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EP0937202B1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP0937202B1
EP0937202B1 EP98940057A EP98940057A EP0937202B1 EP 0937202 B1 EP0937202 B1 EP 0937202B1 EP 98940057 A EP98940057 A EP 98940057A EP 98940057 A EP98940057 A EP 98940057A EP 0937202 B1 EP0937202 B1 EP 0937202B1
Authority
EP
European Patent Office
Prior art keywords
sealing
valve
fuel injection
plastic encapsulation
injection 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.)
Expired - Lifetime
Application number
EP98940057A
Other languages
German (de)
English (en)
Other versions
EP0937202A1 (fr
Inventor
Dieter Maier
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 EP0937202A1 publication Critical patent/EP0937202A1/fr
Application granted granted Critical
Publication of EP0937202B1 publication Critical patent/EP0937202B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M51/08—Injectors peculiar thereto with means directly operating the valve needle specially for low-pressure fuel-injection
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting

Definitions

  • the invention is based on a fuel injector according to the genus of the main claim.
  • Numerous fuel injection valves are already known, for example from EP-PS 0 348 786 or from DE-OS 40 08 118, which have several sealing rings on their outer circumferences, which are usually designed as O-rings.
  • the geometric arrangement or the location of the independent Representing components and to be assembled separately Sealing rings depend on the installation conditions on the Internal combustion engine or the embodiments of the valves, e.g. as top feed injectors or bottom feed injectors can be trained.
  • Fuel injectors are made with the sealing rings desired sealing against a suction pipe, a Cylinder head or receiving sleeves or a fuel rail, one Distribution line or the like.
  • the sealing rings are on the fuel injector in specially designed Installation spaces, such as Ring grooves, on the valve housing, on Nozzle body, on attachment bodies or on the Plastic extrusion introduced.
  • the fuel injector according to the invention with the characteristic features of the main claim has the Advantage that a simple and inexpensive and safe and effectively producible sealing of the Fuel injection valve to the outside, for example compared to a fuel rail, a distribution line or a Intake manifold or a cylinder head, is guaranteed.
  • the Sealing is carried out by sealing elements according to the invention in a plastic injection mold before or together with or after the plastic injection of the fuel injector are generated.
  • a plastic injection molding of the valve jacket a second Spraying process, in which the sealing elements on the Injection molded plastic that at least one flat contact area is formed.
  • the sealing elements on the Injection molded plastic is a Before closing.
  • the formation of the sealing elements by means of injection molding very flexible design and spatial arrangement be made.
  • the thicknesses and widths (axial Extension lengths) of the sealing elements can be easily varied.
  • a large variety of shapes is easy to manufacture, being curved, rounded or flat outer contours as well contours provided with sealing lips or sealing ribs are appropriate.
  • Embodiments of sealing elements on one Fuel injector according to the invention are in the Drawing shown in simplified form and in the following Description explained in more detail.
  • 1 shows it Fuel injector with various sealing elements
  • Figure 2 shows a sealing element with a plurality of sealing lips, the however only for better illustration of the geometry than separate component is shown.
  • FIG. 1 shows fuel injector according to the invention for Fuel injection systems from mixture-compressing, spark-ignited internal combustion engines has a one-piece, surrounded by a magnetic coil 1, as an inner pole and as Fuel inlet or flow as well as a valve seat support serving largely tubular metal base body 2.
  • the base body 2 is designed several times and provides largely a valve housing of the fuel injector
  • the magnet coil 1 is of at least one, For example, two designed as a bracket and as Guiding element serving ferromagnetic elements or Guide elements 6 surround.
  • Each guide element 6 surrounds the Magnetic coil 1 in the circumferential direction partially and is with one end each above and below the magnet coil 1 on the base body 2 by welding, soldering or gluing connectable.
  • the base body 2 has an inner, concentric to one Valve longitudinal axis 10 extending longitudinal opening 11, which in an upstream area 11a as Fuel flow channel and in a downstream Area 11b additionally at least partially as Guide opening for one along the valve longitudinal axis 10 axially movable valve needle 12 is used.
  • the area 11b points a larger diameter than the area 11a there in axial extent of the solenoid 1 Step 13 is provided in the longitudinal opening 11.
  • the base body 2 has a thin-walled magnetic Throttle point 16.
  • Valve seat body 14 At the downstream end of the region 11b of the longitudinal opening 11 of the base body 2 serving as valve seat support is a Valve seat body 14 introduced, which is a fixed Has valve seat surface 15 as a valve seat.
  • the Valve seat body 14 is for example by means of of a laser generated weld with the base body 2 connected. Otherwise, the lower region 11b is used Longitudinal opening 11 of the receptacle of the valve needle 12 by an armature 17 and a spherical valve closing body 18 is formed.
  • On the downstream face of the Valve seat body 14 is a flat spray orifice plate 20 arranged.
  • the armature 17 serving as the closing body carrier is at its downstream, the spray orifice plate 20th facing end with the spherical valve closing body 18, for example, firmly connected by a weld.
  • the injection valve is actuated in a known manner Way electromagnetic.
  • a return spring 25 or closing the injection valve serves the electromagnetic circuit with the magnetic coil 1, the inner base body 2, the guide elements 6 and the anchor 17.
  • the anchor 17 is accordingly on the step paragraph 13th of the base body 2 aligned.
  • the return spring 25 extends in the longitudinal opening 11, for example, both downstream and upstream of the step 13, thus in both areas 11a and 11b.
  • the spherical valve closing body 18 interacts with the tapered in the direction of flow Valve seat surface 15 of the valve seat body 14 together, the in the axial direction downstream of a guide opening in Valve seat body 14 is formed.
  • the spray hole disc 20 has at least one, for example four through Eroding or stamping shaped injection openings 27.
  • the one end position is the Valve needle 12 when the solenoid 1 is not energized by the Contact of the valve closing body 18 on the valve seat surface 15 of the valve seat body 14 set while the other end position of the valve needle 12 when excited Magnetic coil 1 by the installation of the armature 17 on the Step 13 of the base body 2 results.
  • the Stroke adjustment takes place by axially shifting the Valve seat body 14, which corresponds to the desired Position subsequently firmly connected to the base body 2 becomes.
  • Adjustment sleeve 29 is used to adjust the spring preload the return spring 25 resting on the adjusting sleeve 29, the one with its opposite side Bottom region 30 of an inner depression 31 in armature 17 supports, also an adjustment of the dynamic Sprayed amount with the adjusting sleeve 29 takes place.
  • the Anchor 17 Starting from the bottom region 30 of the recess 31 is in the Anchor 17 at least one through opening 35, for example, two or four through openings 35 formed, which is inclined to the valve axis 10 to the outside extend. Tapered in the area of the through openings 35 the armature 17 in the downstream direction, the The outer contour is frustoconical. This training of Armature 17 enables the valve seat surface 15 fuel to be supplied first through the recess 31 inside and after exiting the through openings 35 can flow freely outside the valve needle 12.
  • the fuel injector is largely with a Plastic encapsulation 38 enclosed, which is in axial Direction almost completely over the base body 2 and thereby also extends the guide elements 6.
  • a Plastic extrusion 38 is one example co-molded electrical connector 39, in which e.g. two contact pins 40 starting from the magnetic coil 1 end up.
  • the electrical connector 39 takes place electrical contacting of the magnetic coil 1 and thus its Excitement.
  • sealing elements 45, 45a-d are provided, which none represent independently mountable sealing components. Rather, these sealing elements 45 precede or immediately after or after attaching the Plastic injection molded 38. For one The procedure requires a two-substance spraying technique.
  • a particularly preferred procedure is as follows described in more detail.
  • a second spraying process with the same tool made in which the sealing elements 45 are generated.
  • the Plastic extrusion 38 already has a certain stability and Have dimensional accuracy, the plastic still one Softness has an optimal cohesion with the Material of the desired sealing elements 45 is made.
  • Materials for the sealing elements 45 are particularly suitable different types of rubber (elastomers) or elastic Plastics such as already from O-rings or others Sealing rings on injection valves are known.
  • Especially advantageous way in the training of Sealing elements 45 are very flexible by means of injection molding Shape design and spatial arrangement can be made.
  • FIG. 1 there are several on the fuel injector Examples regarding the shape and arrangement of the Sealing elements 45 shown with additional Letters from a to d are marked. It can be both only a single sealing element 45 on the fuel injector be provided; but several can according to the invention molded sealing elements 45 on and same fuel injector. This can vary depending on the installation conditions become.
  • the sealing element 45a at the inlet-side upper end the plastic encapsulation 38 is such molded that it is on the one hand with a flat inside 47 rests directly on the base body 2 and on the other hand with a curved outside 48 for sealing against one other component (e.g. fuel rail) is ready. With a The underside 49 also has the sealing element 45a direct surface contact with an upper end face 52 the plastic encapsulation 38.
  • sealing element 45 is on spray-side end of the plastic encapsulation 38 shown, in which the sealing element 45d directly on the Plastic extrusion 38, in one for it provided step section 55 is sprayed.
  • the Sealing element 45d now lies with the flat inside 47 the plastic encapsulation 38, while the at least partially curved outside 48 for sealing against another component (e.g. intake manifold).
  • a flat, flat top 50 is the sealing element 45d also directly on a shoulder 56 of the Step section 55 of the plastic encapsulation 38. in the In contrast to the sealing element 45a, the sealing element 45d that is, two contact surfaces with the plastic encapsulation 38 on.
  • Sealing element 45 on the circumference of the fuel injector and specifically on the circumference of the plastic encapsulation 38 Two more options for training one Sealing element 45 on the circumference of the fuel injector and specifically on the circumference of the plastic encapsulation 38 are shown with the sealing elements 45b and 45c.
  • ring grooves 58 are provided, in which the Sealing elements 45b and 45c are injected.
  • This Ring grooves 58 are located in the central part of the axial Extension of the plastic encapsulation 38, e.g. in the Extension range of the magnetic coil 1 or the adjusting sleeve 29. At least on the groove bottom of the ring grooves 58 is a flat, cohesive contact of the inner sides 47 of the Sealing elements 45 with the plastic encapsulation 38.
  • the Outside 48 of the sealing elements 45 can be curved (Sealing element 45b) or rather flat with roundings in the Edge areas (sealing element 45c) or completely flat be executed. As shown in Figure 1, the thicknesses are as well as the widths (axial extension lengths) of the Sealing elements 45 easily variable.
  • middle sealing elements 45b and 45c has the advantage of a very large variability the installation position with one and the same Fuel injector. Without changes in Valve group (e.g. on base body 2 or on the valve needle 12) can, for example, at any time with such a valve a further injection point implemented if necessary be placed further into the intake manifold is pushed into it. The intake pipe-side seal is then, for example, instead of the sealing element 45d Sealing element 45c taken over. Since the sealing elements 45 very simply be formed with different thicknesses can, it is possible despite different Valve outer diameter (e.g. largest diameter in the area the magnet coil 1, smallest diameter in the range of Valve closing body 18) various sealing elements 45b, 45c, 45d for sealing against the opening of a To use suction pipe socket with constant diameter.
  • Valve outer diameter e.g. largest diameter in the area the magnet coil 1, smallest diameter in the range of Valve closing body 18
  • the sealing elements 45 can also have different contours than that in FIG have shown the figure 1. So can the Outside 48 of the sealing elements 45, for example, several Sealing lips 60 or sealing ribs may be provided, as is the case sealing element 45 shown in FIG. 2 can be removed. The individual sealing lips 60 run on the outer circumference of the Sealing element 45, for example, in a ring shape. It should be noted that the sealing element 45 only for better clarification of its geometry than separate, from the plastic extrusion 38 shown separated component is, but not according to the invention as independent mountable sealing component is present.

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

Claims (8)

  1. Injecteur pour des installations d'injection de carburant de moteurs à combustion interne, comportant un axe longitudinal, un boítier d'injecteur recevant une aiguille mobile axialement ainsi qu'un organe d'obturation coopérant avec un siège de soupape fixe pour ouvrir et fermer l'injecteur (soupape), avec une surinjection de matière plastique entourant au moins partiellement le boítier de l'injecteur, et avec des éléments d'étanchéité pour assurer l'étanchéité de l'injecteur par rapport à l'extérieur,
    caractérisé en ce qu'
    au moins l'un des éléments d'étanchéité (45) présente un contact de surface et de matière avec la surinjection de matière plastique (38), et cet élément au moins unique d'étanchéité (45) et la surinjection plastique (38) sont injectés l'un sur l'autre.
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    les éléments d'étanchéité (45) sont en élastomère.
  3. Injecteur selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    les éléments d'étanchéité (45) ont chaque fois un côté extérieur (48) non tourné vers l'axe longitudinal (10) de l'injecteur, et ce côté extérieur est au moins partiellement bombé.
  4. Injecteur selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce qu'
    au moins l'un des éléments d'étanchéité (45a) est injecté sur la surinjection de matière plastique (38) de façon que seulement le côté supérieur (50) de l'élément d'étanchéité (45) ou seulement le côté inférieur (49) de l'élément d'étanchéité (45a) qui est essentiellement perpendiculaire à l'un des côtés intérieurs (47) tourné vers l'axe (10) de l'injecteur, possède un contact de surface avec la surinjection de matière plastique (38).
  5. Injecteur selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    l'un des éléments d'étanchéité (45b, 45c) est injecté dans une rainure annulaire (58) périphérique, autour de la surinjection de matière plastique (38), de façon qu'au moins un côté intérieur (47) de l'élément d'étanchéité (45b, 45c) tourné vers l'axe longitudinal (10) de l'injecteur, possède un contact de surface avec la surinjection de matière (38).
  6. Injecteur selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce qu'
    au moins l'un des éléments d'étanchéité (45d) est intégré dans un segment en gradin (55) de la surinjection de matière plastique (38), de façon qu'au moins deux côtés de l'élément d'étanchéité (45d) présentent un contact de surface avec la surinjection de matière plastique (38).
  7. Injecteur selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce qu'
    au moins un élément d'étanchéité (45) possède un côté extérieur (48) non tourné vers l'axe longitudinal (10) de l'injecteur et ce côté extérieur comporte plusieurs lèvres d'étanchéité (60).
  8. Injecteur selon la revendication 7,
    caractérisé en ce que
    les lèvres d'étanchéité (60) entourent de manière annulaire le côté extérieur (48) de l'élément d'étanchéité (45).
EP98940057A 1997-09-06 1998-06-26 Injecteur de carburant Expired - Lifetime EP0937202B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19739150 1997-09-06
DE19739150A DE19739150A1 (de) 1997-09-06 1997-09-06 Brennstoffeinspritzventil
PCT/DE1998/001757 WO1999013213A1 (fr) 1997-09-06 1998-06-26 Injecteur de carburant

Publications (2)

Publication Number Publication Date
EP0937202A1 EP0937202A1 (fr) 1999-08-25
EP0937202B1 true EP0937202B1 (fr) 2002-03-20

Family

ID=7841496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98940057A Expired - Lifetime EP0937202B1 (fr) 1997-09-06 1998-06-26 Injecteur de carburant

Country Status (5)

Country Link
US (1) US6076802A (fr)
EP (1) EP0937202B1 (fr)
JP (1) JP4083244B2 (fr)
DE (2) DE19739150A1 (fr)
WO (1) WO1999013213A1 (fr)

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DE19739150A1 (de) 1999-03-11
DE59803427D1 (de) 2002-04-25
JP4083244B2 (ja) 2008-04-30
EP0937202A1 (fr) 1999-08-25
JP2001504916A (ja) 2001-04-10
WO1999013213A1 (fr) 1999-03-18
US6076802A (en) 2000-06-20

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