EP2486265A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP2486265A1
EP2486265A1 EP10762627A EP10762627A EP2486265A1 EP 2486265 A1 EP2486265 A1 EP 2486265A1 EP 10762627 A EP10762627 A EP 10762627A EP 10762627 A EP10762627 A EP 10762627A EP 2486265 A1 EP2486265 A1 EP 2486265A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
valve
fuel
injection valve
valve element
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Withdrawn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
EP10762627A
Other languages
German (de)
English (en)
Inventor
Roman Etlender
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 EP2486265A1 publication Critical patent/EP2486265A1/fr
Withdrawn legal-status Critical Current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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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

Definitions

  • the invention relates to a fuel injection valve according to the preamble of claim 1.
  • Such a fuel injection valve is already known and is used in particular in so-called “common rail systems" in diesel internal combustion engines for metering the fuel into the combustion chambers of the internal combustion engine
  • the end of the injector element opposite the at least one fuel outlet channel is guided in a valve element, the end of which facing the at least one fuel outlet channel is formed in the shape of a sleeve.
  • a high-pressure storage space for fuel is in the injector housing He who has the at least one fuel outlet channel connection.
  • the present invention seeks to further develop a fuel injection valve according to the preamble of claim 1 such that its pressure fluctuations are reduced, without causing disadvantages in terms of dosing accuracy or other valve properties.
  • This object is achieved with a fuel injection valve having the features of claim 1.
  • the invention is based on the idea of arranging the transition region of the injector element from the first region within the valve element in which it has a relatively large diameter to the relatively smaller diameter within the valve element by means of a valve element that is longer than the prior art. It has been found that the pressure fluctuations can be reduced by this measure, without resulting in disadvantages with respect to the metering accuracy of the fuel or other valve properties.
  • a partial region of the second section of the injection nozzle element adjoins the transition region within the valve element.
  • valve element is integrally formed.
  • valve element is formed in two parts and has a sleeve-shaped extension element on the control chamber opposite side.
  • connection between the two parts of the valve element can be designed constructively by the extension element is designed as a slip-on, which is connected by a, in particular material or non-positive connection, in particular via a peripheral edge, with the valve element.
  • the injector housing for receiving the injector element has a recess with at least two regions that the injector element in addition to its leadership in the valve element is guided in the smaller diameter portion of the recess, that in the region of the recess is formed a substantially limited by the injector element and the valve element high-pressure storage space for fuel and that the volume of the high pressure accumulator space is kept constant by the larger diameter portion of the recess in comparison with a fuel injection valve, in which the transition region is arranged in the region of the end of the valve element opposite the control chamber, by the length of the transition region projecting beyond Section of the valve element is formed extended.
  • FIG. 1 shows a fuel injection valve according to the invention in a simplified longitudinal section
  • Fig. 2 a detail of the fuel injection valve according to FIG. 1 in the region of the extension of the valve piece in a comparison with FIG. 1 modified, two-piece valve piece.
  • a fuel injection system carries the reference numeral 1 in FIG. 1 as a whole.
  • the fuel injection system 1 has a fuel injection valve 10 for each of the cylinders of an internal combustion engine.
  • fuel injection valve 10 By means of the fuel injection valve 10, fuel is injected directly into an associated but not shown combustion chamber of the internal combustion engine.
  • the fuel injection valve 10 has a high-pressure port 12, which is connected to a pressure accumulator 13 ("rail") in which fuel is stored under high pressure, for example about 2000 bar.
  • the fuel injection valve 10 has an injector housing 14, in whose longitudinal axis a recess 15 is formed.
  • the recess 15 is divided into at least two sections 16, 17, wherein the first section 16 has a larger diameter than the second section 17.
  • designed as an injection nozzle element nozzle needle 20 is arranged.
  • a sealing edge 21 is present on the nozzle needle 20, which cooperates with a housing-side injection valve seat 22.
  • fuel is discharged from the fuel injection valve 10 via at least one fuel outlet channel 23 into the combustion chamber of the internal combustion engine or such delivery is prevented.
  • a high-pressure accumulator space 24 is formed in the recess 15, said accumulator chamber being arranged above in the injector housing 14. formed axial channels 25 and the high-pressure port 12, the fuel injection valve 10 in the region of the Einsspritzventilsitzes 22 supplied with fuel.
  • the nozzle needle 20 has in the embodiment at least two sections 26 and 27.
  • the reference numeral 26 denotes a first portion, which is arranged on the sealing edge 21 opposite side of the nozzle needle 20 and has a larger diameter than the adjoining thereto via an intermediate portion 29 second portion 27.
  • the intermediate portion 29 is preferably inclined or conical educated.
  • the first portion 26 of the nozzle needle 20 is fluid-tight, but in sliding fit, guided in a valve member designed as a valve member 30, which closes the high-pressure accumulator space 24 upwards.
  • the valve piece 30 has a sleeve-shaped region 31 in the region of the receptacle of the first section 26 of the nozzle needle 20.
  • the sleeve-shaped portion 31 is formed extended in the direction of the second portion 27 of the recess 15 such that at least the intermediate portion 29 of the nozzle needle 20 is located within the sleeve-shaped portion 31.
  • an embodiment of the sleeve-shaped region 31 is preferred, in which the latter is extended by a length L 2 (including the intermediate section 29), the length ratio L 2 / L- 1 being: wherein L 2 / L- ⁇ is particularly preferably 1 / 4.15, and wherein L- ⁇ as the length from
  • Beginning of the intermediate portion 29 is defined to the beginning of the second portion 17 of the recess 15.
  • the inner diameter d 2 of the sleeve-shaped portion 31 should be more than 50% of the diameter di of the first portion 16 of the recess
  • the extension of the sleeve-shaped region 31 beyond the intermediate section 29 is either characterized by a one-piece valve piece 30, or else correspondingly 2 may be formed by a slip-on sleeve 33, which is connected to the end portion of the valve member 30, for example by a peripheral edge 38 by clamping, or in any other way positively or materially connected to the valve member 30, so that the valve member 30th is formed in two parts.
  • the larger-diameter portion 16 of the recess 15 is formed extended by the length by which the valve piece 30 with its sleeve-shaped portion 31 projects beyond the intermediate portion 29, so that the volume of the High-pressure accumulator 24 is unchanged compared to a conventional fuel injection valve.
  • the upper end face of the nozzle needle 20 in FIG. 1 forms a hydraulic control surface 32, which delimits a hydraulic control chamber 34 in the valve piece 30.
  • a compression spring 37 is arranged under bias, the force is applied to the nozzle needle 20 in the closing direction against the injection valve seat 22.
  • the pressure in the hydraulic control chamber 34 is influenced by the position of an electromagnetic control valve 40.
  • the latter has a control valve element 41 designed as a valve piston, which is guided in the valve piece 30.
  • an armature 42 is attached to the control valve element 41, wherein in an exemplary embodiment, not illustrated, the control valve 40 and the armature 42 may also be made in one piece.
  • the armature 42 cooperates with an electromagnetic coil 43.
  • the control valve element 41 is acted upon by a valve spring 44 in its closed position. In this, it lies with its in the figure 1 lower end with a circumferential and substantially radially outer sealing edge 45 on a formed in the valve member 30 as a flat seat control valve seat 46.
  • the control valve seat 46 is arranged in a control valve chamber 48 which communicates via an inflow throttle 49 with the high-pressure accumulator chamber 24.
  • the hydraulic control chamber 34 is also connected via such an inflow 51 is in constant communication with the high pressure accumulator 24.
  • Radially outside of the control valve seat 46 opens into the control valve chamber 48, a connection (without reference numeral) from the hydraulic control chamber 34 ago, in which an outflow throttle 52 is arranged.
  • the control valve element 41 is penetrated in its longitudinal direction by a connection channel 53 which opens on the upper side of the control valve element 41 into an armature space 54, which in turn is connected to a low-pressure connection 55.
  • the fuel injection valve 10 described so far operates as follows:
  • the coil 43 is energized, so that the control valve element 41 lifts with its sealing edge 45 from the control valve seat 46. Now fuel from the hydraulic control chamber 34 via the outflow throttle 52, the
  • Control valve chamber 48 and the connecting channel 53 to the low pressure port 55 flow.
  • the pressure in the high-pressure storage space 24 decreases, and when the forces acting in the direction of flow are below the force acting in the opening direction on the pressure surface 56, the sealing edge 21 of the nozzle needle 20 lifts off from the injection valve seat 22. Now you can get fuel from the high-pressure reservoir
  • the energization of the coil 43 is terminated, whereby the control valve element 41 is pressed by the valve spring 44 with the sealing edge 45 against the control valve seat 46 again.
  • the connection of the tax Valve chamber 48 with the low pressure port 55 is thus interrupted.
  • the pressure in the control valve chamber 48 increases via the inflow throttle 49 and, as a result and also because of the inflow throttle 51, the pressure in the hydraulic control chamber 34.
  • the nozzle needle 20 closes.
  • the fuel injection valve 10 can be modified or modified in many ways.

Landscapes

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

Abstract

L'invention concerne une soupape d'injection de carburant selon le préambule de la revendication 1. Une telle soupape d'injection de carburant est déjà connue et est utilisée en particulier dans des "systèmes d'injection à rampe commune (Common-Rail)" sur des moteurs à combustion interne diesel pour le dosage du carburant dans les chambres de combustion du moteur à combustion interne. Dans le cas présent, la soupape d'injection de carburant connue présente un élément de buse d'injection en forme de goupille, qui ouvre ou ferme au moins un canal de sortie de carburant dans un boîtier d'injecteur. Selon l'invention, l'extrémité, opposée au au moins un canal de sortie de carburant, de l'élément de buse d'injection est guidée dans un élément de soupape, dont l'extrémité, tournée vers le au moins un canal de sortie de carburant, est conçue en forme de douille. L'élément de buse d'injection fait place sur la soupape d'injection de carburant connue, dans la zone d'extrémité de l'élément de soupape, à une partie réduite en diamètre. De la partie réduite en diamètre de l'élément de buse d'injection, on forme dans le boîtier d'injecteur un espace accumulateur de haute pression pour le carburant qui est en liaison avec le au moins un canal de sortie de carburant. L'inconvénient de la soupape d'injection de carburant connue est que celle-ci présente dans l'espace de haute pression des vibrations de pression relativement fortes qui ont des répercussions négatives sur la précision de dosage du carburant et les émissions sonores.
EP10762627A 2009-10-07 2010-09-22 Soupape d'injection de carburant Withdrawn EP2486265A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910045434 DE102009045434A1 (de) 2009-10-07 2009-10-07 Kraftstoffeinspritzventil
PCT/EP2010/063932 WO2011042300A1 (fr) 2009-10-07 2010-09-22 Soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP2486265A1 true EP2486265A1 (fr) 2012-08-15

Family

ID=43066867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10762627A Withdrawn EP2486265A1 (fr) 2009-10-07 2010-09-22 Soupape d'injection de carburant

Country Status (3)

Country Link
EP (1) EP2486265A1 (fr)
DE (1) DE102009045434A1 (fr)
WO (1) WO2011042300A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209891A1 (de) * 2015-05-29 2016-12-01 Robert Bosch Gmbh Unkrautregulierungsvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132879A2 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Dispositif d'injection de carburant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007011317A1 (de) * 2007-03-08 2008-09-11 Robert Bosch Gmbh Kraftstoffinjektor mit einer verbesserten Ausführung eines Steuerventils zur Steuerung einer Düsennadel
DE102008041167A1 (de) * 2008-08-12 2010-02-18 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009132879A2 (fr) * 2008-04-28 2009-11-05 Robert Bosch Gmbh Dispositif d'injection de carburant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011042300A1 *

Also Published As

Publication number Publication date
DE102009045434A1 (de) 2011-04-14
WO2011042300A1 (fr) 2011-04-14

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