WO2004074677A1 - Injecteur pour injecter du carburant - Google Patents

Injecteur pour injecter du carburant Download PDF

Info

Publication number
WO2004074677A1
WO2004074677A1 PCT/EP2004/000905 EP2004000905W WO2004074677A1 WO 2004074677 A1 WO2004074677 A1 WO 2004074677A1 EP 2004000905 W EP2004000905 W EP 2004000905W WO 2004074677 A1 WO2004074677 A1 WO 2004074677A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
sealing seat
injector
nozzle
injector according
Prior art date
Application number
PCT/EP2004/000905
Other languages
German (de)
English (en)
Inventor
Robert Kuchler
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2004074677A1 publication Critical patent/WO2004074677A1/fr

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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the present invention relates to an injector for injecting fuel in an injection system of an internal combustion engine.
  • Injectors for injecting fuel are known in different configurations.
  • fuel injection is usually controlled by a nozzle needle, which is displaceably arranged in the injector and either releases or blocks a spray hole of the injector depending on its position.
  • the mechanical actuation of the nozzle needle can take place by means of a piezo actuator, the small stroke of which is e.g. is translated by a translator in order to be able to carry out a correspondingly larger stroke of the nozzle needle.
  • the nozzle needle is usually reset to its initial position by means of a spring element. Since the piezo actuators can only provide a small stroke or a small opening force, the stroke or the opening force is translated by means of a translator, particularly in the case of high-pressure injections. However, such translators are complex and costly and require additional space.
  • FIG. 6 shows a known injector with a two-part nozzle needle, which consists of an inner needle 1 and an outer needle 2.
  • the outer needle 2 has a sealing seat 5 and the inner needle has a sealing seat 8.
  • the needle opening forces required to open the two needles 1, 2 depend on the diameters Di and D 2 .
  • the needle opening forces F are shown in FIG. 7.
  • a needle opening force of approx. 2100 N (at R x ) is required to open the outer needle 2.
  • a needle opening force of approx. 500 N (for R 2 ) is necessary for the inner needle 1.
  • the stroke and the actuating force of a piezo actuator must be increased by means of a translator.
  • the injector according to the invention is constructed in such a way that a needle opening force is significantly less than in the prior art.
  • a nozzle needle arranged in a nozzle body has two separate needle seats for sealing.
  • a fuel under high pressure is on the one hand on one side of the first needle seat and on the other hand on one side of the second needle seat.
  • the first needle seat and the second needle seat each have a side on which fuel under high pressure is applied and a second side on which no high pressure is applied. It is thereby achieved that between the two needle seats there is an annular surface perpendicular to the direction of movement of the needle, which is determining for the needle opening force.
  • a through-channel is particularly preferably formed in the nozzle needle and / or in the nozzle body, so that the fuel under high pressure is also present on one side of the second needle seat through the nozzle needle or the nozzle body.
  • a spray hole is further preferably arranged in the nozzle body in such a way that it opens between the two needle seats of the nozzle needle.
  • the seat diameter of the respective needle seats can advantageously be increased by the design of the double needle seat, without the needle opening force or the pressure stage being increased thereby. This leads to a simultaneous enlargement of the spray hole level, so that a larger number of spray holes can be arranged adjacent to the enlarged seat diameter in a simple manner.
  • the nozzle needle is particularly preferably designed as a double needle with an outer needle and an inner needle which is guided in the outer needle.
  • the two needle seats are particularly preferably formed on the outer nozzle needle.
  • a double needle seat can also be formed on the outer and the inner needle or only a double needle seat on the inner nozzle needle.
  • a closing spring is preferably provided for the outer needle and for the inner needle.
  • the double needle can also be realized in a simple manner, a staggered or staggered opening of the two separate outer and inner needles, as a result of which, for example, a pre-injection and / or post-injection can be easily implemented.
  • the nozzle needle is particularly preferably operated by means of a piezo actuator in direct drive. This means that no translator is connected between the piezo actuator and the nozzle needle. As a result, a particularly compact and inexpensive construction of the injector can be achieved with the smallest installation space and low weight.
  • the distance between the first needle seat and the second needle seat is somewhat larger than a diameter of a spray hole arranged between the two needle seats.
  • a minimal circular area between the two needle seats, which determines the necessary opening force, is achieved.
  • the injector according to the invention is used in particular in common rail systems for injecting diesel fuel under the highest pressure in combustion chambers of engines. During operation, the pressures are around 1600 bar and above.
  • FIG. 1 shows a schematic sectional view of an injector according to a first exemplary embodiment of the present invention
  • FIG. 2 shows an enlarged view of area Y of FIG. 1
  • FIG. 3 shows an enlarged view of area Z from FIG. 1
  • FIG. 4 shows a diagram which shows the needle opening forces in the first exemplary embodiment
  • FIG. 5 shows a schematic partial sectional view of an injector according to a second exemplary embodiment of the present invention
  • Figure 6 is a schematic partial sectional view of an injector according to the prior art.
  • FIG. 7 shows a diagram of the needle opening forces for the injector shown in FIG. 6 according to the prior art.
  • the injector of the first exemplary embodiment is a so-called register nozzle, which comprises an inner needle 1, an outer needle 2 and a nozzle body 3.
  • the outer needle 2 is guided on a needle guide area 10 in the nozzle body 3.
  • the needle guide area is designed such that fuel can be supplied in the recessed areas of the outer needle in the direction of the needle tip via the fuel supply area 11 in a known manner.
  • the inner needle 1 is completely accommodated in the outer needle 2 and has a head region 1 a and a region 1 b of smaller diameter.
  • a piezo actuator (not shown) engages the outer needle 2 and moves the outer needle 2 upward when activated.
  • two springs 15, 16 are provided, the spring 15 closing the inner needle 1 and the spring 16 closing the outer needle 2.
  • the injection area of the injector is shown in more detail in FIG.
  • the inner needle 1 has only one sealing seat 8.
  • the outer needle 2 has two sealing seats 5, 6. Both the sealing seat 8 of the inner needle and the sealing seats 5, 6 of the outer needle are in a known manner in a tapered blind hole 13, so that in the ideal case there are circular-shaped seals.
  • a large number of spray holes 7, 9 are formed in the nozzle body 3, only two spray holes being drawn in FIG. 3 for ease of illustration.
  • the spray hole 7 is arranged such that it lies between the first sealing seat 5 and the second sealing seat 6. Thus, the spray hole 7 is released or closed by the outer needle 2.
  • the spray hole 9 is located near the tip of the blind hole 13 and is released or closed by the inner needle 1.
  • the end of the inner needle 1 is formed with the area 1b of smaller diameter (cf. FIG. 3).
  • fuel under high pressure is thus supplied from the fuel supply area 11 via the through bores 4 and over the cylindrical fuel supply area 12 formed between the area lb of smaller diameter and the outer needle 2 to the sealing seat 8 inner needle and the second sealing seat 6 of the outer needle. Fuel under high pressure is therefore at one
  • the circular annular surface K can be calculated by subtracting the circular area with the diameter D 2 of the second sealing seat 6 from the circular area with the diameter Di of the first sealing seat 5.
  • FIG. 4 shows the needle opening force F over the stroke s of the needles, the outer needle 2 touching the inner needle 1 at point Si (cf. FIG. 2).
  • the needle opening force for the outer needle 2 is approximately 450 N.
  • the needle opening force is in the state of the art for an injector with identical geometric dimensions but only one sealing seat 5 on the outer needle 2 approx. 2100 N (at Ri). This makes it clear that by providing two sealing seats on the outer needle 2, the needle opening force F can be reduced to a large extent. It is therefore also possible with the configuration according to the invention that a piezo actuator is used which lifts the needle 2 directly without using a complex translator which takes up space.
  • the needle opening force for the inner needle 1 is shown in FIG. 4 at point P 2 . Since only one sealing seat 8 is formed on the inner needle in the first exemplary embodiment, this force is the same as in the prior art (cf. FIG. 7, for R 2 ). It should be noted that, however, by appropriately forming two sealing seats on the inner needle 1, the needle opening force for this needle can also be reduced.
  • An injector according to a second exemplary embodiment of the invention is described below with reference to FIG. 5, the same or functionally identical parts being designated with the same reference numerals as in the first exemplary embodiment.
  • the needle 2 In contrast to the first embodiment, only one needle 2 is provided in the second embodiment.
  • the needle 2 likewise has two sealing seats 5, 6, spray holes 7 being arranged in the nozzle body 3 in the region between these sealing seats 5, 6.
  • Fuel under pressure is supplied via a bush-shaped fuel supply area 11 and bores 4 into a bore 14 and to the end of the blind hole 13.
  • fuel under pressure is present both on one side of the first sealing seat 5 and on one side of the second sealing seat 6.
  • this exemplary embodiment corresponds to the first exemplary embodiment, so that reference can be made to the description given there.
  • the invention thus makes use of the fact that when two needle seats are used on one needle, an annular surface that determines the needle opening force is present perpendicular to the direction of movement of the needle. Since the circular ring area is significantly smaller than the circular area relevant when only one needle seat is used according to the prior art, the opening force for the nozzle needle is also significantly reduced.
  • the damage volume both in single nozzles and in register nozzles can be independent of the geometry of the blind hole 13 be significantly reduced.
  • the damaged volume can only be found directly below the double sealing seat 5, 6, ie in the area of the circular ring surface K, so that the damaged volume can be determined by the geometry of the nozzle needle in the area between the first sealing seat 5 and the second sealing seat 6. This advantageously results in a further reduction in the emissions of the internal combustion engine.
  • the seat diameter can be increased by the double sealing seat, since the outer diameter of the sealing seat (first sealing seat 5) can be increased correspondingly with a predetermined needle opening force due to the reduced needle opening force F according to the invention. This results in an enlargement of the spray hole level, so that it is possible to accommodate very many spray holes in the area between the two sealing seats 5, 6 in a simple manner. This results in improved variation options for the arrangement of the spray holes.

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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)

Abstract

La présente invention concerne un injecteur pour injecter du carburant, comprenant un pointeau (2) qui est disposé dans un corps de pointeau (3), un système d'étanchéité se trouvant entre le pointeau (2) et le corps de pointeau (3), contre un premier (5) et un second (6) siège étanche. Du carburant haute pression est en contact avec un côté du premier siège étanche (5) et un côté du second siège étanche (6), ce qui permet de limiter la force d'ouverture de pointeau.
PCT/EP2004/000905 2003-02-18 2004-01-30 Injecteur pour injecter du carburant WO2004074677A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003106808 DE10306808A1 (de) 2003-02-18 2003-02-18 Injektor zum Einspritzen von Kraftstoff
DE10306808.2 2003-02-18

Publications (1)

Publication Number Publication Date
WO2004074677A1 true WO2004074677A1 (fr) 2004-09-02

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ID=32797494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/000905 WO2004074677A1 (fr) 2003-02-18 2004-01-30 Injecteur pour injecter du carburant

Country Status (2)

Country Link
DE (1) DE10306808A1 (fr)
WO (1) WO2004074677A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1566538A1 (fr) * 2004-02-20 2005-08-24 Delphi Technologies, Inc. Buse d'injection
EP1643117A1 (fr) * 2004-10-01 2006-04-05 Delphi Technologies, Inc. Buse d'injection
US7404526B2 (en) 2004-02-20 2008-07-29 Delphi Technologies, Inc. Injection nozzle
EP2071178A1 (fr) * 2007-12-10 2009-06-17 Delphi Technologies, Inc. Buse à injection

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1693561B1 (fr) 2005-01-19 2008-03-05 Delphi Technologies, Inc. Soupape d'injection de carburant
DE602005001261T2 (de) 2005-01-19 2008-01-31 Delphi Technologies, Inc., Troy Brennstoffeinspritzventil
DE602005024510D1 (de) 2005-03-04 2010-12-16 Delphi Tech Holding Sarl Einspritzdüse
DE102005037954A1 (de) * 2005-08-11 2007-02-15 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
US7578450B2 (en) 2005-08-25 2009-08-25 Caterpillar Inc. Fuel injector with grooved check member
US7360722B2 (en) 2005-08-25 2008-04-22 Caterpillar Inc. Fuel injector with grooved check member
JP5044556B2 (ja) * 2005-08-25 2012-10-10 キャタピラー インコーポレイテッド 溝付逆止部材を備えた燃料噴射器
EP2369166B1 (fr) * 2010-03-22 2017-12-13 Delphi International Operations Luxembourg S.à r.l. Buse à injection
CN106014738A (zh) * 2016-07-12 2016-10-12 江西汇尔油泵油嘴有限公司 阻隔式喷油方法及喷油嘴

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1560614A (en) * 1977-03-09 1980-02-06 Bosch Gmbh Robert Fuel injection nozzle
EP1063416A2 (fr) * 1999-06-25 2000-12-27 Delphi Technologies, Inc. Injecteur de carburant
US20030015599A1 (en) * 2001-07-19 2003-01-23 Carroll John T. Fuel injector with injection rate control
WO2003040543A1 (fr) * 2001-11-09 2003-05-15 Robert Bosch Gmbh Soupape d'injection de carburant pour des moteurs a combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1560614A (en) * 1977-03-09 1980-02-06 Bosch Gmbh Robert Fuel injection nozzle
EP1063416A2 (fr) * 1999-06-25 2000-12-27 Delphi Technologies, Inc. Injecteur de carburant
US20030015599A1 (en) * 2001-07-19 2003-01-23 Carroll John T. Fuel injector with injection rate control
WO2003040543A1 (fr) * 2001-11-09 2003-05-15 Robert Bosch Gmbh Soupape d'injection de carburant pour des moteurs a combustion interne

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1566538A1 (fr) * 2004-02-20 2005-08-24 Delphi Technologies, Inc. Buse d'injection
US7404526B2 (en) 2004-02-20 2008-07-29 Delphi Technologies, Inc. Injection nozzle
EP1643117A1 (fr) * 2004-10-01 2006-04-05 Delphi Technologies, Inc. Buse d'injection
US7523875B2 (en) 2004-10-01 2009-04-28 Delphi Technologies, Inc. Injection nozzle
EP2071178A1 (fr) * 2007-12-10 2009-06-17 Delphi Technologies, Inc. Buse à injection
US7789062B2 (en) 2007-12-10 2010-09-07 Delphi Technologies Holding S.Arl Injection nozzle

Also Published As

Publication number Publication date
DE10306808A1 (de) 2004-09-02

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