EP0446201B1 - Fuel injection nozzle for internal combustion engines - Google Patents

Fuel injection nozzle for internal combustion engines Download PDF

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Publication number
EP0446201B1
EP0446201B1 EP89905052A EP89905052A EP0446201B1 EP 0446201 B1 EP0446201 B1 EP 0446201B1 EP 89905052 A EP89905052 A EP 89905052A EP 89905052 A EP89905052 A EP 89905052A EP 0446201 B1 EP0446201 B1 EP 0446201B1
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EP
European Patent Office
Prior art keywords
coil
injection nozzle
holder
short
nozzle 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.)
Expired - Lifetime
Application number
EP89905052A
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German (de)
French (fr)
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EP0446201A1 (en
Inventor
Karl Hofmann
Roland Zucker
Bernhard Kaczynski
Ursula Schoedel
Alfred Knauer
Ulrich Lessing
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Priority to AT89905052T priority Critical patent/ATE79160T1/en
Publication of EP0446201A1 publication Critical patent/EP0446201A1/en
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Publication of EP0446201B1 publication Critical patent/EP0446201B1/en
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    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a fuel injection nozzle according to the preamble of the main claim.
  • the chamber receiving the closing spring in the nozzle holder is connected to a leakage oil connection via a channel which is passed through the magnet armature, the coil core in the induction coil, the wire guide body and the installation channel of the needle movement sensor.
  • the coil winding of the induction coil is not sealed against the leakage oil passage, so that the coil winding must be made resistant to the fuel.
  • the coil core on the side facing away from the closing spring is extended beyond the connection points of the coil winding with the connecting wires and the yoke body is also pulled axially over these connection points.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the coil winding of the induction coil is properly sealed with respect to the chamber accommodating the closing spring in the nozzle holder, without requiring more space in the axial direction of the injection nozzle than in the known arrangement.
  • the additional space required for accommodating the two sealing rings is saved again in that the coil core is also moved into this space and therefore the needle movement sensor in the area of the connection points of the coil winding with the connecting wires can be designed without obstruction by the coil core.
  • a particularly compact design is obtained if the coil body is provided with an annular collar which projects into the elongated section of the chamber in the yoke body and bears tightly against the protruding end of the coil core and carries the sealing ring.
  • the installation channel for the needle movement sensor can be designed with a particularly small diameter and without an enlarged diameter overlap to the bore of the nozzle holder receiving the return body, if the bore intended for receiving the wire guide body in the coil former with its lateral recesses receiving the connection points with the coil winding is connected via channels, the openings of which lie closer together in the receiving bore than the openings of which open into the recesses.
  • a particularly dense and durable design results if the induction coil is fixed in its mounting hole in the rear-firing body by an injected plastic, preferably silicone, without gaps and shake-proof, which preferably also fills the cavities in the area of the electrical connections in wire guide bodies without gaps.
  • an injected plastic preferably silicone
  • the production can be simplified and the space available for a leak oil hole and a filter hole in the nozzle holder can be expanded if, according to a further proposal of the invention, the end sections of the two connecting wires of the induction coil which protrude from the wire guide body are led out of the nozzle holder next to one another in an isolated insulating plug.
  • a secure connection of the internal connection wires with the individual wires of a connection cable is obtained if the insulating plug carries two metallic solder sleeves to which both the internal connection wires and the individual wires of the connection cable are soldered.
  • a good anchoring of the individual wires of the connection cable on the nozzle holder and a safe strain relief of the electrical connections result if, according to the invention, the end sections of the individual wires of the connection cable are guided through grooves in the jacket region of the nozzle holder and are fixed in them by subsequent deformation of at least one groove wall area.
  • all of the depressions provided for receiving the electrical connecting means in the jacket region of the nozzle holder are injection-molded with plastic, which fixes the parts on the nozzle holder without gaps and insulates and protects them from the outside.
  • the plastic can form a sleeve surrounding the nozzle holder, which has the same outer diameter as the nozzle holder and also encompasses the end region of the connecting cable so as to hold and give direction.
  • FIG. 1 shows an injection nozzle according to the first exemplary embodiment, partly in a side view and partly in a longitudinal section
  • FIG. 2 shows a longitudinal section, enlarged compared to FIG. 1, through the needle displacement sensor of the injection nozzle along the line II-II in FIG. 1
  • FIG. 3 shows the coil former of the injection nozzle according to FIG. 1 in side view and partly in section
  • FIG. 4 is a plan view of the coil former
  • FIG. 5 shows the coil former in a side view rotated by 90 ° with respect to FIG. 3 and partly in section (line VV in FIG. 3, FIG.
  • FIG. 6 shows a section along the line VI-VI in Figure 5
  • Figure 7 seen the wire guide body of the injection nozzle according to Figure 1 in longitudinal section
  • Figure 8 is an end view of the wire guide body in the direction of arrow A in Figure 7.
  • Figure 9 shows a longitudinal section through an injection nozzle according to the second embodiment
  • Fig. 10 the detail "X" of Figure 9 on an enlarged scale
  • Fig. 11 shows a section na On the line XI-XI in FIG. 9 and FIG. 12, a section along the line XII-XII in FIG. 11.
  • nozzle 1 has a nozzle holder 10 against which an intermediate plate 12 and a nozzle body 14 are clamped by a union nut 16.
  • a valve needle 18 is slidably mounted, on which a closing spring 22 acts via a pressure piece 20 and is accommodated in a spring chamber 21 of the nozzle holder 10.
  • the closing spring 22 is supported on the nozzle holder 10 via a magnetically conductive yoke body 25, the construction and double function of which is described below in more detail.
  • the valve needle 18 cooperates with an inward-facing valve seat in the nozzle body 14 and executes its opening stroke against the direction of flow of the fuel.
  • the guide bore of the valve needle 18 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 18 has a pressure shoulder facing the valve seat and which has a fuel via channels (not shown) in the nozzle body 14, in the intermediate disk 12 and in the nozzle holder 10.
  • Connection piece 26 of the nozzle holder 10 is connected.
  • the fuel pressure acting on the pressure shoulder of the valve needle 18 pushes the valve needle 18 upward against the force of the closing spring 22 until an invisible shoulder on the valve needle 18 abuts the lower end face of the intermediate disk 12 and limits the further upward stroke of the valve needle 14.
  • a needle movement sensor designated as a whole by reference number 28, is installed in the nozzle holder 10 and can be connected to an evaluation circuit of a control device for the fuel supply or a test device.
  • the needle motion sensor 28 consists of an induction coil 30 with coil winding 32 and coil body 34, a coil core 36, a bolt-shaped magnet armature 38, the yoke body 25 serving as a supporting body for the closing spring 22 and two connecting wires 40, 42 which are passed through a wire guide body 44.
  • the parts of the needle displacement sensor 28 are described in more detail below.
  • the coil former 34 is designed as a plastic injection-molded part, into which the coil core 36 consisting of soft iron is molded.
  • the coil former 34 has two ring flanges 46, 48 which delimit a first cylindrical section 50 which carries the coil winding 32.
  • At the bottom of the ring flange 46 there is an annular collar 52 with a thickened collar edge 54, which in the installed state is covered by a sealing ring 56.
  • the coil core 36 is provided with an end section 58 which projects beyond the ring flange 46 and is tightly enclosed by the ring collar 52 and which has a conical blind bore 60 into which a correspondingly conical end section of the bolt-shaped magnet armature 38 is immersed.
  • a clamping flange 62 is integrally formed on the coil core 36 and is divided into two segments 66 by two diametrically opposite radial cutouts 64.
  • the clamping flange 62 has a larger outer diameter than the ring flanges 46, 48 of the coil body 34, which is formed through the recesses 64 of the clamping flange 62 with two webs 68 and continues above the clamping flange 62 as a cylindrical body in its basic shape.
  • This body has two segment-shaped recesses 70 which are arranged in such a way that an annular region 72 with the diameter D covering the clamping flange 62 and a section 74 which is approximately rectangular in cross section is formed with parallel side surfaces 76.
  • An oblique groove 78 is formed in each of the webs 68, through which a connection end of the coil winding 32 passes and into the corresponding recess 70.
  • the coil former 34 again forms a fully cylindrical ring section 80 with the diameter D, which merges at a conical ring surface 82 into a cylindrical section 84 with the smaller diameter d.
  • Four sections 86 are formed on the section 84, the lateral surfaces of which extend parallel to the axis of the coil former 34 and lie on an imaginary cylinder with the diameter D.
  • the upper sections of the strips 86 are slightly stepped inwards at 88 and merge into the upper end face 92 of the coil former 34 on an inclined surface 90.
  • the cylindrical section 84 of the coil former 34 is provided with a blind bore 94 extending from its upper end face 92, which is delimited at the bottom by a flat bottom surface 96. From the side, two diametrically opposite wall openings 98 open into the blind bore 94, above which the blind bore 94 is provided with longitudinal groove-like wall recesses 100. A projection 102 protrudes from the bottom surface 96 into the center of the blind bore 94 and from this two channels 104 lead into the lateral recesses 70, which each narrow down like a funnel to a circular bore 106.
  • the induction coil 30 is inserted into a chamber of the yoke body 25, which has a downwardly elongated section 107, which receives the ring collar 52 formed on the bobbin 34 and the sealing ring 56 seated thereon, and to which a guide bore for the bolt-shaped magnet armature 38 connects at the bottom .
  • the coil winding 32 is against the annular gap between the magnet armature 38 and the guide bore in the yoke body 25 through the sealing ring 56 sealed, which is firmly clamped between the bore wall of the elongated portion 107 of the chamber and the annular collar 52 of the bobbin 34.
  • the magnet armature 38 is connected via a rod part 110 (FIG.
  • the yoke body 25 has a sealing ring 112 on its circumference, which seals the annular gap between the yoke body 25 and the wall of the bore 114 in the nozzle holder 10 receiving it.
  • the short-circuit body 25 lies with the interposition of the clamping flange 62 formed on the coil core 36 on an annular shoulder 116 of the nozzle holder 10, at which the bore 114 merges into the inner central section 118 of an installation duct 120, into which two oblique bores 122 lead from the outside.
  • an air gap is formed in the magnetic circuit of the induction coil 30, the size of which changes with the stroke of the valve needle 18.
  • the magnetic circuit is closed in a relatively short way compared to the known arrangement.
  • the coil former 34 protrudes into the central section 118 of the installation channel 120.
  • the lead wires 40, 42 are connected in the region of the lateral recesses 44 in the coil former 34 to the connection ends of the coil winding 32, which, inserted into the slots 78 of the coil former 34, are passed through the recesses 64 of the clamping flange 62.
  • connection ends of the coil winding 32 can be provided with an excess length for the purpose of additional strain relief or to facilitate connection, which forms a loop or the like in the cutouts 70.
  • the actual strain relief is achieved in that the connecting wires 40, 42 are firmly anchored in the wire guide body 44 and this is locked in place with the coil body 34.
  • the wire guide body 44 is provided with two axial bores 124, in which the connecting wires 40, 42 which are passed through are glued or held in some other way, e.g. B. are pressed or molded.
  • the bores 124 are arranged in a cylindrical section 126 of the wire guide body 44, the diameter of which corresponds to that of the blind bore 90 in the coil body 34 and on which two diametrically opposed locking lugs 128 are formed, which are inserted into the side wall openings when the wire guide body 44 is inserted into the coil body 34 98 click into place.
  • the cylindrical section 126 is provided with a central depression 130 for the suitable accommodation of the projection 102 on the coil former 34.
  • the cylindrical section 126 is adjoined by an approach 132 which is approximately rectangular in cross section and which fits between the two connecting wires 40, 42 and holds them apart in an insulating manner.
  • the connecting wires 40, 42 are surrounded by insulated sleeves 134 which are plugged on and pressed into the bores 122 or, if appropriate, glued in, and which reach inside close to the upper end of the wire guide body 44.
  • the spring chamber 24 of the nozzle holder 10 is connected to a leakage oil channel (not visible in the drawing) which bypasses the badel movement sensor 28 laterally and leads into a leakage oil connection 136 fastened to the nozzle holder 10.
  • the bare connecting wires 40, 42 are expediently first passed through the holes 124 in the wire guide body 44 over the prescribed length and fixed in the holes 124. So then the wire guide body 44 with the connecting wires 40, 42 is brought up to the coil body 34 in such a way that the connecting wires 40, 42 enter the channels 104 of the coil body 34.
  • the wire guide body 44 is inserted into the blind bore 94 of the coil body 34, the free ends of the connecting wires 40, 42 are spread apart and directed into the lateral recesses 70 of the coil body 34.
  • the connecting wires 40, 42 get a kink at the output of the wire guide body 44, which results in an additional strain relief effect.
  • the wire ends are relieved of strain on the coil body 34, after which they can be soldered to the connection ends of the coil winding 32.
  • the assembly thus prefabricated is now inserted into the yoke body 25 and inserted together with it from the side of the spring chamber 24 into the nozzle holder 10, the coil body 34 fittingly entering the central section 118 of the installation channel 120 and the connecting wires 40, 42 automatically in find the holes 122 leading to the outside. Then the insulating sleeves 134 are plugged on and fixed in the bores 122.
  • the insulating sleeves 134 themselves have no sealing function, because this is already carried out by the sealing rings 56, 112 and the leakage oil channel bypasses the needle movement sensor 28.
  • the coil body 34 could also be provided with individual knobs or the like on the circumference, which do not make it more difficult to insert it into the installation channel 120, but additionally tension the inserted coil body 34 radially, and thereby the latching connection between it and the wire guide body 44 stiffen.
  • nozzle 9 has essentially the same housing structure as the previously described embodiment, namely a nozzle holder 210 against which an intermediate plate 212 and a nozzle body 210 are clamped by a union nut 216.
  • a valve needle 218 is slidably mounted in the nozzle body 210, but is acted upon by two closing springs 220 and 222 in the manner described below.
  • a needle movement sensor 228 built into the nozzle holder 210 also corresponds to the above-described embodiment with regard to the formation of an induction coil 230 and a wire guide body 244.
  • the induction coil 230 is seated in a yoke body 232 which, in contrast to the embodiment according to FIG. 2, is provided with a sleeve-shaped extension 234 which encloses the one closing spring 220 and extends up to a support disk 236 for the second closing spring 222.
  • the sleeve-shaped extension 234 could also be formed by a component arranged in addition to the yoke body, so that the yoke body can be designed identically to that of the first exemplary embodiment.
  • the first closing spring 220 is supported on the yoke body 232 on the inside and engages the valve needle 218 via a pressure piece 238 and a pressure pin 240.
  • the pressure pin 240 is slidably guided in the support plate 236 and in a bush 242, which in turn is slidably mounted in the intermediate plate 212.
  • the second closing spring 222 presses the bush 242 against the upper end face of the nozzle body 214 at the bottom via a pressure piece 245 and holds the return body 232 together with the induction coil 230 against the housing shoulder 246 of the nozzle holder 210 via the support disk 236.
  • the upper closing spring 220 first acts solely on the valve needle 218 until it hits a lower stroke h 1 against the lower end face of the bush 242. Thereafter, the opening pressure of the fuel must also overcome the closing spring 222 until after a further partial stroke h2 the sleeve 202 abuts a shoulder in the stepped guide bore in the intermediate plate 212.
  • This graduated closing force curve means that pre-injection and main injection are clearly separated in various operating areas.
  • An anchor bolt 247 which is guided in the yoke body 232, is connected in one piece to the pressure piece 238 and dips into the induction coil 230 and generates the desired signals through its movements.
  • a transverse bore 250 is provided in the nozzle holder 210, which leads via a corresponding transverse bore in the yoke body 232 into the receiving chamber for the induction coil 230.
  • silicone is injected into these annular holes between the induction coil 230 and the chamber wall, thereby fixing the induction coil 230 without gaps and without shaking.
  • the Silicone also passes from the annular gap into the cavities of the wire guide body 244 receiving the coil connections (for details see FIGS. 3 to 8) and also fills them without gaps.
  • the transverse bore 250 is sealed off from the outside by a pressed-in ball 252.
  • the injection nozzle according to FIG. 9 also differs from the first exemplary embodiment by a different design of the wire guide upstream of the wire guide body 244 and by a different cable connection.
  • the two connecting wires 254, 256 are not diametrically opposed, but are guided out of the nozzle holder 210 on one side in an insulating plug 258 in an insulated manner. This creates more space for a leak oil hole and a hole for a filter body 260 in the fuel channel and the external cable connection can also be made more easily, secured and covered to the outside. Furthermore, only one hole has to be provided in the nozzle holder 210 for the passage of the connecting wires 254, 256.
  • soldering sleeves 262 are placed next to one another, into which the ends of the connecting wires 254, 256 protruding from the insulating plugs 258 are soldered.
  • the insulating plug 258 is furthermore provided with an upwardly projecting, metallic contact of the soldering sleeves 262 with the nozzle holder 210 preventing insulating wall 264, and with an insulating web which engages between the soldering sleeves 262 and cannot be seen in the drawing.
  • the insulating plug 258 also has a conical section 266 which, by the measures described below, is pressed tightly against a correspondingly conical section of the bore in the nozzle holder 210 receiving the insulating plug 258.
  • An electrical connection cable 270 contains two individual wires 272, 274, one above the other, provided with an insulating sheath, which, according to FIG. 11, are looped around the nozzle holder 210 to the soldering sleeves 262.
  • Each individual wire 272, 274 is passed through an axially accessible groove 276, 278 which extends over part of the circumference of the casing of the nozzle holder 210 in a recessed casing area of the nozzle holder 210 and is fixed in the groove by flanging the outer groove wall 280.
  • the bare ends of the individual wires 272, 274 are soldered into the soldering sleeves 262.
  • a plastic overmolding 282 applied in a last operation encircles the nozzle holder 210 and the adjacent end region of the connecting cable 270 in a cuff-like manner such that the end region is held at right angles to the nozzle axis.
  • the plastic encapsulation 282 forms an additional fixation of the individual wires 272, 274 and also fills the cavities formed between the parts in the recess 261 of the nozzle holder 210 without any gaps, the insulating plug 258 also being pressed tightly into its installation bore by the injection pressure.
  • an annular groove 284 is provided which surrounds the insulating plug 258 with a small radial distance. The plastic penetrating into the annular groove 284 during the encapsulation shrinks on cooling and thus exerts an additional radial sealing force on the insulating plug 258.

Abstract

An injection nozzle fitted with an inductive needle movement probe (28) is to be so constructed that the coil (32) is properly sealed against oil leaks without requiring more space than a design without an oil seal for the coil (32). To this end, the core (36) of the induction coil (30) is extended into a lengthened section (107) of the chamber in the recoil body (25) enclosing the induction coil (30) in which is fitted a ring (56) sealing the coil (32) against the guide slot of the magnet armature (38) in the recoil body (25). In addition, the annular slot between the recoil body (25) and the wall of the drilling in the nozzle holder (10) enclosing it is sealed by a ring (112). The clamping flange (62) linked to the coil core (36) bears directly on the adjacent annular flange (48) of the coil body (34) and the coil (32) makes contact with the connecting wires (40, 42) on the far side of the clamping flange (62). Preferred field of application is in injection nozzles for diesel engines.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzdüse nach der Gattung des Hauptanspruchs. Bei bekannten Einspritzdüsen dieser Gattung (DE-A 35 15 264) ist die die Schließfeder aufnehmende Kammer im Düsenhalter mit einem Leckölanschluß über einen Kanal verbunden, der durch den Magnetanker, den Spulenkern in der Induktionsspule, den Drahtführungskörper und den Installationskanal des Nadelbewegungsfühlers hindurchgeführt ist. Bei dieser Ausführung ist die Spulenwicklung der Induktionsspule gegen die Lecköldurchführung nicht abgedichtet, so daß die Spulenwicklung gegen den Kraftstoff beständig ausgeführt sein muß. Darüberhinaus ist der Spulenkern auf der von der Schließfeder abgekehrten Seite über die Verbindungsstellen der Spulenwicklung mit den Anschlußdrähten hinaus verlängert und auch der Rückschlußkörper ist in axialer Richtung über diese Verbindungsstellen hinweggezogen. Dadurch ergibt sich ein verhältnismäßig großer Platzbedarf in axialer und radialer Richtung, wobei zum Abstützen der Schließfeder über den Rückschlußkörper und den Einspannflansch des Spulenkerns nur eine verhältnismäßig schmale Ringfläche am Düsenhalter verfügbar ist. Wollte man bei dieser Ausführung die Spulenwicklung gegen die Lecköldurchführung abdichten, würde man für den Nadelbewegungsfühler in Achsrichtung der Einspritzdüse noch weiteren Platz benötigen.The invention relates to a fuel injection nozzle according to the preamble of the main claim. In known injection nozzles of this type (DE-A 35 15 264) the chamber receiving the closing spring in the nozzle holder is connected to a leakage oil connection via a channel which is passed through the magnet armature, the coil core in the induction coil, the wire guide body and the installation channel of the needle movement sensor. In this embodiment, the coil winding of the induction coil is not sealed against the leakage oil passage, so that the coil winding must be made resistant to the fuel. In addition, the coil core on the side facing away from the closing spring is extended beyond the connection points of the coil winding with the connecting wires and the yoke body is also pulled axially over these connection points. This results in a relatively large amount of space in the axial and radial directions, and to support the closing spring on the yoke body and Clamping flange of the coil core only a relatively narrow ring area is available on the nozzle holder. If you wanted to seal the coil winding against the leakage oil feedthrough in this version, additional space would be required for the needle movement sensor in the axial direction of the injection nozzle.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß die Spulenwicklung der Induktionsspule gegenüber der die Schließfeder aufnehmenden Kammer im Düsenhalter einwandfrei abgedichtet ist, ohne daß in Achsrichtung der Einspritzdüse mehr Platz als bei der bekannten Anordnung beansprucht wird. Der für die Unterbringung der beiden Dichtringe benötigte zusätzliche Raum wird dadurch wieder eingespart, daß auch der Spulenkern in diesen Raum hineinversetzt ist und daher der Nadelbewegungsfühler im Bereich der Verbindungsstellen der Spulenwicklung mit den Anschlußdrähten ohne Behinderung durch den Spulenkern gestaltet werden kann.The arrangement according to the invention with the characterizing features of the main claim has the advantage that the coil winding of the induction coil is properly sealed with respect to the chamber accommodating the closing spring in the nozzle holder, without requiring more space in the axial direction of the injection nozzle than in the known arrangement. The additional space required for accommodating the two sealing rings is saved again in that the coil core is also moved into this space and therefore the needle movement sensor in the area of the connection points of the coil winding with the connecting wires can be designed without obstruction by the coil core.

Durch die in den Unteransprüchen enthaltenen Maßnahmen sind vorteilhafte Weiterbildungen der Anordnung nach Patentanspruch 1 möglich.The measures contained in the subclaims allow advantageous further developments of the arrangement according to claim 1.

Eine besonders gedrängte Ausführung ergibt sich, wenn der Spulenkörper mit einem in den verlängerten Abschnitt der Kammer im Rückschlußkörper hineinragenden, am vorstehenden Ende des Spulenkerns dicht anliegenden Ringkragen versehen ist, der den Dichtring trägt.A particularly compact design is obtained if the coil body is provided with an annular collar which projects into the elongated section of the chamber in the yoke body and bears tightly against the protruding end of the coil core and carries the sealing ring.

Der Einbau des Nadelwegungsfühlers samt den mit der Spulenwicklung bereits verbundenen Anschlußdrähten in den Düsenhalter wird erleichtert, wenn der Drahtführungskörper mit dem Spulenkörper verrastet ist.The installation of the needle path sensor together with the connecting wires already connected to the coil winding in the nozzle holder is facilitated if the wire guide body is locked in place with the coil body.

Eine einfache Zugentlastung bei gleichzeitiger Erleichterung der Montage ergibt sich, wenn die Anschlußdrähte in Bohrungen des Drahtführungskörpers fest verankert sind. Beim Fügen der Teile werden die Anschlußdrähte am Ausgang des Drahtführungskörpers seitlich abgeknickt, wodurch sich eine zusätzliche Zugentlastungswirkung ergibt.A simple strain relief with simultaneous ease of assembly is obtained if the connecting wires are firmly anchored in the bores of the wire guide body. When joining the parts, the connecting wires at the outlet of the wire guide body are bent laterally, which results in an additional strain relief effect.

Der Installationskanal für den Nadelbewegungsfühler kann mit einem besonders geringen Durchmesser und ohne einen im Durchmesser vergrößerten Übergangsüberschnitt zu der den Rückschlußkörper aufnehmenden Bohrung des. Düsenhalters ausgeführt sein, wenn die zur Aufnahme des Drahtführungskörpers bestimmte Bohrung im Spulenkörper mit dessen die Verbindungsstellen mit der Spulenwicklung aufnehmenden seitlichen Ausnehmungen über Kanäle verbunden ist, deren Ausmündungen in die Aufnahmebohrung enger beieinanderliegen als deren Ausmündungen in die Ausnehmungen. In diesem Fall ergibt sich eine nicht unwesentlich breitere Stützfläche für die Schließfederkraft als bei der bekannten Ausführung, wodurch die ursprüngliche Einstellung des Öffnungdruckes der Einspritzdüse länger erhalten bleibt.The installation channel for the needle movement sensor can be designed with a particularly small diameter and without an enlarged diameter overlap to the bore of the nozzle holder receiving the return body, if the bore intended for receiving the wire guide body in the coil former with its lateral recesses receiving the connection points with the coil winding is connected via channels, the openings of which lie closer together in the receiving bore than the openings of which open into the recesses. In this case, there is a not insignificantly wider support surface for the closing spring force than in the known embodiment, as a result of which the original setting of the opening pressure of the injection nozzle is retained for a longer time.

Eine besonders dichte und haltbare Ausführung ergibt sich, wenn die Induktionsspule in Ihrer Einbaübohrung im Rückschtußkörper durch einen eingespritzten Kunststoff, vorzugsweise Silikon, spaltfrei und schüttelsicher festgelegt ist, der vorzugsweise auch die Hohlräume im Bereich der elektrischen Anschlüsse in Drahtführungskörper spaltfrei ausfüllt.A particularly dense and durable design results if the induction coil is fixed in its mounting hole in the rear-firing body by an injected plastic, preferably silicone, without gaps and shake-proof, which preferably also fills the cavities in the area of the electrical connections in wire guide bodies without gaps.

Die Fertigung kann vereinfacht und das Platzangebot für eine Leckölbohrung und eine Filterbohrung im Düsenhalter kann erweitert werden, wenn gemäß einem weiteren Vorschlag der Erfindung die aus dem Drahtfürungskörper herausragenden Endabschnitte der beiden Anschlußdrähte der Induktionsspule in einem einzigen Isolierstopfen isoliert nebeneinanderliegend aus dem Düsenhalter herausgeführt sind.The production can be simplified and the space available for a leak oil hole and a filter hole in the nozzle holder can be expanded if, according to a further proposal of the invention, the end sections of the two connecting wires of the induction coil which protrude from the wire guide body are led out of the nozzle holder next to one another in an isolated insulating plug.

Eine sichere Verbindung der internen Anschlußdrähte mit den einzelnen Drähten eines Anschlußkabels ergibt sich, wenn der Isolierstopfen zwei metallische Lötmuffen trägt, an welche sowohl die internen Anschlußdrähte als auch die Einzeldrähte des Anschlußkabels angelötet sind.A secure connection of the internal connection wires with the individual wires of a connection cable is obtained if the insulating plug carries two metallic solder sleeves to which both the internal connection wires and the individual wires of the connection cable are soldered.

Eine gute Verankerung der Einzeldrähte des Anschlußkabels am Düsenhalter und eine sichere Zugentlastung der elektrischen Verbindungen ergibt sich, wenn erfindungsgemäß die Endabschnitte der Einzeldrähte des Anschlußkabels durch Nuten im Mantelbereich des Düsenhalters hindurchgeführt und in diesen durch nachträgliches Verformen mindestens eines Nutwandbereichs festgelegt sind.A good anchoring of the individual wires of the connection cable on the nozzle holder and a safe strain relief of the electrical connections result if, according to the invention, the end sections of the individual wires of the connection cable are guided through grooves in the jacket region of the nozzle holder and are fixed in them by subsequent deformation of at least one groove wall area.

Besonders vorteilhaft ist es, wenn alle zur Aufnahme der elektrischen Verbindungsmittel im Mantelbereich des Düsenhalters vorgesehenen Vertiefungen mit Kunststoff ausgespritzt sind, der die Teile spaltfrei am Düsenhalter festlegt und nach außen isoliert und schützend überdeckt. Der Kunststoff kann eine den Düsenhalter umgebende Manschette bilden, die den gleichen Außendurchmesser wie der Düsenhalter aufweist und auch den Endbereich des Anschlußkabels halt- und richtunggebend umgreift.It is particularly advantageous if all of the depressions provided for receiving the electrical connecting means in the jacket region of the nozzle holder are injection-molded with plastic, which fixes the parts on the nozzle holder without gaps and insulates and protects them from the outside. The plastic can form a sleeve surrounding the nozzle holder, which has the same outer diameter as the nozzle holder and also encompasses the end region of the connecting cable so as to hold and give direction.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Einspritzdüse nach dem ersten Ausführungsbeispiel teilweise in Seitenansicht und teilweise im Längsschnitt, Figur 2 einen gegenüber Figur 1 vergrößerten Längsschnitt durch den Nadelwegungsfühler der Einspritzdüse nach der Linie II-II in Figur 1, Figur 3 den Spulenkörper der Einspritzdüse nach Figur 1 in Seitenansicht und teilweise im Schnitt, Figur 4 eine Draufsicht auf den Spulenkörper, Figur 5 den Spulenkörper in einer gegenüber Figur 3 um 90° gedrehten Seitenansicht und teilweise im Schnitt (Linie V-V in Figur 3, Figur 6 einen Schnitt nach der Linie VI-VI in Figur 5, Figur 7 den Drahtführungskörper der Einspritzdüse nach Figur 1 im Längsschnitt und Figur 8 eine Stirnansicht des Drahtfürungskörpers in Richtung des Pfeiles A in Figur 7 gesehen. Ferner zeigen Fig. 9 einen Längsschnitt durch eine Einspritzdüse gemäß dem zweiten Ausführungsbeispiel, Fig. 10 die Einzelheit "X" der Figur 9 in vergrößertem Maßstab, Fig. 11 einen Schnitt nach der Linie XI-XI in Fig. 9 und Fig. 12 einen Schnitt nach der Linie XII-XII in Fig. 11.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows an injection nozzle according to the first exemplary embodiment, partly in a side view and partly in a longitudinal section, FIG. 2 shows a longitudinal section, enlarged compared to FIG. 1, through the needle displacement sensor of the injection nozzle along the line II-II in FIG. 1, and FIG. 3 shows the coil former of the injection nozzle according to FIG. 1 in side view and partly in section, FIG. 4 is a plan view of the coil former, FIG. 5 shows the coil former in a side view rotated by 90 ° with respect to FIG. 3 and partly in section (line VV in FIG. 3, FIG. 6 shows a section along the line VI-VI in Figure 5, Figure 7 seen the wire guide body of the injection nozzle according to Figure 1 in longitudinal section and Figure 8 is an end view of the wire guide body in the direction of arrow A in Figure 7. Furthermore, Figure 9 shows a longitudinal section through an injection nozzle according to the second embodiment, Fig. 10 the detail "X" of Figure 9 on an enlarged scale, Fig. 11 shows a section na On the line XI-XI in FIG. 9 and FIG. 12, a section along the line XII-XII in FIG. 11.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Einspritzdüse nach Fig. 1 hat einen Düsenhalter 10, gegen den eine Zwischenplatte 12 und ein Düsenkörper 14 durch eine Überwurfmutter 16 gespannt sind. Im Düsenkörper 14 ist eine Ventilnadel 18 verschiebbar gelagert, auf welche über ein Druckstück 20 eine Schließfeder 22 einwirkt, die in einer Federkammer 21 des Düsenhalters 10 untergebracht ist. Die Schließfeder 22 stützt sich am Düsenhalter 10 über einen magnetisch leitenden Rückschlußkörper 25 ab, dessen Aufbau und Doppelfunktion nachstehend noch näher baschrieben ist.1 has a nozzle holder 10 against which an intermediate plate 12 and a nozzle body 14 are clamped by a union nut 16. In the nozzle body 14, a valve needle 18 is slidably mounted, on which a closing spring 22 acts via a pressure piece 20 and is accommodated in a spring chamber 21 of the nozzle holder 10. The closing spring 22 is supported on the nozzle holder 10 via a magnetically conductive yoke body 25, the construction and double function of which is described below in more detail.

Die Ventilnadel 18 arbeitet mit einem nach innen gekehrten Ventilsitz im Düsenkörper 14 zusammen und führt ihren Öffnungshüb entgegen der Strömungsrichtung des Kraftstoffs aus. Die Führungsbohrung der Ventilnadel 18 ist wie üblich an einer Stelle zu einem Druckraum erweitert, in dessen Bereich die Ventilnadel 18 eine dem Ventilsitz zugekehrte Druckschulter hat und der über nicht dargestellte Kanäle im Düsenkörper 14, in der Zwischenscheibe 12 und dem Düsenhalter 10 mit einem Kraftstoff-Anschlußstutzen 26 des Düsenhalters 10 verbunden ist. Der an der Druckschulter der Ventilnadel 18 angreifende Kraftstoffdruck schiebt die Ventilnadel 18 entgegen der Kraft der Schließfeder 22 nach ober, bis eine nicht sichtbare Schulter an der Ventilnadel 18 gegen die untere Stirnseite der Zwischenscheibe 12 stößt und den weiteren Aufwärtshub der Ventilnadel 14 begrenzt.The valve needle 18 cooperates with an inward-facing valve seat in the nozzle body 14 and executes its opening stroke against the direction of flow of the fuel. The guide bore of the valve needle 18 is, as usual, expanded at one point to a pressure chamber, in the area of which the valve needle 18 has a pressure shoulder facing the valve seat and which has a fuel via channels (not shown) in the nozzle body 14, in the intermediate disk 12 and in the nozzle holder 10. Connection piece 26 of the nozzle holder 10 is connected. The fuel pressure acting on the pressure shoulder of the valve needle 18 pushes the valve needle 18 upward against the force of the closing spring 22 until an invisible shoulder on the valve needle 18 abuts the lower end face of the intermediate disk 12 and limits the further upward stroke of the valve needle 14.

Im Düsenhalter 10 ist ein als Ganzes mit der Bezugszahl 28 bezeichneter Nadelbewegungsfühler eingebaut, der an eine Auswerteschaltung eines Steuergerätes für die Kraftstoffzuführ oder eines Testgerätes anschließbar ist. Der Nadelbewegungsfühler 28 besteht aus einer Induktionsspule 30 mit Spulenwicklung 32 und Spulenkörper 34, einem Spulenkern 36, einem bolzenförmigen Magnetanker 38, dem als Stützkörper für die Schließfeder 22 dienenden Rückschlußkörper 25 und zwei Anschlußdrähten 40, 42 die durch einen Drahtführungskörper 44 hindurchgeführt sind. Im Folgenden sind die angeführten Teile des Nadelwegungsfühlers 28 näher beschrieben.A needle movement sensor, designated as a whole by reference number 28, is installed in the nozzle holder 10 and can be connected to an evaluation circuit of a control device for the fuel supply or a test device. The needle motion sensor 28 consists of an induction coil 30 with coil winding 32 and coil body 34, a coil core 36, a bolt-shaped magnet armature 38, the yoke body 25 serving as a supporting body for the closing spring 22 and two connecting wires 40, 42 which are passed through a wire guide body 44. The parts of the needle displacement sensor 28 are described in more detail below.

Der Spulenkörper 34 ist als Kunststoff-Spritzteil ausgeführt, in welches der aus Weicheisen bestehende Spulenkern 36 eingeformt ist. Der Spulenkörper 34 hat zwei Ringflansche 46, 48, die einen ersten zylindrischen Abschnitt 50 begrenzen, der die Spulenwicklung 32 trägt. An den Ringflansch 46 schließt sich Dach unten ein Ringkragen 52 mit einem verdickten Kragenrand 54 an, der im eingebauten Zustand von einem Dichtring 56 umspannt ist. Der Spulenkern 36 ist mit einem über den Ringflansch 46 vorstehenden, vom Ringkragen 52 dicht umschlossenen Endabschnitt 58 versehen, der eine konische Sackbohrung 60 hat, in die ein entsprechend konisch ausgeführter Endabschnitt des bolzenförmigen Magnetankers 38 eintaucht.The coil former 34 is designed as a plastic injection-molded part, into which the coil core 36 consisting of soft iron is molded. The coil former 34 has two ring flanges 46, 48 which delimit a first cylindrical section 50 which carries the coil winding 32. At the bottom of the ring flange 46 there is an annular collar 52 with a thickened collar edge 54, which in the installed state is covered by a sealing ring 56. The coil core 36 is provided with an end section 58 which projects beyond the ring flange 46 and is tightly enclosed by the ring collar 52 and which has a conical blind bore 60 into which a correspondingly conical end section of the bolt-shaped magnet armature 38 is immersed.

Am oberen Ende ist an den Spulenkern 36 ein Einspannflansch 62 einstückig angeformt, der durch zwei sich diametral gegenüberliegende radiale Aussparungen 64 in zwei Segmente 66 geteilt ist. Der Einspannflansch 62 hat einen größeren Außendurchmesser als die Ringflansche 46, 48 des Spulenkörpers 34, welcher durch die Aussparungen 64 des Einspannflansches 62 mit zwei Stegen 68 hindurchgeformt ist und sich oberhalb des Einspannflansches 62 als ein in seiner Grundform zylindrischer Körper fortsetzt. Dieser Körper weist zwei segmentförmige Aussparungen 70 auf, die so angeordnet sind, daß ein den Einspannflansch 62 überdeckender Ringbereich 72 mit dem Durchmesser D und ein im Querschnitt etwa rechteckiger Abschnitt 74 mit parallelen Seitenflächen 76 gebildet ist. In die Stege 68 ist je eine schräglaufende Nut 78 eingeformt, durch die je ein Anschlußende der Spulenwicklung 32 hindurch- und in die entsprechende Aussparung 70 hineingeführt ist.At the upper end, a clamping flange 62 is integrally formed on the coil core 36 and is divided into two segments 66 by two diametrically opposite radial cutouts 64. The clamping flange 62 has a larger outer diameter than the ring flanges 46, 48 of the coil body 34, which is formed through the recesses 64 of the clamping flange 62 with two webs 68 and continues above the clamping flange 62 as a cylindrical body in its basic shape. This body has two segment-shaped recesses 70 which are arranged in such a way that an annular region 72 with the diameter D covering the clamping flange 62 and a section 74 which is approximately rectangular in cross section is formed with parallel side surfaces 76. An oblique groove 78 is formed in each of the webs 68, through which a connection end of the coil winding 32 passes and into the corresponding recess 70.

Oberhalb der Aussparungen 70 bildet der Spulenkörper 34 wieder einen vollzylindrischen Ringabschnitt 80 mit dem Durchmesser D, der an einer konischen Ringfläche 82 in einen zylindrischen Abschnitt 84 mit dem kleineren Durchmesser d übergeht. An den Abschnitt 84 sind außen vier in Umfangsrichtung je um 90° versetzte Leisten 86 angeformt, deren parallel zur Achse des Spulenkörpers 34 verlaufende Mantelflächen auf einem gedachten Zylinder mit dem Durchmesser D liegen. Die oberen Abschnitte der Leisten 86 sind bei 88 leicht nach innen abgestuft und gehen an einer Schrägfläche 90 in die obere Stirnseite 92 des Spulenkörpers 34 über.Above the cutouts 70, the coil former 34 again forms a fully cylindrical ring section 80 with the diameter D, which merges at a conical ring surface 82 into a cylindrical section 84 with the smaller diameter d. Four sections 86, each offset by 90 ° in the circumferential direction, are formed on the section 84, the lateral surfaces of which extend parallel to the axis of the coil former 34 and lie on an imaginary cylinder with the diameter D. The upper sections of the strips 86 are slightly stepped inwards at 88 and merge into the upper end face 92 of the coil former 34 on an inclined surface 90.

Der zylindrische Abschnitt 84 des Spulenkörpers 34 ist mit einer von seiner oberen Stirnseite 92 ausgehenden Sackbohrung 94 versehen, welche unten durch eine ebene Bodenfläche 96 begrenzt ist. In die Sackbohrung 94 münden von der Seite her zwei sich diametral gegenüberliegende Wanddurchbrüche 98 ein, oberhalb deren die Sackbohrung 94 mit längsnutartigen Wandvertiefungen 100 versehen ist. Von der Bodenfläche 96 ragt ein Vorsprung 102 mittig in die Sackbohrung 94 hinein und von dieser führen zwei Kanäle 104 in die seitlichen Aussparungen 70, welche sich trichterartig nach unten je zu einer kreisrunden Bohrung 106 verengen.The cylindrical section 84 of the coil former 34 is provided with a blind bore 94 extending from its upper end face 92, which is delimited at the bottom by a flat bottom surface 96. From the side, two diametrically opposite wall openings 98 open into the blind bore 94, above which the blind bore 94 is provided with longitudinal groove-like wall recesses 100. A projection 102 protrudes from the bottom surface 96 into the center of the blind bore 94 and from this two channels 104 lead into the lateral recesses 70, which each narrow down like a funnel to a circular bore 106.

Die Induktionsspule 30 ist in eine Kammer des Rückschlußkörpers 25 eingesetzt, die einen nach unten verlängerten Abschnitt 107 hat, der den am Spulenkörper 34 gebildeten Ringkragen 52 und den darauf sitzenden Dichtring 56 aufnimmt und an den sich nach unten eine Führungsbohrung für den bolzenförmigen Magnetanker 38 anschließt. Die Spulenwicklung 32 ist gegen den Ringspalt zwischen Magnetanker 38 und Führungsbohrung im Rückschlußkörper 25 durch den Dichtring 56 abgedichtet, der zwischen der Bohrungswand des verlängerten Abschnittes 107 der Kammer und dem Ringkragen 52 des Spulenkörpers 34 fest eingespannt ist. Der Magnetanker 38 ist über einen Stangenteil 110 (Figur 1) mit dem Druckstück 20 verbunden, über welches die Schließfeder 22 auf die Ventinadel 18 einwirkt. Der Rückschlußkörper 25 trägt am Umfang einen Dichtring 112, der den Ringspalt zwischen dem Rückschlußkörper 25 und der Wand der ihn aufnehmenden Bohrung 114 im Düsenhalter 10 abdichtet.The induction coil 30 is inserted into a chamber of the yoke body 25, which has a downwardly elongated section 107, which receives the ring collar 52 formed on the bobbin 34 and the sealing ring 56 seated thereon, and to which a guide bore for the bolt-shaped magnet armature 38 connects at the bottom . The coil winding 32 is against the annular gap between the magnet armature 38 and the guide bore in the yoke body 25 through the sealing ring 56 sealed, which is firmly clamped between the bore wall of the elongated portion 107 of the chamber and the annular collar 52 of the bobbin 34. The magnet armature 38 is connected via a rod part 110 (FIG. 1) to the pressure piece 20, via which the closing spring 22 acts on the valve needle 18. The yoke body 25 has a sealing ring 112 on its circumference, which seals the annular gap between the yoke body 25 and the wall of the bore 114 in the nozzle holder 10 receiving it.

Der Rückschlußkörper 25 liegt unter Zwischenschaltung des am Spulenkern 36 gebildeten Einspannflansches 62 an einer Ringschulter 116 des Düsenhalters 10 an, an welcher die Bohrung 114 in den inneren zentralen Abschnitt 118 eines Installationskanales 120 übergeht, in den von außen her zwei schräge Bohrungen 122 hineinführen. Zwischen dem konischen Endabschnitt des Magnetankers 38 und der Wand der konischen Sackbohrung 60 im Spulenkern 36 ist ein Luftspalt im magnetischen Kreis der Induktionsspule 30 gebildet, dessen Größe sich mit dem Hub der Ventilnadel 18 ändert. Über den Rückschlußkörper 25 und den Einspannflansch 62 ist der magnetische Kreis auf einem gegenüber der bekannten Anordnung verhältnismäßig kurzen Weg geschlossen.The short-circuit body 25 lies with the interposition of the clamping flange 62 formed on the coil core 36 on an annular shoulder 116 of the nozzle holder 10, at which the bore 114 merges into the inner central section 118 of an installation duct 120, into which two oblique bores 122 lead from the outside. Between the conical end section of the magnet armature 38 and the wall of the conical blind bore 60 in the coil core 36, an air gap is formed in the magnetic circuit of the induction coil 30, the size of which changes with the stroke of the valve needle 18. About the yoke body 25 and the clamping flange 62, the magnetic circuit is closed in a relatively short way compared to the known arrangement.

Der Spulenkörper 34 ragt passend in den zentralen Abschnitt 118 des Installationskanales 120 hinein. Die Leitungsdrähte 40, 42 sind im Bereich der seitlichen Aussparungen 44 im Spulenkörper 34 mit den Anschlußenden der Spulenwicklung 32 verbunden, die, in die Nuten 78 des Spulenkörpers 34 eingelegt, durch die Aussparungen 64 des Einspannflansches 62 hindurchgeführt sind.The coil former 34 protrudes into the central section 118 of the installation channel 120. The lead wires 40, 42 are connected in the region of the lateral recesses 44 in the coil former 34 to the connection ends of the coil winding 32, which, inserted into the slots 78 of the coil former 34, are passed through the recesses 64 of the clamping flange 62.

Im Bereich der Aussparungen 70 des Spulenkörpers 34 können die Anschlußenden der Spulenwicklung 32 zum Zweck einer zusätzlichen Zugentlastung bzw. zur Erleichterung des Anschließens mit einer Überlänge versehen sein, welche in den Aussparungen 70 eine Schlaufe oder dergl. bildet. Die eigentliche Zugentlastung wird dadurch erreicht, dem die Anschlußdrähte 40, 42 im Drahtführungskörper 44 fest verankert sind und dieser mit dem Spulenkörper 34 verrastet ist. Der Drahtführungskörper 44 ist zu diesem Zweck mit zwei axialen Bohrungen 124 versehen, in welchen die passend hindurchgeführten Anschlußdrähte 40, 42 festgeklebt oder auf andere Weise festgehalten, z. B. eingepreßt oder umspritzt sind.In the area of the cutouts 70 of the coil body 34, the connection ends of the coil winding 32 can be provided with an excess length for the purpose of additional strain relief or to facilitate connection, which forms a loop or the like in the cutouts 70. The actual strain relief is achieved in that the connecting wires 40, 42 are firmly anchored in the wire guide body 44 and this is locked in place with the coil body 34. For this purpose, the wire guide body 44 is provided with two axial bores 124, in which the connecting wires 40, 42 which are passed through are glued or held in some other way, e.g. B. are pressed or molded.

Die Bohrungen 124 sind in einem zylindrischen Abschnitt 126 des Drahtführungskörpers 44 angeordaet, dessen Durchmesser jenem der Sackbohrung 90 im Spulenkörper 34 entspricht und an welchem zwei sich diametral gegenüberliegende Rastnasen 128 gebildet sind, die beim Einstecken des Drahtführungskörpers 44 in den Spulenkörper 34 in dessen seitliche Wanddurchbrüche 98 einrasten. Im unteren Bereich ist der zylindrische Abschnitt 126 mit einer zentralen Vertiefung 130 zur passenden Aufnahme des Vorsprungs 102 am Spulenkörper 34 versehen. An den zylindrischen Abschnitt 126 schließt sich ein im Querschnitt etwa rechteckigförmiger Ansatz 132 an, der passend zwischen die beiden Anschlußdrähte 40, 42 greift und diese isolierend auseinander hält. In den Bohrungen 122 des Düsenhalters 10 sind die Anschlußdrähte 40, 42 von aufgesteckten und in die Bohrungen 122 eingedrückten bzw. gegebenenfalls eingeklebten Isoliertüllen 134 umgeben, die innen bis nahe an das obere Ende des Drahtführungskörpers 44 heranreichen.The bores 124 are arranged in a cylindrical section 126 of the wire guide body 44, the diameter of which corresponds to that of the blind bore 90 in the coil body 34 and on which two diametrically opposed locking lugs 128 are formed, which are inserted into the side wall openings when the wire guide body 44 is inserted into the coil body 34 98 click into place. In the lower region, the cylindrical section 126 is provided with a central depression 130 for the suitable accommodation of the projection 102 on the coil former 34. The cylindrical section 126 is adjoined by an approach 132 which is approximately rectangular in cross section and which fits between the two connecting wires 40, 42 and holds them apart in an insulating manner. In the bores 122 of the nozzle holder 10, the connecting wires 40, 42 are surrounded by insulated sleeves 134 which are plugged on and pressed into the bores 122 or, if appropriate, glued in, and which reach inside close to the upper end of the wire guide body 44.

Die Federkammer 24 des Düsenhalters 10 ist mit einem in der Zeichnung nicht sichtbaren Leckölkanal verbunden, der den Badelbewegungsfühler 28 seitlich umgeht und in einem am Düsenhalter 10 befestigten Leckölanschluß 136 führt.The spring chamber 24 of the nozzle holder 10 is connected to a leakage oil channel (not visible in the drawing) which bypasses the badel movement sensor 28 laterally and leads into a leakage oil connection 136 fastened to the nozzle holder 10.

Beim Einbau des Nadelbewegungsfühlers 28 in den Düsenhalter 10 werden zweckmäßig zunächst die blanken Anschlußdrähte 40, 42 durch die Bohrungen 124 im Drahtführungskörper 44 über die vorschriftsmäßige Länge hindurchgeführt und in den Bohrungen 124 festgelegt. So dann wird der Drahtführungskörper 44 mit den Anschlußdrähten 40, 42 voran so an den Spulenkörper 34 herangeführt, daß die Anschlußdrähte 40, 42 in die Kanäle 104 des Spulenkörpers 34 gelangen. Beim Einstecken des Drahtführungskörpers 44 in die Sackbohrung 94 des Spulenkörpers 34 werden die freien Enden der Anschlußdrähte 40, 42 auseinandergespreizt und in die seitlichen Aussparungen 70 des Spulenkörper 34 hineingelenkt. Durch das Auseinanderspreizen erhalten die Anschlußdrähte 40, 42 am Ausgang des Drahtführungskörpers 44 einen Knick, wodurch sich eine zusätzliche Zugentlastungswirkung ergibt. Nach dem Einrasten des Drähtführungskörpers 44 im Spulenkörper 34 liegen die Drahtenden zugentlastet am Spulenkörper 34 fest, wonach sie mit den Anschlußenden der Spulenwicklung 32 verlötet werden können.When installing the needle movement sensor 28 in the nozzle holder 10, the bare connecting wires 40, 42 are expediently first passed through the holes 124 in the wire guide body 44 over the prescribed length and fixed in the holes 124. So then the wire guide body 44 with the connecting wires 40, 42 is brought up to the coil body 34 in such a way that the connecting wires 40, 42 enter the channels 104 of the coil body 34. When the wire guide body 44 is inserted into the blind bore 94 of the coil body 34, the free ends of the connecting wires 40, 42 are spread apart and directed into the lateral recesses 70 of the coil body 34. By spreading apart, the connecting wires 40, 42 get a kink at the output of the wire guide body 44, which results in an additional strain relief effect. After the wire guide body 44 has snapped into place in the coil body 34, the wire ends are relieved of strain on the coil body 34, after which they can be soldered to the connection ends of the coil winding 32.

Die so vorgefertigte Baueinheit wird nunmehr in den Rückschlußkörper 25 eingesteckt und zusammen mit diesem von der Seite der Federkammer 24 her in den Düsenhalter 10 eingesetzt, wobei der Spulenkörper 34 passend in den zentralen Abschnitt 118 des Installationskanals 120 eintritt und die Anschlußdrähte 40, 42 selbsttätig in die nach außen führenden Bohrungen 122 hineinfinden. Anschließend werden noch die Isoliertüllen 134 aufgesteckt und in den Bohrungen 122 festgelegt.The assembly thus prefabricated is now inserted into the yoke body 25 and inserted together with it from the side of the spring chamber 24 into the nozzle holder 10, the coil body 34 fittingly entering the central section 118 of the installation channel 120 and the connecting wires 40, 42 automatically in find the holes 122 leading to the outside. Then the insulating sleeves 134 are plugged on and fixed in the bores 122.

Die Isoliertüllen 134 haben selbst keine Abdichtfunktion, weil diese bereits durch die Dichtringe 56, 112 ausgeübt wird und der Leckölkanal den Nadelbewegungsfühler 28 umgeht.The insulating sleeves 134 themselves have no sealing function, because this is already carried out by the sealing rings 56, 112 and the leakage oil channel bypasses the needle movement sensor 28.

Der Spulenkörper 34 könnte an seinen oberen Abschnitten 80, 84 auch mit einzelnen Noppen oder dergl. am Umfang versehen sein, welche das Einschieben in den Installationskanal 120 nicht erschweren, den eingeschobenen Spulenkörper 34 jedoch zusätzlich radial verspannen und dadurch die Rastverbindung zwischen ihm und dem Drahtführungskörper 44 versteifen.At its upper sections 80, 84, the coil body 34 could also be provided with individual knobs or the like on the circumference, which do not make it more difficult to insert it into the installation channel 120, but additionally tension the inserted coil body 34 radially, and thereby the latching connection between it and the wire guide body 44 stiffen.

Die Einspritzdüse nach Fig. 9 hat im wesentlichen den gleichen Gehäuseaufbau wie das vorher beschriebene Ausführungsbeispiel, nämlich einen Düsenhalter 210, gegen den eine Zwischenplatte 212 und ein Düsenkörper 210 durch eine Überwurfmutter 216 gespannt sind. Im Düsenkörper 210 ist eine Ventilnadel 218 verschiebbar gelagert, auf die jedoch zwei Schließfedern 220 und 222 in der nachfolgend beschriebenen Weise einwirken. ferner stimmt auch ein in den Düsenhalter 210 eingebauter Nadelbewegungsfühler 228 bezüglich der Ausbildung einer Induktionsspule 230 und eines Drahtführungskörpers 244 mit der vorbeschriebenen Ausführung überein.9 has essentially the same housing structure as the previously described embodiment, namely a nozzle holder 210 against which an intermediate plate 212 and a nozzle body 210 are clamped by a union nut 216. A valve needle 218 is slidably mounted in the nozzle body 210, but is acted upon by two closing springs 220 and 222 in the manner described below. furthermore, a needle movement sensor 228 built into the nozzle holder 210 also corresponds to the above-described embodiment with regard to the formation of an induction coil 230 and a wire guide body 244.

Die Induktionsspule 230 sitzt in einem Rückschlußkörper 232, der abweichend von der Ausführung nach Figur 2 mit einem hülsenförmigen Ansatz 234 versehen ist, welcher die eine Schließfeder 220 umschließt und bis zu einer Stützscheibe 236 für die zweite Schließfeder 222 reicht. Der hülsenförmige Ansatz 234 könnte auch durch ein zusätzlich zum Rückschlußkörper angeordnetes Bauteil gebildet sein, so daß der Rückschlußkörper identisch mit jenem des ersten Ausführungsbeispiels ausgebildet sein kann. Die erste Schließfeder 220 stützt sich am Rückschlußkörper 232 innen ab und greift über ein Druckstück 238 und einen Druckbolzen 240 an der Ventilnadel 218 an. Der Druckbolzen 240 ist in der Stützscheibe 236 und in einer Buchse 242 verschiebbar geführt, die ihrerseits in der Zwischenplatte 212 verschiebbar gelagert ist. Die zweite Schließfeder 222 drückt unten über ein Druckstück 245 die Buchse 242 gegen dir obere Stirnseite des Düsenkörpers 214 und hält oberen über die Stützscheibe 236 den Rückschlußkörper 232 samt Induktionsspule 230 an einer Gehäuseschulter 246 des Düsenhalters 210 angelegt.The induction coil 230 is seated in a yoke body 232 which, in contrast to the embodiment according to FIG. 2, is provided with a sleeve-shaped extension 234 which encloses the one closing spring 220 and extends up to a support disk 236 for the second closing spring 222. The sleeve-shaped extension 234 could also be formed by a component arranged in addition to the yoke body, so that the yoke body can be designed identically to that of the first exemplary embodiment. The first closing spring 220 is supported on the yoke body 232 on the inside and engages the valve needle 218 via a pressure piece 238 and a pressure pin 240. The pressure pin 240 is slidably guided in the support plate 236 and in a bush 242, which in turn is slidably mounted in the intermediate plate 212. The second closing spring 222 presses the bush 242 against the upper end face of the nozzle body 214 at the bottom via a pressure piece 245 and holds the return body 232 together with the induction coil 230 against the housing shoulder 246 of the nozzle holder 210 via the support disk 236.

Beim Öffnungshüb der Ventilnadel 218 wirkt zunächst die obere Schließfeder 220 allein auf die Ventilnadel 218 ein, bis diese nach Zurücklegung eines Vorhübes h₁ an die untere Stirnseite der Buchse 242 anstößt. Danach muß der Öffnungsdruck des Kraftstoffs auch die Schließfeder 222 überwinden, bis nach einem weiteren Teilhüb h₂ die Buchse 202 an einer Schulter in der abgestuften Führungsbohrung in der Zwischenplatte 212 anstößt. Durch diesen abgestuften Schließkraftverlauf wird in verschiedenen Betriebsbereichen eine deutliche Absetzung von Vor- und Haupteinspritzung erreicht. Mit dem Druckstück 238 ist einstückig ein im Rückschlußkörper 232 geführter Ankerbolzen 247 verbunden, der in die Induktionsspule 230 eintaucht und durch seine Bewegungen die gewünschten Signale erzeugt.At the opening stroke of the valve needle 218, the upper closing spring 220 first acts solely on the valve needle 218 until it hits a lower stroke h 1 against the lower end face of the bush 242. Thereafter, the opening pressure of the fuel must also overcome the closing spring 222 until after a further partial stroke h₂ the sleeve 202 abuts a shoulder in the stepped guide bore in the intermediate plate 212. This graduated closing force curve means that pre-injection and main injection are clearly separated in various operating areas. An anchor bolt 247, which is guided in the yoke body 232, is connected in one piece to the pressure piece 238 and dips into the induction coil 230 and generates the desired signals through its movements.

In Höhe der Induktionsspule 230 ist im Düsenhalter 210 eine Querbohrung 250 vorgesehen, die über eine korrespondierende Querbohrung im Rückschlußkörper 232 in die Aufnahmekammer für die Induktionsspule 230 führt. Über diese Querbohrungen wird nach der Montage des Nadelbewegungsfühlers 228 Silikon in den Ringspalt zwischen der Induktionsspule 230 und der Kammerwand gespritzt und dadurch die Induktionsspule 230 spaltfrei und schüttelsicher festgelegt. Das Silikon gelangt vom Ringspalt auch in die die Spulenanschlüsse aufnehmenden Hohlräume des Drahtführungskörpers 244 (Einzelheiten siehe Figuren 3 bis 8) und füllt diese ebenfalls spaltfrei aus. Nach dem Einfüllen des Silikons wird die Querbohrung 250 durch eine eingepreßte Kugel 252 nach außen dicht verschlossen.At the level of the induction coil 230, a transverse bore 250 is provided in the nozzle holder 210, which leads via a corresponding transverse bore in the yoke body 232 into the receiving chamber for the induction coil 230. After the assembly of the needle movement sensor 228, silicone is injected into these annular holes between the induction coil 230 and the chamber wall, thereby fixing the induction coil 230 without gaps and without shaking. The Silicone also passes from the annular gap into the cavities of the wire guide body 244 receiving the coil connections (for details see FIGS. 3 to 8) and also fills them without gaps. After the silicone has been filled in, the transverse bore 250 is sealed off from the outside by a pressed-in ball 252.

Neben der abweichenden Schließfederanordnung und der zusätzlichen Pestlegung der Induktionsspule 230 sowie dem Ausgießen der Hohlräume im Dratführungskörper 244 mit Silikon unterscheidet sich die Einspritzdüse nach Figur 9 vom ersten Ausfürungsbeispiel auch durch eine andere Ausbildung der Drahtführung stromauf des Drahtführungskörpers 244 und durch einen anderen Kabelanschluß. Die beiden Anschlußdrähte 254, 256 sind beim zweiten Ausführungsbeispiel nicht diametral gegenüberliegend, sondern isoliert nebeneinander liegend in einem Isolierstopfen 258 einseitig aus dem Düsenhalter 210 herausgeführt. Dadurch ist für eine Leckölbohrung und eine Bohrung für einen Filterkörper 260 im Kraftstoffkanal mehr Raum geschaffen und auch der externe Kabelanschluß kann leichter hergestellt, gesichert und nach außen abgedeckt werden. Ferner muß nur eine Bohrung im Düsenhalter 210 für das Durchführen der Anschlußdrähte 254, 256 vorgesehen werden.In addition to the deviating closing spring arrangement and the additional pesting of the induction coil 230 and the pouring of the cavities in the wire guide body 244 with silicone, the injection nozzle according to FIG. 9 also differs from the first exemplary embodiment by a different design of the wire guide upstream of the wire guide body 244 and by a different cable connection. In the second exemplary embodiment, the two connecting wires 254, 256 are not diametrically opposed, but are guided out of the nozzle holder 210 on one side in an insulating plug 258 in an insulated manner. This creates more space for a leak oil hole and a hole for a filter body 260 in the fuel channel and the external cable connection can also be made more easily, secured and covered to the outside. Furthermore, only one hole has to be provided in the nozzle holder 210 for the passage of the connecting wires 254, 256.

Auf den in einer Vertiefung 261 im Mantelbereich des Düsenhalters 210 nach außen ausmündenden Isolierstopfen 258 sind zwei Lötmuffen 262 nebeneinander aufgesteckt, in welche die aus den Isolierstopfen 258 herausragenden Enden der Anschlußdrähte 254, 256 eingelötet sind. Der Isolierstopfen 258 ist ferner mit einer nach oben abstehenden, eine metallische Berührung der Lötmuffen 262 mit dem Düsenhalter 210 verhindernden Isolierwand 264, sowie mit einem zwischen die Lötmuffen 262 greifenden, in der Zeichnung nicht erkennbaren Isoliersteg versehen.On the insulating plugs 258 which open outward in a recess 261 in the jacket region of the nozzle holder 210, two soldering sleeves 262 are placed next to one another, into which the ends of the connecting wires 254, 256 protruding from the insulating plugs 258 are soldered. The insulating plug 258 is furthermore provided with an upwardly projecting, metallic contact of the soldering sleeves 262 with the nozzle holder 210 preventing insulating wall 264, and with an insulating web which engages between the soldering sleeves 262 and cannot be seen in the drawing.

Der Isolierstopfen 258 hat ferner eine konischen Abschnitt 266, der durch die nachstehend beschriebenen Maßnahmen dicht gegen einen entsprechend konisch ausgebildeten Abschnitt der den Isolierstopfen 258 aufnehmenden Bohrung im Düsenhalter 210 gepreßt ist.The insulating plug 258 also has a conical section 266 which, by the measures described below, is pressed tightly against a correspondingly conical section of the bore in the nozzle holder 210 receiving the insulating plug 258.

Ein elektrisches Anschlußkabel 270 enthält zwei übereinanderliegende, mit einer isolierenden Umhüllung versehene Einzeldrähte 272, 274, die gemäß Fig. 11 den Düsenhalter 210 umschlingend zu den Lötmuffen 262 geführt sind. Jeder Einzeldraht 272, 274 ist durch eine axial zugängliche, sich über Teil des Mantelumfanges des Düsenhalters 210 erstreckende Nut 276, 278 in einem vertieften Mantelbereich des Düsenhalters 210 hindurchgeführt und in der Nut durch Umbördeln der äußeren Nutwand 280 festgelegt. Die blanken Enden der Einzeldrähte 272, 274 sind in die Lötmuffen 262 eingelötet.An electrical connection cable 270 contains two individual wires 272, 274, one above the other, provided with an insulating sheath, which, according to FIG. 11, are looped around the nozzle holder 210 to the soldering sleeves 262. Each individual wire 272, 274 is passed through an axially accessible groove 276, 278 which extends over part of the circumference of the casing of the nozzle holder 210 in a recessed casing area of the nozzle holder 210 and is fixed in the groove by flanging the outer groove wall 280. The bare ends of the individual wires 272, 274 are soldered into the soldering sleeves 262.

Eine in einem letzten Arbeitsgang aufgebrachte Kunstoff-Umspritzung 282 umgreift manschettenartig den Düsenhalter 210 und den benachbarten Endbereich des Anschlußkabels 270 so, daß der Endbereich im rechten Winkel zur Düsenachse gehalten ist. Die Kunststoff-Umspritzung 282 bildet eine zusätzliche Fixierung der Einzeldrähte 272, 274 und füllt ferner in der Vertiefung 261 des Düsenhalters 210 die zwischen den Teilen gebildeten Hohlräume spaltfrei aus, wobei auch der Isolierstopfen 258 durch den Spritzdruck dicht in seine Einbaubohrung hineingepreßt wird. Am Grund der Vertiefung 261 ist eine Ringnut 284 vorgesehen, die den Isolierstopfen 258 mit geringem radialen Abstand umgibt. Der beim Umspritzen in die Ringnut 284 eindringende Kunststoff schrumpft beim Abkühlen und übt so eine zusätliche radiale Dichtkraft auf den Isolierstopfen 258 aus.A plastic overmolding 282 applied in a last operation encircles the nozzle holder 210 and the adjacent end region of the connecting cable 270 in a cuff-like manner such that the end region is held at right angles to the nozzle axis. The plastic encapsulation 282 forms an additional fixation of the individual wires 272, 274 and also fills the cavities formed between the parts in the recess 261 of the nozzle holder 210 without any gaps, the insulating plug 258 also being pressed tightly into its installation bore by the injection pressure. At the bottom of the recess 261, an annular groove 284 is provided which surrounds the insulating plug 258 with a small radial distance. The plastic penetrating into the annular groove 284 during the encapsulation shrinks on cooling and thus exerts an additional radial sealing force on the insulating plug 258.

Claims (16)

1. Fuel-injection nozzle for internal-combustion engines, with a nozzle body, in which is formed a valve seat and is guided displaceably a valve needle which is loaded by a closing spring and, in the opposite direction to this, by the fuel pressure and which, during the opening stroke, moves in opposition to the direction of flow of the fuel, and furthermore with a nozzle-holder which receives a needle-movement sensor induction coil equipped with a coil core and a magnetic short-circuit body which surrounds the induction coil and into which is guided a magnet armature moved together with the valve needle and which is held pressed against a shoulder in the nozzle-holder by the closing spring via a clamping flange connected to the coil core, at which shoulder the nozzle-holder bore receiving the short-circuit body merges into a central portion, arranged equiaxially to the induction coil, of an outwardly leading installation channel, into which is inserted a wire-guide body which, interacting with the coil form carrying the coil winding, ensures a relief of tension for the terminals of the coil winding and can be inserted into the nozzle-holder together with the short-circuit body, the induction coil and the connecting wires characterized by the following features:
a) the annular gap between the short-circuit body (25) and the wall of the bore (114) receiving the short-circuit body (25) and located in the nozzle-holder (10) is sealed off by means of a sealing ring (112) which is preferably arranged in an annular groove on the circumference of that portion of the short-circuit body (25) guiding the magnet armature (38);
b) the coil core (36) of the induction coil (30) projects a little way beyond that end face of the coil winding (32) facing the closing spring (22);
c) the chamber receiving the induction coil (30) and located in the short-circuit body (25) is extended beyond that end face of the coil winding (32) facing the closing spring (22);
d) inserted into the extended portion (107) of the chamber receiving the induction coil (30) and located in the short-circuit body (35) is a sealing ring (56) which seals off the induction coil (30) from the guide gap of the magnet armature (38) in the short-circuit body (25), and
e) a chamber (24) which receives the closing spring (22) and is located in the nozzle-holder (10) and into which opens the bore (114) receiving the needle-movement sensor (28) is connected to a leakage-oil connection (136) via a channel in the nozzle-holder (10) bypassing the needle-movement sensor (28) laterally.
2. Injection nozzle according to Claim 1, characterized in that the coil form (34) is equipped with an annular collar (52) which projects into the extended portion (107) of the chamber in the short-circuit body (25) and which bears sealingly against the protruding end of the coil core (36) and carries the sealing ring (56).
3. Injection nozzle according to Claim 1 or 2, characterized in that the clamping flange (62) connected to the coil core (36) bears directly against an annular flange (48) covering the adjacent end face of the coil winding (32) and belonging to the coil form (34), and in that the two connection ends of the coil winding (32) are guided through clearances (64) in the clamping flange (62) and are connected to the connecting wires (40, 42) within lateral recesses (70) in an extension of the coil form (34) reaching into the central portion (118) of the installation channel (120).
4. Injection nozzle according to one of the preceding claims, characterized in that the wire-guide body (44) is interlocked with the coil form (34).
5. Injection nozzle according to Claim 4, characterized in that the wire-guide body (44) is engaged into a receiving bore (94) of the coil form (34).
6. Injection nozzle according to Claim 5, characterized in that the receiving bore (94) in the coil form (34) is connected to the lateral recesses (70) of the latter via channels (104) of which the exits in the receiving bore (94) are located closer to one another than their exits into the recesses (70).
7. Injection nozzle according to one of Claims 4 to 6, characterized in that the connecting wires (40, 42) are anchored firmly in bores (124) of the wire-guide body (44).
8. Injection nozzle according to one of the preceding claims, characterized in that the induction coil (230) is secured in its installation bore in the short-circuit body (232) free of gaps and in a vibration-proof manner by means of an injected plastic, preferably silicone.
9. Injection nozzle according to Claim 8, characterized in that the injected plastic also fills free of gaps the cavities in the region of the electrical terminals in the wire-guide body (244).
10. Injection nozzle according to one of the preceding claims, characterized in that those end portions of the two connecting wires (254, 256) which project from the wire-guide body (244) are guided out of the nozzle-holder (210) lying insulated next to one another in a single insulating plug (258).
11. Injection nozzle according to Claim 10, characterized in that the insulating plug (258) carries two metallic soldering bushes (262), to which both the internal connecting wires (254, 256) and the individual wires (272, 274) of an external junction cable (270) are soldered.
12. Injection nozzle according to Claim 11, characterized in that the end portions of the individual wires (272, 274) of the junction cable (270) are guided through grooves (276, 278) in the outer-surface region of the nozzle-holder (210) and are secured in these as a result of the subsequent deformation of at least one groove-wall region (280).
13. Injection nozzle according to Claim 11 or 12, characterized in that the soldering bushes (262) arranged in a depression (261) in the outer-surface region of the nozzle-holder (210) are equipped with a plastic injection filling (282) securing the electrical connections free of gaps and covering them relative to the outside.
14. Injection nozzle according to Claims 12 and 13, characterized in that the plastic injection filling (282) also covers in a sleeve-like manner and additionally retains those end portions of the individual wires (272, 274) of the junction cable (270) which loop round the nozzle-holder (210).
15. Injection nozzle according to Claim 14, characterized in that the plastic injection filling (282) completely fills the depressions provided for the electrical cable connection in the outer-surface region of the nozzle-holder (210) and also surrounds the adjacent end region of the junction cable (270) so as to ensure good retention and give it a particular direction.
16. Injection nozzle according to one of the preceding claims, the valve needle of which is loaded by two axially successively arranged closing springs to obtain a stepped opening-pressure behaviour, characterized in that the short-circuit body (232) of the needle-movement sensor (228) is equipped with a sleeve-shaped extension (234) or bears against a sleeve-shaped insert which surrounds a closing spring (220) supported on the short-circuit body (232) and which at its downstream end forms a supporting face for the second closing spring (222).
EP89905052A 1988-11-30 1989-05-05 Fuel injection nozzle for internal combustion engines Expired - Lifetime EP0446201B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89905052T ATE79160T1 (en) 1988-11-30 1989-05-05 FUEL INJECTION NOZZLE FOR COMBUSTION ENGINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3840339A DE3840339A1 (en) 1988-11-30 1988-11-30 FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3840339 1988-11-30

Publications (2)

Publication Number Publication Date
EP0446201A1 EP0446201A1 (en) 1991-09-18
EP0446201B1 true EP0446201B1 (en) 1992-08-05

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EP89905052A Expired - Lifetime EP0446201B1 (en) 1988-11-30 1989-05-05 Fuel injection nozzle for internal combustion engines

Country Status (6)

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US (1) US5161742A (en)
EP (1) EP0446201B1 (en)
JP (1) JP2667269B2 (en)
KR (1) KR960003697B1 (en)
DE (2) DE3840339A1 (en)
WO (1) WO1990006439A1 (en)

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DE4005774A1 (en) * 1990-02-23 1991-08-29 Bosch Gmbh Robert IC engine fuel-injection nozzle - has coaxial thrust pins with fingers passing between each other and supporting springs
DE4142996A1 (en) * 1991-12-24 1993-07-01 Bosch Gmbh Robert METHOD FOR MEASURING THE MECHANICAL MOVEMENT OF A SOLENOID VALVE ARMOR, ESPECIALLY ELECTRICALLY CONTROLLED INJECTION SYSTEMS
US6352209B1 (en) 1996-07-08 2002-03-05 Corning Incorporated Gas assisted atomizing devices and methods of making gas-assisted atomizing devices
WO1998001228A2 (en) * 1996-07-08 1998-01-15 Corning Incorporated Rayleigh-breakup atomizing devices and methods of making rayleigh-breakup atomizing devices
BR9710223A (en) 1996-07-08 2000-01-18 Spraychip Systems Atomization device aided by gas.
DE29810989U1 (en) * 1998-06-19 1999-11-04 Bosch Gmbh Robert Current coil
TW200805838A (en) * 2006-07-05 2008-01-16 Ks Terminals Inc Wire connector and method of fabricating the same
JP4529971B2 (en) 2006-12-21 2010-08-25 株式会社デンソー Fuel injection valve
JP5120316B2 (en) 2009-04-03 2013-01-16 株式会社デンソー Fuel injection device
DE102012208075A1 (en) * 2012-05-15 2013-11-21 Man Diesel & Turbo Se Injector for a fuel supply system of an internal combustion engine and fuel supply system
DE102017217903A1 (en) 2017-10-09 2019-04-11 Robert Bosch Gmbh Fuel injector with needle movement sensor

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SU964457A2 (en) * 1978-09-06 1982-10-07 Предприятие П/Я Р-6194 Device for measuring fuel consumption of ic engine
DE3137761A1 (en) * 1981-09-23 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3227989A1 (en) * 1982-07-27 1984-02-02 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
DE3326840A1 (en) * 1983-07-26 1985-02-14 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES
JPS6036772A (en) * 1983-08-10 1985-02-25 Diesel Kiki Co Ltd Fuel injection valve
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US4573349A (en) * 1984-06-28 1986-03-04 International Harvester Company Needle position indicator for a fuel injection nozzle holder
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Also Published As

Publication number Publication date
DE58902006D1 (en) 1992-09-10
KR900702221A (en) 1990-12-06
DE3840339A1 (en) 1990-05-31
KR960003697B1 (en) 1996-03-21
US5161742A (en) 1992-11-10
EP0446201A1 (en) 1991-09-18
WO1990006439A1 (en) 1990-06-14
JP2667269B2 (en) 1997-10-27
JPH04501896A (en) 1992-04-02

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