 30 is formed on the valve needle 20, which seals the spray openings 19.
  • the area of the blind bore 16 below the valve needle 20 is connected to the area above the spray openings 19, ie in particular the cylindrical bore section 12 or the pressure chamber 23.
  • the cross section of the longitudinal grooves 31 is in this case in particular rounded, preferably in the form of a semicircle formed.
  • the arrangement of the longitudinal grooves 31 is such that in the closed position of the valve needle 20 shown in FIG. 1, a longitudinal groove 31 is at least substantially centrally between two spray openings 19, so that the sealing surfaces of the sealing portion 30 in the region of the spray openings 19 respectively are the same size.
  • valve needle 20 is arranged in the nozzle body 1 1 in the longitudinal axis 17 rotatably, thus avoiding that one or more longitudinal grooves 31 overlap with the injection ports 19 and the injector 10 in the closed position of the valve needle 20 thus is leaking.
  • the longitudinal grooves 31 are formed on the entire lateral surface of the second conical portion 27 and on a part of the cylindrical portion 24 of the valve needle 20.
  • the bottom 32 of the valve needle 20 is exemplary and therefore not restrictive substantially horizontal or slightly convex.
  • modified injector according to the invention according to the invention
  • the valve needle 51 has a conical sealing portion 52, which serves to seal the spray openings 19a, and a relatively pointed trained lower end 53.
  • the valve needle 51 may be arranged rotatably in contrast to the valve needle 20 in its longitudinal axis.
  • the nozzle body 54 has an inclined sealing area 55 in the wall of the nozzle body 54, the inclination of which is adapted to the inclination of the sealing section 52 of the valve needle 51.
  • longitudinal grooves 56 are preferably formed at equal angular intervals between the injection openings 19a, which connect the pressure space 23a to the area of the blind hole 16a.
  • Such longitudinal grooves 56 can be produced without cutting by means of an embossing tool 58 shown in FIG. 4, wherein the embossing tool 58 has in its conical region 59 the formation of the longitudinal grooves 56 serving longitudinal projections 60.
  • the longitudinal grooves 56 are formed by the embossing tool 58 in that the latter is introduced into the nozzle body 54 and subjected to such an axial force that the longitudinal elevations 60 are impressed in the wall of the nozzle body 54.
  • the injectors 10 and 50 described so far can be modified or modified in many ways without departing from the spirit of the invention.
  • the longitudinal grooves 56, 31 are formed both in the valve needle 20 and in the sealing region 55 of the nozzle body 54.

Landscapes

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

Abstract

L'invention concerne un injecteur (10; 50), en particulier un injecteur pour rampe commune, pour un moteur à combustion interne, comprenant un pointeau de soupape (20; 51) présentant une section d'étanchéité (30; 52) et qui est disposé, mobile montant-descendant, dans un corps de buse (11; 54), le corps de buse (11; 54) présentant au moins un orifice d'injection, et de préférence plusieurs orifices d'injection (19; 19a) qui, en position de fermeture du pointeau de soupape (20; 51), sont obturés vis-à-vis d'un espace de pression (23; 23a) dans le corps de buse (11; 54) et qui, en position d'ouverture du pointeau de soupape (20; 51), sont en liaison avec ledit espace de pression (23; 23a), la section d'étanchéité (30; 52) formant, en position de fermeture du pointeau de soupape (20; 51), au moins dans la zone d'au moins un orifice d'injection (19, 19a), une surface plane d'appui au corps de buse (11; 54), et obturant ainsi la zone d'au moins un orifice d'injection (19; 19a), et établissant une liaison entre l'espace de pression (23; 23a) et un trou borgne (16; 16a) formé à la base du corps de buse (11; 54). L'invention est caractérisée en ce que la liaison est réalisée sous la forme d'au moins une rainure (31; 56) qui est disposée sur la surface latérale d'au moins la section d'étanchéité (30) du pointeau de soupape (20), ou sur la paroi du corps de buse (54).
PCT/EP2011/059962 2010-06-22 2011-06-15 Injecteur, en particulier injecteur pour rampe commune, et système d'injection de carburant présentant un injecteur Ceased WO2011160991A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010030344 DE102010030344A1 (de) 2010-06-22 2010-06-22 Injektor, insbesondere Common-Rail-Injektor, sowie Kraftstoffeinspritzsystem mit einem Injektor
DE102010030344.5 2010-06-22

Publications (1)

Publication Number Publication Date
WO2011160991A1 true WO2011160991A1 (fr) 2011-12-29

Family

ID=44247950

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/059962 Ceased WO2011160991A1 (fr) 2010-06-22 2011-06-15 Injecteur, en particulier injecteur pour rampe commune, et système d'injection de carburant présentant un injecteur

Country Status (2)

Country Link
DE (1) DE102010030344A1 (fr)
WO (1) WO2011160991A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012085901A2 (fr) * 2011-05-09 2012-06-28 Lietuvietis Vilis I Canal d'égalisation de pression à trous recouverts par aiguille
CN103382913A (zh) * 2013-03-22 2013-11-06 哈尔滨工程大学 一种复合式旋转喷油嘴
DE102014218056A1 (de) * 2014-09-10 2016-03-10 Robert Bosch Gmbh Brennstoffeinspritzventil
JP2016205197A (ja) 2015-04-21 2016-12-08 日立オートモティブシステムズ株式会社 燃料噴射装置
GB2551169B (en) * 2016-06-08 2019-12-25 Delphi Tech Ip Ltd Fuel injector nozzle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB240336A (en) * 1924-12-19 1925-10-01 Vickers Ltd Improvements in or relating to fuel spray valves
DE2710217A1 (de) 1977-03-09 1978-09-14 Bosch Gmbh Robert Kraftstoffeinspritzduese
EP1041274A1 (fr) * 1998-10-09 2000-10-04 Jun Arimoto Valve d'injection de carburant pour moteur diesel
WO2004031570A1 (fr) * 2002-09-27 2004-04-15 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
EP1496246A1 (fr) * 2003-07-07 2005-01-12 Delphi Technologies, Inc. Buse d'injection
EP1528251A1 (fr) * 2003-10-30 2005-05-04 Robert Bosch Gmbh Injecteur avec des structures pour limiter les changements des caractéristiques d'ouverture dûs à l'usure
DE102005039205A1 (de) * 2005-08-18 2007-02-22 Siemens Ag Düsenbaugruppe für ein Einspritzventil

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB240336A (en) * 1924-12-19 1925-10-01 Vickers Ltd Improvements in or relating to fuel spray valves
DE2710217A1 (de) 1977-03-09 1978-09-14 Bosch Gmbh Robert Kraftstoffeinspritzduese
EP1041274A1 (fr) * 1998-10-09 2000-10-04 Jun Arimoto Valve d'injection de carburant pour moteur diesel
WO2004031570A1 (fr) * 2002-09-27 2004-04-15 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
EP1546547B1 (fr) 2002-09-27 2006-11-22 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
EP1496246A1 (fr) * 2003-07-07 2005-01-12 Delphi Technologies, Inc. Buse d'injection
EP1528251A1 (fr) * 2003-10-30 2005-05-04 Robert Bosch Gmbh Injecteur avec des structures pour limiter les changements des caractéristiques d'ouverture dûs à l'usure
DE102005039205A1 (de) * 2005-08-18 2007-02-22 Siemens Ag Düsenbaugruppe für ein Einspritzventil

Also Published As

Publication number Publication date
DE102010030344A1 (de) 2011-12-22

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