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EP1068442A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant

Info

Publication number
EP1068442A1
EP1068442A1 EP99960933A EP99960933A EP1068442A1 EP 1068442 A1 EP1068442 A1 EP 1068442A1 EP 99960933 A EP99960933 A EP 99960933A EP 99960933 A EP99960933 A EP 99960933A EP 1068442 A1 EP1068442 A1 EP 1068442A1
Authority
EP
European Patent Office
Prior art keywords
closing body
valve
fuel injection
injection valve
flattening
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.)
Granted
Application number
EP99960933A
Other languages
German (de)
English (en)
Other versions
EP1068442B1 (fr
Inventor
Werner Hanft
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 EP1068442A1 publication Critical patent/EP1068442A1/fr
Application granted granted Critical
Publication of EP1068442B1 publication Critical patent/EP1068442B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0667—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature acting as a valve or having a short valve body attached thereto

Definitions

  • the invention relates to a fuel injector according to the preamble of the main claim.
  • a fuel injector in the form of an electromagnetically actuated valve is already known from DE-PS 38 31 196, in which a valve needle is formed from an armature, a tubular connecting part and a spherical valve closing body.
  • the armature and the valve closing body are connected to one another via the tubular connecting part, the connecting part with which the
  • Valve closing body is firmly connected by means of a weld seam.
  • the connecting part has a multiplicity of flow openings through which fuel can emerge from an inner passage opening and can flow outside the connecting part as far as the valve closing body or to a valve seat surface which interacts with the valve closing body.
  • the connecting tube which is rolled in terms of production technology, has a longitudinal slot running over the entire length, through which, owing to its large hydraulic area
  • the end region encompasses the valve closing body in such a way that at least one channel which is connected directly to a longitudinal bore of the closing body carrier is formed on the surface of the valve closing body.
  • the end region extends beyond the equator of the valve closing body. A firm connection is achieved by flanging or pressing.
  • US Pat. No. 4,483,485 already shows a fuel injector which has a valve needle with a spherical valve closing body.
  • the spherical valve closing body can also be provided with a horizontal flattening which extends within the connecting part of the valve needle serving as the closing body carrier.
  • transverse openings or several slot openings open towards the valve closing body are provided in one end region.
  • an opening geometry which requires additional manufacturing or processing steps and is specifically introduced into the closing body carrier is required for the outflow of the fuel.
  • a spherical valve closing body is at least one axial
  • the closing body carrier can be produced in a very simple manner in a rotationally symmetrical manner, without any opening geometries having to be introduced on its outer contour for the exit of fuel. This eliminates all processing steps that are usually required for such additional flow openings.
  • the closing body carrier engages around the valve closing body in such a way that, depending on the number of flattenings, it forms one or more channels directly on the surface of the valve closing body, through which fuel can flow unhindered coming from the inner longitudinal bore towards a valve seat surface. Optimal inflow to the metering area of the valve is achieved with little manufacturing effort.
  • At least one flattening is formed at an angle to the longitudinal valve axis of 12 to 25 ° and to let the flattening extend in a downstream direction via a spherical equator of the valve closing body.
  • a magnet armature can itself serve directly as a closing body carrier, so that a two-part valve needle is present together with the valve closing body.
  • a valve needle is particularly simple and inexpensive to manufacture and, due to the reduced number of parts, has only a single connection point.
  • FIG. 1 shows a fuel injector according to the invention
  • FIG. 2 shows a first exemplary embodiment of a valve needle
  • FIG. 3 shows a symbolically illustrated fuel flow on a valve needle according to FIG. 2
  • FIG. 4 shows a second exemplary embodiment of a valve needle
  • FIG. 5 shows a symbolically illustrated fuel flow on a valve needle according to FIG. 4
  • Figure 6 shows a third embodiment of a valve needle.
  • FIG. 1 by way of example and partially in simplified form in the shape of an injector for
  • Fuel injection systems of mixture-compressing, spark-ignited internal combustion engines have a largely tubular core 2, which is surrounded by a magnet coil 1 and serves as an inner pole and partly as a fuel flow. Together with an upper, disk-shaped cover element 3, the core 2 enables a particularly compact structure of the injection valve in the area of the magnet coil 1.
  • the magnet coil 1 is surrounded by an outer, ferromagnetic valve jacket 5 as the outer pole, which completely surrounds the magnet coil 1 in the circumferential direction and at its upper end with the cover element 3 z. B. is connected by a weld 6.
  • valve jacket 5 is stepped at its lower end, so that a guide section 8 is formed, which axially encloses the magnet coil 1 similarly to the cover element 3 and which represents the boundary of the magnet coil region 1 downwards or in the downstream direction .
  • the guide section 8 of the valve jacket 5, the magnet coil 1 and the cover element 3 form an inner opening 11 or 58, which extends concentrically to a longitudinal valve axis 10 and in which an elongated sleeve 12 extends.
  • An inner longitudinal opening 9 of the ferritic sleeve 12 partially serves as a guide opening for a valve needle 13 that is axially movable along the longitudinal axis 10 of the valve.
  • the sleeve 12 ends, viewed in the downstream direction, for example in the region of the guide section 8 of the valve jacket 5, with which it is fixed, for example, with a weld seam 54 connected is.
  • the valve needle 13 is formed by a tubular closing body carrier 17, which also functions as a magnet armature, and a largely spherical valve closing body 18 educated.
  • the valve needle 13 can also be formed in three parts by an armature 17 ⁇ , a closing body support 17 and a valve closing body 18.
  • the fixed core 2 is also arranged in the longitudinal opening 9 of the sleeve 12.
  • the sleeve 12 also fulfills a sealing function, so that a dry magnet coil 1 is present in the injection valve. This is also achieved in that the disc-shaped
  • Covering element 3 completely covers the magnetic coil 1 on its upper side.
  • the inner opening 58 in the cover element 3 allows the sleeve 12 and thus also the core 2 to be of elongated design, so that both components protrude through the opening 58 beyond the cover element 3.
  • a valve seat body 14 adjoins the lower guide section 8 of the valve jacket 5 and has a fixed valve seat surface 15 as the valve seat.
  • Valve seat body 14 is fixedly connected to valve jacket 5 by means of a second weld 16, for example, generated by means of a laser.
  • a second weld 16 for example, generated by means of a laser.
  • On the downstream end face of the valve seat body 14 is, for. B. in a recess 19 a flat spray plate 20, the fixed connection of valve seat body 14 and spray plate 20 z. B. is realized by a circumferential dense weld 21.
  • the tubular closing body carrier 17 is firmly connected at its downstream end facing the spraying orifice plate 20 to the spherical valve closing body 18, for example by welding.
  • the closing body carrier 17 has an inner longitudinal bore 23 through which fuel flows and from which it emerges downstream and in the region of at least one flattened portion 24 which has an axial extension component can flow directly along the valve closing body 18 up to the valve seat surface 15.
  • the injection valve is actuated electromagnetically in a known manner.
  • a piezoelectric actuator can also be used to actuate the valve needle 13.
  • the electromagnetic circuit with the magnet coil 1, the inner core 2, the outer valve jacket 5 and the armature 17 serves for the axial movement of the valve needle 13 and thus for opening against the spring force of a return spring 25 or closing the injection valve is aligned with the end of the valve closing body 18 facing the core 2.
  • the spherical valve closing body 18 interacts with the valve seat surface 15 of the valve seat body 14 which tapers in the shape of a truncated cone in the direction of flow and is formed in the axial direction downstream of a guide opening 26 in the valve seat body 14.
  • the spray orifice plate 20 has at least one, for example four, spray openings 27 formed by eroding or stamping.
  • an adjusting sleeve 29 is inserted in addition to the return spring 25.
  • the adjusting sleeve 29 is used to adjust the spring preload of the return spring 25 abutting the adjusting sleeve 29, which in turn is supported with its opposite side on an insert part 31 which is firmly connected to the closing body carrier 17, the dynamic injection quantity also being adjusted using the adjusting sleeve 29.
  • Such an injection valve is characterized by its particularly compact construction, so that a very small, handy injection valve is produced, the valve jacket 5 of which has an outer diameter of only about 11 mm, for example.
  • the components described so far form a preassembled independent assembly, which can be referred to as functional part 30.
  • the fully set and assembled functional part 30 has z. B. on an upper end face 32, for example, two contact pins 33 protrude.
  • Contact pins 33 which serve as electrical connecting elements, are used to make electrical contact with the magnetic coil 1 and thus to excite it.
  • connection part can be connected to such a functional part 30, which is distinguished above all by the fact that it comprises the electrical and the hydraulic connection of the injection valve.
  • a hydraulic connection between the connection part (not shown) and the functional part 30 is achieved in the fully assembled injection valve in that flow bores of both assemblies are brought together so that an unimpeded flow of fuel is ensured. It is then z. B. the end face 32 of the functional part 30 directly on a lower one
  • connection part is mounted on the functional part 30, the part of the core 2 and the sleeve 12 which projects beyond the end face 32 can be inserted into a flow hole in the flow hole to increase the connection stability
  • a sealing ring 36 is provided, which rests on the end face 32 of the cover 3, the sleeve 12.
  • the contact pins 33 serving as electrical connecting elements go fully assembled Valve a secure electrical connection with corresponding electrical connecting elements of the connector.
  • FIG 2 shows the valve needle 13 on an enlarged scale compared to Figure 1.
  • the tubular closing body support 17 is designed as a turned part, which has a multi-step outer contour.
  • an annular guide surface 40 is formed, which serves to guide the axially movable valve needle 13 in the sleeve 12.
  • the closing body carrier 17, for example made of a ferritic material (chrome steel), has an upper stop surface 42 facing the core 2, which is provided with a wear protection layer, e.g. B. is chrome-plated.
  • the inner longitudinal bore 23 in the closing body carrier 17 has a largely circular cross section. Overall, the closing body carrier 17 is advantageously rotationally symmetrical.
  • the largely spherical valve closing body 18 has at least one flattened portion 24 with an axial extension component on its outer circumference.
  • the closing body carrier 17 surrounds the valve closing body 18 with a downstream end region 46, that is to say partially into the valve body
  • Longitudinal bore 23 of the closing body carrier 17 protrudes.
  • a fixed connection for example achieved by welding, is provided.
  • the at least one flat 24 is formed on the valve closing body 18 in such a way that it extends into the longitudinal bore 23. This ensures that at least one channel 47 exists between the inner wall of the closing body support 17 and the flattened portion 24, through which the inlet in the longitudinal bore 23 and on the Valve closing body 18 fuel flowing along in the direction of the valve seat surface 15 is forwarded.
  • the angle of the flat 24 to the valve longitudinal axis 10 is e.g. 12 to 25 °. However, other angles between 10 and 50 ° are also conceivable.
  • a further flattened portion 24 ′ can follow the obliquely inclined flattened portion 24 and runs, for example, perpendicularly, that is to say parallel to the longitudinal axis 10 of the valve.
  • a transition edge 48 from the first flattening 24 to the second flattening 2 ' is still upstream of a spherical equator 49 of the
  • Valve closing body 18 The flattening 24 ′ extends clearly beyond the spherical equator 49 in the downstream direction, so that a largely central fuel flow is generated along the valve closing body 18, as is symbolically indicated by an arrow in FIG. 3.
  • FIG. 4 shows a second exemplary embodiment of a valve needle 13, in which the valve needle 13 compared to
  • FIG. 4 illustrated embodiment constant or equivalent parts are identified by the same reference numerals.
  • the valve needle 13 according to FIG. 4 is characterized in that the flattened portion 24 is not divided and extends obliquely at an constant angle between 12 ° and 25 ° to the longitudinal axis 10 of the valve and over the ball equator 49.
  • FIG. 5 it is symbolically shown with a plurality of arrows that in such an embodiment a more diversified fuel flow is made possible, which can be advantageous for a wider flow on the valve seat surface 15.
  • FIG. 6 A further exemplary embodiment of a valve needle 13 is shown in FIG. 6.
  • the armature 17 v and the valve closing body 18 are over one sleeve-shaped connecting part connected to one another, the connecting part now forming the closing body support 17.
  • the connections on the valve needle 13 are made, for example, by welding.
  • valve closing body support 17 which represents a connecting part.
  • the valve closing body 18 corresponds to e.g. that of the exemplary embodiment according to FIG. 4. In principle, more than one flattened portion 24 can be provided.
  • the closing body carrier 17 In addition to the design of the closing body carrier 17 as a turned part or a cold pressed part, designs as a sintered part or MIM (metal injection molding) part are also possible.
  • MIM metal injection molding

Landscapes

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

Abstract

L'invention concerne une soupape d'injection de carburant comportant un pointeau (13) qui est mobile dans le sens axial et comprend au moins un support d'élément d'obturation (17) et un élément sphérique d'obturation de soupape (18). Le support d'élément d'obturation (17) reçoit, par sa partie terminale (46) située en aval, l'élément d'obturation (18). Ce dernier présente au niveau de sa surface au moins une partie aplatie (24) s'étendant axialement. Au moins un canal (47) pour le passage d'un flux de carburant est formé entre la ou les parties aplaties (24) et une paroi intérieure du support d'élément d'obturation (17). Cette soupape d'injection de carburant s'utilise en particulier dans des installations d'injection de carburant de moteurs à combustion interne à compression du mélange et à allumage commandé.
EP99960933A 1998-12-02 1999-11-19 Soupape d'injection de carburant Expired - Lifetime EP1068442B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19855568 1998-12-02
DE19855568A DE19855568A1 (de) 1998-12-02 1998-12-02 Brennstoffeinspritzventil
PCT/DE1999/003689 WO2000032926A1 (fr) 1998-12-02 1999-11-19 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP1068442A1 true EP1068442A1 (fr) 2001-01-17
EP1068442B1 EP1068442B1 (fr) 2003-09-03

Family

ID=7889720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99960933A Expired - Lifetime EP1068442B1 (fr) 1998-12-02 1999-11-19 Soupape d'injection de carburant

Country Status (6)

Country Link
US (1) US6357676B1 (fr)
EP (1) EP1068442B1 (fr)
JP (1) JP2002531751A (fr)
KR (1) KR100630606B1 (fr)
DE (2) DE19855568A1 (fr)
WO (1) WO2000032926A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10052486A1 (de) * 2000-10-23 2002-05-08 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10054183A1 (de) * 2000-11-02 2002-05-29 Siemens Ag Einspritznadel mit elastischer Nadelspitze
DE10103932B4 (de) * 2001-01-30 2010-01-21 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10142302A1 (de) * 2001-08-29 2003-03-20 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10254681B4 (de) * 2002-11-22 2005-09-08 Siemens Ag Einspritzdüse und Einspritzverfahren, sowie ein Herstellungsverfahren für eine Einspritzdüse
JP2006233887A (ja) * 2005-02-25 2006-09-07 Denso Corp 燃料噴射弁
DE102010040914A1 (de) 2010-09-16 2012-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102010040910A1 (de) 2010-09-16 2012-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102010040916A1 (de) * 2010-09-16 2012-03-22 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102011003926A1 (de) * 2011-02-10 2012-08-16 Robert Bosch Gmbh Ventil zum Steuern eines Fluids
JP6061074B2 (ja) * 2012-09-28 2017-01-18 株式会社ケーヒン 燃料噴射弁
JP6035647B2 (ja) * 2012-09-28 2016-11-30 株式会社ケーヒン 燃料噴射弁

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Publication number Priority date Publication date Assignee Title
US4103868A (en) * 1976-12-29 1978-08-01 Elkhart Brass Manufacturing Co., Inc. Ball valve having an improved ball element design
US4483485A (en) 1981-12-11 1984-11-20 Aisan Kogyo kabuskiki Kaisha Electromagnetic fuel injector
DE3316979C2 (de) * 1983-05-09 1986-10-23 Jürgen Dipl.-Ing. 8402 Neutraubling Guido Druckanschluß einer Kraftstoff-Einspritzleitung für Dieselmotoren
DE3825135A1 (de) * 1988-07-23 1990-01-25 Bosch Gmbh Robert Elektromagnetisch betaetigbares ventil
DE3831196A1 (de) 1988-09-14 1990-03-22 Bosch Gmbh Robert Elektromagnetisch betaetigbares ventil
DE4018256A1 (de) 1990-06-07 1991-12-12 Bosch Gmbh Robert Elektromagnetisch betaetigbares brennstoffeinspritzventil
US5199648A (en) 1991-03-20 1993-04-06 Zexel Corporation Fuel injection valve
DE4123692C2 (de) * 1991-07-17 1995-01-26 Bosch Gmbh Robert Brennstoffeinspritzventil
DE4304804A1 (de) * 1993-02-17 1994-08-18 Bosch Gmbh Robert Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches
DE4312756A1 (de) * 1993-04-20 1994-10-27 Bosch Gmbh Robert Vorrichtung zur Einspritzung eines Brennstoff-Gas-Gemisches
DE4408875A1 (de) * 1994-03-16 1995-09-21 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19712590A1 (de) 1997-03-26 1998-10-01 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil

Non-Patent Citations (1)

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Title
See references of WO0032926A1 *

Also Published As

Publication number Publication date
DE19855568A1 (de) 2000-06-08
JP2002531751A (ja) 2002-09-24
EP1068442B1 (fr) 2003-09-03
KR20010034380A (ko) 2001-04-25
KR100630606B1 (ko) 2006-10-04
WO2000032926A1 (fr) 2000-06-08
US6357676B1 (en) 2002-03-19
DE59906870D1 (de) 2003-10-09

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