EP2201241B1 - Soupape d'injection de carburant á commande électromagnétique - Google Patents

Soupape d'injection de carburant á commande électromagnétique Download PDF

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Publication number
EP2201241B1
EP2201241B1 EP08804862A EP08804862A EP2201241B1 EP 2201241 B1 EP2201241 B1 EP 2201241B1 EP 08804862 A EP08804862 A EP 08804862A EP 08804862 A EP08804862 A EP 08804862A EP 2201241 B1 EP2201241 B1 EP 2201241B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
cover part
magnetic circuit
valve according
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.)
Not-in-force
Application number
EP08804862A
Other languages
German (de)
English (en)
Other versions
EP2201241A1 (fr
Inventor
Ferdinand Reiter
Thomas Sebastian
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 EP2201241A1 publication Critical patent/EP2201241A1/fr
Application granted granted Critical
Publication of EP2201241B1 publication Critical patent/EP2201241B1/fr
Not-in-force 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim, such as in the EP 781 915 shown.
  • a fuel injection valve for fuel injection systems of internal combustion engines comprising an excitable actuator in the form of an electromagnetic circuit having a magnetic coil, an outer magnetic circuit component and a movable armature for actuating a valve closing body, which cooperates with a provided on a valve seat body valve seat.
  • an excitable actuator in the form of an electromagnetic circuit having a magnetic coil, an outer magnetic circuit component and a movable armature for actuating a valve closing body, which cooperates with a provided on a valve seat body valve seat.
  • the fuel injection valve serving as a fuel inlet nozzle and inner pole tubular core, which is surrounded by the magnetic coil.
  • the outer magnetic circuit component is designed pot-shaped, wherein the magnetic circuit component is installed in the valve so that it is slipped over the magnetic coil.
  • the electromagnetic circuit is closed by a closure part, which is inserted from below into the magnetic circuit component.
  • the movable armature is guided in the bobbin or in an inner opening of the closure part.
  • the entire actuator is enclosed by a plastic extrusion, which also forms an inflow-side connecting piece.
  • a fuel injection valve is also already known, is dispensed with serving as a fuel inlet nozzle and inner pole tubular core, which is surrounded by the magnetic coil.
  • the fuel injection valve is characterized in that both the inflow-side connecting piece and the connecting part serving as a valve seat carrier as deep-drawn sheet metal parts are executed.
  • the sheet metal parts are formed by a deformation stress exceeding the yield value of their material and connected together by means of connecting pins to form a valve housing.
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that in a simple and cost-effective manner, a particularly compact structure in the region of the magnetic circuit and in the areas upstream and downstream of the magnetic circuit can be realized, so that a very small, handy injection valve arises.
  • a simple structural solution is provided with which a sealed dense coil space is created for coil sealing by a very simple design, serving as the inner pole of the magnetic circuit cover part is inserted into an outer magnetic circuit component. Since the components of the electromagnetic circuit as well as the connected to the magnetic circuit components connecting parts have very simple geometries and have a low-cost design, the fuel injector is particularly favorable in the production of the items and the assembly. The very short magnetic circuit works very effectively with low losses and thus has the best functional properties.
  • the construction according to the invention makes it possible to produce a fuel injection valve with a total length of ⁇ 30 mm.
  • the dense coil space for the magnetic coil with the outer magnetic circuit component, the cover part and a thin-walled sleeve body to limit.
  • the sleeve body is a metal non-magnetic intermediate part or forms as a ferritic component, a magnetic throttle point in the magnetic circuit.
  • the cover part is firmly connected to the sleeve body by means of a weld.
  • Length variants of the fuel injection valve according to the invention are very easy to produce in large numbers by differently long and specifically shaped connecting pieces, valve seat carrier, valve needles and spacers.
  • FIG. 1 a fuel injection valve in two variants of embodiments according to the invention in the electromagnetic circuit.
  • FIG. 1 shown electromagnetically operable valve in the form of an injector for fuel injection systems of mixture-compression, spark-ignition internal combustion engines has an electromagnetic circuit with a solenoid 1, which does not, as is common in such injectors, surrounds serving as a fuel inlet port and inner pole tubular core. Rather, the magnetic coil 1 surrounds a thin-walled cylindrical sleeve body 2.
  • a bobbin 3 receives a winding of the magnetic coil 1.
  • the bobbin 3 made of plastic passes directly into a mitgespritzten electrical connection plug 5, not shown in detail, via which the electrical contacting of the magnetic coil 1 takes place.
  • the sleeve body 2 is arranged concentrically to a valve longitudinal axis 10, wherein the sleeve body 2 is either a metal non-magnetic intermediate part, which is made for example of stainless steel, or forms a magnetic throttle body in the magnetic circuit as a ferritic component.
  • the bobbin 3 Surrounded is the bobbin 3 with the magnetic coil 1 of an outer cup-shaped Magnetic circuit component 11, which is part of the valve housing.
  • a cover part 14 is inserted into the magnetic circuit component 11, which serves as the inner pole of the magnetic circuit.
  • the lid part 14 is in turn connected to the sleeve body 2 by means of a second weld 15 tightly and firmly. With the cover part 14, the sleeve body 2 and the outer magnetic circuit component 11, a sealed, dense coil space is created in this way, which is interrupted only in the area of the electrical contacting of the magnetic coil 1 by a recess 16 in the cover part 14.
  • the cover part 14 extends as a largely flat disc.
  • the cover member 14 is also disc-shaped, but formed with a cylindrical extension 8, whereby it is possible to attach to an axially parallel peripheral surface 18 of the extension 8 of the cover member 14, the weld 15, 15b.
  • a thin-walled tubular connecting part Downstream of the magnetic circuit component 11 extends a thin-walled tubular connecting part, which is designed here as a valve seat carrier 19, which is fixedly connected to the magnetic circuit component 11 via a third weld 20.
  • the component bottom 12 of the magnetic circuit component 11 has an annular extension 22 which protrudes from the magnetic circuit component 11 such that the weld seam 20 can be attached in this region without impairing the magnetic coil 1 or other components for connection to the valve seat carrier 19.
  • an axially movable valve needle 21 is arranged in the valve seat carrier 19.
  • a spherical valve closing body 24 made of metal or ceramic is provided.
  • the actuation of the injection valve is electromagnetically.
  • the electromagnetic circuit with the solenoid coil 1, the outer magnetic circuit member 11, the cover member 14 and an armature serves 27.
  • the cup-shaped armature 27 is, for example formed integrally with a valve needle shaft 21a (right in FIG. 1 ) or at a stage 28 of the valve needle shaft 21 a and there firmly connected to this (left in FIG. 1 ).
  • the guide of the armature 27 during its axial movement takes place along the inner wall of the sleeve body 2.
  • the solenoid 1 end facing away from the valve seat support 19 is a cylindrical valve seat body 29 having a fixed valve seat 30, mounted by welding tight.
  • the valve seat body 29 is made of metal or ceramic and sealed by a sealing ring 31.
  • the spherical valve closing body 24 of the valve needle 21 cooperates with the valve seat 30 of the valve seat body 29, which tapers frustoconically in the flow direction.
  • the valve seat body 29 On its lower end face, the valve seat body 29 is provided with a spray hole disk 34 of flat design, for example, and of e.g. cup-shaped holding disc 35 fixed and tight by a z. B. connected by means of a laser weld.
  • the spray perforated disk 34 at least one, for example, four ejection openings 39 formed by eroding or punching are provided.
  • a plurality of flow-through grooves 40 are provided circumferentially in the valve seat body 29 in the region of a guide section.
  • the arrangement of the cover part 14 in the outer magnetic circuit component 11 and on the sleeve body 2 is crucial for the stroke of the valve needle 21.
  • the one end position of the valve needle 21 is fixed at non-energized magnetic coil 1 by the contact of the valve closing body 24 to the valve seat 30 of the valve seat body 29 while the other end position of the valve needle 21 results in energized solenoid coil 1 by the system of the armature 27 at the lower end of the cover part 14, which is provided there eg with a wear protection layer.
  • the cover part 14 is firmly connected to a thin-walled connecting piece 41 by means of a fourth weld seam 38.
  • the connecting piece 41 extends in a tubular manner and can be shaped in a targeted manner via steps at different points with respect to the inner diameter, such as FIG. 1 can be seen. Variable lengths for the connecting pieces 41 can be used.
  • the connecting piece 41 engages either in a groove 36 on the cover part 14 (left in FIG. 1 ) or sits on a shoulder 37 of the lid part 14 (right in FIG. 1 ).
  • the shoulder 37 may be formed with a width in the wall thickness of the connecting piece 41, so that the connecting piece 41 is flush with the inner bore of the cover member 14 seated on this.
  • a setting 43 is fitted in a concentric with the valve longitudinal axis 10 extending flow bore 42 of the connecting piece 41, which serves to supply the fuel in the direction of the valve seat 30, except for the return spring 26, a setting 43 is fitted.
  • the adjusting member 43 is used to adjust the spring bias of the voltage applied to the adjusting element 43 return spring 26, which in turn is supported with its opposite side of the armature 27, wherein an adjustment of the dynamic Abspritzmenge with the adjustment 43.
  • a fuel filter 44 is integrated directly in the adjusting element 43.
  • the fuel injection valve according to the invention is characterized by a particularly compact design in the region of the magnetic circuit as well as in the areas upstream and downstream of the magnetic circuit, so that a very small, handy injection valve is formed.
  • Both the connecting piece 41 and the valve seat carrier 19 are designed as thin-walled deep-drawn components which inflow the inflow valve and downstream with bent annular collar 45, 46 limit.
  • These annular collars 45, 46 each form a boundary of an annular groove 47, 48, in each of which a sealing ring 49, 50 in the form of an O-ring for sealing the fuel injection valve to the outside (fuel rail, intake manifold) is introduced.
  • the respective other boundary of the annular grooves 47, 48 define spacers 52, 53, which are pushed circumferentially on the connecting piece 41 and the valve seat carrier 19.
  • the spacers 52, 53 are formed for example of plastic and have a structure that is highly stable by chamber-like, outwardly reaching cavities and very low mass.
  • Length variants of the fuel injection valve are very easy to produce in large numbers by differently long and specifically shaped connection piece 41, valve seat carrier 19, valve needles 21 and spacers 52, 53.
  • a color coding of the fuel injectors is very easy on appropriately colored spacers 52, 53 possible.
  • a plastic extrusion of the fuel injection valve can be omitted.

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)

Claims (8)

  1. Soupape d'injection de carburant pour installations d'injection de carburant de moteurs à combustion interne, comprenant un axe longitudinal de soupape (10), un actionneur excitable sous forme d'un circuit électromagnétique avec une bobine magnétique (1), un composant de circuit magnétique extérieur (11) et une armature mobile (27) pour l'actionnement d'un corps de fermeture de soupape (24) qui coopère avec un siège de soupape (30) prévu sur un corps de siège de soupape (29), le composant de circuit magnétique extérieur (11) présentant un fond de composant (12) et du côté opposé au fond de composant (12), une partie de couvercle en forme de disque (14) étant insérée dans le composant de circuit magnétique extérieur (11), laquelle sert de pôle interne du circuit magnétique et un espace de bobine étanche pour la bobine magnétique (1) étant limité par le composant de circuit magnétique extérieur (11), la partie de couvercle (14) et un corps de douille (2) à parois minces,
    caractérisée en ce que
    la partie de couvercle (14) est connectée fixement au corps de douille (2) au moyen d'un cordon de soudure (15), et
    en ce que le corps de douille (2) possède une section transversale en forme de L, qui, à part une allure cylindrique dans la direction périphérique, présente un rebord annulaire (9) recourbé, de sorte que le cordon de soudure (15, 15a) soit appliqué contre une surface frontale horizontale (17) de la partie de couvercle (14).
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la partie de couvercle (14) est connectée fixement du côté de l'afflux à un raccord (41), notamment au moyen d'un cordon de soudure (38).
  3. Soupape d'injection de carburant selon la revendication 2,
    caractérisée en ce que le raccord (41) est réalisé sous forme tubulaire et à paroi mince.
  4. Soupape d'injection de carburant selon la revendication 2 ou 3,
    caractérisée en ce que
    le raccord (41) vient en prise dans une rainure (36) sur la partie de couvercle (14).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le contact électrique de la bobine magnétique (1) s'effectue par un évidement (16) dans la partie de couvercle (14).
  6. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    le corps de douille (2) constitue une partie intermédiaire métallique non magnétique ou forme, en tant que composant ferritique, un étranglement magnétique dans le circuit magnétique.
  7. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la partie de couvercle (14) sert de butée pour l'armature (27), laquelle est pourvue à cet endroit notamment d'une couche de protection contre l'usure.
  8. Soupape d'injection de carburant selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la soupape d'injection de carburant a une longueur totale < 30 mm.
EP08804862A 2007-10-18 2008-09-29 Soupape d'injection de carburant á commande électromagnétique Not-in-force EP2201241B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007049946A DE102007049946A1 (de) 2007-10-18 2007-10-18 Brennstoffeinspritzventil
PCT/EP2008/063003 WO2009053221A1 (fr) 2007-10-18 2008-09-29 Soupape d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2201241A1 EP2201241A1 (fr) 2010-06-30
EP2201241B1 true EP2201241B1 (fr) 2011-12-21

Family

ID=40351980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08804862A Not-in-force EP2201241B1 (fr) 2007-10-18 2008-09-29 Soupape d'injection de carburant á commande électromagnétique

Country Status (4)

Country Link
EP (1) EP2201241B1 (fr)
AT (1) ATE538303T1 (fr)
DE (1) DE102007049946A1 (fr)
WO (1) WO2009053221A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3704542A1 (de) * 1987-02-13 1988-08-25 Vdo Schindling Kraftstoff-einspritzventil
US5150842A (en) 1990-11-19 1992-09-29 Ford Motor Company Molded fuel injector and method for producing
EP0781915A1 (fr) * 1995-12-26 1997-07-02 General Motors Corporation Injecteur de carburant
DE19712922B4 (de) 1997-03-27 2005-08-11 Robert Bosch Gmbh Brennstoffeinspritzventil

Also Published As

Publication number Publication date
DE102007049946A1 (de) 2009-04-23
EP2201241A1 (fr) 2010-06-30
ATE538303T1 (de) 2012-01-15
WO2009053221A1 (fr) 2009-04-30

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