EP1256708A2 - Dispositif d'injection de carburant pour un moteur à combustion interne - Google Patents

Dispositif d'injection de carburant pour un moteur à combustion interne Download PDF

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Publication number
EP1256708A2
EP1256708A2 EP02010375A EP02010375A EP1256708A2 EP 1256708 A2 EP1256708 A2 EP 1256708A2 EP 02010375 A EP02010375 A EP 02010375A EP 02010375 A EP02010375 A EP 02010375A EP 1256708 A2 EP1256708 A2 EP 1256708A2
Authority
EP
European Patent Office
Prior art keywords
injection device
fuel injection
valve element
pressure
valve
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.)
Withdrawn
Application number
EP02010375A
Other languages
German (de)
English (en)
Other versions
EP1256708A3 (fr
Inventor
Peter Boehland
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 EP1256708A2 publication Critical patent/EP1256708A2/fr
Publication of EP1256708A3 publication Critical patent/EP1256708A3/fr
Withdrawn legal-status Critical Current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
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the present invention relates to a fuel injection device for internal combustion engines, with one elongated housing with a closed injection end, with one in the longitudinal direction of the housing extending recess, which with a fuel inlet is connectable with at least two axially from each other spaced outlet openings at the injection end, with at least two coaxial valve elements in the Recess are arranged and each of at least one Preload element against a corresponding valve seat in the Area of the outlet openings are applied, wherein the valve elements each have at least one pressure surface have, which delimits a pressure chamber and so aligned is that their pressurization is an axial movement of the corresponding valve element can cause.
  • Such a fuel injector is from the DE 40 23 223 A1 known.
  • a fuel injector shown for internal combustion engines Two Valve needles are arranged coaxially with one another. Both Valve needles are approximately half way up Printing area on.
  • the printing areas of the respective Valve needles are each with a flow channel connected by a hydraulic fluid, for example Fuel or oil that can flow to the pressure surface.
  • the Print areas are aligned so that with a Pressurizing the valve needles from each of them Lift off the assigned seat and thereby corresponding Open the outlet openings at the end of the injection nozzle. Via the two independent flow channels the valve needles can be controlled independently become.
  • the object of the present invention is a fuel injection device for internal combustion engines of the beginning the kind mentioned so that it builds easier, has smaller dimensions and overall cheaper is to be produced.
  • This task is accomplished with a fuel injector of the type mentioned above solved that the pressure rooms with a common Control channel are connected, and the opening pressure one valve element from that of another valve element different.
  • the printing surfaces each by at least one conical taper on the the valve seat facing end of a valve element are formed.
  • a conical taper especially with fuel injectors, which are designed as a seat hole nozzle, particularly simple to manufacture and deliver without additional complex Measures or processing steps a printing area whose Acting on an axial opening movement of the corresponding valve element leads.
  • the amount of fuel injected by the fuel injector dispensed fuel can on can be easily adjusted by setting the At least one fuel injector at the end of the injection two axially spaced rows from across the Scope of the injection end distributed outlet openings having. Depending on the number and size of the outlet openings becomes a more or less large amount of fuel of the fuel injector.
  • the setting of the opening pressure of one of the valve elements can by the biasing forces of the biasing elements happen. This is through continuing education Fuel injection device according to the invention expressed at which the preload forces of the Differentiate preload elements.
  • the size can also change the printing area of an element the size of Distinguish the pressure area of another valve element. This also results in different opening pressures of one valve element to another.
  • the biasing elements a Include coil spring and / or a gas spring.
  • Preload elements are simple and reliable in operation.
  • the outer valve element at its from the valve seat remote end is connected to a support ring on which that assigned to the outer valve element Prestressing element supports. This represents a reliable and easy to establish mechanical connection between Prestressing element and valve element.
  • the outside Valve element assigned in its Longitudinal direction has a through opening through which an end connected to the inner valve element Section runs through. This enables the Preload elements of the individual valve elements in axial Arranged one behind the other, which in turn the radial dimensions of the fuel injection devices according to the invention lowers.
  • Fuel injector will reduce suggested that at least the housing and the Preload elements identical to the housing and the Biasing elements of a conventional fuel injector which are just a valve element includes.
  • a fuel injection device carries in Figure 1 overall reference number 10.
  • the fuel injector 10 is used to inject Fuel in the combustion chamber of an internal combustion engine.
  • Fuel is petrol or diesel.
  • the assembly can be done directly on the internal combustion engine. it includes an elongated housing 11, which consists of an upper Base section 12, a nozzle body 14 and one Connection sleeve 16 is made.
  • the base section 12 is from a step-shaped longitudinal bore 18 passes through.
  • in the Nozzle body 14 is a blind hole 20, which is from the upper edge of the nozzle body 14 to one in the Figures 1 to 4 provided at the bottom of the injection cap 22 extends.
  • the injection tip 22 is down closed and has two axially spaced apart Rows of outlet openings 24 distributed over the circumference or 26 on.
  • the intermediate piece 28 there is also a step-shaped one Through opening 30 available.
  • the longitudinal bore 18 in Base section 12, the blind hole 20 in the nozzle body 14 and the through opening 30 in the intermediate piece 28 are aligned Installation position with each other.
  • the base section 12 and that Intermediate piece 28 are from a flow channel 32nd enforces itself in the nozzle body 14 up to one annulus-like pressure chamber 34 in the blind hole 20 of the Nozzle body 14 continues.
  • valve element 36 In the blind hole 20 of the nozzle body 14 there is first a exterior provided with a continuous longitudinal bore Valve element 36 arranged.
  • Valve element 36 In the longitudinal hole (without Reference numeral) in the outer valve element 36 is an inner one Valve element 38 introduced.
  • the two valve elements 36 and 38 are arranged coaxially with each other.
  • At his the Injection cap 22 facing the end Valve element 36 has a conical taper through which an annular pressure surface 40 is formed.
  • a pressure space 41 is located upstream from the printing surface 40 available.
  • Fuel injector 10 faces the lower end of the inner valve member 38 over the lower end of the outer valve element 36 over.
  • a conical one Taper is present, which forms a pressure surface 46.
  • Below the pressure surface 46 there is also a sealing edge 48 provided with a valve seat on the inner wall of the Blind holes 20 cooperates in the nozzle body 14.
  • a pressure space 47 is located upstream from the pressure surface 46 available.
  • the valve seat for the sealing edge 48 is in the axial Direction seen between the lower injection openings 26 and the upper injection ports 24. Let it be on this Pointed out that in the resting position of the Fuel injector 10, the sealing edges 44 and 48 rest on the respective valve seats. Out For reasons of illustration, a gap between the Sealing edges 44 and 48 and the respective valve seats shown.
  • an intermediate ring 56 is supported, on which in turn a helical compression spring 58 is supported.
  • the other end is supported on a clamping piece 60, which in the Longitudinal bore 18 in the base section 12 approximately on the latter half way up.
  • a clamping piece 60 which in the Longitudinal bore 18 in the base section 12 approximately on the latter half way up.
  • a paragraph 62 is formed between section 52 and section 54 of the Translator piece 50.
  • the stepped bore 30 shows Intermediate piece 28 has a shoulder 64 to 4 and in particular shown in Figure 2 idle state the fuel injector 10 in which the Sealing edge 44 of the outer valve element 36 den touches the corresponding valve seat on the nozzle body between paragraph 62 on translator piece 50 and level 64 at the intermediate piece 28 there is a gap, the size S1 is.
  • the maximum stroke of the outer valve element is therefore also S1.
  • the translator piece 50 is also a step trained through hole 66 present.
  • the stage this bore 66 has the reference number 67.
  • the inner Valve element 38 protrudes around one with its upper end Distance S2 over the upper end of the outer valve element 36 over and something in the larger diameter section the through hole 66 in the translator piece 50.
  • a booster piston 70 At the upper end of the inner valve element 38 lies with a disk-shaped end section 68, a booster piston 70 on.
  • the translation piston 70 extends through the Through hole 66 in the translator 70, the recess in the intermediate ring 56 and a recess (without reference numerals) in the clamping piece 60.
  • a support plate 72 on the booster piston 70 attached to one end of a helical Compression spring 74 supports.
  • the other end of the coil spring 74 is based on a paragraph (without reference numerals) of the Longitudinal bore 18 in the base section 12.
  • Fuel injector 10 is the end portion 68 of the booster piston 70 is not yet at the stage 67 between the larger section Diameter and the smaller diameter section of the Through hole 66 is formed in the translator piece 50.
  • the distance S2 is also in said idle state slightly larger than the distance S1. That way ensures that when opening the outer Valve element 36 this not at the end section 68 of the Translator piston 70 stops. Otherwise, this would be too an unwanted relief of the inner valve element 38 to lead.
  • the shoulder 64 and the shoulder 62 thus form one Stop for the opening movement of the outer Valve element 36.
  • the fuel injection device shown in Figures 1 to 4 10 is operated as follows: In Idle state, that is, in that state of the fuel injection device 10 by taking no fuel from this is released, the sealing edges 44 and 48 of the outer valve element 36 or inner valve element 38 sealing on the respective valve seats on the inside of the blind hole 20 in the area of the injection tip 22. The in the annular space between the outer valve element 36 and the blind hole 20 in the nozzle body 14 existing fuel can therefore not via the injection openings 24 and 26 escape.
  • a pressure pulse generated which extends through the flow channel 32 to Pressure chamber 34 and the annular space between the outer Valve element 36 and the blind hole 20 in the nozzle body 14 continues. From there the pressure pulse reaches the Pressure chamber 41. The level of the pressure pulse is so dimensioned that on the printing surfaces 40 and 42 of the outer valve element 36 resulting axial force to a Opening movement of the outer valve element 36 leads. As a result, the sealing edge 44 of the outer valve element lifts 36 from the corresponding valve seat, so that fuel via the injection openings 24 from the fuel injection device 10 can be delivered.
  • the pressure of the pressure wave is so low that that inner valve element 38 does not open. This will do so causes on the one hand the pressure surface 46 on the inside Valve element 38 is smaller than the sum of the pressure areas 40 and 42 of the outer valve element 36. On the other hand but also by a stronger spring preload Compression spring 74 reached in comparison to the compression spring 58. To At the end of the pressure pulse, the pressure in the pressure chamber 34 drops and in the pressure chamber 41 again, so that the outer Valve element 36 due to the bias by the Coil spring 58 moved back down and the Sealing edge 44 in contact with the corresponding valve seat arrives.
  • the level of the pressure pulse is chosen so that the on the pressure surface 46 of the inner valve element 38 resulting axial force is greater than the closing force of the Compression spring 74. This leads to an opening movement of the inner valve member 38 through which the injection ports 26 are ultimately connected to the flow channel 32. Through the injection openings 24 and the injection openings 26 can now fuel from the fuel injector 10 exit.
  • the opening movement of the outer valve element 36 will thereby by the between the translator 50 and the Intermediate piece 28 formed stop 62 and 64 limited.
  • the opening path of the outer valve element 36 is maximum S1.
  • the opening movement of the inner valve element 38 is by the between the end portion 68 of Translator piston 70 and level 67 in translator piece 50 formed stop limited.
  • the opening path of the interior Valve element is also a maximum of approximately S1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02010375A 2001-05-09 2002-05-08 Dispositif d'injection de carburant pour un moteur à combustion interne Withdrawn EP1256708A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10122389 2001-05-09
DE2001122389 DE10122389A1 (de) 2001-05-09 2001-05-09 Kraftstoff-Einspritzvorrichtung für Brennkraftmaschinen

Publications (2)

Publication Number Publication Date
EP1256708A2 true EP1256708A2 (fr) 2002-11-13
EP1256708A3 EP1256708A3 (fr) 2004-01-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02010375A Withdrawn EP1256708A3 (fr) 2001-05-09 2002-05-08 Dispositif d'injection de carburant pour un moteur à combustion interne

Country Status (2)

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EP (1) EP1256708A3 (fr)
DE (1) DE10122389A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005026531A1 (fr) * 2003-09-10 2005-03-24 Siemens Aktiengesellschaft Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322826A1 (de) * 2003-05-19 2004-12-09 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
RU2451820C1 (ru) * 2010-10-05 2012-05-27 Открытое акционерное общество холдинговая компания "Коломенский завод" Форсунка для двигателя внутреннего сгорания
RU173353U1 (ru) * 2016-04-27 2017-08-23 Дмитрий Михайлович Вохмин Распылитель форсунки для одноциклового трёхфазного впрыска топлива

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE926643C (de) * 1952-05-21 1955-04-21 Friedrich Wilhelm Deckel Dipl Einspritzduese
DE2710138A1 (de) * 1977-03-09 1978-09-14 Maschf Augsburg Nuernberg Ag Mehrloch-einspritzduese
DE2711393A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE4023223A1 (de) * 1990-07-21 1992-01-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE10038054A1 (de) * 1999-08-05 2001-02-15 Avl List Gmbh Nockenbetätigte Einspritzeinrichtung für eine Brennkraftmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4210563A1 (de) * 1991-04-15 1992-10-22 Volkswagen Ag Kraftstoffeinspritzduese fuer eine mit vor- und haupteinspritzung arbeitende brennkraftmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE926643C (de) * 1952-05-21 1955-04-21 Friedrich Wilhelm Deckel Dipl Einspritzduese
DE2710138A1 (de) * 1977-03-09 1978-09-14 Maschf Augsburg Nuernberg Ag Mehrloch-einspritzduese
DE2711393A1 (de) * 1977-03-16 1978-09-21 Bosch Gmbh Robert Kraftstoffeinspritzduese
DE4023223A1 (de) * 1990-07-21 1992-01-23 Bosch Gmbh Robert Kraftstoff-einspritzduese fuer brennkraftmaschinen
DE10038054A1 (de) * 1999-08-05 2001-02-15 Avl List Gmbh Nockenbetätigte Einspritzeinrichtung für eine Brennkraftmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005026531A1 (fr) * 2003-09-10 2005-03-24 Siemens Aktiengesellschaft Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne

Also Published As

Publication number Publication date
EP1256708A3 (fr) 2004-01-14
DE10122389A1 (de) 2002-11-21

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