EP1655483B1 - Soupape pour injecter du carburant - Google Patents

Soupape pour injecter du carburant Download PDF

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Publication number
EP1655483B1
EP1655483B1 EP05109378A EP05109378A EP1655483B1 EP 1655483 B1 EP1655483 B1 EP 1655483B1 EP 05109378 A EP05109378 A EP 05109378A EP 05109378 A EP05109378 A EP 05109378A EP 1655483 B1 EP1655483 B1 EP 1655483B1
Authority
EP
European Patent Office
Prior art keywords
valve
fuel
cone
edge
valve body
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.)
Expired - Fee Related
Application number
EP05109378A
Other languages
German (de)
English (en)
Other versions
EP1655483A1 (fr
Inventor
Erwin Achleitner
Claus Anzinger
Willibald SCHÜRZ
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP1655483A1 publication Critical patent/EP1655483A1/fr
Application granted granted Critical
Publication of EP1655483B1 publication Critical patent/EP1655483B1/fr
Expired - Fee Related 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
    • F02M61/16—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

Definitions

  • the invention relates to a valve for injecting fuel, which has a valve body having a recess in which a valve needle is arranged axially movable, which forms an injection nozzle in a downstream region with the valve body.
  • the WO 03/038271 A1 discloses a fuel injector with a valve needle having a closure body.
  • the closing body has a conical surface which widens in the outflow direction and which cooperates with a corresponding seating surface of a valve body.
  • the GB 3694 A discloses a fuel injector having a valve body having a nozzle plate with a knife-like edge on the discharge side, which projects into a fuel flow for preventing deposits in a spray-discharge opening of the valve body.
  • the US 4,417,694 A discloses an injection valve with a valve needle having a flat deflecting edge on the discharge side, which is arranged so that a direction of the fuel flow, which impinges on the deflecting edge during injection, is changed in order to achieve a hollow conical spray pattern.
  • the invention has for its object to provide a valve in which a spray pattern of the injected fuel is permanently protected against deposition-related changes and is easy and inexpensive to produce.
  • the invention is characterized by a valve for injecting fuel, which has a valve body having a recess in which a valve needle is arranged axially movable.
  • the valve needle forms an injection nozzle in a downstream region with the valve body.
  • the valve needle prevents a fuel flow through the injector in a closed position and otherwise releases it.
  • the injector has at a downstream end a deflector which is arranged to deflect a flow of fuel from a direction upstream of the deflector.
  • the deflector is applied as a coating.
  • the deflection element may be formed on the valve body or on the valve needle.
  • the injector includes a gap provided between the valve body and the valve needle in the downstream region.
  • the fuel may be gaseous or liquid.
  • the invention is based on the recognition that form deposits in areas of a valve, which are exposed to hot combustion gases and are not flown by the fuel flow at a high flow rate, during operation.
  • These deposits which consist essentially of carbon, can be produced at high temperatures by coking of fuel residues at the injection nozzle or by combustion residues from the combustion gases. These deposits can grow so much that they extend into the fuel stream and so undesirable from the fuel flow Distract upstream prevailing flow direction. A spray pattern of the valve can be adversely affected.
  • the fuel stream flows to the baffle at the high flow rate, thereby allowing combustion debris or coking nuclei deposited on the baffle to be flushed away from the baffle due to the high flow rate of the fuel stream. This is particularly the case when the deflector is arranged and formed as deposits that would arise if the deflector was not provided. A force exerted on the deposit by the fuel flow is then greater than an adhesion force of the deposits.
  • the baffle thereby has the function of artificial deposition or coking, which corresponds to artificial aging of the valve with respect to deposits or coking.
  • the deflector is to change a spray pattern of the injected fuel as deposits and coking at the injector after a longer period of operation change the spray pattern.
  • the recess widens in the outflow region in the flow direction conically or spherically towards a first edge.
  • the valve needle has a conical or spherical in the flow direction at an outgoing end towards a second edge widening closing body.
  • the closing body is seated in the closed position in the outflow region of the valve body on the wall of the recess.
  • the second edge is arranged downstream of the first edge. It has been found that this is particularly advantageous for good combustion of the fuel.
  • the deflecting element is formed in a region adjacent to the second edge.
  • Figure 1 shows a valve for injecting fuel, in particular for internal combustion engines in motor vehicles for injecting fuel.
  • the valve has an injector housing 1, in which a bore 2 is formed, and a port 3, which is coupled to the bore 2 and through which fuel can be supplied to the valve.
  • the valve further comprises a valve body 4 with a recess 5, in which a valve needle 6 is arranged axially movable, which closes an injection nozzle 7 in a closed position and otherwise allows a flow of fuel through the injection nozzle 7.
  • the valve further comprises a lifting device with an actuator 8 and a compensation element 9, which are coupled together in the axial direction.
  • the actuator 8 is for example a piezoelectric actuator.
  • the stroke of the lifting device is dependent on the axial extent of the actuator 8, which is dependent on a control signal.
  • the lifting device is coupled to the valve needle 6 and cooperates with the valve needle 6 so that the stroke of the lifting device is transmitted to the valve needle 6 and that the valve needle 6 is moved to its closed position or into an open position.
  • FIG. 3 shows an enlarged detail of the downstream region of the valve according to FIG. 2.
  • the recess 5 in the valve body 4 widens conically in a downstream region of the valve body 4 a first edge 11 and thus forms an inner cone 12 of the valve body 4.
  • the inner cone 12 of the valve body 4 has a setting angle ⁇ , which is related to a longitudinal axis 13 of the recess 5.
  • the valve needle 6 has at its downstream end a closing body 14, which has a first cone 15 and a second cone 16.
  • a setting angle of the first cone 15 is slightly smaller than the setting angle ⁇ of the inner cone 12 of the valve body 4 and a setting angle of the second cone 16 is slightly larger than the setting angle ⁇ of the inner cone 12 of the valve body 4.
  • the setting angles of the first cone 15 and the second cone 16 are also based on the longitudinal axis 13 of the recess 5 as the setting angle ⁇ .
  • the closing body 14 sits with a transition region between the first cone 15 and the second cone 16 on the inner cone 12 of the valve body 4, which forms a valve seat 17.
  • the transition region between the first cone 15 and the second cone 16 may be rounded or have a further cone whose setting angle is preferably approximately equal to the setting angle ⁇ of the inner cone 12 of the valve body 4.
  • the first cone 15 and the second cone 16 may adjoin one another directly.
  • a gap 18 is formed downstream of the valve seat 17 between the first cone 15 and the inner cone 12 of the valve body 4.
  • the inner cone 12 of the valve body 4, the first Cone 15, the second cone 16 and the transition region form the injection nozzle. 7
  • the first cone 15 extends to a second edge 19 at a downstream end of the injection nozzle 7.
  • the second edge 19 is preferably a greater distance from the valve seat 17 than the first edge 11 of the valve body 4. It has shown that this has an advantageous effect on the spray pattern 10, thus enabling better combustion.
  • deposits are formed, which are formed due to high temperatures in the combustion of the fuel from fuel residues in the gap 18 or by combustion residues in the combustion gases. These deposits are also known as coking.
  • the coking in the downstream end of the injection nozzle 7 may cause the fuel flow flowing out of the injection nozzle 7 to be deflected from its upstream prevailing flow direction, thereby undesirably changing the spray pattern 10.
  • a deflector 20 is provided to prevent the unwanted change of the spray pattern 10 by coking.
  • the baffle 20 preferably deflects the fuel flow as well as the coking that would form in this area after a longer period of operation if the baffle 20 were not provided.
  • the deflector 20 thus corresponds to an artificial coking or an artificial aging with respect to the coking of the valve.
  • the baffle 20 changes the flow direction of the fuel flow from a first flow direction 21, which would be at a corresponding valve without the baffle 20 and without coking, toward a second flow direction 22 of the fuel flow.
  • the setting angle ⁇ By changing the setting angle ⁇ , the flow direction of the fuel flow can be corrected accordingly, in this embodiment by reducing the setting angle ⁇ by an angle by which the fuel flow is deflected by the deflector 20 from the flow direction prevailing upstream of the deflector 20.
  • the setting angles of the first cone 15 and the second cone 16 are corrected accordingly.
  • the baffle 20 is arranged and configured to cause deposits deposited in the area flowed by the fuel stream to be flushed away from the baffle 20 during subsequent injections, as the baffle 20 preferably extends to a portion of the fuel flow in which suitable high flow rate prevails.
  • the deflecting element 20 may be formed integrally with the valve needle 6.
  • the deflecting element 20 is designed as a coating 23, which can also extend to an outer region of the valve body 4 or the valve needle 6.
  • a coating can be produced very simply and inexpensively.
  • the coating 23 may, for example, be applied as a carbon layer.
  • the coating 23 may be made of other suitable materials be prepared, in particular, the high temperatures during combustion processes withstand.
  • the coating 23 may also be applied only to the downstream end of the injector 7 to form the deflector 20.
  • the inner cone 12 of the valve body 4 or the closing body 14 in a region of the first cone 15, the second cone 16 and the transition region may also be spherical.
  • the deflector 20 may also be disposed at a downstream end of the inner cone 12 of the valve body 4.
  • FIG. 4 shows a nozzle device with a nozzle body 24, in which an injection nozzle 7 is formed.
  • the deflector 20 is arranged.
  • the deflection element 20 may be formed integrally with the nozzle body 24 or may be applied to the nozzle body 24 by the coating 23.
  • the nozzle device may also be formed in several pieces, so that the injection nozzle 7 is formed by further components.
  • the deflection element 20 on the injection nozzle 7 can be achieved that both in a new state of the valve or the nozzle device as well as after a longer period of operation of the valve or the nozzle device, the spray pattern 10 has a desired, low-incineration shape.

Landscapes

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

Claims (4)

  1. Soupape pour l'injection de carburant possédant un corps de soupape (4) qui présente une cavité (5) dans laquelle une aiguille de soupape (6) est montée mobile dans la direction axiale et qui, dans une région en aval, forme une buse d'injection (7) avec le corps de soupape (4) et qui, dans une position de fermeture, empêche le passage d'un courant de carburant à travers la buse d'injection (7) tandis que, dans une autre position, elle le libère, et la buse d'injection (7) présente, à une extrémité aval, un élément déflecteur (20) qui est disposé de telle manière qu'un courant de carburant soit dévié par rapport à une direction d'écoulement ayant lieu en amont de l'élément déflecteur (20), caractérisée en ce que l'élément déflecteur (20) est appliqué sous la forme d'un revêtement (23).
  2. Soupape selon la revendication 1, dans laquelle la cavité (5) s'élargit avec une forme de cône ou de sphère dans la région en aval, vu dans le sens de l'écoulement, jusqu'à une première arête (11) et, à son extrémité en aval, l'aiguille de soupape (6) présente un corps obturateur (14) qui s'élargit dans le sens de l'écoulement avec une forme de cône ou de sphère jusqu'à une deuxième arête (19) et, dans la position de fermeture, le corps obturateur (14) s'appuie sur la paroi de la cavité (5) dans la région en aval du corps de soupape (4).
  3. Soupape selon la revendication 2, dans laquelle la deuxième arête (19) est disposée en aval de la première arête (11).
  4. Soupape selon une des revendications 2 ou 3, dans laquelle l'élément déflecteur (20) est formé dans une région adjacente à la deuxième arête (19).
EP05109378A 2004-11-04 2005-10-10 Soupape pour injecter du carburant Expired - Fee Related EP1655483B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004053350A DE102004053350B4 (de) 2004-11-04 2004-11-04 Ventil zum Einspritzen von Brennstoff

Publications (2)

Publication Number Publication Date
EP1655483A1 EP1655483A1 (fr) 2006-05-10
EP1655483B1 true EP1655483B1 (fr) 2007-08-22

Family

ID=35285393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05109378A Expired - Fee Related EP1655483B1 (fr) 2004-11-04 2005-10-10 Soupape pour injecter du carburant

Country Status (3)

Country Link
US (1) US8459574B2 (fr)
EP (1) EP1655483B1 (fr)
DE (2) DE102004053350B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1811166B1 (fr) * 2006-01-24 2008-11-05 Continental Automotive GmbH Ensemble à vanne pour une soupape d'injection et soupape d'injection
KR20120061640A (ko) * 2010-12-03 2012-06-13 현대자동차주식회사 노킹 방지 장치 및 이를 제어하는 방법

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191403694A (en) * 1913-11-22 1915-07-01 Maschf Augsburg Nuernberg Ag Improvements in and relating to Fuel Injecting Devices for Diesel Motors.
DE757316C (de) * 1938-07-21 1951-07-26 Bosch Gmbh Robert Einspritzduese
DE1247066B (de) * 1962-08-02 1967-08-10 Citroen Sa Kraftstoff-Einspritzventil fuer fremdgezuendete Brennkraftmaschinen
GB2080416A (en) * 1980-07-16 1982-02-03 Lucas Industries Ltd Fuel injection nozzle
US4417694A (en) * 1980-10-22 1983-11-29 The Bendix Corporation Injector valve with contoured valve seat and needle valve interface
CA1279798C (fr) * 1985-07-19 1991-02-05 Peter William Ragg Injection de carburant
US4817873A (en) * 1985-11-13 1989-04-04 Orbital Engine Company Proprietary Limited Nozzles for in-cylinder fuel injection systems
DE69132070T2 (de) * 1990-01-26 2000-09-14 Orbital Eng Australia Kraftstoffeinspritzdüse
GB2255802A (en) * 1991-05-15 1992-11-18 Lucas Ind Plc Pintle fuel injection nozzle.
DE4222137B4 (de) * 1992-07-06 2006-05-04 Robert Bosch Gmbh Kraftstoff-Einspritzdüse für Diesel-Brennkraftmaschinen
GB0000863D0 (en) * 2000-01-15 2000-03-08 Delphi Diesel Systems Ltd Fuel injector
AUPQ852300A0 (en) * 2000-06-30 2000-07-27 Orbital Engine Company (Australia) Proprietary Limited Shock wave injector nozzle
DE10152419A1 (de) * 2001-10-24 2003-06-18 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10353173A1 (de) * 2003-11-14 2005-06-16 Robert Bosch Gmbh Einspritzventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102004053350B4 (de) 2007-06-21
DE102004053350A1 (de) 2006-05-18
DE502005001297D1 (de) 2007-10-04
US8459574B2 (en) 2013-06-11
EP1655483A1 (fr) 2006-05-10
US20060091240A1 (en) 2006-05-04

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